Process for constructing joints between bottom of window on outer wall and inside as well as outside of windowsill

Abstract

The invention relates to a construction process, especially relates to a process for constructing joints between the bottom of a window on an outer wall and the inside as well as outside of a windowsill. The process provided by the invention comprises the following steps: on a windowsill at the outside of the bottom of the window, performing direct outward insulating base layer (consisting of cement mortar screeding layers) to falls, wherein the peak of a slope is arranged at the position 1 / 3 away from the inner edge of a window frame; filling the bottom of the external window frame with polyurethane foams; after the external window frame of a building is installed, inserting an XPS insulation board at the outside of the bottom of the window into the bottom of the window; and then foamingfrom the indoor. Because the peak of the slope is arranged at the position 1 / 3 away from the inner edge of the window frame, the infiltrating positions of sealants are gaps between the outer edges ofthe window frame and outside surface mortar, and the outer sides; a joint seam between an insulation board at the horizontal plane of the external windowsill and an insulation board at the vertical plane of the external windowsill is a horizontal joint seam; and the height of the inside (completely closed up) of the windowsill is 10 mm higher than the taken outside of the windowsill. The process provided by the invention can control the water leakage phenomenon of the windowsill of the external window of a building better under the premise of guaranteeing no thermal bridge occurs.

Description

technical field [0001] The invention relates to a construction process for the joint between the bottom of the window of the outer wall and the inner and outer sides of the window sill, which belongs to the construction method of the inner and outer detail nodes of the window sill before and after the installation of the outer window of the building. On the premise of ensuring that no cold bridge problem occurs, the main Control the water leakage on the window sills of the building's exterior windows, especially for the exterior windows of buildings with "water nests" in the architectural shape. Background technique [0002] At present, there are many kinds of joints between the bottom of the building's exterior wall window and the inside and outside of the window sill, such as: 1. 2 / A8, 2 / A9, and 2 / A10 in 02J121-1 "External Wall External Insulation Building Construction (1)"; 2. 1 / 17, 2 / 17 in Liao 2004J107 "EPS External Insulation Wall Structure"; The detailed nodes in the...

AI Technical Summary

Problems solved by technology

If you use thermal insulation materials to find slopes, since all thermal insulation materials are flat when they enter the site, there is no slope. If you use them to find slopes, you need secondary processing on site, which first greatly affects the construction speed. The most important thing is that the thermal insulation materials It is soft and cannot guarantee a uniform slope, which not only affects the appearance, but also greatly increases the risk of water leakage

It is even more impractical to use the plastering mortar on the outside of the insulation material to find the slope. If the slope is too large, the thickness of the root and surface plastering mortar will increase, and the plastering mortar will easily crack, which will become a hidden danger of water leakage; (2) The bottom of the outer window frame in the national standard atlas node is designed to be directly filled with thermal insulation material (EPS board or XPS board), due to the characteristics of the material itself and the construction process The objective factors of the building greatly reduce the compactness of the bottom of the window frame outside the building, thus increasing the possibility of water leakage and cold bridge

(3) Although the bottom of the outer window frame in the node of Liaobiao Atlas is designed to be polyurethane foam, it does not consider how to better improve the density and expansion stress of the foam, because most of the projects are constructed at this node. The construction sequence adopted is: installation of building exterior window frames → polyurethane foaming around the perimeter → closure of building exterior windows inside and outside. Since there is no obstruction on the inside and outside of the window frame before foaming, the foam expands to both sides, so it cannot be better Exert foam density and expansion stress

(6) When designing the inner and outer sides of the bottom of the window, all the atlases did not clearly consider the height difference between the indoor and outdoor window sills

Images