Installation of new C16 grade 50mm × 100mm timber spars, timber firrings to give the new roof deck the correct flow 18mm Sterling OSB roof boards. Install new timber upstands at the verges. Install new timber drip edge, Classic Bond 1.2mm single ply rubber membrane cap sheet, white UPVC fascias, black UPVC half round guttering, brackets, unions, stop ends, running outlet, black UPVC round downpipe, brackets, off set bends and shoe, white UPVC trims at the drip edge and 150mm textured coated aluminium flashings at the abutment walls