Deck Post Footings Size

Depending on how heavy and high your deck is your concrete footing underground may take 1 4 bags of concrete. This is between 3 and 14 in concrete. For aesthetic reasons most deck builders size them all based on the worst case loading.

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The evolution compression post base will make any deck footing look fantastic because the connection mechanism is completely hidden deep.

Deck post footings size.

In order to determine the proper size for your footings you will need to establish how much total weight they are going to have to support and what kind of soil they are covering. There is little material cost to a buried post footing. Post spacing should be even. Typical post size is a pressure treated 4 4.

In this case though i couldn t find a current source with a table that shows allowable tributary areas for various sizes and wood species of posts. The american wood council publishes the prescriptive residential wood deck construction guide which is based on the international residential code irc. A good size for a common backyard deck is a 10 or 12 diameter for the sonotube and a 20 base diameter. Footings typically must extend below the frost line to prevent shifting during freeze thaw cycles.

Step 2 dig footing holes about 6 inches deeper than required. Use added batter boards and string to mark rows of posts. Unless the deck requires engineering i refer to a beam span table as i design the framing. To calculate the load you should use 40lbs per square foot for live loads these are variable loads that are dynamic such as the weight of.

A larger beam can span a greater distance requiring fewer but larger footings. The size and spacing of footings tie directly to the maximum spacing between posts of the beam they support. Step 3 fill the bottom of the hole with 6 inches of gravel and compact the gravel with a 2x4 or wood post. This is a permanent footing and is great for large or high decks that need very strong footings.

Once you decide the distance measure from the house for the first row of boards. Deck footing size chart. A comparison of the footing sizes i calculated for the example deck resting on 1500 psf soil in the sizing deck footings article and dca 6 table b3 shows an almost identical result. The number of footings needed to support a deck beam is dictated by the beam s size.

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. Of course you can get a 24 base size and it will spread weight over an even greater surface area. When the irc leaves us hanging we can often find an alternative rope to climb. Diameter center footing size and table b3 calls for a 16 in.

My calculations came up with 15 3 4 in.

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