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Design SpecificationsDesign<strong>Cemsix</strong> corrugated sheet can be fixed to steel or timber purlins.Fixing holes should be predrilled, or self drilling self tapping top fix fixingscan be used. Fixing should be undertaken according to BS 8219:2001.PURLIN: the horizontalbars on the roof to whichthe sheets are fixedRAILS: the horizontalbars on the wall to whichthe sheets are fixedDirection of lay left to rightPrevailingWind DirectionPurlin spacings should be a maximum of 1375mmwith two fixings per purlin per sheet.
Design SpecificationsMitring schemeTo avoid having 4 layers of overlapping roof sheets,the corners of two sheets must be mitred.Each mitre must be cut straight and cleanly eitherby hand or by power saw. The angle and size of mitreis governed by the end and side lap dimensions. It isrecommended that a good quality butyl mastic stripis used to seal the overlapping sheets to provide aweatherproof join. Two corners of opposing sheetsshould be mitred the equivalent of the head and sidelap (i.e. maximum 70mm x 150mm) with a gap betweensheets of 3-6mm.150mm3 to 6mmSheets on the perimeter of the roof will have one mitre(except the first and last sheets which remain complete),all other sheets will therefore have two mitres.70mmSheets are laid from eaves to ridge one column at atime, with the side lap corresponding to the prevailingwind direction. On duo pitched roofs opposingcolumns of sheets should be installed sequentiallyto assist in locating the cranked crown (see below).150mmLaying sequence411Ridge512RidgecourseMitre613714CrankedCrown RidgeIntermediatecoursesMitre150 mm to300mm end lap310Eavescourse29Wind Direction18www.cembrit.co.uk
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