Porch Roof Beams

Large 8 x 8 posts are necessary for the use of supporting a porch roof. Patio roof beams 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. While many like to use the smaller 4 x 4 posts they can tend to warp after they have been standing under the weight for several seasons.

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Porch roof beams.

The tables below give maximum spans for rafters and beams. Sheathing 1 2 inch plywood or osb is nailed to the rafters. These beams are not structural. Maximum rafter spans for a patio roof.

In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts. Cut beams to fit. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. Below you ll see a flat roof which you don t see as often these days.

Once completed roofing paper will be installed. You can see how lovely a flat roof can be. When building a porch roof asphalt shingles or other roofing material are then attached over the roofing paper and drip edge. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.

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 supporting beams are painted white and the tongue and groove boards are whitewashed. If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts. Apr 26 2018 explore christina romero s board porch beams followed by 132 people on pinterest.

There are many choices to consider when selecting your roof style. Porch flat roof patio roof front porch dark ceiling roof ceiling ceiling fan porch ceiling lights ceiling lighting up house porch ceiling styles the porch company beadboard collar ties exposed beams. In the porch below you ll see a beam that goes from the front of the porch back to the house. This provides dimension for the flat roof.

Measure the distance between the bottom of the porch roof and the top of the ledger beams of the porch. We added them strictly for aesthetic. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Step 1 determine the load per square foot that the roof must support.

A 4 by 10 can usually span up to 12 feet between posts. Then attach drip edge over the roofing paper. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. The smallest beams for patio covers are typically 4 by 6.

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