Flat Roof Framing Details

When framing a flat roof you will need to create a slight incline.

Flat roof framing details.

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. And the line length measurement from the roof peak to the building wall is the hypotenuse. Some roofs actually slope in several directions ensuring optimal water runoff. The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle.

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. A flat roof usually consists of the following. 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.

This ethylene propylene diene monomer rubber covering is very versatile long lasting and very strong. Although flat roofs are cheaper to build than pitched roofs they have a shorter life span. This will help you create a flat roof framing plan. 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.

Flat roof construction for residential. The rise or height of the roof at its peak is the altitude of the triangle. Think of a flattened hip roof. Waterproof membrane to prevent water penetrating the structure and interior of the building.

The run or half the building span is the base of the triangle. A flat roof has a slope of 1 8 per foot to 2 12. If you build a flat roof try to have it slope in multiple directions to drains or gutters. The flat roof covering can also be epdm.

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