Roof underlayment

Abstract

To provide a roof underlayment with a non-slip surface. [Solution] The roof underlayment 1 comprises an asphalt layer 2 and an anti-slip surface layer 3 made of nonwoven fabric, wherein the surface of the anti-slip surface layer 3 is provided with a painted surface 10 formed by applying a resin-based paint 11 and an unpainted surface 20 where the resin-based paint 11 is not applied, and the unpainted surface 20 is arranged between adjacent painted surfaces 10, 10. The painted surfaces 10 and the unpainted surfaces 20 are each formed in a strip shape and arranged alternately.

Description

Technical Field

[0001] The present invention relates to an under-roof covering material.

Background Art

[0002] In the roof of a house or the like, an under-roof covering material is usually laid between a roof base material such as plywood or rough board and a roof material such as tiles. As the under-roof covering material, those having a surface of mineral powder particles, such as asphalt roofing 940 (JIS A 6005), are generally used.

[0003] On the other hand, a material having mineral powder particles scattered on the surface of the main body is disclosed in, for example, Patent Document 1. The under-roof covering material of Patent Document 1 forms a rubber asphalt coating layer on both surfaces of an asphalt felt (base material), forms a mineral powder particle adhesion layer on one surface of the rubber asphalt coating layer, and provides a resin film layer on the other surface side. When the under-roof covering material is constructed on a pitched roof, it is difficult for an operator to slip when standing on it, and there is no stickiness to the sole of the shoe. However, in this under-roof covering material, since the mineral powder particles are scattered over the entire surface of the main body without gaps, the purpose of making it difficult for an operator to slip has been achieved, but the problem has been pointed out that the under-roof covering material itself becomes heavy and is difficult to handle during laying by the constructor.

[0004] Therefore, in order to reduce the weight of the under-roof covering material, there is a material in which a non-woven fabric layer is laid on an asphalt layer and an anti-slip paint is applied to the non-woven fabric layer (see, for example, Patent Document 2). In the under-roof covering material having such a configuration, by applying an anti-slip paint to the non-woven fabric layer, it is possible to prevent the non-woven fabric from fraying and becoming slippery, and weight reduction can be achieved.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

[0006] However, in the configuration of Patent Document 2, after the underlayment is installed outdoors, sand and other debris can adhere to the surface of the applied anti-slip coating, making it slippery before the roofing material is laid.

[0007] Therefore, the present invention was developed to solve the aforementioned problems, and aims to provide a roof underlayment with a non-slip surface. [Means for solving the problem]

[0008] The present invention, which solves the aforementioned problems, is a roof underlayment comprising an asphalt layer and an anti-slip surface layer made of nonwoven fabric, wherein the surface of the anti-slip surface layer is provided with a painted surface formed by applying a resin-based paint and an unpainted surface where the anti-slip paint is not applied, and the unpainted surface is arranged between adjacent painted surfaces.

[0009] With the roof underlayment of the present invention, even if sand or dust adheres to the painted surface and makes it slippery, the sand and dust penetrate into the unpainted surface, making it less slippery. In other words, looking at the roof underlayment as a whole, feet stop on the unpainted surface, thus maintaining its anti-slip performance. Furthermore, sand and dust that blow onto the roof underlayment are captured on the unpainted surface and penetrate into the interior, making it difficult for them to move to the painted surface, thus reducing the amount of sand and dust that adheres to the painted surface. In addition, the nonwoven fabric is adjacent to the painted surface, making it less likely to fray. As a result, the anti-slip performance of the unpainted surface can be maintained.

[0010] In the roof underlayment of the present invention, it is preferable that the painted surface and the unpainted surface are each formed in a strip shape and arranged alternately. Furthermore, in the roof underlayment of the present invention, it is preferable that the painted surface and the unpainted surface are arranged alternately along the direction of the water slope. Moreover, in the roof underlayment of the present invention, it is preferable that the painted surface and the unpainted surface exhibit a wave-like pattern. Furthermore, in the roof underlayment of the present invention, it is preferable that the width dimension of the painted surface is greater than the width dimension of the unpainted surface. With these configurations, it becomes easier to capture sand and dust with the nonwoven fabric exposed on the unpainted surface. Furthermore, fraying of the nonwoven fabric becomes even less likely to occur. [Effects of the Invention]

