Flat Roof Build Up

Modified bitumen or torch down roofing is a popular alternative to classic tar and gravel built up roofs.

Flat roof build up.

In terms of the thermal design of a flat roof what are the options and the best practices of flat roof build ups. As the roof is installed more and more layers are added to increase durability and longevity hence the name built up. It is most often made from alternating layers of roofing felt with different waterproofing materials including coal tar pitch asphalt cold application adhesive and modified asphalt. Built up roofing also called bur is the most common roofing material used on low slope roofs.

Bur is preferred for low slope or flat roofs because it creates a continuous sealed surface. Tar and gravel 2. Easier and faster to install it consists of a single rubber membrane that is heated with a torch and then bonded to a fiberglass mat that is attached to the roof sheathing. The recognised flat roof build ups for best design practices are.

Yet for historic modern style buildings like this old house s cambridge tv project flat roofs are at the core of the architecture meant to reflect the broad horizontal lines of the natural landscape. Built up roofs are manufactured using built up layers of either tar saturated paper and liquid tar with gravel asphalt rolled asphalt or modified bitumen. It is light easy to lay and because it is almost entirely liquid in it s original form is easy to get into otherwise inaccessible corners to ensure waterproof surfaces this flat roof covering can be roofing felt usually 3 layers with a mineral chipping topping to soak up the heat of. Built up roofing is a generic term for a roof system that is literally built by adding layers.

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.