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Base Concerns For Garage Pad

 
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Old 11-17-2018, 01:12 PM   #1
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Base Concerns For Garage Pad


Hello,

We are doing a garage pad in Niagara falls, ON. A complete excavation was done for footings and foundation and sandy loam was brought in for backfill then a couple loads of gran A, maybe 2-4". This base sat for a year and the sandy loam retained water it seems and is spongy to walk on, a 4 ft radius moves as you walk. I excavated a hole and water filled up the hole in an hour. Any ideas on pouring over this. The garage will have in floor heat, so 2" insulation with 10 guage wire mesh and 1/2" glycol tubing on top. I am going to run 1' dowels along the perimeter. Also it is winter here now so letting the moisture evapourate isnt an option. The building is also framed.
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Old 11-17-2018, 01:18 PM   #2
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Re: Base Concerns For Garage Pad


Why was it backfilled with sandy loam?

If it is as you describe, there is no option but to remove it and backfill with the proper material, i.e., engineered fill, or base rock.

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Old 11-17-2018, 01:19 PM   #3
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Re: Base Concerns For Garage Pad


You list your trade as concrete.

What do you usually use for backfill/base below your slabs?
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Old 11-17-2018, 02:34 PM   #4
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Re: Base Concerns For Garage Pad


A lot of the track builders around here put concrete sono tubes in their garages down to virgin soil so they have less worry about poor compaction under the slab
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Old 11-17-2018, 05:29 PM   #5
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Re: Base Concerns For Garage Pad


Quote:
Originally Posted by Stunt Carpenter View Post
A lot of the track builders around here put concrete sono tubes in their garages down to virgin soil so they have less worry about poor compaction under the slab
Around here they don’t care, the floors sink a couple inches after a few years.
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Old 11-17-2018, 05:31 PM   #6
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Re: Base Concerns For Garage Pad


Always back fill and compact under garage floors with good sand. Then wait as long as possible (at least until there’s roofing) to pour.



I know someone who just started a house and they poured all the flatwork (including driveway) immediately following backfill. That’s going to look great soon.


Cant wait to see how the drive holds up through construction.

Last edited by Big Johnson; 11-17-2018 at 05:33 PM.
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Old 11-18-2018, 11:15 AM   #7
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Re: Base Concerns For Garage Pad


Sono tubes are a good idea. Will probably go that route. We usually throw down 6" or so of granular A under the slab. The slab will be 5" itself. Compact everything with a tamper of course.
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Old 11-18-2018, 11:37 AM   #8
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Re: Base Concerns For Garage Pad


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Around here they donít care, the floors sink a couple inches after a few years.


I donít think itís their choice. Either the cityís required it or new home warranty got involved.

My city started inspecting vb after drywall gets delivered because there was a builder who was pushing the schedule so much the drywall was being hung before vb was finished. First winter people where getting frost on the inside of their drywall
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Old 11-18-2018, 06:55 PM   #9
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Re: Base Concerns For Garage Pad


Quote:
Originally Posted by Big Johnson View Post
Always back fill and compact under garage floors with good sand. Then wait as long as possible (at least until thereís roofing) to pour.



I know someone who just started a house and they poured all the flatwork (including driveway) immediately following backfill. Thatís going to look great soon.


Cant wait to see how the drive holds up through construction.
It will be fine that Moffit will not leave tracks, or that truck dropping off the lumber package will not leak fluid from the crane, and you know dam well the roofing supply co has all brand new trucks, but hey its better to hit the new drive than roll over the cap on the septic tank.

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