Substructure with combination materials

Abstract

The invention relates to a window sill substructure in a watertight, open-fronted, trough shape for a building opening, comprising a window sill support profile as the base of the trough, a window support profile as the back wall of the trough, and at least one side element as the side wall(s) of the trough. The side element is firmly and sealedly connected to the window sill support profile and the window support profile. The side element forms a lateral termination above and to the side of the window support profile. The window sill support profile abuts the window support profile at its front and is firmly and sealedly connected to it. The window sill support profile consists primarily of a closed-cell insulating material. The window support profile consists primarily of a moisture-resistant plastic with high compressive strength.The moisture-resistant plastic of the window sill support profile is a recycled PET with a compressive strength of at least 1.15 MPa, preferably at least 2.5 MPa. The compressive strength of the moisture-resistant plastic is higher than the compressive strength of the closed-cell insulation material of the window sill support profile.

Description

[0001] The present invention relates to a window sill substructure in a watertight tub shape that is open at the front for a building opening, which comprises a window sill support profile as the base of the tub shape, a window support profile as the rear wall of the tub shape and at least one side element as the side wall or side walls of the tub shape, wherein the side element is firmly and sealed connected to the window sill support profile and the window support profile and wherein the side element also forms a lateral closure above and to the side next to the window support profile.

[0002] Such a window sill substructure is known from DE 20 2014 008 247 U1. The design described in this document aims to provide improved sealing of the lower corner areas of window frames and wall openings while simultaneously providing good insulation. Particularly in prefabricated house construction, simple solutions that provide effective sealing are sought. Unlike a frame solution, the known sealing device enables the direct lateral connection of the window frame to the building opening. This can significantly reduce installation effort. Furthermore, a second sealing level below the window sill is possible. However, due to the monolithic structure of this design, a somewhat complex manufacturing process is required, which requires improvement.When using XPS (extruded polystyrene foam), it is possible to assemble the uniform base body from various profiles. The sealing surface provided by the side element next to and above the window support profile is particularly important to prevent water from penetrating the adjacent reveal at this critical point.

[0003] Another window sill substructure is known from DE 20 2017 006 577 U1. The construction uses a base wedge made of PET (polyethylene terephthalate) and a window sill connection profile mounted on top. The lateral closure is achieved by a flexible sealing strip, preferably made of EPDM (ethylene propylene diene rubber). The base wedge transfers the load to the lower crossbar of the building opening.

[0004] DE 20 2019 104 202 U1 relates to a window with a window frame inserted into a wall opening and provided with a window sill connection profile. The window comprises an outwardly open, watertight trough, which has an outwardly sloping support made of closed-cell rigid foam for the window sill and two side walls. The trough is screwed to the window sill connection profile using a connecting bar that connects the two side walls and is attached to the front of the support.

[0005] DE 10 2012 212 551 A1 describes an insulation board for window reveals, comprising a board body made of dimensionally stable, heat-insulating foam plastic profile material with a truncated wedge-shaped cross-section. The board body comprises a base side to be attached to the wall surface of the reveal, a sloping side facing away from it, a narrow side facing the window frame, and a narrow side facing the room side and terminating with the interior wall surface around the window opening. A connecting strip with an L-shaped cross-section along the narrow side facing the window frame, with a compression sealing strip located in its L-shaped legs, serves to create an airtight connection between the insulation board and the window reveal. The board body is made of expanded polystyrene with a density between 50 and 70 g / dm³, preferably 60 g / dm³.Alternatively, expanded polyethylene (EPE) or expanded polypropylene (EPP) can be used, or layers of these materials can be combined. To improve vapor diffusion resistance, surface compressive strength, and UV resistance, the panel body can be coated before or after installation with a vapor-tight coating consisting of an acrylic-based emulsion paint with embedded hollow glass microspheres.

[0006] US 2020 / 0270932 A1 relates to a continuous threshold assembly for doors and sidelights. This comprises a threshold body with a vertically extending stop. Rear surfaces of the sidelights and the vertical door frame elements are aligned in the same plane against the stop. Horizontal surfaces serve to support the sidelights and vertical door frame elements. Additionally, threshold covers and seals can be used. End dams form a watertight barrier. The blocks shown in Figure 10 raise the sidelights and ensure alignment with the door frame.

[0007] DE 20 2017 101 034 U1 discloses a window sill mounting element made of several profile parts made of high-density EPS. The mounting element consists of a window element section and a window sill section. The window element section is designed as a projection for supporting the window, while the window sill section serves to support an exterior window sill, for example, made of aluminum sheet.

[0008] US 2007 / 0266663 A1 describes a window seal for sealing the frame of a structure against moisture and / or air. The seal comprises a water-repellent, compressible material having a top surface, a bottom surface, a leading edge, and a trailing edge provided with an upstanding check dam. The top surface slopes downward from the check dam edge to the leading edge. A flexible wicking material is also provided, partially attached to the top surface of the compressible material and extending beyond the leading edge. The wicking material has an adhesive-coated underside covered by a removable release liner.

