Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
Porch roof beams.
Cut beams to fit.
Large 8 x 8 posts are necessary for the use of supporting a porch roof.
These beams are not structural.
This provides dimension for the flat roof.
Sheathing 1 2 inch plywood or osb is nailed to the rafters.
If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts.
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.
See more ideas about house exterior porch columns house with porch.
Maximum rafter spans for a patio roof.
A 4 by 10 can usually span up to 12 feet between posts.
Measure the distance between the bottom of the porch roof and the top of the ledger beams of the porch.
Once completed roofing paper will be installed.
When building a porch roof asphalt shingles or other roofing material are then attached over the roofing paper and drip edge.
There are many choices to consider when selecting your roof style.
The supporting beams are painted white and the tongue and groove boards are whitewashed.
You can see how lovely a flat roof can be.
Below you ll see a flat roof which you don t see as often these days.
In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.
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.
We added them strictly for aesthetic.
In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts.
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.
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.
For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.
The tables below give maximum spans for rafters and beams.
Apr 26 2018 explore christina romero s board porch beams followed by 132 people on pinterest.
Step 1 determine the load per square foot that the roof must support.
You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
