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yes im in the north, but the concrete is 14 years old, so the freezing puddles dont seem to be an issue
I'm pretty sure he meant freezing under the slab if you don't pipe the drain away.

You have to decide if having a drain grate is suitable or safe for the use the pad get put to.
 

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Usually Confused
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Injection jacking will lift the entire slab, not just the low parts. Twenty bucks for a squeegee or a few grand to try and fix - I know what my decision would be.
 
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