As a system built up roofing bur is a type of asphalt roofing that has been around for more than 100 years.
Pictures of bur roofing.
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.
Bur is preferred for low slope or flat roofs because it creates a continuous sealed surface.
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.
Obvious or unforeseen roof problems are always a pain and undoubtedly a significant expense.
There are two main types of burs or tar and gravel roofing systems modified bitumen roofs which are a mix of asphalt and rubber with a layer of gravel on top and ballast roofing which is a different style of larger gravel applied on top of a single ply roofing system.
Despite the system s established history bur technology continues to progress especially in the hands of firestone engineers chemists and technicians who.
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.
Asphalt coated fiber glass reinforcement mat.
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.
Glaskap is used as a cap sheet in a variety of built up roofing systems.
Built up roofing or bur is the most popular choice of roofing used on commercial industrial and institutional buildings.
Bur is used on flat or low sloped roofs and consists of multiple layers of bitumen and ply sheets.
Modified bitumen built up roofing.
Low moisture excellent dimensional stability and resistance to rot make it an ideal replacement for organic cap sheets.
The colloquial term tar and gravel refers to built up roofs.
It is one of the most common materials used on low slope or flat roofs.
Meets the requirements of astm d 3909.
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.
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.
Components of a bur system include the roof deck a vapor retarder insulation membrane and surfacing material.
A built up roof is frequently called a bur in technical literature.
Built up roofing also called bur is the most common roofing material used on low slope roofs.
