Residential Flat Roof Framing

They are common on extensions garages and commercial buildings.

Residential flat roof framing.

Shed gable hip gambrel and mansard. In general materials used on flat roofs cost less than ones used on sloped ones. As opposed to old built up felt roofing with joins new single ply waterproof membranes are now most commonly used. Depending on the span many different materials can frame a flat 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. 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. Tpo is 1 70 per sq foot. Pvc is 1 90 per sq foot.

From there the flat roof system you choose will determine the materials you apply. Flat roofs are an often lower cost and easier to install alternative to traditional pitched roofs. 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. Roofs are basically five types.

The engineering knowledge needed to cost effectively design homes or evaluate residential construction guidelines are lacking in this area. Roof framing is one of those carpenter skills that appears quite complicated and indeed some roof designs are difficult. Some roofs actually slope in several directions ensuring optimal water runoff. Systemic load path with respect to roof framing connections particularly in the context of conventional wood framed homes.

Another common design in the northeast is the saltbox which is a gable roof with one longer side. When framing a flat roof you will need to create a slight incline. 2x framing wood joists timber framing laminated beams steel concrete or sips. This will help you create a flat roof framing plan.

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. 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.