Patio Roof Structural Beam Spacing

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. Beams can be solid lumber or be built from lengths of 2 by lumber nailed together with 1 2 inch pressure treated plywood spacers in between this forms a 3 1 2 inch thick beam that is equal to the width of a 4 by post. 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.

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If there is also a beam in the middle of the roof divide the total load by three.

Patio roof structural beam spacing.

Strength given in the nds and wood structural panel design properties given in the apa pds. Pergola s are thicker mounted on the shorter width and do not move. Louvered patio roof ideas. Then there are wooden beams that are evenly spaced over the frame to create the roof.

Divide the total load according to how many supporting beams the roof will have. Both have posts or columns that support a frame. The smallest beams for patio covers are typically 4 by 6. Since i was planning to attach my patio cover to the existing roof overhang of my home i ensured that it was capable of carrying half of the weight of the new patio cover roof.

A 4 by 10 can usually span up to 12 feet between posts. If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts. In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.

You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Timber beam design seismic forces wind forces floor shearwall diagram lateral loads. Roof cover 1 2 plywood shuttering 1 5 psf roof framing 3 5 psf. The difference comes in with the type and installation of the beams.

If one side of the roof is supported by the house and the other side is supported by the beam divide the total load by two as the beam is only supporting half of the roof. Before i began designing the structure of my new patio cover i expanded the existing 10 x 10 patio slab by pouring another 10 x 10 slab next to it making it roughly 10 x 20. A louvered patio roof is similar to a pergola.

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