JP7576499B2 - Repair method to prevent rainwater from running vertically - Google Patents

Description

The present invention relates to a repair method for preventing rainwater from running vertically through drywall materials used as exterior materials.

After the drywall material is installed, eaves may be installed to provide protection from rain or sun, or a windbreak may be installed.

Japanese Patent Publication No. 6-123164 Japanese Patent Application Publication No. 10-176422

Patent Document 1 describes the installation of retrofit eaves of various structures, using components with connecting means that allow for watertight joints to provide waterproofing against rainwater and drainage through grooves that catch rainwater. However, even if watertightness between the eaves and the existing exterior material can be guaranteed, there is a risk that rainwater that has seeped into the building body at the top of the eaves cannot be prevented from flowing down to the bottom of the eaves.

Meanwhile, Patent Document 2 describes a method of injecting a water-stopping material into gaps (cracks) that occur in wall materials to prevent rainwater from entering. This describes a repair method in which a porous body or water-stopping material is injected into gaps that occur after the wall material is installed, and this method also addresses the problem of gaps changing in size due to temperature changes. However, simply injecting a water-stopping material or the like will leave injection holes after the repair, and there is a risk that the installation area will be noticeable in exterior materials with a high level of design.

In consideration of the above circumstances, the present invention aims to prevent rainwater from entering and running vertically through the joints of existing exterior materials when retrofitting existing exterior materials with structures such as eaves or windbreaks through renovation or remodeling.

The present invention provides a method for repairing rainwater leakage above and below the repaired portion when repairing existing vertically installed drywall material, which includes the steps of removing the water-stopping material between the repaired portion and the drywall material above the repaired portion, creating a through hole in part of the drywall material, injecting and filling the gap in the fitting portion with water-stopping material, and then reapplying the water-stopping material that was removed above the repaired portion (hereinafter referred to as the repair method).

The repair method of the present invention allows for easy repair of rainwater infiltration when installing a retrofit structure on an existing exterior material, provides waterproofing, and maintains the design after repair.

1 is a side view showing an embodiment of a drywall material used in a repair method according to the present invention. FIG. 2 is a partially enlarged view of an embodiment of a drywall material used in the repair method according to the present invention. 1 is a cross-sectional view showing the fitting state of one embodiment of a drywall material used in the repair method of the present invention. FIG. FIG. 11 is a perspective view showing an example of installation of a pre-attached structure. FIG. 1 is a perspective view showing an example of rainwater running vertically through a retrofit structure used in the repair method according to the present invention. 1 is a cross-sectional view showing an embodiment of a repair method according to the present invention. FIG. 1 is a cross-sectional view showing an embodiment in which a repair method according to the present invention is carried out.

Below, an embodiment of the drywall material used in the repair method according to the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same elements are given the same reference numerals, and duplicated descriptions are omitted. FIG. 1 is a side view of an embodiment of the drywall material used in the repair method according to the present invention. FIG. 2(a) is a partially enlarged side view of a male part of an embodiment of the drywall material used in the repair method according to the present invention, and FIG. 2(b) is a partially enlarged side view of a female part of an embodiment of the drywall material used in the repair method according to the present invention. FIG. 3 is a cross-sectional view showing the fitting state of an embodiment of the drywall material used in the repair method according to the present invention. FIG. 4 is a perspective view showing an example of the construction of a pre-attached structure. FIG. 5 is a perspective view showing an example of rainwater leakage from a post-attached structure used in the repair method according to the present invention. FIG. 6(a) is a cross-sectional view showing an embodiment of the repair method according to the present invention when a through hole is provided, and FIG. 6(b) is a cross-sectional view showing an embodiment of the repair method according to the present invention when a water-stopping material is injected and filled. FIG. 7 is a cross-sectional view showing an embodiment of the repair method according to the present invention. The axes shown in the figures indicate the direction of each drawing. The X-axis represents the male side (Xi) to the female side (Xii) of the drywall material, the Y-axis represents the roof side (Yi) to the foundation side (Yii), and the Z-axis represents the exterior side (Zi) to the interior side (Zii).

Figure 1 shows a side view of drywall material 1 used in the repair method of the present invention. Drywall material 1 is composed of a metal surface material 2, a backing material 3, and a core material 4. Metal surface material 2 is, for example, iron, aluminum, copper, stainless steel, titanium, aluminum-zinc alloy plated steel plate, galvanized steel plate (registered trademark), enameled steel plate, clad steel plate, laminated steel plate (PVC steel plate, etc.), sandwich steel plate (vibration-damping steel plate, etc.), synthetic resin plate material such as polyvinyl chloride resin, polycarbonate resin, etc. (including, of course, color plates made by painting these in various colors) formed into various shapes by roll forming, press forming, etc. The backing material 3 may be made of one or more of the following materials: aluminum-deposited paper, craft paper, asphalt felt, metal foil (Al, Fe, Pb, Cu), synthetic sheet, rubber sheet, cloth sheet, gypsum paper, aluminum hydroxide paper, glass fiber nonwoven fabric, etc., or a laminate of two or more of these materials; or it may be made of a sheet-like material that has been treated to be waterproof or flame-retardant, or the above-mentioned metal steel plate, etc.

The core material 4 is made of synthetic resin foam such as polyurethane foam, polyisocyanurate foam, phenol foam, vinyl chloride foam, polyethylene foam, polystyrene foam, or urea foam. For example, it is made by mixing a resol-type phenol concentrate with a hardener and a foaming agent, discharging it onto the metal surface material 2 or the back side of the back material 3, and heating it to react, foam, and harden it. In addition, various types of flame retardants such as lightweight aggregates (perlite particles, glass beads, gypsum slag, talc stone, silt balloons, aluminum hydroxide, etc.) and fibrous materials (glass wool, rock wool, carbon fiber, graphite, etc.) can be mixed into the core material 4 to improve fire prevention and fire resistance.

Figure 2 (a) shows a partially enlarged side view of the male part 5 of the drywall material 1. The male part 5 has an engagement groove 13 between the fixing surface 11 and the mating piece 14, and a joint surface 16 connected by a step 15 is provided on the outdoor side of the mating piece 14. A rising piece 17 is provided on the female end of the joint surface 16, which is connected to the decorative surface 18. The fixing surface 11 has a fixing part 12.

Figure 2(b) shows a partially enlarged side view of the female part 6 of the drywall material 1. The female part 6 has a mating groove 20 between the engagement piece 19 and the cover piece 21. The cover piece 21 has an inner inclined part 22, a contact part 23, and an inclined part 24 on the mating groove 20 side, and is connected to the decorative surface 18. A gasket 25 may also be provided in the mating groove 20. The gasket 25 may be, for example, a polyvinyl chloride-based, chloroprene-based, chlorosulfonated polyethylene-based, ethylene propylene-based, asphalt-containing polyurethane-based, EPM, EPDM, or other commonly available commercially available gasket.

Figure 3 shows a cross-sectional view of the drywall material 1 in an interlocking state. The drywall material 1 can be attached to the furring strip 32 using the fastener 31. The interlocking piece 14 engages with the interlocking groove 20, and the interlocking piece 19 engages with the interlocking groove 13, thereby connecting the drywall materials 1 together. The interlocking gap 33 that is created when connected is made up of the interlocking piece 14, the step 15, the contact portion 23, the inner inclined portion 22, and the gasket 25.

Figure 4 shows a perspective view of an example of the installation of a pre-attached structure 43 on the exterior wall surface of a building. The pre-attached structure 43 is, for example, a roofing material or eaves, and is included in advance when designing a building. When the pre-attached structure 43 is a roofing material, as shown in Figure 4, after installing asphalt roofing 41, furring strips 42, and the pre-attached structure 43, a rain retaining casing board 44, a moisture-permeable waterproof sheet 45, and furring strips 46 are installed, and then a drywall material 1 or the like is installed on top of the pre-attached structure 43.

Figure 5 is a perspective view showing how rainwater runs vertically when a retrofit structure 51 is installed. The retrofit structure 51 is a canopy or windbreak, etc., and is attached to the outdoor side of the existing drywall material 1 during renovation or repair. When installing the retrofit structure 51, the joint surface 16 of the existing drywall material 1 cannot be divided in the X-axis direction as shown in Figure 4. Therefore, if rainwater 47 seeps into the fitting gap 33 from the joint surface 16 at the top of the retrofit structure 51 as shown in Figure 5, it may trickle down to the bottom of the retrofit structure 51, causing it to fail to fully function as a retrofit structure.

Figures 6 and 7 show cross-sectional views of one embodiment of the repair method according to the present invention. Figure 6(a) shows the process of creating a through hole 61, Figure 6(b) shows the process of injecting and filling a sealant 62, and Figure 7 shows the process of replacing the water-stopping material 52 removed from the upper part of the repaired area with water-stopping material 64.

The repair method according to the present invention is a repair method at the intersection between the joint surface 16 of the vertically installed drywall material 1 and the water-stop material 52 of the post-installation structure 51, and will be described in detail below. The water-stop material 52 is removed in the X-axis direction by about 20 mm each, centered on the end of the inclined portion 24 of the cover piece 21, to expose the joint surface 16, the rising piece 17, the cover piece 21, and the inclined portion 24. Then, using a tool or the like, a through hole 61 is formed in the cover piece 21 so as to penetrate the metal surface material 2, the core material 4, and the inner inclined portion 22. The through hole 61 is preferably formed at a position about 7 mm from the end of the inclined portion 24, and the depth is preferably about 6 mm or less in the Z-axis direction from the metal surface material 2. The diameter of the through hole 61 is preferably 5 mm or less. If the through hole 61 reaches the contact portion 23, there is a risk of damaging the step 15 of the drywall material 1, which may lead to water leakage from the inclined portion 24 side.

After the through hole 61 is created, the fitting gap 33 is filled with sealant 62. A sealing holder 63, which is narrower than the diameter of the through hole 61, is inserted into the fitting gap 33 and the sealant 62 is injected. In order to enhance the water-stopping effect, it is desirable to inject the sealant 62 until it overflows from the gap between the joint surface 16 and the contact portion 23 and from the through hole 61. However, the overflowing sealant 62 must be removed as soon as the filling of the fitting gap 33 is completed, as this may impair the design.

To seal the area where the water-stopping material 52 has been removed, new water-stopping material 64 is applied as shown in Figure 7, completing the repair.

To further improve workability in the process of injecting the sealant 62 described above, measures to prevent overflow using masking tape or the like may be taken. By providing masking tape or the like on the metal surface material 2 and on the retrofit structure 51 along the X-axis direction at the Y-axis direction end of the water-stopping material 52, it becomes easier to remove the overflowing sealant 62 and apply the water-stopping material 64.

Reference Signs List 1 drywall material 2 metal surface material 3 surface material 4 core material 5 male part 6 female part 11 fixing surface 12 fixing part 13 engagement groove 14 mating piece 15 step 16 joint surface 17 rising piece 18 decorative surface 19 engagement piece 20 mating groove 21 cover piece 22 inner inclined part 23 contact part
24 Inclined portion 25 Gasket 31 Fixing device 32 Furring strip 33 Fitting gap 41 Asphalt roofing 42 Furring strip 43 Pre-attached structure 44 Rain guard covering board 45 Moisture-permeable waterproof sheet 46 Furring strip 47 Rain 51 Post-attached structure 52 Water-stopping material 61 Through hole 62 Sealing 63 Sealing holder 64 Water-stopping material

Claims (1)

A method for repairing rainwater leaks that occur above and below a repaired portion of a vertically installed drywall material, comprising:
removing a waterproofing material between the repaired portion and the drywall material above the repaired portion;
After removing the waterproofing material, a step of providing a through hole in a portion of the drywall material;
After providing the through hole, a step of injecting and filling a water-stopping material into the fitting gap;
This repair method for preventing vertical running of rainwater includes a process of injecting the water-stopping material and then reapplying the water-stopping material that was removed above the repaired area.

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