Should Deck Posts Sunk In Concrete Or Above Ground?

 
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Old 04-17-2010, 01:24 PM   #1
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Should Deck Posts Sunk In Concrete Or Above Ground?


What is a better way to go. I have to fix a friends 8x8 porch that is about has moved about two inches from the house. The 4"x4" posts supporting it are on a square slab of concrete maybe a foot deep into the ground. I believe the porch moves slightly up when the ground freezes and back down when it is warm. Thus, the cause of the problem. The freeze line where I live is 42". I know I have to dig down that far and fill it with concrete. My question is, is it better to sink the new 4"x4"s into the concrete below the ground or is it better to use a Red Head bolt into the concrete, connecting a galvanized bracket that holds the 4"x4" say 4" above the ground
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Old 04-17-2010, 03:13 PM   #2
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Re: Should Deck Posts Sunk In Concrete Or Above Ground?


Do you live in Yukon, to have 42" frost line?

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Old 04-17-2010, 03:16 PM   #3
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Re: Should Deck Posts Sunk In Concrete Or Above Ground?


Above. Wood in concrete = ROT.
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Old 04-17-2010, 03:40 PM   #4
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Re: Should Deck Posts Sunk In Concrete Or Above Ground?


Quote:
Do you live in Yukon, to have 42" frost line?
Its dang near that here
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Old 04-17-2010, 03:41 PM   #5
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Re: Should Deck Posts Sunk In Concrete Or Above Ground?






Quote:
Originally Posted by rotarex View Post
Do you live in Yukon, to have 42" frost line?
I'm in Connecticut and its 42 inches here
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Old 04-17-2010, 03:44 PM   #6
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Re: Should Deck Posts Sunk In Concrete Or Above Ground?


Yep here in IA it's 42" as well. I would put them on top exactly as JonM's pic.

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Old 04-17-2010, 03:47 PM   #7
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Re: Should Deck Posts Sunk In Concrete Or Above Ground?


Yea 42" here too. Or pinned to rock ledge.
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Old 04-17-2010, 03:47 PM   #8
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Re: Should Deck Posts Sunk In Concrete Or Above Ground?


the connector in JonM's post or dig down, pour concrete pad at bottom of hole, then set post and fill/tamp-works in my area, may not be appropiate for you area.
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Old 04-17-2010, 03:52 PM   #9
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Re: Should Deck Posts Sunk In Concrete Or Above Ground?


Here in Connecticut its 42" as well.
You want to put the posts on top like Johns pic. If you sink them in the concrete eventually water will get down between the post and concrete, the when it freezes and the ice expands it will break apart the concrete. I have seen this failure more than once.
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Old 04-17-2010, 05:21 PM   #10
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Re: Should Deck Posts Sunk In Concrete Or Above Ground?


Ours is 48".

Above ground BTW
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Old 04-17-2010, 05:37 PM   #11
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Re: Should Deck Posts Sunk In Concrete Or Above Ground?


Quote:
Originally Posted by rotarex View Post
Do you live in Yukon, to have 42" frost line?
(http://www.toronto.ca/water/supply/s...watermains.htm)

"Water main pipes are buried in public streets, about 1.5 m deep, just below the area where frost ends or 'the frost line'.
1.5 m is about 5 feet."
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Old 04-17-2010, 06:03 PM   #12
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Re: Should Deck Posts Sunk In Concrete Or Above Ground?


42" in CT also. If you put them in the concrete the inspector will make you do it over. Use the Simpson Hurricane brackets will make things easier.
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Old 04-17-2010, 06:31 PM   #13
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Re: Should Deck Posts Sunk In Concrete Or Above Ground?


Quote:
Originally Posted by rotarex View Post
Do you live in Yukon, to have 42" frost line?
That's what it is here in Toronto.

That's why code for deck footings is 48".

What did you think it was?
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Old 04-17-2010, 06:40 PM   #14
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Re: Should Deck Posts Sunk In Concrete Or Above Ground?


Set on post bases above ground for us.

However, I know several reputable deck builders that do embed the post in the ground--not necessarily in concrete, but on a buried concrete footing and then fill around the post.
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Old 04-17-2010, 07:51 PM   #15
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Re: Should Deck Posts Sunk In Concrete Or Above Ground?


At 48" you might find Perma frost LOL. We did once in PA. It was May and we dug about 48 and i saw ice Of course it was fill dirt.
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Old 04-17-2010, 07:56 PM   #16
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Re: Should Deck Posts Sunk In Concrete Or Above Ground?


Quote:
Originally Posted by DecksEtc View Post
That's what it is here in Toronto.

That's why code for deck footings is 48".

What did you think it was?
I thaught it's 6" above ground, I use spikes for all my decks, and 6" above ground only makes sence, don't you see all the homeless people sleeping around, that's because under 6" it's tropical
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Old 04-17-2010, 07:58 PM   #17
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Re: Should Deck Posts Sunk In Concrete Or Above Ground?


Quote:
Originally Posted by Greg Di View Post

However, I know several reputable deck builders that do embed the post in the ground--not necessarily in concrete, but on a buried concrete footing and then fill around the post.
are you talking about the bigfoots or regular footings?

how long have they been doing it that way. Sounds strong, but around 10 years or so would have problems. Almost sounds like a good fence contractor.
But I'm no deck expert, only built 2 of them.
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Old 04-17-2010, 08:01 PM   #18
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Re: Should Deck Posts Sunk In Concrete Or Above Ground?


Quote:
Originally Posted by Craftsman Jay View Post
are you talking about the bigfoots or regular footings?

how long have they been doing it that way. Sounds strong, but around 10 years or so would have problems. Almost sounds like a good fence contractor.
But I'm no deck expert, only built 2 of them.
Last year I refinished one we did
like that 25 years ago.
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Old 04-17-2010, 08:15 PM   #19
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Re: Should Deck Posts Sunk In Concrete Or Above Ground?


I stand corrected. Just footing on bottom and post set. Back filled with dirt?
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Old 04-17-2010, 09:31 PM   #20
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Re: Should Deck Posts Sunk In Concrete Or Above Ground?


Quote:
Originally Posted by rotarex View Post
I thaught it's 6" above ground, I use spikes for all my decks, and 6" above ground only makes sence, don't you see all the homeless people sleeping around, that's because under 6" it's tropical


That makes absolutely no sense whatsoever.

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