Porch Roof Post Spacing

According to the old af pa table a 4 foot douglas fir 4x4 post can support 256 square feet of deck.

Porch roof post spacing.

Doesn t mater what size the posts are the spacing is governed by beam size and roof load roof slope plays a part in the loading of the beam. If your porch will be a wrap around then it is desirable to have the same distance between porch posts on each side of the porch. Considerations there are several considerations to be made in determining the proper placement of posts. Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.

Solid lumber such as 4 by 4s 6 by 6s and 8 by 8s. Patio roof posts columns posts and columns may be made from several types of materials. With just rafter load. 2x4 doubled can span 4 etc.

Post spacing should be even. How to properly space posts. Post spacing is going to depend on your design local building codes the size and length of your beams and the size of your posts. Here we look at the most common.

Adding a covered porch adds exterior space to a house and providing a. You must have a porch post at each corner of the porch. Typical post size is a pressure treated 4 4. In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts.

Rule of thumb a beam can span about one foot for every inch of depth. A 4 by 10 can usually span up to 12 feet between posts. Keep in mind that these figures depend on the size and spacing of joists and the overall structural loads. Minimum roof pitch for a covered porch.

Make sure to check with your local building department which has codes that determine the minimum size and spacing for posts. A roof protects a house and porch from snow and rain as well as the heat of the sun. For typical decks where only a few family members or the occasional extra guest and backyard patio furniture are expected the average 5 foot to 8 foot measurements for post spacing can be used but if you expect heavy loads of any kind you will need to contact an engineer as well as your local building inspector to determine the exact spacing. Once you decide the distance measure from the house for the first row of boards.

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. If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts. Never place concrete next to wood.