[0009] The object of the present invention is to provide a window sill substructure which is further improved and adapted to the various functions to be fulfilled.

[0010] This object is achieved by a window sill substructure according to claim 1. For this purpose, in a generic window sill substructure, it is provided that the window sill support profile adjoins the window support profile on the front side and is firmly and sealed connected to it, that the window sill support profile consists primarily of a closed-cell insulating material and the window support profile consists primarily of a moisture-resistant plastic with a high compressive strength, wherein the moisture-resistant plastic of the window support profile is a recycled PET with a compressive strength of at least 1.15 MPa, preferably of at least 2.5 MPa, and wherein the compressive strength of the moisture-resistant plastic is higher than the compressive strength of the closed-cell insulating material of the window sill support profile.

[0011] The window sill substructure according to the invention preferably forms a prefabricated shaped body prepared for immediate installation in a building opening, which has three main elements, namely the window sill support profile, the window support profile, and at least one side element. The construction is placed on the lower crossbar of the building opening and preferably enables direct connection to the facade insulation. At the same time, the lower corner areas of the building opening are sealed due to the trough shape, and a second sealing level is formed below the window sill to be installed. Advantageously, the window sill substructure is already adapted to the width of the building opening. However, it is certainly possible to assemble standardized corner elements and center pieces of different lengths to form a window sill substructure of a predetermined length within the framework of a modular system.The corner elements and the center pieces are then firmly and tightly connected to each other. Preferably, the window sill support profile and the window support profile are directly adjacent to each other, without the interposition of additional structural elements separating the profiles, in particular without a connecting web as in DE 20 2019 104 202 U1. The window support profile transfers the window's support load directly to the lower crossbar of the building opening, while the window sill support profile essentially only has to bear the load of the window sill.

[0012] The advantage of this inventive design lies in the fact that an insulating material is used for the window sill support profile which, due to its closed-cell structure, fulfills the necessary properties for forming a second sealing layer beneath the window sill. The material for the window support profile is selected based on strength criteria. Furthermore, the window support profile is designed in such a way that it directly transmits forces into the underlying crossbar, while the window sill support profile is essentially not involved in this force transmission. The compressive strength of the closed-cell insulating material is therefore correspondingly lower. The side element ensures a watertight lateral closure of the tub shape and should preferably be made of a moisture-resistant material.The moisture-resistant plastic material of the window support profile is particularly sustainable because it can be made from recycled PET bottles, for example. This material is preferably used to produce extruded foam boards, which exhibit the desired high compressive strength in the extrusion direction.

[0013] The terms "outside," "bottom," "top," "inside," and "side" refer to the window or door installed in the building opening. The same applies to terms with the same root word and related terms such as "front" (assigned to the outside) or "rear" (assigned to the inside). The term "significant" in claim 1 means a volume fraction of more than 75%, preferably more than 85%. The term "closed-cell" in the claims means that at least 95% of the cells of the foam material are closed. Open cells are primarily created by machining and thermal processing after extrusion, for example, by cutting the profiles to length.

[0014] Advantageous further developments of the invention are the subject of the subclaims.

[0015] Advantageously, the window sill substructure can additionally fulfil at least one of the following additional features: The window sill support profile is connected to the window support profile in a form-fitting and material-locking manner, particularly directly. The window support profile has a receiving recess at its base facing the window sill support profile, in which a portion of the window sill support profile is arranged in a form-fitting manner. In the area of ​​the receiving recess, the window support profile has a tongue and groove connection or a toothed connection with the window sill support profile. The window support profile and the window sill support profile are connected to each other in a material-locking manner using an adhesive and sealant.

[0016] The above-mentioned features favor the connection between the window sill support profile and the window support profile.

[0017] Particularly good thermal insulation is achieved if, according to one embodiment, the closed-cell insulation material of the window sill support profile is an XPS, preferably with a thermal conductivity of ≤ 0.04 W / (mK), more preferably ≤ 0.038 W / (mK) (according to DIN 4108-10). The window sill support profile can therefore be provided as a profile with a corresponding cross-sectional shape.

[0018] Advantageously, the moisture-resistant plastic of the window sill support profile can have a density of ≥ 30 kg / m 3 to ≤ 75 kg / m 3 . This ensures a particularly high gas content within the closed-cell insulation material, resulting in excellent insulating properties.

[0019] According to a further embodiment, the closed-cell insulation material of the window sill support profile can have a compressive strength at 10% compression of at least 200 kPa and a maximum of 900 kPa, preferably at least 280 kPa and a maximum of 720 kPa. For insulation materials, the compressive strength at 10% compression is usually determined in accordance with DIN EN 826, because these insulation materials always have a certain irreversible flexibility due to their cellular structure, especially if some cells collapse under load.

