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.
Considerations there are several considerations to be made in determining the proper placement of posts.
2x4 doubled can span 4 etc.
Never place concrete next to wood.
You must have a porch post at each corner of the porch.
How to properly space posts.
In general the maximum span for a 4 by 6 beam is 6 feet between 4 by 4 posts.
Patio roof posts columns posts and columns may be made from several types of materials.
Rule of thumb a beam can span about one foot for every inch of depth.
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.
Solid lumber such as 4 by 4s 6 by 6s and 8 by 8s.
Adding a covered porch adds exterior space to a house and providing a.
Here we look at the most common.
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.
If you move up to 4 by 8 you re usually allowed to span up to 10 feet between posts.
With just rafter load.
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.
A roof protects a house and porch from snow and rain as well as the heat of the sun.
A 4 by 10 can usually span up to 12 feet between posts.
Once you decide the distance measure from the house for the first row of boards.
Post spacing should be even.
Typical post size is a pressure treated 4 4.
An essential part of planning a patio roof or gazebo project is determining the number size and spacing of rafters beams and posts according to the loads they will carry.
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.
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.
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.
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.
