CN101815838A - Self adhesive extensible and foldable corner flashing material for buildings - Google Patents

Abstract

A strip of flashing material for covering recessed corners in a building comprises an elastic, extensible topsheet and an adhesive layer with a release sheet 18. The release sheet 18 comprises prefabricated perforations (18e, 18g) representing crease lines which allow a facilitated folding of the flashing material according to a predetermined shape before removing the release sheet 18. The extensible topsheet allows an additional adaption to irregular angles and uneven surfaces of the recess.

Description

Self-adhesive, stretchable and foldable corner flashing material for buildings

technical field

The present invention relates to flashing members for corner waterproofing of recessed windows and other uneven openings in buildings such as doorway openings, plumbing channels and other types of openings found in houses and other architectural structures .

Background technique

In building construction, it is important to provide a watertight seal around any uneven openings in the exterior walls, including windows and doors. A particular problem in many buildings is the problem of sealing recessed windows. Recessed windows consist of an exterior wall opening flush with the exterior of the building and an interior recessed frame opening in a plane behind the exterior opening. Generally, the inner frame opening has a height and width that are smaller than the height and width of the outer frame opening. When the window is finally installed, it sits within the inner frame opening.

The corners of recessed windows are especially difficult to properly waterproof and seal. US Patent Publication 2005/0055890A discloses a corner flashing system for sealing the corners of recessed window frames against moisture penetration. The system includes two-piece members, half-square members and caulk. The two-piece and half-square members are preferably made of asphalt or petroleum based materials. US Patent 6,401,402 also discloses a flashing system and method for controlling water and air intrusion around windows, such as recessed windows, utilizing crumpled and folded flashing material to form corner flashing assemblies. However, both of these flashing systems include seams and gaps through which water can penetrate, and both rely on piercing fasteners such as staples to install the flashing, thereby providing more opportunities for water to infiltrate.

Accordingly, there is a need for a corner flashing system well suited for installation in recessed window frames.

Contents of the invention

In one aspect, the invention relates to a method for reentrant corners in flashing buildings, the method comprising:

providing a strip of flashing material comprising a resilient, conformable, flexible waterproof topsheet having an elongation of at least about 150% under an applied stress of no greater than 10 N/cm; covering The pressure-sensitive adhesive layer of a surface of described top sheet, described layer has the extension identical with top sheet under equivalent applied stress; And the release sheet that is removably bonded on the described adhesive layer , the release sheet has a transverse perforation that divides the release sheet into two main parts and a longitudinal perforation that divides the release sheet into an edge portion and a bulk portion; removes the triangular portion of the release sheet, wherein the triangular portion is The shape of an isosceles triangle bisected by the transverse perforations of the release sheet, wherein the triangle has an angle of 90° at the intersection of the longitudinal perforations and the transverse perforations, and is formed along the edge of the edge portion of the release sheet. 45° angle, thereby exposing the triangular portion of the adhesive layer; folding the flashing material along the transverse perforation, thereby joining the exposed adhesive layer on opposite sides of the fold line so that the exposed adhesive layer The mixture layer is continuously contacted; said waterproof sheet material is folded along said transverse perforation to form a right angle between topsheet surfaces, and said waterproof sheet material is folded along said longitudinal perforation to form a right angle between topsheet surfaces, thereby forming a corner flashing member; removing the remaining release sheet from the corner flashing member to expose the remaining adhesive layer; and

The exposed remaining adhesive layer is bonded to the reentrant surface, thereby securing the corner flashing member in the installed position.

In one aspect, the invention also relates to a flashing member comprising an integral self-adhesive sheet conforming to a reentrant corner in a building opening, wherein no fasteners are required to retain the member within the reentrant corner.

Description of drawings

Figure 1 is a perspective view of a corner flashing member of the present invention.

Figure 2 shows a cross-section of the flashing material used to form the corner flashing member of the present invention.

Figure 3 is an illustration of the self-adhesive flashing material used to form the corner flashing member of the present invention showing the pattern of the release sheet covering the adhesive layer of the flashing material.

Figure 4 is a perspective view of a recessed window fitted with a corner flashing member of the present invention.

