Ridge Beam Size Roof Framing

This calculator matches up with 90 of the applications in the 2012 international residential code book.

Ridge beam size roof framing. Weather you re building a shed roof or adding a dormer to your second story it is important to choose the proper size rafter. A ridge board is a non structural member that serves as a prop for opposing rafters to rest against and connect to. 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. Most interior beams need to include the roof load.

You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Ridge beams are required by code if the roof slope is less than 3 in 12 irc section r802 3. 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. Its the way i was trained to build sheds.

Collar ties rafter ties tension beams structural ridge beams. It has been my experience to never use a beam smaller than a two ply 2 x 8. Now if you have done any looking around this site you ll quickly see that i am not a fan of using a ridge beam in shed construction. Framing in a ridge beam in shed roof construction is not hard.

Some of these can support the roof and prevent ridge sagging and wall spreading. The finished ridge beam height z above the top of the wall will be m plus the y height. This article describes and illustrates the different types of support that prevents roof sagging and wall bulging at buildings including definitions of collar ties rafter ties and structural ridge beams. I always always build trusses.

If there is are any questions about anything else then you should contact your supplier or an engineer. This sizing guide for roof rafters will help determine what you need for your small project. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. 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.

Here s a picture of a gable style shed using a ridge 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.