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eagle7

08:12AM | 04/07/06
Member Since: 04/06/06
2 lifetime posts
Bvmisc
Hi,

We have a new 1500 sq ft tiled patio with concrete base installed by a contractor.

During a big rainstorm, water pooled all over the patio. It was evident that the concrete base is not sloped properly to drain water away from the house.

At various edges of the patio, the elevation varies from 1/8" to 1 1/2" different from the lowest point of the patio.

The contractor admits to the defects and wants to come in and correct the problem by shaving off the high points.

What are the pros and cons of this approach?

Will this compromise the integrity of the concrete and promote cracking of the concrete and consequently the tiles?

Should we ask for them to rip out the whole porch and start all over again?

I'm not educated enough to agree or disagree with the contractor's suggested fix?

Would appreciate any help.

Thanks,

eagle

Glenn Good

12:34AM | 04/14/06
Member Since: 09/10/03
320 lifetime posts
It would depend on the method he uses to shave down the concrete and overall thickness you are left with. In the area where there is a 1 ½” problem you will want to insure there will be 4” of concrete remaining after the 1 ½” is removed. If the concrete is only 4” thick before he begins you will end up with a thin section that will be weak. Another consideration is the location of reinforcing wire. If it is near the surface and damaged when removing the concrete you could also weaken the slab.

Let him try it but insure the thickness is not reduced too much and any reinforcement wire is not damaged. It can always be removed if problems are encountered.

Moderator: Construction Systems, Foundations, and Masonry & Stone

For more information about me, my qualifications, and/or home inspections please visit my website at:

www.consultationdirect.com
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