Garage Floor Pad - Masonry - Contractor Talk

Garage Floor Pad

 
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Old 04-04-2015, 04:10 PM   #1
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Garage Floor Pad


Planning on a 48'x32' pad, with 18"x12" haunch around perimeter. Structure will be 2x6 framed with 2nd floor living area. Question I have is, the ground has roughly 4" of top soil then is shale. Not sure how far down the shale. No soil tests etc.. any ideas or advice from someone who has excavated this type of ground. I also plan on digging for a basement in a yr or so using 12" block then brick veneer from above grade.
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Old 04-04-2015, 04:49 PM   #2
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Re: Garage Floor Pad


An intro and a bit more info is required. Where are you located?

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Old 04-04-2015, 04:56 PM   #3
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Re: Garage Floor Pad


My name is Jesse I have 5acre property just out side Watertown N.Y.. as for more info, I will be building this structure for temporary living space while I build a house on the same lot. Property is completely flat and mostly cleared.
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Old 04-04-2015, 05:21 PM   #4
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Re: Garage Floor Pad


Check with local building codes, not from that area, good luck.
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Old 04-04-2015, 05:22 PM   #5
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Re: Garage Floor Pad


Thanks
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Old 04-04-2015, 06:01 PM   #6
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Re: Garage Floor Pad


Not sure about the local codes in your area, BUT, in my area you need to go below frost line for every footing, no matter what! Houses/garages/decks/stairs/etc.
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Old 04-04-2015, 06:13 PM   #7
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Re: Garage Floor Pad


Here in Toronto we go 4' minimum, image it would be the same more or less in NY.
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Old 04-04-2015, 06:52 PM   #8
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Re: Garage Floor Pad


Even for a floating pad? And yes the frost line is at 4' here, but after this winter, it might as well be at 6'.
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Old 04-04-2015, 06:58 PM   #9
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Re: Garage Floor Pad


Ive built a lot of garages with reinforced haunchs and a slab thickness of 6". Never have any movement or cracks other than in the saw cuts where I want it to crack. Im mainly interested in information about the difficulty I may face with this shale. Expansion ,shear strength, load capacity....
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Old 04-04-2015, 10:11 PM   #10
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Re: Garage Floor Pad


Soils are a complex issue. In subarctic Alaska, shale was sometimes considered safe to build on and ignore frost depth by my engineer.
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Old 04-04-2015, 11:09 PM   #11
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Re: Garage Floor Pad


Shale usually means water, you should get a perc test done.

That said, are you trying to make it a budget build? Slab on grade is generally a no-go for building on in our area. Even mono-pours are tricky and I don't really trust them.

If you are just building a shack to live in while you build a house then call it a hunting camp and do whatever works, just scrape back the top soil, bring in some loads of crusher run and roll it, then pour, build your walls, slap on some trusses and dry it all in.
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Old 04-04-2015, 11:37 PM   #12
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Re: Garage Floor Pad


I think the OP may be talking about a "frost protected shallow foundation". This is an idea that is gaining a lot of traction here in the states and that small country on our north border.

The idea is really intriguing, and would save just tons of cash in the build. It has been the standard construction technique in Norway (I think) for about 40 years.

It is basically slab-on-grade foundation with buried foam insulation in strategic areas. But you guys know that.

Oh wait, I see it is in a garage, probably not heated all year round so I think this frost protected would not work so well.


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Old 04-04-2015, 11:40 PM   #13
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Re: Garage Floor Pad


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Originally Posted by ScipioAfricanus View Post
I think the OP may be talking about a "frost protected shallow foundation". This is an idea that is gaining a lot of traction here in the states and that small country on our north border.

The idea is really intriguing, and would save just tons of cash in the build. It has been the standard construction technique in Norway (I think) for about 40 years.

It is basically slab-on-grade foundation with buried foam insulation in strategic areas. But you guys know that.

Oh wait, I see it is in a garage, probably not heated all year round so I think this frost protected would not work so well.


Andy.
I've done a few. The concept is frost heave happens if you have ALL 3 simultaneously:

freezing soil temps at foundation
moisture
frost susceptible soil

for safety and redundency, FPSFs eliminate all 3.
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Old 04-05-2015, 12:27 AM   #14
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Re: Garage Floor Pad


"Floating" slab = NO TOILETS.

How about a split level house, build the half basement level first with a full bath, kitchenette, bedroom.

I consider 14" CMUs if built a veneered or all masonry house today, room for 3" of insulation and an air cavity, fewer grout cells....

Last edited by Fouthgeneration; 04-05-2015 at 01:32 AM.
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Old 04-05-2015, 12:56 AM   #15
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Re: Garage Floor Pad


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"Floating" slab = NO TOILETS
I disagree. Floating slabs (properly insulated/designed) are good to go for whatever you want.

OP. seek out an energy geek in your area and you guys can run the numbers together to make sure your situation will run.
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Old 04-05-2015, 06:15 AM   #16
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Re: Garage Floor Pad


Thanks guys for the info
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Old 04-05-2015, 06:46 AM   #17
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Re: Garage Floor Pad


I plan insulating the bottom and sides, in floor heat, boiler system.
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Old 04-05-2015, 12:54 PM   #18
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Re: Garage Floor Pad


I see your a mason also...block are cheap put in a proper stem wall to your frost line and be done with it.
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Old 04-05-2015, 01:03 PM   #19
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Re: Garage Floor Pad


I think , to not have any problems in the future I will do that.
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Old 04-05-2015, 02:03 PM   #20
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Re: Garage Floor Pad


Quote:
Originally Posted by JRWMASONRY View Post
I think , to not have any problems in the future I will do that.
I think, to not have any problems in the future, you should consult with someone that knows more about this than you do. Do a proper survey of the soil conditions that you have and design the foundation system of your radiant/hydronic floor heated GARAGE properly.

Andy.

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