At one time built up roofs burs.
Nodified bitimin roof.
Modified bitumen was developed in europe during the 1960s and it is a rendition of the old built up roofing bur system.
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But flat roof is a convenient term for a class of multimembrane systems with very shallow pitches.
The 2 part system consists of a base layer and a cap layer.
Developed in europe in the mid 1960s modified bitumen roofing has been used in canada and the united states since about 1975.
No roof should be completely flat or it won t shed water.
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.
Modified bitumen roofs have a lot of advantages over other types of membrane roofing and are often seen as the modern alternative to the built up roof.
It is made up of a bitumen covered membrane which is composed of either.
Modified bitumen is a type of asphalt product that can be applied in a number of ways to the roof in both hot and cold temperatures.
Modified bitumen is a 2 part low slope roof system that is made when polymers are added to asphalt to change its properties.