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Old 07-27-2013, 03:42 PM
Red Shed Landscaping Red Shed Landscaping is offline
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Join Date: Mar 2007
Location: North Central IA
Posts: 174
If it were my driveway I wouldn't do less than 6 inches since we live in a frost prone area. Most of the concrete contractors around here will put down 3-4" of 3/4" clean gravel under the slab instead of sand like they used to use.
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