[0020] Closed-cell insulation materials already exhibit good moisture resistance. According to a further variant, the closed-cell insulation material of the window sill support profile is thermally treated, at least in the window sill support area, so that the surface in the treated area is smoothed and / or the surface pores are largely closed. This ensures that water running off the second sealing layer can be more effectively drained away, i.e., the flow resistance is reduced. If there are subsequently processed surface areas, for example, by cutting the extruded profile to length or creating grooves, etc., open surface pores can be closed again using thermal treatment.

[0021] According to one variant, the moisture-resistant plastic can have a density of at least 110 kg / m 3 , preferably at least 150 kg / m 3 , and a maximum of 400 kg / m 3 , preferably a maximum of 200 kg / m 3 . This allows a desired compromise between insulating properties and compressive strength to be found.

[0022] Furthermore, it can advantageously be provided that the at least one side element is formed from a flexible sealing film. Such a flexible sealing film has advantages when transporting such window sill substructures in stacks. Furthermore, structural tolerances and structural settlement or deformation can be better accommodated. This enables a precise adaptation to the side walls of the building opening in the lower corner areas. Furthermore, the lateral sealing of the window frame towards the building opening can be achieved using a compression tape (preferably a closed-cell sealing tape), which can very easily compensate for the thickness of the sealing film without any disadvantages in the sealing effect. In the lower corner areas, the seal is even reinforced because the compression tape is somewhat more compressed by inserting the sealing film between the two.

[0023] It may prove advantageous if the page element fulfills at least one of the following additional features: The sealing film has a base made of nonwoven fabric (material is PE (polyethylene)). The sealing film has a thickness of > 0.1 mm to ≤ 5 mm. The sealing film is designed as a sealing film with a water vapor permeability of 0.1 m to 100 m, preferably 0.1 m to 103 m. The sealing film is a UV-stabilized, windproof sealing film with a preferably black PU (polyurethane) coating. The sealing film is a tear-resistant sealing film with a resistance to tear propagation (longitudinal) of at least 150 N, preferably 200 N ± 20 N (according to DIN EN 12310-1). The sealing film is a tear-resistant sealing film with a resistance to tear propagation (transverse) of at least 135 N, preferably 185 N ± 20 N (according to DIN EN 12310-1). The basis weight of the sealing film is 50 g / m 2< to 400 g / m 2< , preferably 220 g / m 2< (± 10 %) (according to DIN 1849-2).

[0024] The above features promote the durability and functionality of at least one side element.

[0025] In one embodiment, the at least one side element is firmly and sealed laterally to both the associated lateral end face of the window sill support profile and the associated lateral end face of the window support profile. This simplifies the manufacture of the fastening of the side element because the side element only needs to be flanged to the other two profiles at the end face. The side element can be formed flat for this purpose, and folding it around the edge areas of the two support profiles is also unnecessary.

[0026] When connecting the at least one side element to the lateral end faces of the window sill support profile and the window support profile, one of the following additional features can advantageously be fulfilled: The front of the window support profile is fully covered by the side element. The front of the window sill support profile is covered by the side element as an extension of the underside of the window support profile. The side element ends flush with the rear vertical longitudinal front of the window support profile and thus does not protrude from the inside of the window sill substructure.

[0027] The above features lead to an effective use of at least one page element.

[0028] So that the side element not only closes off the trough shape in front of the window support profile at the sides, but also forms an advantageous lateral closure for an area above it and a lateral closure above the window support profile, a further embodiment provides for the side element to have a height such that the side wall of the trough shape formed by the side element projects at least 15 cm beyond a window support surface of the window support profile. The side element is therefore extended upwards far enough that it preferably projects above the lower stile of the window frame and the lower stile of the window frame above it, or at least ends flush with the upper edge of the lower stile of the window frame. This provides sufficient protection against water flowing over the window in the lower area.

[0029] A particularly advantageous variant is one in which the window support surface of the window support profile is flat and a closed-cell sealing strip is provided for sealing between the window support profile and a window that is to be placed on the window support profile of the window sill substructure. The window support profile should be designed entirely without closed grooves on the long sides in the area of ​​the window support surface. A stepped shoulder can only be provided on the long side edges, as long as the rest of the window support surface is flat and without further contouring. This ensures that the window frame, which is usually made of an extruded profile, rests securely on the window support surface with its load-bearing profile webs.Due to the flat design of the window support surface, it can be used for a variety of different profile shapes of the window frame together with a geometrically simple shaped sealing tape.

