Built Up Felt Roofing

Built up bituminous membranes are probably the most economic and common form of roof covering material for domestic flat roofs. They can be used on timber, metal and concrete decks.

Today’s high performance felts are reinforced with polyester or glass or a mixture of the two, and are coated and impregnated with bitumen.

High performance felts are supplied in rolls and can be laid in two layers bonded together with hot bitumen. The multiple layering reduces the risk of failure as any damage in one layer will usually be covered by the next layer.

The felt membrane can either be partially or fully bonded to the substrate. The pour and roll and torch on technique will provide a full bond, this has the advantage of providing a high level of resistance to wind uplift and ensuring no flow path for water is provided under the membrane which could cause moisture to become trapped and blister the membrane.