Flat Roof Framing Details

Flat roofs are always built at a slight incline at least 1 8 inch per foot.

Flat roof framing details. When framing a flat roof you will need to create a slight incline. Sizes of joists needed for flat roof construction. Of course you don t need to live in a modern house to deal with a flat roof. Yet for historic modern style buildings like this old house s cambridge tv project flat roofs are at the core of the architecture meant to reflect the broad horizontal lines of the natural landscape.

Some observers suggest it s harder to replace a flat roof than a traditional pitched shingle roof because of the labor required to remove its layers especially on older flat roofs. Some roofs actually slope in several directions ensuring optimal water runoff. A flat roof has a slope of 1 8 per foot to 2 12. This could mean flat roofs may not raise the same red flags they used to.

A flat roof must be strong durable and stable throughout its lifetime. May 9 2017 explore bernice ohene s board flat roof construction on pinterest. It is not ideal for snow or heavy rain but modern materials and proper drainage have helped. Flat roofs aren t architecturally logical as rain and snow will shed much more quickly off a sloped roof.

As you may imagine there is a fair amount of weight involved here in terms of boards felt etc. If you build a flat roof try to have it slope in multiple directions to drains or gutters. The rise or height of the roof at its peak is the altitude of the triangle. You can do this with a foam layer that exactly fits your roof.

Old asbestos roofs are often replaced with flat roofs. But now flat roofs often are constructed with fewer layers because of improved waterproofing technology. Flat roof construction for residential. The run or half the building span is the base of the triangle.

Although flat roofs are cheaper to build than pitched roofs they have a shorter life span. A roof is considered to be flat when it is of a slope of 1 5 o to the horizontal. Flat roof types. This will help you create a flat roof framing plan.

Flat roofs are hard to replace. So any timber joists that are used need to be strong enough to support this weight. A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less. And the line length measurement from the roof peak to the building wall is the hypotenuse.

It must provide adequate protection against the elements keeping the buildings structure and interior dry.