I have several quotes, some mentioning ‘Pour-and-Roll’, others suggesting ‘Torching-on’. What is the difference?
Pour-and Roll is the traditional method of laying bitumen membranes, using hot bitumen from a boiler poured onto the layer below as an adhesive for the membrane, which is rolled onto it. Products designed for Torching-on have special bitumen on the lower surface of the membrane, which is heat-activated and melted using a large & powerful gas torch, and the membrane is then rolled onto the softened bitumen. Note: It is not good (or indeed safe) practice to apply a torch flame to any flammable surface (e.g. plywood, timber edgings, below the edge of a pitched tiled roof, etc.) The torch flame can reach 1000 degrees C. Please be aware that the contractor’s insurance will not cover fires caused in this fashion – and neither will your own home insurance.
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