The beams support the roof rafters or joists which in turn hold the roofing material.
Post and beam patio roof.
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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.
In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts.
Make a cutting on one of the sides of the horizontal roof beam on an angle.
After that to make it flush with the roof of the existing house cut the two outer rafters.
A 4 by 10 can usually span up to 12 feet between posts.
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The smallest beams for patio covers are typically 4 by 6.
If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts.
An essential part of planning a patio roof or gazebo project is determining the number size and spacing of rafters beams and posts according to the loads they will carry.
When the 4x6 beam is in place and supported by the 4x6 posts the existing roof does not carry any of the weight of the new patio cover roof.
Step 1 determine the load per square foot that the roof must support.
This new patio cover roof plan replaces the ledger board that you might attach to existing fascia with a 4x6 beam supported by 4x6 posts.
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You have to do it thoroughly so that the rafters sit flush on it.
Attach the horizontal beam by using a nail gun.
The main structural members of patio and deck overheads are posts or columns and beams which run from post to post or from post to ledger.