3 layer GRP fibre glass system in Stockport. 18mm OSB boarding was installed with inlayed gully section to front perimeter and a lead welded internal outlet point fitted through the gully. We then fitted all preformed trims to outer perimeter and around roof lantern before bandaging joints and corners. The 1st layer was then installed, comprising activated liquid resin and sheet roll fibre glass matting. Once cured we then coated the whole roof and trims in activated liquid topcoat, calling back to fit lead flashings to rear wall and giving the whole area a further layer of activated topcoat.