Battens required (net, roof): 2.9 lin.m/m2 at 75mm headlap 3.1 lin.m/m2 at 100mm headlap
Batten size recommended: 38mm x 25mm for rafters/supports not exceeding 450mm centres (fixed to BS 5534) 50mm x 25mm for rafters/supports not exceeding 600mm centres (fixed to BS 5534)