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iam5050 · Jun 21, 2009, 02:14 AM

I have a thin slab that is really wavy, lots of cracks... Not trying to tie up thousands into it, but would like to have a nice clean area for kids, wife and me to haves areas where we can do things...

Very difficult with wavy floors and in the mid west - the rain hits hard several times per year VERY HARD!

area is 19' x 32'

What would you all do? To right the ship??

ballengerb1 · Jun 21, 2009, 09:34 AM

Are you talking about a slab foundation under your home or an outside patio slab?

iam5050 · Jun 22, 2009, 03:50 PM

Slab foundation in the basement of my home

ballengerb1 · Jun 22, 2009, 03:59 PM

Hard to tell what's under this slab since its very poorly constructed. There may be too little gravel and vapor barrier. I would recommend total tear out and a new gravel, barrier and 3" pour. Patching with 2" may get you sometime but the uncertainty of the old floor indicates it may just continue to crack further and take the patch with it.

iam5050 · Jun 22, 2009, 04:15 PM

Thanks - that was my thought and what I was afraid of the answer being.

Is this what you do for a living? Do you know what avg. rates are per sq ft?

21boat · Jun 22, 2009, 06:14 PM

Average rate is between 5 to 7 dollar a square foot for a tear out and replace. I recommend a 3 1/2" plus Crete floor at min 3500 Psi...

Bal gave good advice here re do it.....

When we lay out a job like this we add a sump pump pit or and out of basement drain tile around the basement inside walls and punch through foundation wall and out to a sloped yard if grades permits. Might as well do it 100% right the second time.

Min would be 3" crushed stone 6" crushed stone one the inside perimeters, then a vapor barrier over that with 3.5 inches of Crete over barrier. Also a Crete sealer after it dries out...