[0011] The roof underlayment according to the present invention makes the surface less slippery. [Brief explanation of the drawing]

[0012] [Figure 1] This is a plan view showing a roof underlayment according to an embodiment of the present invention. [Figure 2] This is a cross-sectional view showing a roof underlayment according to an embodiment of the present invention. [Modes for carrying out the invention]

[0013] A roof underlayment according to an embodiment of the present invention will be described in detail with reference to the drawings. The roof underlayment of this embodiment is laid between roof base materials such as roof decking and roofing materials such as tiles on the roof of a house or the like. The roof underlayment is integrally formed in a sheet shape and is laid on top of the roof base materials, and the roofing materials are laid on top of the roof underlayment.

[0014] As shown in Figure 2, the roof underlayment 1 according to this embodiment comprises an asphalt layer 2 and an anti-slip surface layer 3. The asphalt layer 2 and the anti-slip surface layer 3 are formed in a sheet form as a single unit in advance at a factory or the like, and are transported to the construction site in a roll.

[0015] The asphalt layer 2 is formed by applying asphalt. The anti-slip surface layer 3 is made of nonwoven fabric and is laid on top of the asphalt layer 2. The roof underlayment 1 is about 1 mm thick, and the thickness of each layer is, for example, about 0.6 mm for the asphalt layer 2 and about 0.4 mm for the anti-slip surface layer 3. At the bottom of the anti-slip surface layer 3 in the thickness direction, the asphalt from the asphalt layer 2 has impregnated the nonwoven fabric, forming an asphalt-impregnated portion 5. The asphalt-impregnated portion 5 is formed from the bottom of the anti-slip surface layer 3 to about half its thickness. The surface 3a of the anti-slip surface layer 3 is not impregnated with asphalt, and the fibers are exposed, so it can capture sand and dust.

[0016] As shown in Figure 1, the surface of the anti-slip surface layer 3 is provided with a painted surface 10 and an unpainted surface 20. The painted surface 10 is formed by applying a resin-based paint 11. The resin-based paint 11 is preferably one that has anti-slip properties, and is composed of, for example, acrylic, urethane, epoxy, or polyester resins. In this embodiment, mineral powder particles are not added to the resin-based material 11, but mineral powder particles of several tens of micrometers may be added to the resin-based paint 11 and applied as an anti-slip paint. The uncoated surface 20 is the area to which the resin-based paint 11 is not applied. On the uncoated surface 20, the surface 3a of the anti-slip surface material layer 3 is exposed.

[0017] The painted surface 10 and the unpainted surface 20 are each formed in a strip shape and are arranged alternately along the direction of the water slope. In this embodiment, the painted surface 10 and the unpainted surface 20 are arranged alternately along the direction of the water slope (see the downward arrow in Figure 1). Furthermore, both the painted surface 10 and the unpainted surface 20 exhibit a wave-like pattern. The wave-like pattern extends in the lateral direction. Specifically, the wave-like pattern is constructed by connecting a straight, upward-sloping hypotenuse L1 and a downward-sloping hypotenuse L2 at a corner C, with the upper corner C and the lower corner C being arranged alternately along the lateral direction intersecting the direction of the water slope. Note that the shape of the wave-like pattern is not limited to the above configuration and may be a sinusoidal shape with curved corners. The width dimension of the wave-like pattern on the painted surface 10 is greater than the width dimension of the wave-like pattern on the unpainted surface 20. In other words, the painted surface 10 has a wider wave-like shape than the unpainted surface 20. The width of the corrugated surface 10 is, for example, about 10 cm to 20 cm, and it is configured so that when a worker steps onto the roof underlayment 1, the soles of their shoes come into contact with both the painted surface 10 and at least one unpainted surface 20. The ratio of the area of ​​the painted surface 10 to the area of ​​the unpainted surface 20 is preferably 70:30.

[0018] When laying the roof underlayment 1 with the above configuration onto the roof base material, the roll-shaped roof underlayment 1 is spread out so that it extends horizontally. The roof underlayment 1 is laid from the downstream side of the water slope, and is installed so that the upper edge of the roof underlayment 1 on the downstream side is covered by the lower edge of the roof underlayment 1 on the upstream side.

