NZ540022A - 12mm internal box corner flashing - Google Patents

Abstract

A metal flashing, comprising a single length of metal with nine length-wide folds running parallel to each other and parallel to said flashing's longitudinal edges giving 10 external faces, first said length-wide fold bent at 180 degrees to form a hem, second and third said length-wide folds each bent at 90 degrees in the same direction as said first length-wide fold, fourth, fifth and sixth said length-wide folds each bent at 90 degrees in the opposite direction to said first, second and third length-wide folds, seventh and eighth said length-wide folds each bent at 90 degrees in the opposite direction to said fourth, fifth and sixth length-wide folds, ninth said length-wide fold bent at 180 degrees in the same direction as said seventh and eighth length-wide folds to form a hem.

Description

Please return form by mail to: 54 0022 Intellectual Property Office New Zealand PO Box 30 687 Lower Hutt New Zealand *10052298480* You can confirm the details of registered Intellectual Property at www.iponz.govt.nz IP number/s: 540022 -Office use only- Current Owner: Anthony David Kennedy INTELLECTUAL PROPERTY OFFICE OF N.Z. 1 5 AUG 2006 RECEIVED Your reference: 12mm internal box corner flashing Patents Act 1953 Patent Form No. 5 - Complete Specification (*) No 540022 Date: 2005 12mm internal box comer flashing I (or Wc) (b) Anthony David Kennedy, 15 Carlyon Road, RDl, Uj)per Moutere, Nelson, New ZealMd(New hereby declare the invention, for which I (or wo) pray that a patent may be granted to me (or uo), 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 Total Fee Paid NZ$ 281.25 T elephone (03) 543-2145 Email anne@quickflash.co.nz Credit card - Please complete Credit card authorisation Direct Debit - Please provide Customer ID Number Customer Number Cheque - Made out the Ministry of Economic Development Your receipt will be automatically emailed to you. Please tick this box if you wish to receive a receipt by post Continued over.

For assistance completing this form please call 0508 4IPONZ (0508 447 669) intellectual property office of n.z. 2 9 SEP 2006 (c) Complete Specification I received This invention relates to an internal box corner flashing for use in the construction of residential dwellings that have sheet cladding or weatherboard external veneers. Such wall claddings can be either direct fix or over a cavity.

The objectives of the invention are: • To form a neat join where sheets of exterior wall cladding or weatherboards meet at an internal corner in a building's exterior walls, with only a small area of the flashing visible.

• To hold sheets of exterior wall cladding or weatherboards in place at an internal corner in a building's exterior walls, allowing room for expansion and contraction of the sheets or weatherboards, thus reducing the risk of the external veneer buckling or cracking.

• To protect the ends of sheet wall claddings or weatherboards from the elements, thus reducing the risk of distortion.

• To act as a back flashing to prevent moisture from getting in behind the external wall cladding where sheet claddings or weatherboards join at an internal corner of a building's exterior walls.

In the past, a number of different methods have been used to attempt to achieve some of the above objectives. 1. Box flashings made out of extruded aluminium have been used to hold sheet claddings or weatherboards in place at an internal corner in a building's exterior walls. Aluminium extrusion is generally a minimum of 2 mm in thickness, compared with other metals commonly used for flashings, which when compliant with Approved Document for New Zealand Building Code Clause E2 - Acceptable Solution E2/AS1, generally range from 0.45mm to 0.55mm in thickness. This means that flashings made from extruded aluminium can cause distortion in sheet claddings and weatherboards that are fastened over them. Because the invention is made from considerably thinner metals than aluminium extrusion, it can accommodate hems where the metal is folded back on itself to prevent moisture from tracking from the flashing onto d building's wall framing behind the exterior wall cladding. Box flashings made from extruded aluminium do not contain this feature.

Another disadvantage with extruded aluminium box flashings is that they cannot be overlapped, both because of their design and the thickness of the extrusion. This means that where such flashings are joined there is a risk of water getting in behind the flashing. The design of the internal box corner flashing and the thickness of the metals used allow the flashing to be overlapped and accordingly the weather tightness is not compromised. 2. Corner flashings have also been used to hold sheet claddings or weatherboards in place, both with and without back flashings behind the external claddings. The advantages of the invention over this method are that only one flashing is required and less flashing is visible than when a corner flashing is used. Because a corner flashing is fastened to the outside of a building's exterior wall claddings the fixings are visible. This is not the situation with the invention. Accordingly the invention provides a neater, more attractive finish than the corner flashing option. Lastly if a back flashing is not used with a corner flashing the level of protection from 2-' moisture provided to a building's framing is considerably less than that provided by the invention. 3. A strip of timber is another means used to hold sheet claddings or weatherboards in place at an internal corner in a building's exterior walls. This method was often used with a back flashing behind the exterior wall cladding to prevent moisture from getting further in behind the cladding. While a strip of timber is an effective means of holding the exterior cladding in place at an internal corner, it is not as durable or weather resistant as the metal of the invention and the latter provides a neater, more attractive finish. 4. uPVC box flashings have also been used in the past. The design of the invention and the fact that it is made from metal mean that it provides a much more robust, durable and rigid option than uPVC flashings. Also uPVC flashings cannot be overlapped because of both their design and the thickness of the uPVC. This means that where such flashings are joined there is a risk of water getting in behind the flashing. The design of the internal box corner flashing and the thickness of the metals used allow the flashing to be overlapped and accordingly the weather tightness is not compromised.

Fig. 1 shows a sketched outline of the internal box corner flashing, which can be made to any length.

