Synthetic flashing from Cavity Trays
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Cavity Trays is offering its alternative to lead flashing, either ready-attached to its trays or in roll form for fabrication on site.
The material does not have a scrap value, and is proving popular in many locations throughout the UK.
When evaluating synthetic flashings, Cavity Trays wanted to identify a medium that not only looked like lead, but dressed like it also.
The company looked for a material that had a thickness no less than that of code 4 lead, and could be handled in much the same way.
Many materials were dismissed because their resilience and ability to behave in wet and windy conditions did not meet expectations.
After years of investigation, Cavity Trays now offers a synthetic flashing, and challenges comparison with alternatives.
When dressed, the material is ductile.
Unlike lighter less malleable flashing materials, it does not spring or flap.
Several colours are available so the flashing can blend in with numerous wall and roof finishes.
If a conventional lead flashing look is required, then the grey synthetic flashing provides it - but without the accompanying scrap value exposure.
The synthetic flashing has been granted a BBA certificate and extends the options available to the specifier of attached-flashing products and rolls offered by Cavity Trays of Yeovil.
Type BA Cavity Barrier Arch cavitrays from Cavity Trays have been designed for use in shaped rather than horizontal cavity walls to provide opening protection. Type BA cavitrays offer total protection to the angled head, extending upwardly and outwardly to prevent the build up of concentrated water wash.
New Pyramid Weep for cavity masonry download
The new Pyramid Weep for cavity masonry from Cavity Trays replaces traditional reed straw systems. Triangular in profile, the new weep provides an aesthetically neutral means of removing water that may permeate a structure. The possible flow width of the weep is maximised due to its flat base which also allows it to bed as flat and low as possible to service water evacuation from lintels, dpc’s and trays. The Pyramid Weep is manufactured using PVCu and, as a result, will not rot.
Cavity Trays is reporting that cavity walls that support an opening using separate lintels will improve the overall thermal performance of the structural opening as the lintels do not connect and therefore do not conduct heat loss. Using this method alongside a self-supporting Cavitray and an infilling profile Cavistock enhances performances levels even further. This arrangement can promote a lintel value of up to 0.05W/mk.
Cavity Trays movement challenges the lastest British Standard PD 6697: 2010 detail that results in the entire parapet masonry above the DPC being separated from the masonry below the DPC and is not the ideal structural arrangement for a highly exposed wall at the top of a building. They outline why the use of preformed self-supporting Type P parapet cavitray is the preferred option.
Cavity Trays, already the only UK manufacturer of preformed cavitrays to hold European Technical Approval, has now secured additional approvals from LABC Registered Details (Local Authority Building Control) for preformed curved and straight cavitrays plus its extensive range of Cavicloaks.