Prime existing roof surface with bitumen primer and allow to dry. Repair small areas with a rough gravel surface with 3mm base sheet.
Torch apply to primed surface one layer of 4mm thick Viking Gemini APP modified Grey granule surfaced membrane, forming to shape of gutters and dress over the outside fascia 100mm.
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Remove existing metal roof. Layer of new Heavy Weight Bituminious Paper Underlay.
0.55mm Steel & Tube Roofing Trimline Trapizoid profile Titania Coloursteel Endura sheet metal roofing fixed matching colour Timbertite screw fixings. Matching side barge and top end apron flashing, then install new piece of roof membrane down over from main roof to seal.