Cavity Trays explains how to eliminate the negative effects of Pigs and Gorrets.
Pigs and Gorrets are regional terms used to describe a deviance in level between the two skins of a cavity wall. According to textbooks they should not occur, as every three bricks laid in the outer leaf should match the height of one block laid on the inside skin. But this is often different in reality. It is more common for skins to drift out of level and the problem is known by many names in addition to the above.
The use of a conventional DPC within a cavity wall at changes of level and abutments can be problematic at the best of times – but when the masonry skins are out of alignment the position is even worse. These problems can be banished by using warranted preformed Cavitrays from Cavity Trays.
Cavitrays are self-supporting, so building into the inside skin is not required. At what height the inside skin coursing occurs makes no difference, Cavitrays still function. The same applies if the cavity width varies, as the upstands are hinge-biased to take up the as-found cavity dimension, promoting compatibility and conformity. Importantly, there is no distortion, sagging, misshaping, damage or puncturing as every tray is moulded and thus correctly profiled.
Preformed Cavitrays are accompanied with a performance warranty and can design out risk by banishing pigs and gorrets. Cavity Trays is based in Yeovil, Somerset and is the only UK tray manufacturer awarded European Technical Approval. Applications, include sloping and horizontal abutments, parapets, balconies, circular and horizontal openings, existing walls, Caviclosers, weeps and vents, concave and convex cavity walls, as well as enlarged advisory service openings.