Framing basement walls on slab.. heaving?

Old 09-07-04, 09:13 PM
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Framing basement walls on slab.. heaving?

A buddy of mine and I are framing his basement. We've shot the bottom plate (PT) to the concrete with a ramset and the top plate directly to the silent floor joists above. Each stud at 16" OC is tight between the bottom and top plates.

Now, we're told that heaving is a concern and that perhaps we should consider a gap to allow up to 3/4" of concrete floor movement. We're nearly done framing. Any thoughts?

If your basement were already framed, what would you do? Go back and shorten the studs? Leave it alone? Any ideas?

Old 09-09-04, 06:51 AM
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I would pose the question to your local municipality, in the form of ,"I'm contemplating finishing my basement and is there a history of floor heaving in this area?"
If you happen to talk to an inspector who has been in the area for a long time, you may be asked the age of your building, because the history may well be from a time that pre-existed reinforcement standards and monolithic pours.
Old 09-09-04, 07:24 AM
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Just curious as to how you would accomplish this.. I mean the studs still have to be nailed securely to something, so where would you have this gap? Besides, if the slab is on footers that extend below the frost line and the house has settled already, any movement there should be minimal. I'd leave it alone.

The studs shouldn't be so tight as to actually bow the top plate and move the joists above.

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