NZ550386A - Recessed internal corner flashing - Google Patents

Abstract

An internal corner flashing of a single length of material with six faces A to F and bent with five lengthwise parallel folds substantially as illustrated. Going around the section of the profile from one face to the next, A to B is bent 45 degrees in a first direction, B to C is bent 165 degrees in a second direction, C to D is bent between 90 and 135 degrees in the first direction, D to E is bent 165 degrees in the second direction, and E to F is bent 45 degrees in the first direction.

Description

Current Owner: Your reference: Anthony David Kennedy Recessed Internal Corner Flashing Patents Act 1953 MEEjLLECTUAL PROPERTY OFFICE OF N.Z. 2!, DEC 2007 RECEIVED ,r\ Patent Form No. 5 - Complete Specification (*) No. ... Date: 550386 October 2006 Recessed Internal Corner Flashing 1 /h\ Anthony David Kennedy, 15 Carlyon Road, RD1, Upper Moutere, HelsonVl^ew'ZeMmdi^ew^ZeaTander) hereby declare the invention, for which I (or we) pray that a patent may be granted to me (©wis), and the method by which it is to be performed, to be particularly described in and by the following statement (c) continue application on page 2 Continued over...

For assistance completing this form please call 0508 4IPONZ (0508 447 669) (c) Complete Specification This invention relates to a recessed internal corner flashing for use in the construction of buildings with exterior wall claddings other than masonry veneer. Such wall claddings can be either direct fix or over a cavity.

The objectives of the invention are: ♦ to prevent any moisture that gets behind a building's exterior wall cladding at an internal corner in the exterior walls, from getting onto the wall framing, ♦ to direct any moisture that gets through to the flashing, downwards via drainage channels and away from the building, and ♦ to avoid any distortion in a building's rigid exterior wall cladding where it covers the flashing.

In the past a number of different flashing designs have been used to achieve some of the objectives above with varying degrees of success. 1. A length of metal or pvc with one 90 degree lengthwise fold. While such a flashing will prevent moisture that gets behind a building's exterior wall cladding from getting onto the wall framing at the corner, it does not prevent such moisture from tracking onto the framing at the edges of the flashing through capillary action, as there is no gap between the flashing and the wall cladding and no means of diverting any moisture away from the wall framing. 2. A length of metal or pvc with one 90 degree lengthwise fold with a ridge or protrusion running down each lengthwise edge of the flashing. The purpose of this ridge or protrusion is to create a gap between the flashing and the exterior wall cladding to try to prevent capillary action tracking moisture from the flashing to the building framing. However the ridge or protrusion does not provide a sufficient gap between the flashing and the wall cladding to prevent the capillary action and thus moisture tracking onto the building framing. This flashing design has the added disadvantage of protruding from the flat surfaces of the flashing, thereby creating a distortion in any rigid exterior wall cladding where the cladding covers the flashing. The greater the ridge or protrusion in order to try to provide a sufficient gap to avoid capillary action, the greater the distortion in the external cladding. 3. A length of metal or pvc with a 90 degree lengthwise fold Mid a 180 degree lengthwise fold 5mm to 10mm from each edge of the flashing. The purpose of the 180-degree folds is to form hems to try to prevent any capillary action tracking moisture from the flashing to the building framing and diverting such moisture downwards via these hems. This design is more effective than other designs in preventing moisture from tracking onto the framing but because the gaps provided by the hems are small, capillary action operates inside the hems and moisture can be held there. The hems therefore are not very effective in directing moisture away from the building. This flashing design again has the disadvantage in that the hems protrude from the INTELLECTUAL PROPERTY OFFICE OF N.Z 2 2 9 JAN 2008 RECFivpnl flat surfaces of the flashing, thereby creating distortions in any rigid exterior wall cladding where the cladding covers the flashing.

Fig. 1 shows the dimensions and angles of the recessed internal corner flashing. Fig. 2 shows a sketched outline of the flashing, which can be made to any length. Fig. 3 shows one example of how the flashing, in use, can be positioned at a building's internal corner in its exterior walls.

The recessed internal corner flashing is made from a single length of metal or other material and comprises 5 lengthwise folds, which run parallel to each other and the longitudinal edges of the flashing as shown in Fig. 2. The first lengthwise fold (Angle A-B) forms a 45-degree angle. The second lengthwise fold in the opposite direction (Angle B-C) forms a 165-degree angle. The third lengthwise fold (Angle C-D) forms an angle that can range from 90 degrees to 135 degrees and is in the same direction as Angle A-B. The fourth lengthwise fold (Angle D-E) forms a 165-degree angle and is in the same direction as Angle B-C. The fifth lengthwise fold (Angle E-F) forms a 45-degree angle and is in the same direction as Angles A-B and C-D.

The recessed internal corner flashing dimensions can vary depending on the desired coverage area of the flashing, but typical dimensions as shown in Fig. 1 would be - face A: 5mm -10 mm, face B: 20mm - 30mm, face C: 50mm minimum, face D: 50mm minimum, face E: 20mm - 30mm, and face F: 5mm -10 mm.

