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.
Pictures of bur roofing.
Asphalt coated fiber glass reinforcement mat.
Bur is preferred for low slope or flat roofs because it creates a continuous sealed surface.
As a system built up roofing bur is a type of asphalt roofing that has been around for more than 100 years.
Built up roof systems typically have a layer of insulation under the waterproof bitumen membrane as well as some sort of protective surfacing most commonly gravel.
Built up roofing bur a built up roof bur is a layered roof that is created by alternating layers of roofing felt and waterproof materials such as fiberglass and hot tar bitumen.
This is not a self diagnostic guide but rather an informative list of some of the problems most often battled.
Despite the system s established history bur technology continues to progress especially in the hands of firestone engineers chemists and technicians who.
Meets the requirements of astm d 3909.
It is one of the most common materials used on low slope or flat roofs.
Low moisture excellent dimensional stability and resistance to rot make it an ideal replacement for organic cap sheets.
It was developed as a means to improve roofing membranes when product quality was affected by the use of a lower quality crude oil by product.
Components of a bur system include the roof deck a vapor retarder insulation membrane and surfacing material.
Glaskap is used as a cap sheet in a variety of built up roofing systems.
Modified bitumen built up roofing.
Normally used on roofs that are flat or with a very slight pitch bur roofit is fire resistant and inexpensive but the roofing is messy and smelly to install.
Built up roofing or bur is the most popular choice of roofing used on commercial industrial and institutional buildings.
Provide protection to the underlying bitumen and membrane and have a low maintenance cost.
A built up roof is frequently called a bur in technical literature.
Buildings magazine examined which problems are most common and the conditions that can either cause or be the result of premature failure and reduced service life of low slope roof systems.
Developed in europe in the mid 1960s modified bitumen roofing has been used in canada and the united states since about 1975.
Bur is used on flat or low sloped roofs and consists of multiple layers of bitumen and ply sheets.
Obvious or unforeseen roof problems are always a pain and undoubtedly a significant expense.
