How To Fill Large Void Under Concrete Slab?

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Go Back DoItYourself.com Community Forums > Exterior Improvement Center > Bricks, Masonry, Cinder Block, Paving & Walking Stones, Asphalt and Concrete Reload this Page > How to fill large void under concrete slab? Login with Facebook Log in Username Remember Me? Password Register Forgot Password? New Posts Today's Posts FAQ Community
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How to fill large void under concrete slab?

Reply Subscription Subscribe to this Thread Thread Tools Search this Thread #1 Old 04-11-19, 03:16 PM A atikovi Member Thread Starter Join Date: Jun 2005 Location: Suburban Washington DC Posts: 228 Upvotes: 0 Received 4 Upvotes on 2 Posts How to fill large void under concrete slab? There is a large void under the slab of the garage where it meets the asphalt parking lot. Not really sure how the void developed but the opening to it is as big as your foot, and it's size I would guess in the one cubic yard range. I guess I could fill it in with sand or gravel but that wouldn't get it all the way to the top. What about expanding foam like: https://www.youtube.com/watch?v=gWJvrhZlzaM Is this a DIY fix? If not, what companies do this service? Upvote atikovi View Public Profile Find all posts by atikovi #2 Old 04-11-19, 05:57 PM Pilot Dane's Avatar Pilot Dane Group Moderator Join Date: Mar 2003 Location: NC, USA Posts: 31,320 Upvotes: 142 Received 3,153 Upvotes on 2,772 Posts Expanding foam would be my choice. You'll have to search for companies that perform the service. I did it as a DIY and was pretty easy. Upvote Pilot Dane View Public Profile Find all posts by Pilot Dane #3 Old 04-12-19, 05:16 AM pugsl's Avatar pugsl Forum Topic Moderator Join Date: Mar 2008 Location: United States Posts: 8,160 Upvotes: 5 Received 78 Upvotes on 71 Posts If you go with a co. that does this get several estimates. I had some work done and got estimates ferom 500 to 4000.Works great. Upvote pugsl View Public Profile Find all posts by pugsl #4 Old 04-12-19, 06:19 AM B Bud9051 Member Join Date: Oct 2008 Location: New England Posts: 9,459 Upvotes: 79 Received 48 Upvotes on 44 Posts Not sure how the expanding foam will will perform out in the sun and weather. If you fill it with gravel and tamp it through the opening you mentioned it will move towards the far end of the hole. Even if it doesn't fill it completely it will fill in front and provide support. Once you use an expanding foam it could become very difficult to do more filling should erosion continue. Bud Upvote Bud9051 View Public Profile Find all posts by Bud9051 #5 Old 04-12-19, 06:49 AM A aka pedro Member Join Date: Jan 2013 Location: U.S.A. Posts: 1,902 Upvotes: 19 Received 73 Upvotes on 66 Posts I agree with Bud in regard to being able to tamp fill through the hole, but my choice would be pea stone over sand or gravel as it will flow easier and provide better compaction. I think you would find that would provide pretty substantial support by itself, but could always cap it with a lesser amount of foam if you wanted to. Upvote aka pedro View Public Profile Find all posts by aka pedro #6 Old 04-12-19, 08:12 AM H Hal_S Member Join Date: Nov 2012 Location: USA Posts: 2,366 Upvotes: 52 Received 310 Upvotes on 267 Posts I'd start by figuring out where the material went to create the void... Limestone in the area? Could be a tree stump that rotted out, or a contractor using frozen dirt for fill. I'd start by dumping a bag of dry concrete mix down the hole, yes dry mix, no water. Get around 3 feet of tubing, either old car brake line or perhaps plastic compression tubing. Place that in the center of the hole. Get a cubic yard of 2A (clean 2" stone). Backfill the hole with stone, around the tubing. Get a big can of expandable spray foam, securely connect the foam nozzle to the 3 foot tube, and trigger the foam. The expandable foam will slowly spread out THROUGH the gaps in the 2" stone, both lifting the stone up from the bottom, and creating a "foam-crete" of stone aggregate held together by the foam. Pull the tube out, or cut off at the surface. Upvote Hal_S View Public Profile Find all posts by Hal_S #7 Old 04-12-19, 09:36 AM Marq1's Avatar Marq1 Member Join Date: Sep 2016 Location: USA MI Posts: 9,752 Upvotes: 94 Received 1,215 Upvotes on 1,103 Posts First step definitely need to figure out where the material went. It didn't just disappear it some how was washed away. Once that is resolved and if you have a 1' dia opening, start shoveling in sand and small gravel, fill about 4" then hose it down to compact. Repeat as many times as needed to fill the cavity! By watering it down it will remove air, compact the material and you should be able to fill completely. Since you have a hole you may have to open up some but it's going to need repair anyway! Upvote Marq1 View Public Profile Find all posts by Marq1 #8 Old 05-08-19, 06:28 PM A atikovi Member Thread Starter Join Date: Jun 2005 Location: Suburban Washington DC Posts: 228 Upvotes: 0 Received 4 Upvotes on 2 Posts Just getting back to this and stuck a camera into the hole. Upvote atikovi View Public Profile Find all posts by atikovi #9 Old 05-09-19, 06:13 AM Pilot Dane's Avatar Pilot Dane Group Moderator Join Date: Mar 2003 Location: NC, USA Posts: 31,320 Upvotes: 142 Received 3,153 Upvotes on 2,772 Posts Holly cow! That's quite a hole. To save on foam cost I would fill in the hole with clean crushed stone like #57. Stone like that naturally assumes a relatively high compaction. Then use expanding structural foam for the last 4-6" at the top. Upvote Pilot Dane View Public Profile Find all posts by Pilot Dane #10 Old 05-09-19, 06:29 AM A atikovi Member Thread Starter Join Date: Jun 2005 Location: Suburban Washington DC Posts: 228 Upvotes: 0 Received 4 Upvotes on 2 Posts That's about what I was thinking too. I see Lowes has 0.5 cu ft bags of gravel. https://www.lowes.com/pd/Sakrete-0-5...vel/1000489233 Probably need about 10 bags. Upvote atikovi View Public Profile Find all posts by atikovi #11 Old 05-09-19, 11:06 AM Pilot Dane's Avatar Pilot Dane Group Moderator Join Date: Mar 2003 Location: NC, USA Posts: 31,320 Upvotes: 142 Received 3,153 Upvotes on 2,772 Posts What you linked appears to be pea gravel. You do NOT want that. It does not compact or "firm up" unless completely contained. It tends to just roll around like a bag of marbles. You want a crushed stone that has jagged edges. Upvote Pilot Dane View Public Profile Find all posts by Pilot Dane #12 Old 05-09-19, 11:26 AM A atikovi Member Thread Starter Join Date: Jun 2005 Location: Suburban Washington DC Posts: 228 Upvotes: 0 Received 4 Upvotes on 2 Posts OK I'll make sure of that. Upvote atikovi View Public Profile Find all posts by atikovi Related Articles concrete foundation How to Remove a Concrete Slab By Jeff Grundy How to Frame a Concrete Slab How to Frame a Concrete Slab By Justin Stewart A concrete patio with wrought-iron metal chairs. How to Extend a Concrete Patio Slab By Tanya Khan an empty, well lit basement How to Prevent Water From Seeping Under a Slab Floor By Chris Nickson Thread Tools Show Printable Version Show Printable Version Search this Thread Advanced Search

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