Damp Proofing

Type X Cavitray

  • High performance approved Cavitray for abutments.
  • Lead flashing BS EN 12588 secured in bosem jaw.
  • Adjusts to cavity width - ensures correct relationship.
  • Water drip bars eliminate underbase track-back.
  • Correct mortar bedding depth is also established as bar dimensions harmonise with front of tray section to aid stability and mortar integrity.
  • Integral cavitray sealing flap links with upper tray.
  • Feature on the tray end upstand arrests horizontal tracking at this vulnerable point.
  • Adjusts for cavities from 50mm up to 160mm.
  • Gusset prevents inboard water discharge.
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Introduction

The Type X Cavitray is a preformed DPC unit with an attached ready-shaped flashing. When laid in every course of a cavity wall external skin against which a sloping roof abuts, trays provide continuous stepped DPC protection running parallel with the slope. Water and dampness in the exposed masonry skin  above this stepped arrangement is prevented from gravitating  downwardly below it. This the masonry skin is wet above the roofline but remains dry where it becomes an internal wall.

The Type X Cavitray requires building into one skin only and does not interpose the inner leaf. Each tray has a hinged self-supporting cavity upstand that adjusts to suit the cavity width. This facilitates compatibility with the cavity dimension as built - as opposed to the cavity dimension as intended.

The moulded features on every tray aid swift and accurate positioning. The mason is required to set up a chalk line matching the roof pitch and build one tray into every course with its corner on the line. This simplified installation procedure ensures all trays align and are correctly distanced.

The flashing on every tray is manufactured of lead. Alternatives may be selected from our range including a synthetic flashing. Each flashing is secured to the tray and is ready shaped to suit the roof pitch.

Flashings are simply dressed when the roof finish has been completed. Short flashings are attached where dressing is over a secret gutter or soaker, and long flashings are attached where dressing is directly over a suitably profiled tile.

Type X Cavitrays are suitable for use in both traditional and timber frame construction where the course size is 75mm (Standard brickwork coursing).

If you require trays for alternative coursings or trays for masonry of greater thickness, please read the section dealing with Multi-course trays. We are able to supply to all construction dimension requirements.

European Technical Approval has been awarded to Cavity Trays Ltd for the Type X Cavitrays and other Cavitray systems within its range. No other UK manufacturer of trays holds this award.

2 It externally weatherproofs and flashes the physical roof/masonry intersection.

3 It also prevents the inside skin from becoming damp.

The high performance Type X cavitray speeds up operations on site and ensures a good and known quality of build. Type X trays are handed, to suit left hand slopes and right hand slopes. Every tray is a self-contained unit, with its own ready-shaped lead flashing attached.

Select long leads to dress directly over tiles, or alternatively short leads to dress over the upstand of a secret gutter or soaker. Unlike other systems, the Type X has an adjustable cavity upstand so it always suits the actual cavity width and is therefore always compatible. Just bed in position and flush point as the external skin is raised.

At a later date the lead flashing may be dressed. Allow one tray per course up each slope, Stipulate left hand or right hand trays. Also whether long lead or short lead flashings. The bottom of each slope usually starts with a catchment tray (or angle if on a corner). The top usually requires a ridge tray.

Use

Preformed DPC cavitray complete with an attached ready-shaped lead flashing to form a stepped cavity DPC and flashing at the abutment of a pitched roof with a cavity wall. The Type X is the only “high performance” classified Cavitray for gable abutments, and offers the builder numerous benefits. Ideal for new-build applications.

Data

  • Solid DPC petheleyne, AA.
  • Lead flashing BS EN 12588.
  • Specify pitch, lead length, handing and whether external skin is brickwork.
  • Water drip bars eliminate underbase track-back.
  • Correct mortar bedding depth is also established as bar dimensions harmonise with front of tray section to aid stability and mortar integrity.
  • Integral cavitray sealing flap links with upper tray.
  • Feature on the tray end upstand arrests horizontal tracking at this vulnerable point.
  • Adjusts for cavities from 50mm up to 160mm.