[0030] In some cases it is desired that the window frame protrudes beyond the window support profile on the outside. In order to nevertheless achieve good corner sealing, it can additionally be provided that a block-shaped additional element is arranged in the corner formed by the window sill support profile, the window support profile and the side element. The additional element stands on the window sill support profile, has a height which results from the height that the window support profile projects upwards above the window sill support profile, has a width which results from the width of a reveal panel to be placed on the window sill support profile, and has a thickness which results from the overhang that a window frame to be placed on the window support profile projects forwards beyond the window support profile.The block-shaped supplementary element fills the gap that arises in the lower corner of the tub shape between the protruding window frame and the window support profile. The supplementary element is preferably glued in place and extends the window support surface in the corner area to form an L-shape (in plan view).

[0031] To ensure the installation of a suitable window sill and proper drainage, one variant allows the window support profile to protrude at least 5 mm, preferably at least 20 mm, beyond the adjacent section of the window sill support profile, creating a corresponding offset (in height) between the window sill support profile and the window support profile. The offset also depends significantly on the window sill to be used, for example, whether a stone window sill or an aluminum window sill is to be installed.

[0032] To ensure good integration of the window sill substructure into the facade insulation, a further embodiment provides for a plaster connection profile to be attached to the front end area of ​​the window sill support profile. This profile protrudes beyond the front side of the window sill support profile and is arranged in a step of the window sill support profile such that the underside of the plaster connection profile merges flush with the top side of the window sill support profile or is slightly offset downwards, preferably by a maximum of 2 mm, compared to the top side of the window sill support profile. Such a plaster connection profile generally has a drip edge so that water flowing over the second sealing layer can drip down in front of the facade. Such a drip edge can be made of an elastic material.The specified arrangement of the plaster connection profile ensures that water can flow freely from the window sill support profile over the plaster connection profile. In many cases, the window sill support profile has a wedge-shaped cross-section, allowing water to flow outwards more easily. The plaster connection profile is preferably mounted on the front of the window sill support profile in such a way that it accommodates the inclination of this wedge shape and diverts water to such an extent that it does not directly penetrate the exterior plaster.

[0033] According to one variant, a reinforcing mesh can be attached to the plaster connection profile and hang downwards in front of the front of the window sill support profile when the window sill substructure is installed and before plastering, wherein the front of the window sill support profile has an offset step in most of the area of ​​the reinforcing mesh such that in the area of ​​the offset step there is a greater horizontal distance between the reinforcing mesh and the window sill support profile than in the area without the offset step. This ensures that the reinforcing mesh can be arranged mainly inside the base plaster because the offset step places part of the base plaster (seen in the thickness direction) between the offset step and the reinforcing mesh. This design therefore results in a plastering aid that favors the arrangement of the reinforcing mesh in the upper (front) third of the base plaster.

[0034] With regard to the plaster connection profile, it may prove advantageous if it has at least one of the following additional features: The gap between the reinforcement mesh and the window sill support profile is between 1.5 mm and 9 mm in the offset area. The plaster connection profile is glued to the window sill support profile in a watertight manner. The plaster connection profile has a protruding drip edge (projects further than the exterior plaster to be applied).

[0035] The above features represent advantageous design options for the plaster connection profile.

[0036] According to a further embodiment, the window sill support profile can advantageously have a height offset on the underside to form a support step whose recessed support surface merges flush with the underside of the window support profile. On the one hand, the height offset interrupts the gap existing beneath the window sill substructure and, on the other hand, serves as a positioning aid when attaching the window sill substructure.

[0037] It may prove advantageous if the window sill substructure has at least one of the following additional features with regard to the height offset: The height offset is at least 10 mm.

[0038] The above features promote good positioning of the window sill substructure.

[0039] Advantageously, it is not necessary to assemble the window sill substructure from its individual components in the area of ​​the building opening. Therefore, another design provides for the window sill substructure to be prefabricated and prepared for immediate, uniform insertion into a building opening. This design is particularly advantageous when the widths of the building openings are specified or guaranteed. Particularly in prefabricated house construction, relatively tight tolerances exist, making this type of prefabrication extremely beneficial. The installer simply needs to connect the window sill substructure to the lower crossbar of the building opening to ensure the desired provisions for suitable sealing in the lower corner area of ​​the building opening.

[0040] Embodiments of the invention are explained in more detail below with reference to the drawings. They show: Figure 1a cross-sectional view of an embodiment of a window sill substructure with aluminum window sill inserted into a building opening, Figure 2a perspective view of the window sill substructure made of Figure 1 , Figure 3 a top view of the window sill substructure from Figure 2 , Figure 4 a perspective view of a variant of the window sill substructure made of Figure 1 , Figure 5 a top view of the window sill substructure from Figure 4 , Figure 6 a cross-sectional view of the embodiment of the window sill substructure with stone window sill inserted into a building opening.

[0041] In Figure 1A window sill substructure 1 according to the invention is shown installed in the lower area of ​​a building opening 2. In the present case, the building opening 2 is a window opening. However, it can also be a door opening. The building opening 2 is rectangular in cross-section and closed on its four sides. The lower side surface 3 of the building opening 2 is formed by a crossbar 4. In the embodiment shown, the crossbar 4 is a KVH (structural solid timber) bar, which is used, for example, in a building with a wooden construction. A section of the facade insulation 5 is located in front of the crossbar 4.

