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Porch roof needs support columns.
Minimum sizes of posts and beams are set by engineering requirements and are strictly governed by local building codes.
The determining factor of post spacing is the allowable span of your beams.
For example a 6 inch fiberglass diameter column can support 8 000 pounds whereas a 12 inch diameter column can support up to 18 000 pounds.
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These materials may perform an important decorative function in many landscaping designs.
Determine how much support is needed.
Your porch roof will need to have a lot of support in order for it to stay up through the seasons.
You can repeat the same process using a different breadth if you want a beam that is wider or thinner than 6 inches.
For example thick columns in a masonry base are often used on a craftsman porch while a victorian porch may include tightly spaced thin and embellished posts.
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The columns support not only the roof but if you live in cold climates it also has to support loads of snow.
For larger porches such as wrap around porches you will want to make sure that the support is more than you need.
When selecting a porch column ensure that it can carry the weight of your roof.
The beams support the roof rafters or joists which in turn hold the roofing material.
Screw the brace into the beam with 3 inch screws driving them into the side of the board at an angle.
Repeat for each brace until they re all in place.
This means the example porch would need a 6 inch by 8 inch beam.
The larger the roof is the more support that you are going to need.
The size and shaping of your posts and columns should complement the architectural style of your house.
In other words the maximum distance it can cover without support from posts.
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Different column materials have different load bearing capacities.
However if the spacing is too wide the patio cover s beams will bow under the weight of the joists and roof covering materials.
In the example d calculates to 7 75.
It s a good bet that if you are using the identical columns to those already on your porch your replacement column should be satisfactory.
Porch columns are rated to support specific weights i e your roof.
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Substantial posts are generally considered more pleasing to the eye than spindly ones.
The main structural members of patio and deck overheads are posts or columns and beams which run from post to post or from post to ledger.