this video shows you how to build the base of a deck foundation or concrete deck footing, using quikrete quik-tube building forms. successfully construct a solid concrete footing for your deck
decks and other permanent structures require deck supports and footings made from structural strength concrete mix. note: it is important to check local building codes for construction requirements in your area; these requirements will include minimum diameter and minimum depth of the footings.
the bracing for this deck is 2 x 4 treated lumber. step 6 to cut the beams to the right length, start by setting the end of a straight joist against the house at the edge of the deck layout.
the hole for the footings should be below the frost line, as large as required by code typically 16 inches in diameter and 8 inches deep for 8-inch-wide piers , and flared. shovel or pour concrete into the hole until it reaches the top of the flared section. take care not to disturb dirt on the sides of the hole. 3.
this decks dimensions are about 14 x 25 with a portion of that cut out for concrete steps . along the long side, five support posts will be used, spaced roughly every 7. note: because a pergola is being built above the deck, two of the support posts will be larger beams than these 4×4 posts; a tutorial on installing those posts will be separate.
a straight concrete pier with a wider flat footing. a good size for a common backyard deck is a 10' or 12' diameter for the sonotube and a 20' base diameter. of course, you can get a 24' base size and it will spread weight over an even greater surface area. the one down side to this is the extra digging involved.
when excavating your deck footings, you'll need to dig below the frost line. find out how deep the frost line is in your area with our frost depth map at decks.com.
a typical pad has a 4-inch layer of gravel underneath and about 4 inches of concrete on top. when building a landing for deck stairs, typical codes require the pad to extend beyond the steps about 36 inches, behind the steps about 12 inches and on the sides of the steps about 6 inches.
how to pour a concrete deck footing. mix concrete in a wheelbarrow and then shovel the wet concrete into each hole, stopping about 12 inches from the tops of the fiber-form tubes. into each tube insert four ½-inch-diameter x 48-inch-long metal reinforcing bars. add more concrete to completely fill each fiber-form tube.
immediately after leveling the surface, align and inset any deck hardware and then smooth the surface of the concrete. step 9 allow the concrete to cure for one day before constructing your deck or placing heavy weight on the footing if standard concrete mix was used, wait about 3 days to begin construction .
the depth of the hole will also have to be filled with gravel, a depth of about 4 inches is the industry norm. it is also considered acceptable to have a patio slab consisting of 50 percent concrete, and 50 percent gravel base. the half-and-half ratio makes it considerably easier to work out the correct ratio of your concrete.