Shed Roof Beam Size

This tells you the size of the beam needed to support the porch s roof.

Shed roof beam size.

In the example d calculates to 7 75. 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. Remember that for rafters you ll always use a ridge beam one size larger. Don t forget to cut the ends of each board to the appropriate angle to allow them to fit together at the peak.

Window door garage door headers supporting roof wall floor loads. Calculate the initial value for d then round it up to the nearest inch. Tables providing size selections for various beam spans and loading combinations for southern pine dimension lumber and southern pine glued laminated timber are available for the following applications. If you re planning on building a gable roof with a pitch of 4 12 for a shed that s 200 inches 510 cm wide your rafter boards would need to be 105 3 inches 267 cm long on each side.

So in our case 2 6. We ll be using a ridge beam for this project so each set of rafters will meet a horizontal 2 6 at the apex which will run the length of the shed and connect to all of the rafters. Window door garage door headers supporting roof loads only. This means the example porch would need a 6 inch by 8 inch beam.

Maximum rafter spans for a patio roof.