Residential Flat Roof Framing

Flat roofs are an often lower cost and easier to install alternative to traditional pitched roofs.

Residential flat roof framing.

As opposed to old built up felt roofing with joins new single ply waterproof membranes are now most commonly used. 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. From there the flat roof system you choose will determine the materials you apply. Roofs are basically five types.

This will help you create a flat roof framing plan. Pvc is 1 90 per sq foot. Epdm is 1 50 per sq foot making it the cheapest single ply membrane. When framing a flat roof you will need to create a slight incline.

It can be framed like a floor system with horizontal framing members at 16 19 or 24 o c. They are common on extensions garages and commercial buildings. 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. 2x framing wood joists timber framing laminated beams steel concrete or sips.

Another common design in the northeast is the saltbox which is a gable roof with one longer side. You can do this with a foam layer that exactly fits your roof. Systemic load path with respect to roof framing connections particularly in the context of conventional wood framed homes. Shed gable hip gambrel and mansard.

Some roofs actually slope in several directions ensuring optimal water runoff. The engineering knowledge needed to cost effectively design homes or evaluate residential construction guidelines are lacking in this area. Tpo is 1 70 per sq foot. 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. Depending on the span many different materials can frame a flat roof. Roof framing is one of those carpenter skills that appears quite complicated and indeed some roof designs are difficult.