In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts.
Porch roof beams.
Step 1 determine the load per square foot that the roof must support.
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.
Measure the distance between the bottom of the porch roof and the top of the ledger beams of the porch.
You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
Cut beams to fit.
Sheathing 1 2 inch plywood or osb is nailed to the rafters.
We added them strictly for aesthetic.
The tables below give maximum spans for rafters and beams.
The supporting beams are painted white and the tongue and groove boards are whitewashed.
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.
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Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
See more ideas about house exterior porch columns house with porch.
These beams are not structural.
Maximum rafter spans for a patio roof.
The smallest beams for patio covers are typically 4 by 6.
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There are many choices to consider when selecting your roof style.
Once completed roofing paper will be installed.
In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.
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.
Then attach drip edge over the roofing paper.
This provides dimension for the flat roof.
For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.
Below you ll see a flat roof which you don t see as often these days.
If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts.
A 4 by 10 can usually span up to 12 feet between posts.