[0042] The window sill substructure 1 essentially has four main components; the window sill support profile 6, the window support profile 7, the two side elements 8 arranged on the front sides (see also Figure 2) and the plaster connection profile 9. The window 11 is placed on the newly designed window support surface 10. The window 11 comprises a window frame 12, which rests on the window support profile 7, a window frame 13, which is pivotally attached to the window frame 12 for opening and closing the window 11, and the window panes 14 arranged in the window frame 13. In the present case, the profiles for the window frame 12 and the window frame 13 are extruded plastic profiles. The structure of such windows 11 is well known and will not be explained in detail here. In any case, the window sill substructure 1 is intended to be used for a wide variety of window designs, as long as they are suitable for use in the respective building opening 2. It should only be mentioned that the profiles of the window frame 12 each have several adjacent webs 15 on the peripheral sides of the window frame 12.1-15.5 with grooves in between. A closed-cell sealing strip (not shown) is arranged between the window frame 12 and the window support profile 7. A similar closed-cell sealing strip (compression strip) is also located between the lateral surfaces of the building opening 2 and the correspondingly assigned stiles of the window frame 12. The lower cross stile of the window frame 12 is wider than a width B of the window support profile 7, so that it projects beyond the window support surface 10 of the window support profile 7 on both the outside and the inside, i.e., the web 15.1 is located at a distance in front of the window support profile 7 and the web 15.5 is located at a shorter distance behind the window support profile 7.

[0043] The window support profile 7 has an approximately rectangular cross-section. Due to the flat and groove-free window support surface 10, a wide variety of windows 11 can be mounted. The underside 16 of the window support profile 7 rests fully on the lower side surface 3 of the building opening 2. Typically, the window sill substructure 1 and the lower side surface 3 of the building opening 2 are bonded. The window support profile 7 is made of recycled PET and is manufactured through an extrusion process. The plastic used is moisture-resistant and gives the window support profile 7 a compressive strength of approximately 1.5 MPa. The density is approximately 150 kg / m³. Due to these properties, the window support profile 7 is well suited for load transfer from the window 11 to the crossbar 4.The window support profile 7 is provided at its base with a flat receiving recess 17 facing the window sill support profile 6, which extends approximately over half the height H (preferably between 20 mm and 35 mm) of the window support profile 7. The receiving recess 17 has a profile so that the window support profile 7 and the window sill support profile 6 can be connected to one another by means of a precisely fitting tongue and groove connection. For this purpose, the rear side 18 of the window sill support profile 6, which is also provided with a complementary profile, is inserted into the receiving recess 17. Due to this design, the window sill support profile 6 borders on the front side of the window support profile 7. To ensure that the window support profile 7 and the window sill support profile 6 are firmly connected to one another, an adhesive and sealant is additionally used, so that in addition to the positive fit, a material-to-material connection is also created.This creates a watertight connection between the window sill support profile 6 and the window support profile 7 over the entire length. The window sill support profile 6 and the window support profile 7 have the same overall length, so they fit flush with each other at the end faces.

[0044] The window sill support profile 6, which has a wedge-shaped cross-section, is made of XPS, i.e. a closed-cell insulating material, with a thermal conductivity of 0.038 W / (mK) and a density of > 30 kg / m 3 < . Furthermore, the XPS has a compressive strength of approximately 300 kPa at 10% compression. The inclined window sill support surface 19 was smoothed by means of a thermal treatment. The cut-to-length end faces have also preferably been treated with a thermal process to close any open pores. The window sill support surface 19 serves as a second sealing level, which runs beneath a window sill 20 to be attached. The window sill support profile 6 has a height offset 22 on the underside 21. This creates a step so that the lower area of ​​the window sill support profile 6 can abut the crossbar 4 on the end face, thereby forming a positioning aid.The higher area of ​​the step rests on the lower side surface 3 of the cross bar 4 and is thus flush with the underside 16 of the window support profile 7. The offset in height between the window sill support surface 19 of the window sill support profile 6 and the window support surface 10 of the window support profile 7 is 30 mm in the present case.

