Flat Roof Framing Details

If you build a flat roof try to have it slope in multiple directions to drains or gutters.

Flat roof framing details.

It is not ideal for snow or heavy rain but modern materials and proper drainage have helped. Flat roofs are always built at a slight incline at least 1 8 inch per foot. Frame the roof photo by russell kaye the most important thing to know about a flat roof says tom is that it s not flat to prevent water from pooling and eventually invading the home flat roofs are always built on a slight incline at least 1 8 inch per foot. Waterproof membrane to prevent water penetrating the structure and interior of the building.

From there the flat roof system you choose will determine the materials you apply. You can do this with a foam layer that exactly fits your roof. The flat roof covering can also be epdm. Cad details document name pdf dwg download all cad construction details 37 1 mb 3 4 mb mc01 identification of roof areas 694 kb 167 kb mc01a single layer underlayment 678 kb 302 kb mc01b double layer underlayment 711 kb 322 kb mc02 vent pipe flashing 626 kb 349 kb mc03 valley.

A roof is considered to be flat when it is of a slope of 1 5 o to the horizontal. Details for conventional wood frame construction the first approach to achieving a strong durable struc ture involving economical use of materials is to follow a. This will help you create a flat roof framing plan. A flat roof usually consists of the following.

And the line length measurement from the roof peak to the building wall is the hypotenuse. Flat roof construction for residential. This ethylene propylene diene monomer rubber covering is very versatile long lasting and very strong. This flat roof covering can be roofing felt usually 3 layers with a mineral chipping topping to soak up the heat of the sun which protects the felt from both melting and breakdown under uv rays.

A flat roof has a slope of 1 8 per foot to 2 12. The run or half the building span is the base of the triangle. Although flat roofs are cheaper to build than pitched roofs they have a shorter life span. When framing a flat roof you will need to create a slight incline.

Some roofs actually slope in several directions ensuring optimal water runoff. Underneath the basics flat roofs are usually constructed with a ceiling nailed to joists which support a deck usually wood in residential construction a vapor barrier insulation and a roof board.