How Many Posts To Support A Roof

We just completed a beer garden addition with a single sloped roof.

How many posts to support a roof.

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. For deck roof posts dig holes for the roof posts and pour cement to keep them secure. Measure the distance between the bottom of the porch roof and the top of the ledger beams of the porch. The length of your posts will help determine the height of your carport roof.

The international residential code requires railings on any deck that is more than 30 inches off the ground. Large 8 x 8 posts are necessary for the use of supporting a porch roof. Sometimes they e built up from more than one size of lumber. In all probability for this size deck you need to be talking 3 rows of support beams with 3 4 posts each one beam near house one near outside edge one down the middle to be able to get to economical and realistic joist spacing 16 or 24 and realistic post size 4x4 or 6x6 and beams 4x12 or smaller.

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. Most deck roofs require separate footings from the deck to support the weight of the roof throughout the seasons. 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 second factor will be the depth these posts are planted in the ground.

Patio roof posts columns. 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 other words the maximum distance it can cover without support from posts. Consult with a structural engineer local building officials and contractors who specialize in this work.

How many deck posts should a 8 x12 deck have. Load bearing posts must have a solid footing on undisturbed soil and all parts of the post must be fastened together. Posts and footings support the weight of your house so you have to size them right. Here we look at the most common.

Step 2 post height. It was 16 wide x 40 long. Solid lumber such as 4 by 4s 6 by 6s and 8 by 8s. Posts and columns may be made from several types of materials.

The span on your porch posts is determined by the weight load of the roof. The determining factor of post spacing is the allowable span of your beams. According to the old af pa table a 4 foot douglas fir 4x4 post can support 256 square feet of deck. Porch decks also require larger footings than deck footings.

If the deck doubles as a porch it needs to be able to support no more than 80 psf.