Asphalt Flat Roof Details

However over the last few decades new and advanced materials have been developed.

Asphalt flat roof details.

From there the flat roof system you choose will determine the materials you apply. The hot applied asphalt or coal tar pitch blends with the bitumen soaked roof felt and creates a monolithic roof membrane. Most flat roofs are typically not as long lasting or durable as sloped ones because the latter shed snow and rain a lot quicker. Rainer barthel 1 loadbearing structure matthias beckh mark.

The roof felt asphalt tar layering is repeated in overlapping layers until the assembly is two to fours plies in thickness. It must provide adequate protection against the elements keeping the buildings structure and interior dry. Liquid applied membrane systems require rigorous preparation of the substrate which must be dry and dust free with patched cracks. Other flat roof components underneath the basics flat roofs are usually constructed with a ceiling nailed to joists which support a deck usually wood in residential construction a vapor barrier insulation and a roof board.

A classic flat roof is either almost completely level or has a very slight pitch of 3 in 12 inches or less. Mastic asphalt is waterproof and is made from bitumen and withstands the weather extremely well. Waterproof membrane with a protective covering this should prevent water reaching the roof structure and the room below. Sbs or modified asphalt mineral surfaced roll roofing membranes are based on sbs a synthetic rubber that gives improved performance over traditional asphalt saturated felt.

The evolution of the flat roof christian schittich. Problems we have seen with asphalt roof deckings. Commonly used for commercial roofing jobs the asphalt is melted poured and spread while hot. This is a hazardous job best left to professionals.

As outlined in the manual liquid applied membrane roofing includes hot and cold polymer modified asphalt single component asphalt or coal tar extended urethane and two component urethane elastomer. A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less. A flat roof must be strong durable and stable throughout its lifetime. For flat roofs slope less than 2 12 you should not be installing roll roofing but rather you should use a flat roof system such as app or sbs modified roofing or epdm rubber roofing see details for flat roofs.

Free phone 0800 298 5424. A flat roof is a multi layer construction typically comprising of the following elements.