GB2371568A

GB2371568A - Cavity wall tray

Info

Publication number: GB2371568A
Application number: GB0101899A
Authority: GB
Inventors: Martyn Hamer
Original assignee: Jack Hamer & Sons Ltd
Current assignee: Jack Hamer & Sons Ltd
Priority date: 2001-01-24
Filing date: 2001-01-24
Publication date: 2002-07-31
Anticipated expiration: 2021-01-24
Also published as: GB2371568B; GB2371568B8; GB2371568A8; GB0101899D0

Abstract

A self supporting cavity wall tray can be inserted through a single cut in the masonry of a wall. The tray comprises a rectangular sheet having a front edge, a back edge, two side edges, a top surface, a bottom surface and a bend parallel to the front and back edges. The bend divides the tray into a rectangular front portion and a rectangular back portion. When the tray is positioned with the bottom surface facing downwards and the front portion of the tray horizontal, the back portion of the tray extends at an angle of 3.5 degrees above the horizontal. The back edge of the tray and the side edges of the back portion of the tray are folded over onto the top surface of the tray to form a lip to prevent water running off the back portion of the tray. The side edges of the front portion of the tray are folded under onto the bottom surface of the tray. A 10 mm wide strip along the front edge of the tray is folded down perpendicular to the front portion of the tray to form a drip edge. The tray may have integral flashing, in which case the folded down front edge portion of the front portion of the tray is approximately 100 mm wide.

Description

CAVITY WALL TRAY The invention relates to a cavity wall tray, of the type which can be found in most buildings for the prevention of water ingress via the cavity over window and door openings or any position where the cavity has been breached.

Cavity trays are well known throughout the construction industry and are usually installed in the building process as an integral part of the construction. The cavity tray is usually made from UPVC or it can be made on site in lead. Should a cavity tray fail or if it is not built in during construction, remedial installation can be a lengthy and costly job involving removal of brickwork or masonry in the area concerned to give access for the installation of the cavity tray. Once the tray has been installed the brickwork and masonry then need to be reinstated and made good Essentially the tray is there to prevent ingress water entering the building via the cavity.

An object of this invention is to save the lengthy and costly process of installing a traditional cavity tray by allowing a self supporting cavity tray to be installed directly through a single cut in the brickwork or mortar joint on either an horizontal or angled plane.

Accordingly this invention provides A cavity tray wk,-K can be fitted in a fraction of the usual time required with minimal cosmetic damage to the surrounding brickwork or masonry. The cavity tray can be installed by semi-skilled operatives and is a self supporting tray designed mainly as a remedial cavity tray, but adaptable to be used also in new build construction. The tray comes in two forms, the standard form for general applications as previously mentioned, and the integral flashing form for applications where an integral flashing is required, for example where two buildings intersect, such as a new conservatory building or over and existing roof elevation.

The cavity tray is to be fabricated from metal such as aluminium or plastisol (Plastic coated steel) depending on availability on application.

The tray has a built in edging at the rear to prevent water running off at the rear instead of at the end of the tray or via the weep holes to be fitted during installation. The cavity tray also has a front edging to prevent water ingress under the tray and additionally to form a drip edge.

The preferred versions of the cavity wall trays previously mentioned will now be described with reference to the accompanying drawings.

With reference to Fig. I : No. 1 shows edge of tray at rear folded over on to top edge to create a stop for ingressed water. This edge to be approx. 5mm along full length of tray and returning 25mm at each end towards the front.

With reference to Fig. 2: No. 2 shows front edging on the standard tray. Edging to run full length of tray and be approx.

I Omm deep.

No. 3 shows point of tray where angle varies to rise approx. 3.5 degrees off the horizontal.

This rise in the rear section of the tray assists ingressed water away from the interior wall and towards the front or either end where it can escape.

With reference to Fig 3 : No. 4 shows the front edge on the integral flashing tray. This is different from the standard tray by its means if length The length of the integral flashing is 100mm instead of 10mm as is

the case on the standard tray. This is to allow a flashing facility incorporated into the tray for the relevant applications. (4) Additional information regarding jointing multiple trays together for longer Applications : Trays can be joined simply by folding lower fold on each end of tray to form a stop on upper surface and make each tray an individual sealed unit. Trays to be overlapped approx 10mm and weep joint to be fitted either side of joint in adjacent perpendicular joints.

See drawing No. 4

Claims

CLAIMS I) A self supporting cavity tray which is designed to be inserted into a single cut in an existing wall which can vary in length and be joined to an adjacent tray for longer applications.

2) A cavity tray for the purpose of prevention of water ingress into a building via the cavity wall 3) A cavity tray which may be fabricated from a variety of materials i. e. aluminium or plastisol (plastic coated metal) are the preferred materials but UPVC or polycarbonate materials may also be used.

4) A cavity tray which can be fabricated in various colours to match its intended surroundings. Red, brown and beige or buffbeing the most popular shades of masonry.

5) A cavity tray which can be fabricated in two forms-the standard form and the integral flashing form for the appropriate applicants.

6) A cavity tray which has a drip stop edging on its rear edge and a slight angle variation for the purpose of dispensing ingressed water (No. I on drawing Fig. I) 7) A cavity tray which has a drip edge on its front section to prevent water ingress under the said tray and to form a drip edge for weather purposes. (No. 2 on Fig. 2) 8) A cavity tray with a slight upward bend at its rear edge (No. 3 Fig 2)