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Air space under slab

Posted by Karen on September 1st, 2000 03:27 PM

1 of 1 people found this post helpful

While doing some remodeling we pulled the wall off of the stud framing that backs a one
piece tub/shower unit. Noticed that the hole cut into the slab for the plumbing was
never closed up. Other than explaining our bad moisture and mildew problems we have
noticed that the rock bed and the slab are separated by at least 6-8 inches of air.
Obviously the slab couldn't have been poured this way. (over 20 yrs ago) My questions are
Is this settling typical? Do we need to see how far the settling has gone under the
house? Does this need to be refilled? Could the slab break apart without the rock
supporting it? Lots of questions! Thanks for any advice.

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