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Harcon Vapour Underlay 1.5MTR x 50MTR
VAPOUR PERMEABLE ROOFING UNDERLAY
Installation guide (typical unsupported Roof Application
Unroll Harcon VPU across the roof parallel to the eaves and drap harcon VPU over the rafters
Start at the eaves. Harcon VPU should not be laid into the gutter. Fit a Eaves tray and dress Harcon VPU onto the eaves tray itself
Lay subsequent rolls with correct horizontal and vertical laps as shown in BBA certificate number 04/4145.
Harcon VPU is marked with a 150mm lap line, which is the correct lap for uyse on a 150-35° unsupported roof system. For other roof pitches or supported roofs see table below
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Installation Guide (Full Supported Roof)
Harcon VPU can aloso be used in fuilly supoprted roof systems, in this situation it must be fixed using countre battens at least 12mm deep to ensure an adaquate airspace for drainage and ventilation
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