This roofing material is an evolution of BUR and comes in sheets or rolls. It’s made from asphalt and reinforced with modifiers such as rubber or plastic, giving it added flexibility and strength. Modified bitumen roofs are easier to install than BUR and offer good waterproofing properties. A single-ply rolled roof similar to ice-and-water shield, but impregnated with a mineral-based wear surface. Torch-down systems involve heating the adhesive as the material is unrolled. Newer peel-and-stick systems are safer and easier.

Pros

• Peel-and-stick material can be installed by homeowners.
• Its light-colored mineral surface reflects heat and cuts energy bills.
• Its price is in the middle of the pack.

Cons

• Torch-down application is a fire hazard, and not recommended for occupied buildings.
• It’s not as scuff- or tear-resistant as rubber-membrane roofs (see the next item).

Modified bitumen roofing systems have a lifespan of about 20 years. It’s important to note that these roofing systems require very little maintenance, and with proper cleaning and attention to any necessary repairs, modified bitumen roofs can actually last for much longer.