Modified Bitumen Roofing

Modified bitumen is a tough, layered asphalt roof made for flat and low-slope sections, and it’s a good fit for porches, additions and roofs that get walked on. We install and repair modified bitumen across Dallas-Fort Worth from our Haslet headquarters and across the Birmingham area from our Irondale office, starting with a free inspection.

Modified Bitumen Roofing

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What Modified Bitumen Is

Modified bitumen is asphalt that’s been blended with polymers, rubber-like or plastic-like materials that keep it flexible in heat and cold. It comes in rolls reinforced with fiberglass or polyester mats and is installed in layers, usually a base sheet with a cap sheet on top. The cap sheet is often covered in granules that protect the asphalt from the sun.

The layers make it tough. It handles foot traffic and punctures better than single-ply membranes, and it works well on roofs with a lot of vents, pipes or odd shapes. Most modified bitumen roofs last about 15 to 25 years, a little less than TPO, and the multi-layer system weighs more than a single sheet.

It can be installed with a torch, with cold adhesive or as self-adhered sheets that stick on their own. The flame-free methods avoid having an open torch on a house.

why this may be the right roofing for your home

Our clients say it best

I cannot say enough good things about our experience with SWAT. Andrew and Michelle were both so helpful and easy to work with. We had a mess with our insurance company and they worked with us to find a solution.

James Byrnes

Happy Client

I enjoy having James as my contractor. He was very concerned with making sure my work schedule was not interrupted. He responded with patience to all my questions ,concerns and going through paper work.

dorthea lawson

Happy Client

How We Install Modified Bitumen

We remove the old roof down to the deck, repair any soft spots and make sure the roof drains toward the gutters or drains. The base sheet goes down first, then the cap sheet is laid over it with its seams offset from the ones below, so a single seam never runs all the way through the roof. At the walls and edges we run the membrane up and seal it under new flashing, because that’s where flat roofs usually leak.

frequently asked questions

TPO is a single white sheet with heat-welded seams that reflects the sun and usually lasts a bit longer. Modified bitumen is two or more layers of reinforced asphalt that hold up better under foot traffic and around lots of roof penetrations. See our flat roofing page for how all the options compare.

Usually about 15 to 25 years. A granule-surfaced cap sheet, good drainage and quick repairs to damaged spots all help it reach the long end of that range.

Torch application is common and done safely by trained crews, but it does mean open flame on the roof. Cold-applied and self-adhered modified bitumen avoid that, and we’ll tell you which method we plan to use on your roof before the work starts.

Small cracks, blisters and torn seams can usually be patched with new material bonded over the damaged spot. If the roof has many failures or water has soaked the layers underneath, replacement is the better choice.

It handles foot traffic better than most flat roof materials, which is one reason it’s used on roofs people access often. For a roof you plan to use as a deck, ask us about walkway pads or a deck system on top.

It’s usually one of the more affordable flat roof systems, similar to TPO in price. The size of the roof, how many layers come off and the condition of the deck change the price, so we price every roof in person and give you a written quote before any work is scheduled.

Stop worrying and reach out today

We’ll explain each step as we go, and you’ll have a written scope and price before any work starts.