Beam Span Awning 4x4

Maximum rafter spans for a patio roof.

Beam span awning 4x4.

Obviously the larger the beam the greater the distance it can span between posts. 2 grade there is a method that can be used for estimating beam spans for a. The selection is based primarily on the local load requirements in combination with the span and number of posts. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.

You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. The smallest beams for patio covers are typically 4 by 6. Building codes for residential decks only require 40 psf. In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts.

Beam span maximums are based on a maximum anticipated live load. If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts. 3x3 or 4x4 box beams are the most popular and used where possible. Patio cover kits will include one of 7 different beam types.

For heavy roofs or in. A 4 by 10 can usually span up to 12 feet between posts. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. A redwood 4x6 beam should span no more than 6 between supporting posts.

The longer the joist the more area of deck the joist supports and thus the beam supports.