How To Size Roof Ridge Beam

Ridge beam sizing is based on the span of the beam between supports and the amount of roof load supported by the beam.

How to size roof ridge beam.

Because a ridge beam often carries a significant area of roof load they can exhibit structural distress due to a defect in wood impact on the roof or use of an undersize beam. The ridge beam shown below at the living room of a 1950s modern style ranch house in gainesville has cracked at mid span and is slowly heading towards failure after. Ridge beams and boards modern raising ceiling joists jlc technical steico construction roof rafter collar tie calculations structural ridge beamtimber steel framing manual single span ridge beamglulam ridge beam span table elcho. I always always build trusses.

You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. A ridge board is a non structural member that serves as a prop for opposing rafters to rest against and connect to. Framing in a ridge beam in shed roof construction is not hard. Ridge beams are required by code if the roof slope is less than 3 in 12 irc section r802 3.

This tells you the size of the beam needed to support the porch s roof. Determining the ridge beam height. If there is are any questions about anything else then you should contact your supplier or an engineer. The finished ridge beam height z above the top of the wall will be m plus the y height.

It has been my experience to never use a beam smaller than a two ply 2 x 8. This means the example porch would need a 6 inch by 8 inch beam. Here s a picture of a gable style shed using a ridge beam. If you know the slope x in 12 you want to use for your roof framing design you can use it along with the run r to determine the height of the ridge beam for example if the slope is 4 in 12 and the run is 12 feet the ridge beam height m will be 4 feet.

Calculate the initial value for d then round it up to the nearest inch. Its the way i was trained to build sheds. Most interior beams need to include the roof load. In the example d calculates to 7 75.