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RE: Slabs on grade at garage and people doors[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Slabs on grade at garage and people doors
- From: Harold Sprague <spraguehope(--nospam--at)hotmail.com>
- Date: Tue, 15 Jan 2008 15:43:50 +0000
Option 1 with some caveates.|
I would be most concerned about differential vertical movement at the joint either due to settlement or soil heaving. To control this, I would suggest backfilling with 3/8" crushed rock (not gravel). The crushed rock compacts well, the angularity of the crushed rock holds the aggregate in place pretty well while providing a sufficient void to mitigate heave. Compact the crushed rock with a vibrating compactor.
Thicken the slab, tie the interior slab side to the foundation wall with hooked rebar, provide joints to minimize shrinkage cracking, add rebar to control the shrinkage cracking. The outside slab can be tied to the interior slab with square dowels and PNA square dowel clips which will allow for differential in-plane shrinkage.
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