Flat Roof Layers

Bur systems are redundant meaning if one layer breaks down multiple remaining layers provide immediate protection.

Flat roof layers.

But now flat roofs often are constructed with fewer layers because of improved waterproofing technology. However in almost all areas it is not acceptable to install more than two layers of roofing on any commercial building. Of course flat roofs are not flat but have a very slight roof pitch of between 1 4 to 1 2 per foot. Always stand on a firm section of the roof and wear long pants long sleeves and safety glasses.

The number of plies on a roof implies the number of layers i e. Rubber is waterproof and is relatively easy to install. Drawbacks include potential leakage at the seams or from product shrinkage. A bottom layer or two of insulation board multiple intermediate layers of tar or asphalt alternated with layers of roofing felt and a top layer of gravel.

On most flat roofs such as epdm tpo or modified it is perfectly acceptable to two layers of roofing. The slope of a roof is properly known as its pitch and flat roofs have up to approximately 10. It s all about the money. Flat roofs are hard to replace some observers suggest it s harder to replace a flat roof than a traditional pitched shingle roof because of the labor required to remove its layers especially on older flat roofs.

On the plus side. Plies are the layers of felts fabrics and mats that make up roofs. Why would you want to recover vs tear off. As the roof is installed more and more layers are added to increase durability and longevity hence the name built up.

Tar and gravel 2. Modified bitumen an asphalt based multi ply flat roofing system is considered a modern take on its close cousin bur or built up roof. Built up roofing bur was the most common type of flat roof before modified bitumen and membrane roofing were developed. A flat roof is a roof which is almost level in contrast to the many types of sloped roofs.

Four plies denotes a four layer flat roof membrane system. Just enough slope to drain water but also flat enough to be a problem if not constructed properly. Orient the spade at a 30 to 40 degree angle to the roof and start thrusting a spot in the middle of the roof repeatedly. Adhesive metal straps or gravel are used to secure the rubber roof systems.

Flat roofs are an ancient form mostly used in arid climates and allow the roof space to be used as a living space or a living roof. Bur consists of many layers.