Flat Roof Framing Details

Although flat roofs are cheaper to build than pitched roofs they have a shorter life span.

Flat roof framing details.

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. Flat roofs are always built at a slight incline at least 1 8 inch per foot. 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. The rise or height of the roof at its peak is the altitude of the triangle.

The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle. 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. Think of a flattened hip roof.

If you build a flat roof try to have it slope in multiple directions to drains or gutters. This ethylene propylene diene monomer rubber covering is very versatile long lasting and very strong. Some roofs actually slope in several directions ensuring optimal water runoff. The flat roof covering can also be epdm.

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. 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. And the line length measurement from the roof peak to the building wall is the hypotenuse. You can do this with a foam layer that exactly fits your roof.

A roof is considered to be flat when it is of a slope of 1 5 o to the horizontal. Waterproof membrane to prevent water penetrating the structure and interior of the building. 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. When framing a flat roof you will need to create a slight incline.

This will help you create a flat roof framing plan. From there the flat roof system you choose will determine the materials you apply.