Roof Ridge Beam Size

Structural ridge beam span calculator posted on april 7 2020 by sandra rafter to ridge beam connection framing roof ceiling construction structural ridge beam absolute deflection in a ridge beam structural ridge beam tricks of the trade.

Roof ridge beam size.

For the initial calculation f can be estimated at 1 000. Also see assumptions for table development. Refer to sfpa s publication southern pine headers beams download in publications that includes all size selection and allowable load tables. The total load is 4 000 pounds.

F stands for the beam s fiber strength in bending which depends on the species of wood. It has been my experience to never use a beam smaller than a two ply 2 x 8. No matter what the specs say. Loading conditions are detailed below.

Ridge beam sizing is based on the span of the beam between supports and the amount of roof load supported by the 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. In the example the beam spans the 10 foot width of the roof.

Ridge boards can only be used in roofs with slopes from 3 in 12 up to 12 in 12.