Thickness Of Roof Rafters

Here the wall thickness is 240 57 inches.

Thickness of roof rafters.

Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run. How thick should a roof be. Rafters are the structural beams that support the weight of the roof sheathing and the shingles. For instance if your roof has a steep pitch you may be able to use 2 inch by 4 inch rafters but if your roof has a low pitch building code may require that you used 2 inch by 6 inch or 2 inch by 8 inch rafters.

Loads will vary with the. It is always better to have a large rafter rather than be concerned with a sagging roof. Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads.

Wall height allow for ridge thickness when determining rafter run to outer wall. The typical thickness range for sheathing is 3 8 to 3 4 inch. As roof pitch is lowered the weight burden on the rafters increases. See rafter run to outer wall calculator below.

Sheathing should be a minimum of 19 32 inch thick. For low pitch roofs building codes may require larger dimension rafters. Once all of these inputs have been entered into the calculator you will see that the appropriate rafter width is 120 33 inches. In addition using the rafters diagram you can see the precise dimensions of the roof rafter including length from every possible angle.

Never attach roof sheathing with staples. Half building width minus 1 2 ridge thickness. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. Includes result for hip valley factor slope factor and the roof slope in degrees.

Structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. Trusses are not as thick as rafters are because they are engineered from multiple wood members with the ability. 8d ring shank nails should be used instead.