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DAMP PROOF COURSESVisqueen Preformed cavity tray UNITsPREFORMEDUNIT——Manufactured in the UK from specially formulated, flexible co-polymer material.——Designed to simplify the damp proofing of complex cavity tray junctions.——Speeds up cavity tray installation and eliminates leakage paths.——Ensures compliance with industry recommendations and standards.——Built-in and surface fixed units available.——Free on-site service for design of project specific Preformed units.MANUFACTUREDIN THE UKIntroductionBritish Standard 5628: Part 3 codeof practice for the use of masonry(materials and components, designand workmanship) offers guidance andrecommendations on the damp proofingof structures. It recognises that thepenetration of water into the fabric of abuilding has serious consequences forthe health of the occupants and for thelong term serviceability of the structure.The numerous bridges of the cavitywall commonly require damp proofingprotection in the form of a cavity trayand where a flexible damp proof coursematerial is used, the British Standardrecognises that many common detailscannot be satisfactorily formed on siteand that preformed units should bespecified for these complex junctions.DescriptionAn integral part of the Visqueen ZedexDamp Proofing System is the range ofVisqueen Preformed Cavity Tray Units.The units simplify cavity tray detailingat columns, corners, windposts, changeof levels, etc, and so greatly reduce thetime required on site to install a cavitytray at these complex junctions.Visqueen Preformed Cavity TrayUnits are factory manufactured fromspecially formulated, tough, co-polymermaterial, which is sufficiently flexibleto accommodate normal constructiontolerances. The units can be producedfor any width of cavity and in formatssuitable to be either built-in or surfacefixed to the inner leaf.ApplicationVisqueen Preformed Cavity Tray Units aregenerally installed prior to the main runof Visqueen Zedex DPC Cavity Tray. TheVisqueen Zedex DPC Cavity Tray shouldoverlap the Preformed Unit by minimum100mm, the lap being bonded withVisqueen Zedex DPC Jointing Tape.When surface fixing, the Preformed Unitshould be bonded and then mechanicallyfixed to the inner leaf using the sametaping/fixing system as the VisqueenZedex DPC Cavity Tray.In accordance with industryrecommendations and guidance,Visqueen Zedex DPC Joint SupportBoards should be positioned beneathunsupported laps in order to providesupport for the initial formation of thebonded lap and its long term integrity.FIXING PINS FOR Masonry (SF-01)KEY: 1) Visqueen Zedex CPT DPC (preformed cloaksto suit). 2) Visqueen Fixing Strip (25x2mm, pre-drilledwith 8mm Ø holes). 3) Visqueen Zedex 100mmJointing Tape on primed, flush inner skin.4) Weepholes at 900mm centres (min 2no. peropening). 5) Visqueen HP Tanking Primer.FIXING PINS FOR INSULATION (SF-02)KEY: 1) Visqueen Zedex CPT DPC (preformedcloaks to suit). 2) Visqueen Fixing Strip (25x2mm,pre-drilled with 8mm Ø holes) Visqueen Fixing Pins at150mm centres. 3) Visqueen Zedex 100mm JointingTape. 4) Weepholes at 900mm centres (min 2 no. peropening). 5) Metal frame construction by specialist.6) Rigid insulation board. 7) Visqueen No.2 Fixings.14