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Old 09-07-2012, 11:29 AM   #1
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Helping my family build a very large deck, the design is engineered and the footings need to be 24"x24"x 12"deep. In our area the code does not call for frost proof footings on decks so we plan only putting the footings maybe 9 to 10 inches below the grade, so this keeps the post a couple inches off the ground.

My question is when we dig out a 24"x24" hole for the footing, can we just use say a 2x6 for the form and then stake it at the correct elevation? Or will I need to get some plywood or osb and trim it down into 12" boards and use a full height form for the footing?

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Old 09-07-2012, 11:52 AM   #2
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Code or not if that footing is not below the frost level that deck is going to heave.
Footings below grade do not need a form, but they will need rebar inside of them.

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Old 09-07-2012, 12:04 PM   #3
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There are no issues with frost heave in this area, never once seen a case of it with decks, sheds, slabs, ect..
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Old 09-07-2012, 01:45 PM   #4
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myself I'd dig a 24" x 24" hole down to the depth you want and then place 12" of concrete into the hole. no forms required. was there any steel reinforcing bars indicated? if not I'd place (2) 1/2" (#4) rebars and then another (2) bars on top of those turned 90 degrees to the first.
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Old 09-07-2012, 03:15 PM   #5
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My question is when we dig out a 24"x24" hole for the footing, can we just use say a 2x6 for the form and then stake it at the correct elevation? Or will I need to get some plywood or osb and trim it down into 12" boards and use a full height form for the footing?


The answer to your question is yes.
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Old 09-07-2012, 09:30 PM   #6
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No problem at all with what you're proposing. Actually that's the preferred way because the concrete will be against virgin soil instead of having to be back filled and thus will give more support.
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Old 09-07-2012, 10:58 PM   #7
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If building for safety (minimum code); 12" below grade is required; http://www.masonryinstitute.com/webp...TOKEN=72333778

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Old 09-08-2012, 10:24 AM   #8
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Nobody really uses full height forms for footings. You're fine with the 2x6. I'd also play it safe and go down the full 12 inches.

And growing up in western Washington, I'd never even heard of frost heaves until I moved to the Methow Valley. It sure was a surprise seeing the roads buckle everywhere when it got cold.

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