Detailed ways

Figure 1 shows a corner flashing member 10 according to the present invention. The flashing material 12 has four faces 10a, 10a' (note that 10a and 10a' are coplanar), 10b and 10c in three planes which are at right angles to each other in the shape of a concave corner. These three planes share three common edges 11a, 11b and 11c. The corner flashing member is free of seams or holes through which water can seep behind the flashing member. The flashing material is resilient, conformable and pliable so that it not only fits into the recessed corner of the recessed window, but also stretches and wraps around the exterior wall. The length of flashing material on both sides of the corner is at least about 1 inch, and typically about 6 inches.

FIG. 2 shows a cross-section of the flashing material 12 . The flashing material 12 has a topsheet 14, a pressure sensitive adhesive layer 16 on one surface of the topsheet, and a release sheet 18 removably attached to the adhesive layer. The topsheet 14 is an elastic, conformable and flexible material. Suitable materials that may be used as the topsheet include elastic polymer films, elastic woven fabrics, elastic nonwovens, elastic knitted fabrics, and laminates thereof. The topsheet has an elongation of at least 150% when subjected to an applied stress of no greater than 10 N/cm. Preferably, for durability, the topsheet has a tensile strength greater than 1000 N/m, measured according to section 19 of ASTM D1682.

Adhesive layer 16 is an elastic, conformable and pliable adhesive. Suitable binders include materials conventionally used in the field of waterproofing, such as rubber-modified bituminous binders or butyl binders. The adhesive layer stretches an equivalent amount as the topsheet when subjected to an equivalent level of stress. Adhesive layer 16 may have an average thickness of 5 mils to 100 mils. The minimum thickness of the adhesive layer depends on what is required to provide good adhesion, and optionally, if desired, tack sealability given the adhesive composition used. For example, a 10 mil to 60 mil thick layer of butyl adhesive has been found to be sufficient.

Release sheet 18 may be any known material suitable for use as a release liner on rubberized asphalt and butyl adhesives.

An inventive method for forming the corner flashing member 10 will now be described. Discrete segments of an elongated strip of flashing material 12 are provided. FIG. 3 shows the pattern of perforations in the release sheet 18 . For each corner flashing member, a perforation 18e extending in the transverse direction (XD) divides the release sheet longitudinally into two approximately equal main parts, and a perforation 18f extending in the longitudinal direction (MD) divides the release sheet Divided into two unequal portions, a narrower edge portion 18a and a wider bulk portion 18b. A plurality of corner flashing members 10 may be formed from an elongated strip 12 of flashing material. Cut lines 18d represent locations where cuts are made in the flashing material to divide the elongated strip of flashing material into individual flashing material segments that each form a single corner flashing member.

The triangular portion 18c of the release sheet is removed from the flashing material 12, thereby exposing the triangular portion of the underlying adhesive layer. The triangle is defined by the perforations in the release sheet and the edges of the strip of flashing material. The apex of the triangle is at the intersection of the longitudinal perforation 18f and the transverse perforation 18e, where the triangle has an angle of 90°; and the base of the triangle is the edge of the strip, where the triangle has two angles of 45°. The triangular portion is bisected by a transverse perforation 18e. In embodiments where the triangular portion 18c of the release sheet is removed at the construction site immediately prior to installation, the triangular portion 18c of the release sheet may be perforated for removal at the construction site. Alternatively, use a pocket knife or utility knife to score and remove the triangle.

The strip of flashing material 12 is perforated across the transverse direction, joining the exposed adhesive layers on opposite sides of the fold line such that the exposed adhesive layers are in continuous contact. The resulting adhesive-to-adhesive layer effectively becomes one continuous adhesive layer with no spaces between the original adhesive layers. This provides no seams or holes through which water can seep. When the flashing material is folded, the resulting adhesive forms a strong and durable corner seal 20 to the adhesive layer as shown in FIG. 1 . In Figures 1 and 4, the corner flashing member 10 is depicted as a right hand corner, however the foldable flashing material allows the corner flashing member to fit into either a right hand corner or a left hand corner.

In some recessed windows it is common to mount a second frame member within the frame member in which the window is mounted. To accommodate such constructions, the edge portion of the release sheet of flashing material is made wider to cover the nailed fins of the window. In anticipation of the number of corner flashing members that can be used on various types of window constructions, multiple perforations can be made in the flashing material in the longitudinal direction.

Once the seal 20 is formed, the flashing material is folded along the transverse perforations in a direction opposite to the direction in which it was folded to form the seal 20 to form a right angle between the topsheet surfaces. The flashing material is also perforated longitudinally and folded to form right angles between the topsheet surfaces so that the corner flashing member 10 is formed.

