How Many Posts To Support A Roof

Using the 2005 nds i calculated that the same post can support 231 square feet so it would seem there s no problem using 4x4s to support say an average sized intermediate stair landing.

How many posts to support a roof.

Posts and footings support the weight of your house so you have to size them right. 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. Sometimes they e built up from more than one size of lumber. However if the spacing is too wide the patio cover s beams will bow under the weight of the joists and roof covering materials.

Step 2 post height. In other words the maximum distance it can cover without support from posts. How many deck posts should a 8 x12 deck have. Our main support posts are 8 on center with a 2 x 10 on the inside and outside of the post at the top and a double 2 x6 top plate.

The length of your posts will help determine the height of your carport roof. Here we look at the most common. According to the old af pa table a 4 foot douglas fir 4x4 post can support 256 square feet of deck. We just completed a beer garden addition with a single sloped roof.

Posts and columns may be made from several types of materials. Measure the distance between the bottom of the porch roof and the top of the ledger beams of the porch. Solid lumber such as 4 by 4s 6 by 6s and 8 by 8s. The span on your porch posts is determined by the weight load of the roof.

Porch decks also require larger footings than deck footings. Patio roof posts columns. Most builders use 4 by 4 inch lumber. Most deck roofs require separate footings from the deck to support the weight of the roof throughout the seasons.

It was 16 wide x 40 long. Large 8 x 8 posts are necessary for the use of supporting a porch roof. The determining factor of post spacing is the allowable span of your beams. The international residential code requires railings on any deck that is more than 30 inches off the ground.

The second factor will be the depth these posts are planted in the ground. For deck roof posts dig holes for the roof posts and pour cement to keep them secure. If the deck doubles as a porch it needs to be able to support no more than 80 psf. Any post that will touch the ground should be pressure treated for decay resistance.

Consult with a structural engineer local building officials and contractors who specialize in this work.