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Intra weep abutment trays for brickwork

The Glidevale range includes comprehensive cavity trays designed for brick, block, or random stone external masonry walls.

They are installed at the junction where the sloping edge of a pitched roof meets a wall—that is, where the external wall becomes an internal wall below the roofline.

NHBC Standards and BS 8215 specifically recommend preformed abutment cavity trays for this application.

Features & Benefits

  • Integral roof pitch markings on brickwork trays.
  • Integral weepholes to promote active drainage.
  • Self-supporting cavity upstand avoids the need to build the tray into the internal masonry wall.
  • Fleximouth Mortar Barrier on brickwork trays provides a clear void for fitting separate roof flashings without masonry saws.
  • Corner catchment set for return abutment detailing reduces the visual impact of the return cover flashing.
  • Available with or without pitch-dedicated, factory-fitted Aluflash or lead flashings.

Downloads

NBS Specifications

Our products are listed on NBS Source with verified specification details, making it easy for architects and specifiers to add them to their projects. Browse key technical info and application guidance directly from our NBS listings.

BIMstore

Our BIM objects are available on BIMstore, ready to view and download for free. Designed with specifiers in mind, they include key data to support efficient project planning. Browse and download directly from our BIMstore listings.

Frequently Asked Questions

Where are stepped cavity trays used?

A. A stepped cavity tray is used where a sloping roof abuts an external wall. Below the roof line the external leaf of brick or blockwork becomes an internal wall. They are also required where the cavity wall is bridged, e.g. by a lintel or ducting.

Why are cavity trays required?

A. Brick and block are porous materials; therefore, water often penetrates through the outer leaf of the external wall into the cavity space and trickles down the internal face of the inner leaf. It is therefore necessary to prevent this moisture from entering the building by using a cavity tray to catch the moisture. NHBC Standards for ‘External masonry walls’ section 6.1-D6 (a) and BS 8215 ‘Design and installation of damp proof courses in masonry construction’ specifically recommend the use of preformed abutment cavity trays.

How does the cavity tray disperse the water?

A. Unlike other manufacturer’s cavity trays that require the fitting of weeps to the bottom catchment tray, all Glidevale brickwork trays have an integral bed weep allowing water to safely drain to the outer face of the external wall at each stepped tray. The Glidevale cavity tray range has been appraised under BS EN 9001, giving an independently audited and monitored assurance that the products are designed to meet their intended purpose.

How do I fit lead to an unleaded tray following installation?

A. Glidevale brickwork trays have a unique fleximouth mortar barrier on the lower leading edge of the tray which is kept attached during installation. Once installed and the mortar has set, pull the protruding tab out. This will leave enough room to fit the lead flashing without the need to rake out the joint. We advise to also seal with mastic.

I have a 150mm cavity, will the cavity trays be suitable as they will not reach the inner leaf?

A. A self-supporting cavity tray, such as Glidevale’s, must cover half of the open cavity. Typically, a 150mm cavity would have 50mm of insulation fitted to the inner leaf of the cavity, once this is fitted Glidevale cavity trays would be covering the required depth.

Should I use long or short lead flashing? Which thickness of lead would I need?

A. The length of lead flashing is dependent on the roof covering and pitch. When using a profiled tile then long lead is advised, conversely if using a flat tile or slate covering then short lead would be best. Glidevale cavity trays are supplied with code 4 lead as standard, other thicknesses are available by request. Trays are also available with factory-fitted Protect AluFlash flashing; a lightweight, aluminium based alternative to lead.

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