[0045] The side elements 8 each consist of a thin and flexible sealing film that is cut approximately in a trapezoidal shape. The lower edge 23 of the side elements 8 runs flush with the underside 16 of the window support profile 7 and the corresponding step surface of the height offset 22 of the window sill support profile 6. The rear edge 24 of the side elements 8 runs flush with the rear vertical longitudinal end face 25 of the window support profile 7. The side elements 8 protrude approximately 15 cm above the window support surface 10, so that the short upper edge 26 of the side elements 8 is arranged above the lower stile of the window frame 13 and thus at the level of the window panes 14. The front edge 27 of the side elements 8 ends at the front upper corner of the window sill support profile 6 and then continues flush with the front side 28 of the window sill support profile 6.The side elements 8 are placed on the end faces of the window sill support profile 6 and the window support profile 7 and glued to them, creating a firm and watertight connection. This means that the end face of the window support profile 7 and the end face of the window sill support profile 6 are fully covered by one of the side elements 8 each, and the end face of the window sill support profile 6 is almost fully covered by one of the side elements 8 each. Only the area of ​​the window sill support profile 6 that protrudes downwards beyond the lower side surface 3 of the crossbar 4 is not covered by a side element 8. The sealing film used for the side elements 8 has a base made of nonwoven fabric (PE) with a polyurethane coating. This makes the sealing film UV-stabilized and wind- and watertight. Nevertheless, it is a diffusion-open sealing film with a water vapor permeability of 0.13 m± 0.03 m².The thickness of the sealing film in this case is 1.5 mm. The sealing film is tear-resistant with a tear resistance (longitudinal) of 200 N ± 20 N and a tear resistance (transverse) of 185 N ± 20 N (according to DIN EN 12310-1). The basis weight of the sealing film is 220 g / m² (± 10%) (according to DIN 1849-2).

[0046] Due to the selected design, the window sill substructure 1 has a tub shape that is open at the front, with the window sill support profile 6 forming the bottom of the tub shape, the window support profile 7 forming the rear wall of the tub shape and the two side elements 8 forming the side walls of the tub shape.

[0047] In Figure 1An aluminum window sill 20 is arranged on the window sill substructure 1. The window sill 20 has a window sill upstand 29 which is connected, in particular screwed, to the upper region of the window support profile 7. The central window sill region 30 runs at a parallel distance to the window sill support surface 19 and protrudes a few centimeters above it. Therefore, the central window sill region 30 has the same (preferably a similar) inclination as the window sill support surface 19, so that water can drain outwards from the window sill 20. For this purpose, thick beads of adhesive are applied next to one another at a parallel distance on the window sill support surface 19, so that parallel drainage channels are formed between the central window sill region 30 and the window sill support surface 19, through which water can drain forward.At the front end of the window sill 20 is a drip rail 31 that extends downwards and forms a drip nose at its free end. Window sill end pieces 32 are pushed onto the window sill 20 at each side, thus forming a lateral end of the window sill. A gap remains between the window sill end pieces 32 and the side walls 8 so that a reveal panel (not shown) adapted to the sloping window sill support surface 19 can be placed on the window sill support profile 6.

[0048] In the front area, the window sill support profile 6 has a step 33 into which a first leg 34 of the plaster connection profile 9 is inserted. As a result, the upper side of the first leg 34 runs flush with the window sill support surface 19. A second leg 35 of the plaster connection profile 9 extends downwards and lies flush with the front side 28 of the window sill support profile 6. The plaster connection profile 9 has a drip strip 36 made of a rubber-elastic material that protrudes as an extension of the first leg 34. A reinforcing mesh 37 hangs downwards directly from the corner area between the drip strip 36 and the second leg 35. The length of the reinforcing mesh 37 is selected so that it is at least 50 mm long.Adjacent to the lower end of the second leg 35, the window sill support profile 6 has an offset step 38 on the front side 28, creating a gap of approximately 2.5 mm between the window sill support profile 6 and the reinforcing mesh 37. This ensures that the reinforcing mesh 37 is positioned approximately in the upper (front) third of a base coat of plaster 39 applied to the facade insulation 5. The finished plaster 40 is then applied to the base coat 39. The drip edge 36 is sized in length such that it protrudes outwards beyond the finished plaster 40. The plaster connection profile 9 is glued to the window sill support profile 6 and is thus firmly and watertightly connected to it. Due to the height offset 22 and the offset step 38, the underside 21 of the window sill support profile 76 has a width that is precisely matched to the thickness of the facade insulation 5.In this respect, a secure connection of this element of the window sill substructure 1 to the facade insulation 5 is also possible.

[0049] Based on the Figures 2 and 3 It can be seen that the drip strip 36 is shorter than the rest of the plaster connection profile 9. The then remaining distance between the drip strip 36 and the side elements 8 essentially corresponds to a reveal panel that is still to be attached and which abuts the window frame 12 on the front with a seal interposed.

[0050] The outward-facing side surfaces of the side elements 8 are connected, preferably glued, both to the side surfaces of the building opening 2 and to any facade insulation present there. A sealing tape, inserted laterally between the vertical stiles of the window frame 12, extends from the window support profile 7, initially upwards along a side element 8 and then, above the upper edge 26 of the side element 8, rests directly against a side surface of the building opening 2. Due to the relatively small thickness of the side element 8, the sealing tape easily compensates for the thickness.

