Flat Roof Framing Plan Details

This could mean flat roofs may not raise the same red flags they used to.

Flat roof framing plan details.

A flat roof has a slope of 1 8 per foot to 2 12. Sizes of joists needed for flat roof construction. When framing a flat roof you will need to create a slight incline. Flat roofs are hard to replace.

The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle. 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. Some roofs actually slope in several directions ensuring optimal water runoff. Flat roofs are always built at a slight incline at least 1 8 inch per foot.

Roof plans a roof plan is used to show the shape of the roof. As you may imagine there is a fair amount of weight involved here in terms of boards felt etc. It is not ideal for snow or heavy rain but modern materials and proper drainage have helped. Roof framing and drainage plans will be discussed in chapter 30.

This will help you create a flat roof framing plan. Think of a flattened hip roof. And the line length measurement from the roof peak to the building wall is the hypotenuse. 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.

If you build a flat roof try to have it slope in multiple directions to drains or gutters. Materials such as the roofing material vents and their location. 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.

The run or half the building span is the base of the triangle. A roof is considered to be flat when it is of a slope of 1 5 o to the horizontal. But now flat roofs often are constructed with fewer layers because of improved waterproofing technology. Old asbestos roofs are often replaced with flat roofs.