How To Frame Flat Roof

Flat roofs are always built at a slight incline at least 1 8 inch per foot.

How to frame flat roof.

Notch a birdsmouth where it sits on the low wall and extend it past the wall for the eaves. The lower end is done the same way a skillion or shed roof is. To frame a roof start by choosing a roof style like a frame or gabled. A lean to roof just means it s attached to an existing structure.

A far more common method is to use firring strips which are battens cut at an angle and placed on top of the roof joists. The reason we included this section is to give you a good idea of how to build a sloped roof over a flat roof. To keep the vertical sections from peeling off the walls tom screws on metal brackets called termination stops then cuts off the excess above the brackets. You can do this with a foam layer that exactly fits your roof.

The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle. And the line length measurement from the roof peak to the building wall is the hypotenuse. Lean to shed roof framing. The flat roof covering can also be epdm.

The rise or height of the roof at its peak is the altitude of the triangle. When framing a flat roof you will need to create a slight incline. Cut a piece of two by eight framing lumber to length as a fascia board. Position the fascia board flat against the ends of the beams with the upper edge even with the upper edges of the beams.

Some roofs actually slope in several directions ensuring optimal water runoff. This ethylene propylene diene monomer rubber covering is very versatile long lasting and very strong. That way you know the process. The high end of the rafter sits on or attaches to a ledger plate attached to the existing wall.

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. You can also use the knowledge you gain to evaluate prospective roofing contractors. This will help you create a flat roof framing plan. Then gather your measurements by calculating the run rise and length of each rafter segment in feet and the pitch of your roof in inches.

The run or half the building span is the base of the triangle. How to make a flat roof have a pitch general steps obviously you shouldn t do the work all by yourself.