#1  
Old 10-13-2011, 11:33 AM
Laborer
 
Join Date: Jul 2011
Location: 12 minutes from Snowbird UT
Posts: 88
Default Gravel Base for Foundation Slab Question

Can you have too much gravel base under the slab? I'm looking at about six inches of gravel to get the level up to where it needs to be. The other option is to bring in a load of sand and build up the hole that way.
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Old 10-13-2011, 12:33 PM
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Join Date: Dec 2009
Location: Milton, Ontario
Posts: 97
Default Re: Gravel Base for Foundation Slab Question

place a layer of geotextile (the woolly kind) and make sure you pack the gravel down well every time you put a couple inches of gravel. I'd want to make sure the gravel will stay put on the sides - so that may mean making the gravel 6" or so wider than the concrete base.
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Old 10-15-2011, 11:13 AM
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Il Pizzaiolo
 
Join Date: Oct 2006
Location: Vancouver Island
Posts: 1,374
Default Re: Gravel Base for Foundation Slab Question

The thickness itself is not a problem as long as you compact it well as you go. As mingy notes, two inch lifts with hand compaction will do.
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Old 10-16-2011, 09:50 AM
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Join Date: Dec 2009
Location: Milton, Ontario
Posts: 97
Default Re: Gravel Base for Foundation Slab Question

I find hand compacting a *lot* of work.

Of course, I have my own compactor so I might be biased ...
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Old 10-17-2011, 03:38 PM
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Join Date: Dec 2010
Location: Melbourne
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Default Re: Gravel Base for Foundation Slab Question

Ha! Mingy you are biased, but it's the good kind of biased, the kind that saves your back!

Would you believe I actually hired a vibrating plate compactor for my tiny 1.5m x 1.8m foundation? Split the cost with the neighbor so he could do his too, $25 for peace of mind knowing I had a well compacted base for the slab to rest on. Worth it.
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