Flat Roof

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While they look flat from the outside, flat roofs are not exactly flat—they have a slight incline to prevent water from collecting on the top. The National Roofing Contractors Association considers a roof with a slope of 3-in-12 or less a flat roof.

Flat roofs are mainly used on commercial buildings due to their simplicity and practicality, although many contemporary homes now use flat roof styles. Depending on how the roof will be used, some materials commonly used for flat roofing systems are modified bitumen, TPO, EPDM rubber, and spray polyurethane foam. For example, commercial establishments that use their roofs for restaurants or additional tenant space may use materials more suited for foot traffic, such as EPDM.

However, flat roofs can experience significant heat loss, especially if not properly insulated. In uninsulated homes, up to 25% of thermal transmission can occur through the roof, making insulation crucial for maintaining energy efficiency and comfort. Adding roof insulation is therefore a smart upgrade for flat roofs, like we've written about in our 10 Energy-Efficient Remodeling Ideas guide.