[0019] According to the roof underlayment 1 of this embodiment, even if sand or dust adheres to the painted surface 10 and makes it slippery, the sand and dust will penetrate into the unpainted surface 20, making it less slippery. Furthermore, in this embodiment, the soles of the shoes of a worker standing on the roof underlayment 1 will come into contact with at least one unpainted surface 20, so when considering the roof underlayment 1 as a whole, the feet will stop at the unpainted surface 20. Therefore, the roof underlayment 1 can maintain its anti-slip performance.

[0020] In addition, since sand and dust that fly onto the under - roof covering material 1 are captured by the non - woven fabric on the surface 3a of the anti - slip surface material layer 3 exposed on the non - painted surface 20 and enter the interior, it becomes difficult for them to move to the painted surface 10, and the amount of sand and dust adhering to the painted surface 10 decreases.

[0021] Since the non - woven fabric of the anti - slip surface material layer 3 has a relatively small width dimension of the non - painted surface 20 and is further sandwiched from both sides in the width direction by the painted surface 10, it is difficult for fraying to occur. As a result, the function that the surface 3a of the anti - slip surface material layer 3 is difficult to slip and the function of capturing sand and dust can be maintained, so the anti - slip performance of the non - painted surface 20 can be retained.

[0022] In this embodiment, the painted surface 10 and the non - painted surface 20 are each formed in a strip shape and are alternately arranged along the water gradient direction. So, when an operator stands facing the water gradient direction (vertical direction), the sole of the shoe touches at least one non - painted surface 20, preventing slipping. Also, since the painted surface 10 and the non - painted surface 20 exhibit a wavy pattern that meanders up and down, when an operator stands facing the direction perpendicular to the water gradient (horizontal direction), the sole of the shoe touches at least one non - painted surface 20, preventing slipping. Furthermore, the width dimension of the painted surface 10 is larger than the width dimension of the non - painted surface 20, and the ratio of the area of the painted surface 10 to the area of the non - painted surface 20 is 70:30. So, the non - painted surface 20 allows the sole of the foot to contact it, and the fibers of the non - painted surface 20 are sized such that fraying is difficult. Moreover, sand and dust can be preferably captured on the non - painted surface 20.

[0023] In addition, since the under - roof covering material 1 is formed in a sheet shape and wound in a roll shape, it is easy to transport. Also, at the construction site, it is only necessary to unfold and attach the sheet, so the construction labor at the site is less, and the laying construction on the roof surface can be easily carried out.

[0024] While embodiments for carrying out the present invention have been described above, the present invention is not limited to the above embodiments, and the design can be modified as appropriate without departing from the spirit of the invention. In the above embodiments, the wave pattern on the uncoated surface 20 extends in the horizontal direction, but the invention is not limited thereto. The wave pattern may extend in the direction of the water slope, or it may extend in an oblique direction. Regardless of which direction it extends, since the coated surface 10 and the uncoated surface 20 have a wave pattern, the soles of the feet of the worker can be placed on the uncoated surface 20 regardless of the orientation in which the worker stands on the roof underlayment 1.

[0025] Furthermore, the shape of the unpainted surface 20 is not limited to a wave pattern, but may be other shapes. As long as the spacing and shape allow workers standing on the roof underlayment to step on the unpainted surface, it may be a shape in which multiple sloping and sloping sides are placed horizontally with spacing between them, or a shape in which multiple straight or dashed lines are arranged in parallel. [Explanation of symbols]

[0026] 1. Underlayment for roofing 2. Asphalt layer 3 Anti-slip material layer 10 Paint coated surface 20 Unpainted surfaces

Claims

1. A roof underlayment comprising an asphalt layer and an anti-slip surface layer made of nonwoven fabric, The surface of the anti-slip material layer is provided with a painted surface formed by applying a resin-based paint, and an unpainted surface where no resin-based paint is applied. The aforementioned unpainted surface is positioned between adjacent painted surfaces. A roofing underlayment characterized by the following features.

2. The painted surface and the unpainted surface are each formed in a strip shape and arranged alternately. The roof underlayment material according to feature 1.

3. The painted surfaces and the unpainted surfaces are arranged alternately along the water slope direction. The roof underlayment material according to feature 2.

4. The painted surface and the unpainted surface exhibit a wavy pattern. The roof underlayment material according to feature 2.

5. The width dimension of the painted surface is greater than the width dimension of the unpainted surface. The roof underlayment material according to feature 2.

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