Residential Flat Roof Framing

When framing a flat roof you will need to create a slight incline.

Residential flat roof framing.

Underneath the basics flat roofs are usually constructed with a ceiling nailed to joists which support a deck usually wood in residential construction a vapor barrier insulation and a roof board. In general materials used on flat roofs cost less than ones used on sloped ones. Pvc is 1 90 per sq foot. They are common on extensions garages and commercial buildings.

2x framing wood joists timber framing laminated beams steel concrete or sips. Tpo is 1 70 per sq foot. Some roofs actually slope in several directions ensuring optimal water runoff. Flat roofs usually come with a 10 to 20 year warranty but can last 25 years if you build the roofs right and maintain them using commonsense rules.

Depending on the span many different materials can frame a flat roof. From there the flat roof system you choose will determine the materials you apply. This will help you create a flat roof framing plan. Another common design in the northeast is the saltbox which is a gable roof with one longer side.

Flat roofs are an often lower cost and easier to install alternative to traditional pitched roofs. Roofs are basically five types. You can do this with a foam layer that exactly fits your roof. As opposed to old built up felt roofing with joins new single ply waterproof membranes are now most commonly used.

Epdm is 1 50 per sq foot making it the cheapest single ply membrane. It can be framed like a floor system with horizontal framing members at 16 19 or 24 o c. Flat roofs are always built at a slight incline at least 1 8 inch per foot. Modified bitumen and rolled asphalt roofs cost 1 30 2 20 per sq foot depending on the number of plies.

Shed gable hip gambrel and mansard. Pros and cons for flat roof materials all three types of flat roofing cost 250 to 350 per square 100 square feet but prices vary according to region and size of the roof. Frame the roof photo by russell kaye the most important thing to know about a flat roof says tom is that it s not flat to prevent water from pooling and eventually invading the home flat roofs are always built on a slight incline at least 1 8 inch per foot.