Figure 3 shows how the flashing, in use, is positioned vertically behind the exterior wall cladding at a building's internal corner junction in its exterior walls. Any moisture getting through the wall cladding at the corner junction is diverted via the flashing's drainage channels, formed by angles A-B and E-F (Fig. 1), and prevented from getting beyond the flashing onto the wall framing. The dimensions of these channels provide a sufficient gap between the flashing and the exterior wall cladding to prevent any capillary action from tracking any moisture from the flashing onto the building's wall framing. Instead, any such moisture is diverted downwards and away from the building via the drainage channels in the flashing. However the main advantage of this particular design of internal corner flashing is that faces E and B are angled so that the ends of the flashing are in line with flashing faces C and D as shown in Fig. 1. This means that the exterior wall cladding, which is positioned against faces C and D, is not distorted as often happens with other internal corner flashing designs. It also means that the flashing is not distorted by the wall cladding. This design will be of most benefit where the external wall cladding is in the form of rigid panels or sheathing such as weatherboards, sheet claddings or profiled metal claddings.

Such claddings will show distortion where the surfaces against which they are fastened are uneven or have protrusions.

Where a building's exterior wall cladding is fixed over a cavity, as shown in Fig. 3, cavity battens will sit behind the flashing with the flashing drainage channels (angles A-B and E-F) overhanging the battens. In a direct fix situation where there is no wall cavity, the building's corner studs will sit behind the flashing with the drainage channels overhanging the studs. In this situation the framing 3 / 2 9 JAN 2008 j LRECEIVEdI

Claims (4)

dwangs and plates may need to have a groove chiselled into them to accommodate the drainage channels. The recessed internal corner flashing can be made from a variety of materials depending on the location of the building in which it is used, the durability requirements of the flashing and the proximity of the flashing to certain other materials. The materials used will preferably be in accordance with Paragraph 4.0 of Acceptable Solution E2/AS1 in relation to external moisture, and be selected according to the durability requirements of Table 20 and the compatibility with contact materials and run-off as per Tables 21 and 22 of E2/AS1. WHAT I CLAIM IS

1. A flashing, comprising a single length of material with five lengthwise folds running parallel to each other and parallel to said flashing's longitudinal edges giving 6 external faces, and as one progresses around the perimeter of the profile of the flashing, the first said lengthwise fold is bent to form an angle of 45 degrees between the first and adjacent second face, the second said lengthwise fold is bent to form an angle of 165 degrees between the second and adjacent third face and is bent in the opposite direction to the said first lengthwise fold, the third said lengthwise fold is bent to form an angle which can range from 90 degrees to 135 degrees between the third and adjacent fourth face and is bent in the same direction as said first lengthwise fold, the fourth said lengthwise fold is bent to form an angle of 165 degrees between the fourth and adjacent fifth face and is bent in the same direction as said second lengthwise fold, the fifth said lengthwise fold is bent to form an angle of 45 degrees between the fifth and adjacent sixth face and is bent in the same direction as said first and third lengthwise folds.

2. A flashing as claimed in claim 1 wherein the flashing in use is positioned vertically behind a building's exterior wall cladding at an internal corner junction in said building's exterior walls to prevent any moisture that has entered through the exterior wall cladding via the internal corner junction from coming into contact with the building's wall framing.

3. A flashing as claimed in claim 1 wherein the flashing in use is positioned as claimed in claim 2 to divert any moisture that has entered through the said exterior wall cladding via the said internal corner junction, downwards via channels in the flashing, formed by the said first and fifth lengthwise folds.

4. A flashing as claimed in claim 1 wherein the flashing in use is positioned as claimed in claim 2 to prevent any moisture that has entered through the said exterior wall cladding via the said internal corner junction, from tracking from the flashing onto the said building's wall framing as a result of capillary action, by providing a gap between the flashing and the exterior wall cladding in the form of channels in the flashing formed by the said first and fifth lengthwise folds. 4 / 2 9 JAN 2008 I D ».. I 6. A flashing as claimed in claim 1 or claim 2 wherein the flashing incorporates channels as claimed in claim 3, said channels so formed that the longitudinal edge of the said first face of the flashing is on the same plane as the said third face and the longitudinal edge of the said sixth face of the flashing is on the same plane as the said fourth face so that no part of each channel protrudes beyond the adjacent flashing face that is in contact with the said external wall cladding, avoiding any distortion in either the flashing or the exterior surface of said external wall cladding at or within approximate vicinity of said internal corner junction. A flashing as claimed in claims 1, 2, 3, 4 and 5 wherein the flashing in use is positioned so that a) the said third and adjacent fourth faces of the flashing, forming an angle, which can range from 90 degrees to 135 degrees, are positioned against internal faces of the said building's exterior wall cladding b) the reverse sides of the said third and adjacent fourth faces are positioned against vertical cavity battens where the wall cladding is fixed over a cavity, with channels in the flashing formed by the said first and fifth lengthwise folds, protruding into the cavity c) the reverse sides of the said third and adjacent fourth faces are positioned against wall framing where the said building's exterior wall cladding is fixed without a cavity, with channels in the flashing formed by the said first and fifth lengthwise folds, positioned into grooves cut into horizontal framing as required d) the said longitudinal edges of the flashing are positioned against internal faces of the said building's exterior cladding. A flashing substantially as described and as illustrated in the accompanying diagrams. 5