How To Frame Flat Roof

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

How to frame flat roof.

At inside vertical corners tom cuts and overlaps the epdm then uses rubber adhesive to glue it down tightly. Flat roofs are always built at a slight incline at least 1 8 inch per foot. That way you know the process. How to make a flat roof have a pitch general steps obviously you shouldn t do the work all by yourself.

The flat roof covering can also be epdm. 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. Position the fascia board flat against the ends of the beams with the upper edge even with the upper edges of the beams.

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. He also seals this seam with uncured rubber. 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. 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. The run or half the building span is the base of the triangle. To frame a roof start by choosing a roof style like a frame or gabled. Another possibility is to cut a fall into the roof insulation something several businesses now offer it s often referred to as tapered insulation.

The rise or height of the roof at its peak is the altitude of the triangle. Cut a piece of two by eight framing lumber to length as a fascia board. A lean to roof just means it s attached to an existing structure. You can also use the knowledge you gain to evaluate prospective roofing contractors.

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. This will help you create a flat roof framing plan. The reason we included this section is to give you a good idea of how to build a sloped roof over a flat roof. And the line length measurement from the roof peak to the building wall is the hypotenuse.

Lean to shed roof framing. Some roofs actually slope in several directions ensuring optimal water runoff.