Ai) Felt - Built Up Felt - 3 layer of 3B (glass fibre based) bonding felt, stuck down with hot bitumen and stoned to falls (6mm limestone chippings stuck down with a cold gritting solution). Green mineral felt 'drips' stuck over Aris rails and onto cap sheet using heat.
ii) Elastomeric torchon - A top quality, green mineral faced roofing felt (high content of rubber to increase elasticity) stuck down to an underlay using heat.
B) Lead flat roofs - Ideal for bay roofs, porches, dormers etc. Code 5 lead, dressed in bays and over wooden rolls and patinated.