Flat Roof Framing Details

Flat roofs are hard to replace.

Flat roof framing details.

Old asbestos roofs are often replaced with flat roofs. Flat roofs aren t architecturally logical as rain and snow will shed much more quickly off a sloped 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. And the line length measurement from the roof peak to the building wall is the hypotenuse.

As you may imagine there is a fair amount of weight involved here in terms of boards felt etc. This could mean flat roofs may not raise the same red flags they used to. You can do this with a foam layer that exactly fits your roof. So any timber joists that are used need to be strong enough to support this weight.

May 9 2017 explore bernice ohene s board flat roof construction on pinterest. This will help you create a flat roof framing plan. Flat roof types. Think of a flattened hip roof.

The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle. A roof is considered to be flat when it is of a slope of 1 5 o to the horizontal. The rise or height of the roof at its peak is the altitude of the triangle. 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. A flat roof has a slope of 1 8 per foot to 2 12. See more ideas about flat roof roof roof construction. The run or half the building span is the base of the triangle.

It must provide adequate protection against the elements keeping the buildings structure and interior dry. A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less. When framing a flat roof you will need to create a slight incline. Flat roof construction for residential.

Sizes of joists needed for flat roof construction. A flat roof must be strong durable and stable throughout its lifetime. Flat roofs are always built at a slight incline at least 1 8 inch per foot. Although flat roofs are cheaper to build than pitched roofs they have a shorter life span.

It is not ideal for snow or heavy rain but modern materials and proper drainage have helped.