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Old 09-14-2010, 11:02 PM   #1
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deck pier questions

1. my legal frost line is 3 ft but i really don't think ground freezes that deep around here (mid-Atlantic). i wanna go with 2 ft pier depth. and if it does have 1/8", i don't really care so much - it's a deck. do you think that is OK and is 12" pier diameter OK if i'm setting 6x6 posts ?

2. should i bother setting some rebar inside my 12" form tube or simply poured concrete will be fine?

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Old 09-14-2010, 11:30 PM   #2
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Why go to all that work and not even build to minimum Code requirements? Probably wish you did when it heaves.......

Minimum footing size: IRC 2006 Deck Code (minimum safety):

Only if required on the re-bar.

Other frost heave preventions:,M1

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Old 09-15-2010, 05:57 AM   #3
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Frost line for us is 30". But if the deck it attached to the house, footers need to be below frost line. Otherwise, the deck could rise/fall with freeze cycle and pull loose from the house, or damage the house at the ledger. Don't skimp.
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Old 09-15-2010, 04:09 PM   #4
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Isn't the inspector requiring a footing inspection? They wanted to check the depth before I poured on mine.

I'm also confused on how you arrived at 2 feet.... why not go 1 more foot and be up to code.
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Old 09-15-2010, 08:47 PM   #5
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I might do a floating deck above the frost line, but not one attached to a structure.
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