Roofing Q&A

Modified Bitumen: cool roof eligibility?

Modified bitumen roofing is a common choice for flat or low-slope roofs, made by adding rubber or plastic modifiers to asphalt to improve durability. When considering cool roof eligibility, it’s important to understand that not all modified bitumen products automatically qualify as cool roofs. Cool roofs are designed to reflect more sunlight and absorb less heat, contributing to energy savings and lower indoor temperatures. Modified bitumen membranes can be coated with reflective materials to achieve cool roof status, but the base material itself is generally dark and absorbs heat. This means if you have or plan to install modified bitumen roofing and want it to qualify as a cool roof for energy incentives or compliance, you should look for specific reflective coatings or membrane options rated for high solar reflectance and thermal emittance.

To check if your modified bitumen roof could be eligible for cool roof programs or rebates, start with simple visual inspections. Look for a light-colored, reflective top coating, which is often white or light gray. If the roof is dark, it likely does not meet cool roof criteria without additional treatment. Ensure there are no cracks or damages that might compromise the coating’s effectiveness. You can safely inspect the roof from the ground using binoculars or from a ladder if you’re comfortable and have proper safety gear. If in doubt, call a trusted roofing contractor and ask if your modified bitumen roof or a new roof installation can meet local energy codes or rebate requirements by applying a reflective coating. Questions like “Is this modified bitumen membrane rated for cool roof certification?” or “What type of reflective coating can be applied without voiding my roof warranty?” will help ensure you get clear, warranty-conscious advice.