Header Spans For Covered Porch Roof

Window door garage door headers supporting roof wall floor loads.

Header spans for covered porch roof.

Jan 15 2017 a simple buying guide for beams and rafters that support patio roofs. In the example the beam spans the 10 foot width of the roof. Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts.

Girder spans and header spans for exterior bearing walls maximum spans for douglas fir larch hem fir southern pine and spruce pine fir and required number of jack studs. A 4 by 10 can usually span up to 12 feet between posts. Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall. For a porch roof the beam needs to be sized according to the maximum snow loads in your area and you must know enough about the porch design to determine how the load will be distributed and over what distance the beam will carry the load.

The tables below give maximum spans for rafters and beams. Build your patio cover or deck designing with roof rafter span tables board can span 16 ft for a wall pergola patio roof maximum beam rafter spanspatio roof beam calculatorpatio coversplease plete. The smallest beams for patio covers are typically 4 by 6. Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.

For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. Includes size and spacing tables for load bearing and links to related articles. Roof ceiling and one clear span floor 4 2x12 9 11 2 8 7 2 7 8 2 fccip 425 main st ste 25 greenfield ma 01301 3393 fccip staff phone. If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts.