Patio Roof Spans

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Patio roof spans.

Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. To determine the design load of your roof consult your local building code. A 4 by 10 can usually span up to 12 feet between posts. That depends on the design load of your roof and the span of your rafters.

L stands for the span of the beam in feet. The total load is 4 000 pounds. You can determine the allowable spans of different rafter sizes and spacing from the span calculator by the american wood council. The tables below give maximum spans for rafters and beams.

The smallest beams for patio covers are typically 4 by 6. Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall. These are specific to the area where you live. In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts.

Also available for the android os. Patio roof beam calculator. Maximum rafter spans for a patio roof. Please plete the items below and read general notes.

Single ply beam solution professional deck builder. Patio roof maximum beam rafter spans home. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. For example in the rafter span table below the highlighted cell in the 40 live load table indicates that 2 x 8 southern yellow pine joists that have a grade of 2 that are spaced 24 apart can have a maximum span of 10 feet 3 inches 10 3 if designing for a live load of 40 lbs ft 2.

If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts. F stands for the beam s fiber strength in bending which depends on the species of wood. Maximum roof slope is 5 for monoslope and 22 5 for pitched roof. Span calculator for wood joists and rafters also available for the android os.

The number of supports beams or purlins affects the allowable span length. Patio height hc must always be less than roof height h. In the example the beam spans the 10 foot width of the roof. Patio cover plans build your or deck.