Porch roof ventilation options.
Open beam metal porch roof.
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Of course all of these solutions are a little more expensive than simply nailing 2 x 10s to the sides of your existing posts.
Step 1 determine the load per square foot that the roof must support.
They also can be boxed in with wood after installation.
Proper roof ventilation is an important aspect of home construction.
For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.
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Metal beams could also be used and would eliminate the need for most of the supporting posts across the front of your porch.
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.