Roof Construction Rafters

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.

Roof construction rafters.

I plan to have 2 10 joists so there will be a second floor. This means that each rafter is built on the job site using dimensional lumber. If your local building authority has a rafter spacing code you may not space rafters wider than required by code. At valleys and hips there shall be a valley or hip rafter not less than 2 inch 51 mm nominal thickness and.

Rafters are the traditional means of framing a roof. As a general rule roofs that have a high human occupancy rate should be framed with rafters every 16 structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes. If you re framing a gable roof on a new house or building a shed or even a doghouse with a gable roof you ll need to cut a number of roof rafters. Every piece is measured cut and fastened together to form the rafter.

Rafters must be strong enough to hold the roof sheathing and the shingles. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. Framing a roof is the last step in framing new construction. Mark and cut the first rafter ends the first step in building the roof rafters is to cut one rafter board to length with the ends angled properly and then to mark and cut the birds mouth and seat on the rafter.

While most home builders will outsource the construction of roofing trusses the rafter supports of the roof itself learning to frame a roof yourself is one of the true arts of carpentry and a basic primer is covered below. The ridge end of the rafter and often the eve end will need to be cut to the angle of the roof slope. Building with them is known as stick framing. Discover the pros and cons to multiple roof designs.

Before you cut your boards you ll need to measure the width of your building and calculate the exact length of each rafter. From the second floor i have added another 2 framing around on which the roof rafters will sit. Typical rafter spacing codes will specify a minimum spacing of 16 inches 19 2 inches or 24 inches. Hi all i am new to this rafter lingo and techniques but am building a shed that is 16 x16.

I plan to support the ridge beam with support beam in the middle and the ends. Rafters shall be framed not more than 1 1 2 inch 38 mm offset from each other to ridge board or directly opposite from each other with a gusset plate as a tie. The roof rafters provide integral structural support to the roof. 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.