[0051] On the inside of the building, on the lower side surface 3, directly adjacent to the window sill substructure 1, there is a filler piece 41 and an interior window sill 42 arranged thereon. Furthermore, below the interior window sill 42 there is initially an interior paneling 43 (e.g. a wooden panel) and a further interior paneling 44 (e.g. a plasterboard) arranged above it.

[0052] The window sill substructure 1 described in detail above simplifies the sealed arrangement of a window sill 20 and a window 11 in a building opening 2. Due to the formed watertight tub shape, an automatically sealed insulation is created while simultaneously forming a second sealing level under the window sill 20. Ideally, the already prefabricated and prepared window sill substructure 1, as in Figures 2 and 3As shown, they are placed on the crossbar 4 of a building opening 2 and the facade insulation 5 and firmly connected to them. Due to their flexibility, the side elements 8 can be pressed laterally and glued to both the building opening 2 and the facade insulation 5. Window 11 is then installed with the appropriate sealing strips in place. Then the side reveal panels are inserted. Finally, the plastering is applied.

[0053] The window sill substructure 1 can be manufactured in various lengths and widths. The window support profile 7 was designed to be suitable for a wide variety of windows 11 available on the market. The weight of the window 11 is optimally transferred to the crossbar 4 by means of the window support profile 7. At the same time, excellent insulation is achieved in the area of ​​the window sill 20 and a second sealing layer is provided. Due to the materials selected for the individual elements of the window sill substructure 1 and the watertight connection of the elements to one another, a good seal is inevitably achieved in the lower corner area of ​​the building opening 2.

[0054] Based on the Figures 4 and 5A variant of the window sill substructure 1 will now be explained in more detail. Only the essential differences from the previous embodiment will be discussed, which is why, with regard to functional and structural features not mentioned, reference is made to the above description using the same reference numerals.

[0055] The essential difference is that a block-shaped supplementary element 45 is arranged in the corner area between the window sill support profile 6, the window support profile 7, and a side element 8. The supplementary element 45 is glued to all three elements and sits on the window sill support profile 6. For this purpose, it is beveled at the bottom according to the inclination of the window sill support surface 19. The height HE of the supplementary element 45 corresponds to the height by which the window support profile 7 projects above the window sill support profile 6. The thickness DE of the supplementary element 45 corresponds to the projection Ü (see Figure 1), which the window frame 12 placed on the window support profile 7 protrudes forwards over the window support profile 7. As a result, the supplementary element 45 is flush with the outside of the window frame 12. The width BE of the supplementary element 45 corresponds to the width of a reveal panel (not shown) to be placed on the window sill support profile 6. Depending on the use of the window 20, the sealing in this area can be further improved by the supplementary element 50. The Figures 4 and 5 The window sill substructure 1 shown can be installed in the same way as the Figure 1 shown variant can be inserted into the same building opening 2.

[0056] Based on the Figure 6An installation situation of a window sill substructure 1 with a window sill 20 made of stone is described. For this type of window sill 20, no window sill end pieces 32 are required. Otherwise, the overall construction changes compared to the Figure 1 not, which is why, using the same reference numerals, reference is made to the above description with regard to all other functional and structural features. The stone window sill 20 is pushed under the first web 15.1 of the window frame 12, so that the rear end of the window sill 20 is spaced from the window support profile 7. This allows water to drain behind the window sill 20. The window sill 20 is again glued at a parallel distance from the window sill support surface 19 using the technique described above, so that drainage channels are formed beneath the window sill 20. List of reference symbols

[0057] 1 Window sill substructure 2 Building opening 3 Side surface 4 Crossbar 5 Facade insulation 6 Window sill support profile 7 Window support profile 8 Side element 9 Plaster connection profile 10 Window support surface 11 Window 12 Window frame 13 Window frame 14 Window panes 15.1 First web 15.2 Second web 15.3 Third web 15.4 Fourth web 15.5 Fifth web 16 Bottom of window support profile 17 Recess 18 Rear 19 Window sill support surface 20 Window sill 21 Bottom of window sill support profile 22 Height offset 23 Bottom edge of sealing film 24 Rear edge of sealing film 25 Longitudinal end of window sill support profile 26 Top edge of sealing film 27 Front edge of sealing film 28 Front of window sill support profile 29 Window sill upstand 30 Middle window sill area 31 Drip strip 32 Window sill edge piece 33 Step 34 First leg 35 Second leg 36 Drip strip 37 Reinforcing mesh 38 Step 39 Base plaster 40 Decorative plaster 41 Filler piece 42 Interior window sill 43 Interior paneling 44 Interior paneling 45 Supplementary element BWidth of window support profile HHeight of window support profile ÜProtrusion HE Height of additional element DE Thickness of additional element BE Width of additional element.

