How Many Posts To Support A Roof

Measuring posts for a freestanding roof differs in only one respect from measuring for a house attached roof with the attached roof you ve already defined the roof height at the ledger line.

How many posts to support a roof.

Consult with a structural engineer local building officials and contractors who specialize in this work. The number size spacing of the suports depends entirely on the depth strengh of the header spanning them. How to support a porch roof. For a freestanding overhead you will need to erect a post slightly taller than the desired height mark the height on the post and work from it as.

A 4 by 10 can usually span up to 12 feet between posts. Therefore take the total weight divide it by 2 3960 lbs and then divide it by the number of posts usually 2 1980 lbs or 3 1320 lbs. Keep in mind that these figures depend on the size and spacing of joists and the overall structural loads. 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. If the deck doubles as a porch it needs to be able to support no more than 80 psf. For deck roof posts dig holes for the roof posts and pour cement to keep them secure. A 12 inch diameter footing would suffice for footings in gravelly soil and the depth would depend upon frost levels.

Just as an example have an open porch approx 40 long 8 deep supported. Posts and columns may be made from several types of materials. You will need to plant a minimum of six posts that will support your carport roof. Any post that will touch the ground should be pressure treated for decay resistance.

Knowing which material to use and where to plant your posts are important factors in building a secure carport. Sometimes they e built up from more than one size of lumber. Patio roof posts columns. Posts and footings support the weight of your house so you have to size them right.

Here we look at the most common. Most deck roofs require separate footings from the deck to support the weight of the roof throughout the seasons. In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts. Most metal companies require support for metal roofing or siding at a maximum of 2 therefore wall girts and roof purlins should also be spaced no farther than 2 o c.

Load bearing posts must have a solid footing on undisturbed soil and all parts of the post must be fastened together. Or as required by design. Solid lumber such as 4 by 4s 6 by 6s and 8 by 8s. Cut beams to fit.

Porch decks also require larger footings than deck footings. Continue installing porch. If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts.