Concrete Foundation Problems

Q: Our house was recently built and it was cold outside when the contractor poured the concrete floor. I think the top layer of the floor is weak because we have had a dusting and sandy grit problem that comes off the top of the floor. The builder put a sealer over the floor, which he says will do the trick. Have you ever heard of a problem like this?

A: Because your floor has a dusty and sandy grit problem that comes off the top of concrete poured when it was cold outside, the concrete may have frozen and the whole thing may need to be replaced.

However, before you bring out the jack hammer, have the floor tested for concrete strength. This test involves drilling a six-inch diameter piece core from the floor (which will then be replaced) and having a concrete laboratory test the strength of the concrete.

Ask the builder to have the floor tested. If he doesn't know who to contact, have him ask a structural engineer for a referral to a concrete lab in your area.

If he refuses, you may have to have the test done yourself, in order to have proof that he needs to replace the floor and reimburse you for the cost of the test.

If the floor turns out to be sound, at least you will have the peace of mind to finish installing the carpet and enjoy your room.