Flat Roof Framing Plan Details

Old asbestos roofs are often replaced with flat roofs.

Flat roof framing plan details.

The rise or height of the roof at its peak is the altitude of the triangle. If you build a flat roof try to have it slope in multiple directions to drains or gutters. The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle. Flat roof construction for residential.

Flat roofs are hard to replace. 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. Think of a flattened hip roof.

You can do this with a foam layer that exactly fits your roof. This could mean flat roofs may not raise the same red flags they used to. Sizes of joists needed for flat roof construction. The plan that is drawn of the roof area may be either a roof plan or a roof framing plan for some types of roofs a roof drainage plan may also be drawn.

Roof framing and drainage plans will be discussed in chapter 30. It is not ideal for snow or heavy rain but modern materials and proper drainage have helped. A flat roof has a slope of 1 8 per foot to 2 12. 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. And the line length measurement from the roof peak to the building wall is the hypotenuse. The run or half the building span is the base of the triangle. Flat roofs are always built at a slight incline at least 1 8 inch per foot.

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. Materials such as the roofing material vents and their location. Some roofs actually slope in several directions ensuring optimal water runoff. This will help you create a flat roof framing plan.