Modified Bitumen Roof Vs Built Up Roof

I need some advice and or opinions about these types of roofs.

Modified bitumen roof vs built up roof.

November 19 2014 9 48pm 1. Built up roof bur vs modified bitumen roof torch down roofing construction questions. If needed a base sheet can be fastened to the roof to create a flat and safe work space. Pros of the modified bitumen.

In the 1970s modified bitumen roofing was introduced to the us roofing market and it quickly caught on. However these have now been replaced by modified bitumen. Built up roofing systems were once a popular solution for commercial and other flat or low sloped roofs. The tar and gravel roof is built up of typically three to five layers of roofing felt.

I had this roof completely torn off and redone bur approx 11 years ago. Modified bitumen what are bur and mod bit. Atactic polypropylene app and styrene butadiene styrene sbs. A built up roofing system is installed by alternating layers of bitumen and reinforced fabric.

Built up roofing the first layer can be adhered directly to the roof substrate. Benefits of bur and mod bit time tested defense. You will never see actual gravel chunks of rock say 3 16 to 1 4 in size on a modified bitumen roof. Second although the gravel spread over a modified bitumen roof is intended to offer uv and hazard.

Strengthened by a polymer reinforced roof wear layer they boast excellent elasticity and flexibility to resist damage. This type of a roof could be installed with the cold adhesives the asphalts or the common torch method. They mix a modifier with high quality asphalt in lieu of a heavy gravel cover to weather well. A plain tar and gravel roof also referred to as a built up roof or bur is quite different from modified bitumen.

Modified bitumen displays the built in redundancy of asphalt built up as well as the uv resistance and flexibility of a modified membrane. This caused the roof to underperform. The main benefit of this kind of a roof is that the peel and stick material is conducive for diy. Modified bitumen mb roofing is an asphalt based close cousin of the built up roof bur designed for buildings with low slope or flat roof structures.

This roof system has two types. Built up roof membranes bur and modified bitumen mod bit are generally composed of alternating layers of bitumen and reinforcing fabrics that create a finished membrane. Bur roof systems have been utilized for over 100. Incredible durability modified bitumen systems share the proven performance of classic built up roofs burs.

Engineered modified bitumen roofing membranes originated in europe in the mid 1960 s and have been used successfully in the united states and canada since approximately 1975.