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Old 06-06-2010, 01:43 PM   #1
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Floating Deck / Frost Prevention


Hi,
New to the site. Hope to use is a lot going forward.

I found a lot of information about footings and frost heaving prevention but I want to throw something out there for opinions.

I have a large deck (2 levels) that is 20 years old. I built this on deck blocks on patio slabs. Can't recall if I put stone under the patio slabs or not. Over the years it heaved and went back down OK. About 8-9 years ago, one section heaved and stayed there. The lower section never moved.

I am now looking a replacing the deck with composite and plan on using the sub structure (maybe raise it a bit and re-level).

Given the deck has been down for such a long time, I didn't want to pull up all the blocks and install piers. I thought I would leave the deck blocks in place, cut a 4x4 sheet of Styrofoam with a hole in it to fit around the deck block and then cover the entire section with gravel (or sand if recommended).

Question is... will the above help with any future frost heaving or am I just wasting my $$.

Thank
Sam

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Old 06-07-2010, 11:23 AM   #2
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Floating Deck / Frost Prevention


There's only one way to beat frost heave and that's to put a footing below the frost line.
For me thats below 48".

When I did mine I dug down and poured cement into the bottom of the hole. Then I placed an 8" Sono tube in, and back filled around it, to hold it in place. Then filled it with premixed cement mix.
I mixed the premix right in the Sono tube. Poured a bit of dry mix in the tube, poured in some water, tamped it and kept adding more mix and water until it was filled.
If you have many piers to do, rent a gas engine auger, to dig the holes.

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Old 06-07-2010, 11:37 AM   #3
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Floating Deck / Frost Prevention


Quote:
Originally Posted by Wildie View Post
There's only one way to beat frost heave and that's to put a footing below the frost line.
For me thats below 48".

When I did mine I dug down and poured cement into the bottom of the hole. Then I placed an 8" Sono tube in, and back filled around it, to hold it in place. Then filled it with premixed cement mix.
I mixed the premix right in the Sono tube. Poured a bit of dry mix in the tube, poured in some water, tamped it and kept adding more mix and water until it was filled.
If you have many piers to do, rent a gas engine auger, to dig the holes.
Thanks Wildie,
I'm up in N Ontario so my frost line is similar. I guess I wasn't trying to beat the frost... just trying to take the easy way out and minimize it :-).

I must admit I like the idea of mixing the cement in the tube. Sounds like it would save a bit of time.
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