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Old 08-19-2009, 12:09 PM   #1
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Cracked slab


A few questions. Slab in a garage is cracked down the middle. Sunroom above garage. Only a slab on grade no foundation. Crack is caused by the outer wall sinking about 1 3/4" do to gutters no being cleaned and drain pipes no longer working. Block walls are now rolling out and in (not level). How much of a problem is this? Will a retro-fit work by adding a grade beam? Does all the concrete need to be removed and replaced? And lastly is it best to remove and reset the out of level block wall?
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Old 08-19-2009, 02:15 PM   #2
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Cracked slab


A 2 story needs an 8" thick concrete wall, on a frost depth footing. Which you know.

I'd get it engineered to have a plan of attack. Possibly dig under from either side (easier one) to pin and pour in sections, a real foundation footing and wall to support the slab. Access to the outside, see if your local B.D. will accept this: http://www.oikos.com/esb/43/foundations.html Or start over due to the block wall rebuilding.
Be safe, G
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Old 08-20-2009, 05:31 AM   #3
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Cracked slab


Quote:
Originally Posted by GBAR in WA View Post
A 2 story needs an 8" thick concrete wall, on a frost depth footing. Which you know.

I'd get it engineered to have a plan of attack. Possibly dig under from either side (easier one) to pin and pour in sections, a real foundation footing and wall to support the slab. Access to the outside, see if your local B.D. will accept this: http://www.oikos.com/esb/43/foundations.html Or start over due to the block wall rebuilding.
Be safe, G
My issue is how to support/raise the wall which is block. I plan to use a grade beam so I only have to dig to 42" at both ends and the middle. The beam will be 12 X 12 so it exceeds the 8" requirement.
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Old 08-21-2009, 07:02 AM   #4
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Cracked slab


i'd be rebuilding the wall, bob,,, the grade beam could likely be placed leaving the slab in place.
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