Modified Bitumen Roofs

Modified bitumen roofing is widely used and recommended by many roofing contractors for low sloped or flat roofs. It is very close in approach to a built up roof (BUR) and has some good advantages over other roofing materials.

“Roofers roll out the material, which is an asphalt based sheet membrane, using numerous methods, including hot mop, heat weld or torch, cold-process or self-adhesion.”

Basics Of Modified Bitumen Roofing

Modified bitumen roofing uses asphalt-based sheet membranes that are usually rolled and applied to the surface. Roofers can install modified bitumen roofing using numerous methods, including hot mop, heat weld or torch, cold-process or self-adhesion. Perhaps the most popular install method is the heat weld where the roofing is unrolled and the bottom side of the rolls have a rubberized asphalt. The propane torch allows the rolls to adhere to the subsurface. The other popular method is (SBS) styrene-butadiene-styrene which uses rolls that self adhere to the subsurface.


Modified Bitumen Roofing Cost

Entry – Mid Level: $2.75 to $4.25 psf
Homeowners should assume a cost range (installed) of $275 to $425 per square.

Mid Level – High End: $4.25 to $5.75 psf
Homeowners should assume a cost range (installed) of $425 to $575 per square.

Learn more on modified bitumen roofing cost.

Advantages Of Modified Bitumen Roofing

Versatile And Durable
Modified bitumen roofing is less brittle in cold weather, handles the heat better than built up methods and has good elasticity to help with the longevity of the roof material.

Proven Technology
When it comes to flat or low pitched roofs, this method is quite effective. Basically, it is an up grade from a tar and gravel roof and incorporated solid waterproofing characteristics relative to other options. Many roofers consider this to be a cool roof approach due to the material.

Cost Competitive
One of the big selling points is the cost, which is equivalent to a built up or an asphalt shingle roof. The quality of materials and longevity is usually superior to these options.

Disadvantages

Careful With The Heat Weld Installation
Installers have to be very competent when applying the rolls with a propane torch not to cause damage to the subsurface. This is one reason why many homeowners opt for the self adhesion method.