Claims

1. Window sill substructure (1) in a watertight and open-fronted tub shape for a building opening (2), comprising a window sill support profile (6) as the bottom of the tub shape, a window support profile (7) as the rear wall of the tub shape and at least one side element (8) as the side wall or side walls of the tub shape, wherein the side element (8) is firmly and sealed connected to the window sill support profile (6) and the window support profile (7), and wherein the side element (8) also forms a lateral closure above and to the side of the window support profile (7), characterized in thatthe window sill support profile (6) adjoins the window support profile (7) on the front side and is firmly and sealed connected to it, that the window sill support profile (6) consists primarily of a closed-cell insulating material, that the window support profile (7) consists primarily of a moisture-resistant plastic with a high compressive strength, that the moisture-resistant plastic of the window support profile (7) is a recycled PET with a compressive strength of at least 1.15 MPa, preferably of at least 2.5 MPa, and that the compressive strength of the moisture-resistant plastic is higher than the compressive strength of the closed-cell insulating material of the window sill support profile (6).

2. Window sill substructure (1) according to claim 1, characterized in that the closed-cell insulation material of the window sill support profile (6) is an XPS, preferably with a thermal conductivity of ≤ 0.04 W / (mK).

3. Window sill substructure (1) according to claim 1 or 2, characterized in that the closed-cell insulation material of the window sill support profile (6) has a density of ≥ 30 kg / m 3 up to ≤ 75kg / m 3 has.

4. Window sill substructure (1) according to one of claims 1 to 3, characterized in that the closed-cell insulation material of the window sill support profile (6) has a compressive strength at 10% compression of at least 200 kPa and max. 900 kPa, preferably at least 280 kPa and max. 720 kPa.

5. Window sill substructure (1) according to one of claims 1 to 4, characterized in that the closed-cell insulation material of the window sill support profile (6) is thermally treated at least in the window sill support area in such a way that the surface in the treated area is smoothed and / or the surface pores are predominantly closed.

6. Window sill substructure (1) according to one of claims 1 to 5, characterized in that the at least one side element (8) is formed by a flexible sealing film.

7. Window sill substructure (1) according to one of claims 1 to 7, characterized in that the at least one side element (8) is firmly and sealed laterally connected both to the associated lateral end face of the window sill support profile (6) and to the associated lateral end face of the window support profile (7).

8. Window sill substructure (1) according to one of claims 1 to 7, characterized in that the side element (8) has a height such that the side wall of the tub shape formed by the side element (8) projects beyond a window support surface (10) of the window support profile (7) of the window sill substructure (1) by at least 15 cm.

9. Window sill substructure according to one of claims 1 to 8, characterized in thata window support surface (10) of the window support profile (7) is flat and a closed-cell sealing strip is provided for sealing between the window support profile (7) and a window to be placed on the window support profile (7) of the window sill substructure (1).

10. Window sill substructure (1) according to one of claims 1 to 9, characterized in thatin the corner formed by the window sill support profile (6), the window support profile (7) and the side element (8), a block-shaped supplementary element (45) is arranged, wherein the supplementary element (45) stands on the window sill support profile (6), has a height which results from the height by which the window support profile (7) projects upwards above the window sill support profile (6), has a width which results from the width of a reveal panel to be placed on the window sill support profile (6), and has a thickness which results from the overhang by which a window frame (12) to be placed on the window support profile (7) projects forwards beyond the window support profile (7).

11. Window sill substructure (1) according to one of claims 1 to 10, characterized in thatthe window support profile (7) protrudes at least 5 mm, preferably at least 20 mm, beyond the adjacent section of the window sill support profile (6) so that a corresponding offset is formed between the window sill support profile (6) and the window support profile (7).

12. Window sill substructure (1) according to one of claims 1 to 11, characterized in that at the front end region of the window sill support profile, a plaster connection profile (9) is attached, which projects beyond the front side (28) of the window sill support profile (6) and is arranged in a step (33) of the window sill support profile (6) in such a way that the upper side of the plaster connection profile (9) merges flush into the upper side of the window sill support profile (6) or is arranged slightly, preferably a maximum of 2 mm, offset downwards relative to the upper side of the window sill support profile (6).

13. Window sill substructure (1) according to one of claims 1 to 12, characterized in thata reinforcing mesh (37) is attached to the plaster connection profile (9) and hangs downwards in front of the front side of the window sill support profile (7) when the window sill substructure (1) is installed and before plastering, wherein the front side of the window sill support profile (7) has an offset step (38) in most of the area of ​​the reinforcing mesh (37) such that in the area of ​​the offset step (38) there is a greater horizontal distance between the reinforcing mesh (37) and the window sill support profile (6) than in the area without the offset step (38).

14. Window sill substructure (1) according to one of claims 1 to 13, characterized in that the window sill support profile (6) has a height offset (22) on the underside in order to form a support step, the recessed support surface of which merges flush with an underside (16) of the window support profile (7).

15. Window sill substructure (1) according to one of claims 1 to 14, which is prefabricated and prepared for direct, uniform insertion into the building opening (2).

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