This method for forming the flashing member may be performed at the beginning of the installation with a strip of flashing material. Alternatively, the corner members may be pre-formed and shipped to the construction site for subsequent installation. According to a preferred embodiment, a length of flashing material is formed with the aforementioned perforation pattern in the release sheet and the triangular portion 18c of the release sheet is removed to expose the underlying butyl adhesive. The length of flashing material is then folded in a "fan fold" fashion such that the material is folded in alternating directions at each transverse perforation and the exposed butyl adhesive is folded onto itself to form the seal 20 . The material thus folded can be packaged for shipment to the installation site. At the installation site, the installer can complete the shaping of the corner members just before installation by cutting along the perforations 18d to form individual corner flashing members, folding the members onto themselves, and then turning the corners over or making them "Inside out" to create a right corner shape for installation.

To install the corner flashing member, the release sheet is removed from the outer surface of the flashing member to expose the adhesive layer on the outer surface. The exposed adhesive can then be bonded directly to the interior surface of the recessed window, thereby securing the flashing member in place as shown in FIG. 4 . To ensure that the corner flashing member is securely secured in the corner of the window, preferably only the release sheet is removed one piece at a time so that the corner flashing member can first be secured to the frame member 22 forming the window opening. Once the flashing member has been adhered to the frame member and/or nailed fins of the window, the remaining release sheet can be removed so that the corner flashing member can be secured to the surface of the recessed sill 24 and the window side wall 26. On the surface. As can be seen from FIG. 3 , the flashing material may also extend and wrap around the corners of the recessed sill surfaces and window sidewall surfaces to cover a portion of the exterior wall 28 . Typically, fasteners F such as nails or staples are installed through the flashing material to secure it to the exterior wall. Typically, the flashing material on the exterior wall also extends at least 2 inches from the recessed sill surface and side wall surface of the recessed window opening. As depicted in FIG. 1 , seal 20 extends outwardly in a roll-up fashion, but may be attached to surface 10a (or 10a') for convenience, as shown in FIG. 4 .

Claims (6)

1. method that is used for the re-entrant angle of building is carried out waterproof, described method comprises:

Splash guard material bar is provided, and that described splash guard material bar comprises is flexible, suitable waterproof top flat shape, pliable and tough, and described waterproof top flat is being not more than the extension that has under the applied stress of 10N/cm at least about 150%; Cover the pressure sensitive adhesive layer on a surface of described top flat, described layer has the extension that is equal to described top flat under the applied stress that is equal to; Be attached to the residual plate on the described adhesive phase removedly, described residual plate has the vertical perforation that described residual plate is divided into the cross-perforating of two major parts and described residual plate is divided into marginal portion and bulk part; Remove the gable of described residual plate, wherein said gable is by the isosceles triangle shape of the cross-perforating of described residual plate to dividing, wherein said triangle has 90 ° angle in the confluce of described vertical perforation and described cross-perforating, and, thereby expose the gable of described adhesive phase along the edge angle at 45 of the described marginal portion of described residual plate; Along the folding described splash guard material of described cross-perforating, thereby the adhesive phase that links the exposure on the relative both sides of described fold line makes the adhesive phase of described exposure contact continuously; Along the folding described splash guard material of described cross-perforating between described topsheet surface, forming the right angle, and along the folding described splash guard material of described vertical perforation between described topsheet surface, forming the right angle, thereby form the splash guard member of turning shape; Remove remaining residual plate to expose remaining adhesive phase from described turning shape splash guard member; And the residue adhesive phase of described exposure is attached on the described re-entrant angle surface, thereby described turning shape splash guard member is fixed on the installation site.

2. method according to claim 1, wherein said adhesive are the bituminous cement or the butyl adhesive of rubbery.

3. method according to claim 1, wherein said top flat are continuous films, Woven fabric, non-woven material or their layered product.

4. splash guard member, described splash guard member comprises the one that conforms to the re-entrant angle in the architectural openings from adhesion tablet, does not wherein need fastener that described member is remained in the described re-entrant angle.

5. that splash guard member according to claim 4, described splash guard member comprise is flexible, suitable waterproof top flat shape, pliable and tough and pressure sensitive adhesive layer.

6. splash guard member according to claim 5, described splash guard member be included in described top flat facing surfaces on be attached to adherent layer on the described varistor layer.

Images