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Old 10-02-2008, 05:44 AM   #1
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Backfill for garage


Hello all. I am building a new house and looking for advise. My land is sloped toward the back of the house allowing me to have a walkout basement. To make my yard level in the front I had to come out of the ground with the foundation block about 5' so I can backfill level with the road. My upper garage also has to be backfilled about 5' to make the slab about 2 steps into the house. OK that being said, I have found different opinions on what should be used for backfill for the garage slab. I was thinking gravel backfill the whole thing, but that could get expensive. What do you guys think? I want to minimize the slab cracking in the future due to settlement.

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Old 10-02-2008, 10:11 AM   #2
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Backfill for garage


I cant visulize real well for this,,,BUT if your thinking a gravel pocket next to your basement walls,,,you just created a collection pool for continual seepage into basement.

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Old 10-02-2008, 01:29 PM   #3
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Backfill for garage


Your excavated soil is likely suitable. Ask local builders/inspectors if they need to get special fill in your area or if the soil is ok. Just be sure to put it down in 6 to 12" layers and compact each layer as you go. It helps if the soil is not too dry and not too wet. About 4" of crushed rock on top is often used around here.
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Old 10-02-2008, 07:36 PM   #4
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Backfill for garage


Tough to see what is going on there. If you use gravel compaction is key as was said. make sure you dont leave any thing actually flat, water should always run.(away from any structures). As far as your garage slab, you could use any gravel with proper compaction. If you really want to make sure that there's no cracking in the future I suggest processed concrete. (6" to 12") again well compacted.
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Old 10-02-2008, 08:07 PM   #5
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Backfill for garage


What kind of garage construction? - A stuctural slab with thickened adges or stem wall to natural ground with a 4" floating slab inside?
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Old 10-03-2008, 04:22 AM   #6
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Backfill for garage


Quote:
Originally Posted by concretemasonry View Post
What kind of garage construction? - A stuctural slab with thickened adges or stem wall to natural ground with a 4" floating slab inside?
This is just a regular residential garage slab. A stem wall sits on top the block wall. The block wall is about 5' tall and after backfilled only one row of block will be visible.

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