Flat Roof Framing Details

Flat roofs are hard to replace.

Flat roof framing details.

Sizes of joists needed for flat roof construction. The rise or height of the roof at its peak is the altitude of the triangle. And the line length measurement from the roof peak to the building wall is the hypotenuse. A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less.

Think of a flattened hip roof. See more ideas about flat roof roof roof construction. 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. Of course you don t need to live in a modern house to deal with a flat roof.

Flat roofs are always built at a slight incline at least 1 8 inch per foot. So any timber joists that are used need to be strong enough to support this weight. 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. Although flat roofs are cheaper to build than pitched roofs they have a shorter life span.

This could mean flat roofs may not raise the same red flags they used to. It must provide adequate protection against the elements keeping the buildings structure and interior dry. A flat roof has a slope of 1 8 per foot to 2 12. Some roofs actually slope in several directions ensuring optimal water runoff.

But now flat roofs often are constructed with fewer layers because of improved waterproofing technology. As you may imagine there is a fair amount of weight involved here in terms of boards felt etc. When framing a flat roof you will need to create a slight incline. If you build a flat roof try to have it slope in multiple directions to drains or gutters.

This will help you create a flat roof framing plan. Flat roofs aren t architecturally logical as rain and snow will shed much more quickly off a sloped roof. The run or half the building span is the base of the triangle. A flat roof must be strong durable and stable throughout its lifetime.

The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle. You can do this with a foam layer that exactly fits your roof. Old asbestos roofs are often replaced with flat roofs. Flat roof types.

May 9 2017 explore bernice ohene s board flat roof construction on pinterest.