Flat Roof Build Up

Repairing blisters on a flat roof.

Flat roof build up.

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. As the roof is installed more and more layers are added to increase durability and longevity hence the name built up. 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. Tar and gravel 2.

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. 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. 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. 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.

Bur is preferred for low slope or flat roofs because it creates a continuous sealed surface. In the case of a flat roof insulation is usually either a rigid board above the deck or a mineral glass wool quilt immediately above the underdrawn ceiling depending on the type of roof design and construction. The recognised flat roof build ups for best design practices are. Flat roofs aren t architecturally logical as rain and snow will shed much more quickly off a sloped roof.

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