Fig. 2 shows the dimensions and angles of the flashing.

Fig. 3 shows how the flashing is used at a building's internal corner in its exterior walls where a sheet cladding or weatherboard external veneer is used.

The internal box corner flashing is made from a single length of metal and comprises 9 length-wide folds, which run parallel to each other and the longitudinal edges of the metal as shown in Figs. 1 and 2. As shown in Fig. 2 the first fold (angle 1-2) is a 180-degree angle so that faces 1 and 2 are parallel to each other to give a hem. The flashing then angles down at 90 degrees in the same direction (angle 2-3), and then again at a further 90 degrees in the same direction (angle 3-4) with face 4 running parallel to face 2. The next three folds (angles 4-5, 5-6, and 6-7) are also at 90 degrees but in the opposite direction to the previous folds. The last 3 folds (angles 7-8, 8-9 and 9-10) are in the same direction as the first three folds and are 90 degrees, 90 degrees and a 180-degree hem respectively.

The internal box corner flashing dimensions can vary depending on the thickness of a building's exterior wall cladding, but typical dimensions as shown in Fig. 2 would be - face 1:10 mm, face 2: 50mm minimum, face 3: 6mm - 40mm, face 4:10mm - 20mm, face 5: 20mm - 50mm, face 6: 20mm - 50mm, face 7: 10mm - 20mm, face 8: 6mm - 40mm, face 9: 50mm minimum and face 10: 10mm. Faces 1 and 10 will be the same length as each other, as will faces 2 and 9, faces 3 and 8 (unless the cladding on adjacent walls is different), faces 4 and 7 and lastly faces 5 and 6 so that the flashing is a symmetrical shape.

The internal box corner flashing can be made from a variety of metals 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 metals 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 - 3"- intellectual property office of n.z. 2 9 SEP 2006 RECEIVED

Claims (5)

the durability requirements of Table 20 and the compatibility with contact materials and run-off as per Tables 21 Mid 22 of E2/AS1. Fig. 3 shows how the internal box corner flashing can be used at a vertical internal comer junction in a building's exterior walls where sheet wall claddings or weatherboards meet. Some details may vary depending on the thickness of the building's exterior wall cladding. In this instance the internal box comer flashing is positioned at a junction where sheet cladding meets and the U-shaped channels formed by faces 2-3-4 and faces 7-8-9 are used to hold and protect the ends of the sheet cladding. The ends of the sheet cladding are positioned in these channels to provide sufficient room for expansion and contraction of the veneer in changing temperatures and weather conditions. The reverse sides of faces 2 and 9 are positioned against and fastened to the buildings vertical cavity battens on their respective walls. However, in a direct fix situation where there is no wall cavity, the flashing is fastened to the building's framing. Faces 1 and 10 are folded so as to form hems to prevent any moisture tracking from the flashing into the wall cavity or onto the building's framing. Faces 5 and 6, which are positioned facing outwards from the building at right angles to each other and the adjacent walls of the building, are the only visible faces of the flashing in use and provide a neat, clean finish to the internal comer of the building. The combination of the detailed shape of the flashing and the hems at both ends prevents moisture from getting in behind the wall cladding at this internal comer junction. WHAT I CLAIM IS

1. A metal flashing, comprising a single length of metal with nine length-wide folds running parallel to each other and parallel to said flashing's longitudinal edges giving 10 external faces, first said length-wide fold bent at 180 degrees to form a hem, second and third said length-wide folds each bent at 90 degrees in the same direction as said first length-wide fold, fourth, fifth and sixth said length-wide folds each bent at 90 degrees in the opposite direction to said first, second and third length-wide folds, seventh and eighth said length-wide folds each bent at 90 degrees in the opposite direction to said fourth, fifth and sixth length-wide folds, ninth said length-wide fold bent at 180 degrees in the same direction as said seventh and eighth length-wide folds to form a hem.

2. A metal flashing as claimed in claim 1 wherein the flashing in use is positioned vertically at an internal comer junction of a building's external walls to prevent moisture from entering behind wall claddings at said internal comer junction where wall claddings join.

3. A metal flashing as claimed in claim 1 or claim 2 wherein the flashing in use is positioned vertically at an internal comer junction of a building's external walls to encase and protect the ends of sheet wall claddings or weatherboards where they meet at said internal comer junction, said ends of sheet wall claddings or weatherboards so positioned within said metal flashing to provide room for the cladding to expand and contract under -4-- intellectual property 1 office of n.z. I 2 9 SEP 2006 I opT.PIVED

4.

5. changing temperatures and weather conditions, said metal flashing also providing a clean line finish to said internal corner. A metal flashing as claimed in claims 1,2 or 3 wherein the flashing in use is positioned vertically at an internal corner junction in the building's exterior walls, a) the first and tenth said external faces of the flashing positioned respectively against internal sides of sheet cladding or weatherboards of the building's adjoining walls b) the reverse sides of the second and ninth external faces of the flashing positioned respectively against cavity battens or wall framing of the building's adjoining walls, c) the ends of the sheet cladding or weatherboards fastened to said adjoining walls, held in position by U-shaped channels formed by the second, third and fourth said external faces and the seventh, eighth and ninth said external faces of the flashing, d) the fifth and sixth said external faces of the flashing, being the only visible faces of the flashing in use, facing outwards from the building, perpendicular to the building's adjoining walls, A metal flashing substantially as described and as illustrated in the accompanying diagrams. -5 " intellectual property office of n.z. 2 9 SEP 2006 RECEIVED