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RE: Freezer Slab[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Freezer Slab
- From: "Tim Spengler" <timothyps(--nospam--at)cleanpak.com>
- Date: Tue, 29 Jul 2003 14:42:04 -0700
From my experience the trick is to remove all of the frozen soil and then install the slab with the thermal break (which your clearly doing). If you don’t get all the frozen matter out it’s going to turn to soup. Not to great for the new slab or adjacent footings if that happens. Did your boring indicate the depth of the ice lense? They can get fairly deep.
The project I was involved with was too large for soil removal (Food warehouse: 25,000 sq. ft). Instead we proposed removal of the slab during the spring, thawing, drying and monitoring during the summer, and slab installation in the fall. Client never went through on it however. Too bad, would have been interesting to monitor it’s performance.
All of the test pits had very fine sandy silt to about 6 to 8 feet deep. The building is a supermarket and the freezer is only about 12' x 20'. I guess what bothers me most is that this is such a usual configuration but such an unusual occurrence.
I had planned on putting 24" of granular fill below the new slab consisting of 2" of sand over a 10 mil vapor barrier over 4" of crushed gravel over 18" of non frost susceptible gravel. Maybe the vapor barrier should go below the non frost susceptible gravel? The slab will be the normal 4" concrete, 4" insulation and a 4" concrete "rat" slab for a total of 12".
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