Flat Roof Built Up Detail

Built up roofing also called bur is the most common roofing material used on low slope roofs.

Flat roof built up detail.

It is composed of alternating layers of reinforcing fabric and bitumen asphalt and is finished with a top layer of aggregate such as stone or gravel. Built up roofs have solved the low pitch roof problem for ages a challenge that asphalt shingles could never handle. As the roof is installed more and more layers are added to increase durability and longevity hence the name built up. The insulation is immediately below the waterproofing layer.

Built up roofing going back about 120 years the grandfather of flat roofs is the built up roof or bur. From there the flat roof system you choose will determine the materials you apply. Many slope in several directions like squashed hip roofs toward scupper holes that connect to downspouts. As you might imagine this is the cheapest version possible and good for covering a shed.

Tar and gravel 2. The most important thing to know about a flat roof says tom is that it s not flat to prevent water from pooling and eventually invading the home flat roofs are always built on a slight incline at least 1 8 inch per foot. Bur is preferred for low slope or flat roofs because it creates a continuous sealed surface. The vapour control layer is above the decking but below the insulation.

They can be built up from profiled metal decks as the insulation selected would provide enough rigidity to span the open sections of such decks. It must provide adequate protection against the elements keeping the buildings structure and interior dry. 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. Warm roof built up roof a warm flat roof or a built up roof bur is one where all the insulation is above the joists deck making them part of the warm fabric of the building.

A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less. Warm roof build ups can be installed on most modern construction material types such as concrete timber and timber based sheets.