deck footing size chart 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.
depth: footings should extend to a minimum depth of 12 inches below previously undisturbed soil. footings also must extend at least 12 inches below the frost line the depth to which the ground freezes in winter or must be frost-protected. width: footings should have a minimum width of 12 inches.
deck piers and footings. in your case, the soil under each deck post may be called upon to support 3,000 or more pounds without flinching. the diameter of the hole will probably be no larger than 24 inches in diameter and may be as small as 12 inches. larger diameter holes spread the weight out over more soil area.
concrete footings need to be set at particular depths to ensure that the structures they're supporting don't sag. this article will give you some insight into how deep to dig your footings, and where to turn to for specific regional information about your local structural code standards.
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regardless of reaching solid ground before a minimum depth of 600mm, the deck footing should be at 600mm deep always dig bigger, never smaller . if your engineer has specified a minimum depth, you need to dig to that depth.
deck footings should be set up on grades or slopes only if the area is hot, and there is rare possibility of snow. however, in areas prone to snow and low temperatures, a deep foundation is a must, and the footings need to be placed at depths more than 45 inches at least, and it is not advised that you set up a deck on grades in a snowy area.
codes dont, however, tell how to dig a proper footing hole. a good hole is smooth, strht, and flat-bottomed; includes a footing form; and avoids the pitfalls below. concrete thats mixed correctly. finish with good concrete: the minimum compressive strength of concrete used for footings should be 2500 psi. air pockets and other defects can reduce compressive strength, so the importance of properly mixing and placing concrete cant be overlooked.
freestanding decks should be set away from the house 1 inch or less. step 6 hold a floor joist along the 16-inch on-center line on the rim joist, flush at the top, and drive in a screw through the top of the floor joist and into the rim joist.
shallow footings for deck. i'm building a deck for a client that is in two parts. i've tied the main deck to the house and poured 6 footings for it, then tied the second lower deck to the first in an 'l' shape. the second deck has 9 footings. most of the footings are between 3 and 4 feet deep.