Guttapral roofing sheets are made from colour-saturated and formaldehyde-free bitumen. The colour is mixed with resin to prevent the colour peeling off and the colour intensity of the sheet increases after several weeks exposure to light. At Southern Timber we carry the black and green sheets in stock, red sheets can be obtained in minimum quantities of 50 sheets.
In order to guarantee a uniform quality, gutta bitumen corrugated sheets are continuously and they carry a manufacturer's 15-year guarantee for water impermeability. All gutta corrugated bitumen sheets are CE certified and comply with the European Standard EN 534:06.
The fibres, the majority of which run parallel to the corrugation, result in a high flexibility. The gutta bitumen corrugated sheets thus facilitate an optimum matching even to uneven under-constructions. This also means they must be well supported with either ply sheeting or counter-battens. High stability with low weight of 5.2kg for each sheet which measure 2.0 metres long x 0.95 metres wide.
The minmum pitch for the roof is 10 degrees; recommended counter batten spacing and full fitting instructions can be downloaded below in Adobe Acrobat pdf format.