Flat Roof Framing Details

Think of a flattened hip roof.

Flat roof framing details.

It must provide adequate protection against the elements keeping the buildings structure and interior dry. The rise or height of the roof at its peak is the altitude of the triangle. Although flat roofs are cheaper to build than pitched roofs they have a shorter life span. Flat roofs are hard to replace.

A roof is considered to be flat when it is of a slope of 1 5 o to the horizontal. This will help you create a flat roof framing plan. A flat roof has a slope of 1 8 per foot to 2 12. See more ideas about flat roof roof roof construction.

If you build a flat roof try to have it slope in multiple directions to drains or gutters. This could mean flat roofs may not raise the same red flags they used to. Of course you don t need to live in a modern house to deal with a flat roof. You can do this with a foam layer that exactly fits your roof.

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. Flat roof types. A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less. Flat roofs are always built at a slight incline at least 1 8 inch per foot.

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. A flat roof must be strong durable and stable throughout its lifetime. The run or half the building span is the base of the triangle. But now flat roofs often are constructed with fewer layers because of improved waterproofing technology.

So any timber joists that are used need to be strong enough to support this weight. Flat roof construction for residential. Sizes of joists needed for flat roof construction. When framing a flat roof you will need to create a slight incline.

The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle. Flat roofs aren t architecturally logical as rain and snow will shed much more quickly off a sloped roof. May 9 2017 explore bernice ohene s board flat roof construction on pinterest. As you may imagine there is a fair amount of weight involved here in terms of boards felt etc.

Some roofs actually slope in several directions ensuring optimal water runoff.