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The two most familiar types of flat roof waterproofing are: "Hot Applied" – The build up of one or more layers of molten bitumen and roofing felt to create an impervious membrane, sometimes involving the direct use of flamed torches to heat the bitumen to the required temperature. This process gives off noxious bitumen fumes and has an associated fire risk through the use of boilers or torches on the building itself. ‘Cold Applied’ – this method avoids the use of heat or flames and instead uses specialist ‘cold liquid’ resins to impregnate a fleece−based substrate which then cures to provide a waterproof membrane. Solvent−based systems are rapid−setting but may give off fumes whilst curing. Kemper are the only cold−liquid manufacturer offering a solvent−free alternative, 2K−PUR, which make it particularly suitable for the repair of roofs on schools, hospitals and other occupied buildings. |
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