How Many Posts To Support A Roof

Most deck roofs require separate footings from the deck to support the weight of the roof throughout the seasons.

How many posts to support a roof.

If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts. Keep in mind that these figures depend on the size and spacing of joists and the overall structural loads. Sometimes they e built up from more than one size of lumber. Your porch roof will need to have a lot of support in order for it to stay up through the seasons.

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. If the deck doubles as a porch it needs to be able to support no more than 80 psf. In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts. These will include one at each corner and two in the center.

Or as required by design. Posts and columns may be made from several types of materials. Solid lumber such as 4 by 4s 6 by 6s and 8 by 8s. Continue installing porch.

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. Here we look at the most common. A 12 inch diameter footing would suffice for footings in gravelly soil and the depth would depend upon frost levels. A 4 by 10 can usually span up to 12 feet between posts.

Patio roof posts columns. Go to sutherlands post frame building packages. How to support a porch roof. For deck roof posts dig holes for the roof posts and pour cement to keep them secure.

Load bearing posts must have a solid footing on undisturbed soil and all parts of the post must be fastened together. Step 1 post material. Cut beams to fit. 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.

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. The number size spacing of the suports depends entirely on the depth strengh of the header spanning them. Posts and footings support the weight of your house so you have to size them right. Determine how much support is needed.

Just as an example have an open porch approx 40 long 8 deep supported. Porch decks also require larger footings than deck footings. Consult with a structural engineer local building officials and contractors who specialize in this work.