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Old 11-11-2017, 08:47 PM   #1
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thermal break at garage ramp


designing a new construction detached garage in the frost insulated shallow foundation style. that's 2" thick of XPS wrapping concrete foundation (and below). across the front of the foundation where the garage door will be, how do i make the thermal break to the cement pour ramp?

my working (or not working) idea so far is
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Old 11-11-2017, 09:50 PM   #2
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Re: thermal break at garage ramp


A strip of Donacona board would be as good as anything.
Not sure what you would be calling it down there in Onterrible.
About a half inch thick material that has been soaked in asphalt and used as a separation material between slabs.
And tie the ramp to the slab with rebar stubs.
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Old 11-18-2017, 03:12 PM   #3
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Re: thermal break at garage ramp


that's what you do when there is no 2" thick rigid insulation. the R-value of Donacona board is too low and you'd get major heat leakage, hence the need to wrap the foundation with XPS.. i'm in winter environment, so it matters to me.

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And tie the ramp to the slab with rebar stubs.
OK thanks, was wondering about that
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Old 12-04-2017, 09:14 PM   #4
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Re: thermal break at garage ramp


any suggestions?
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Old 12-05-2017, 06:17 AM   #5
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Re: thermal break at garage ramp


Ayuh,.... Is this a radiant heated slab,..??
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Old 12-05-2017, 06:56 AM   #6
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Re: thermal break at garage ramp


I was curious how others have done this as well. I can say that per your sketch, the thin cross section of concrete above the XPS edge looks like a sure problem for cracking and breaking off.
Maybe run the foam all the way to near surface and cover with a strip off deck plate.
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Old 03-10-2018, 03:27 PM   #7
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Re: thermal break at garage ramp


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Ayuh,.... Is this a radiant heated slab,..??
yes sir
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Old 03-10-2018, 03:31 PM   #8
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Re: thermal break at garage ramp


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Maybe run the foam all the way to near surface and cover with a strip off deck plate.
but i worry for driving over that because its just foam under the plate
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Old 03-10-2018, 04:52 PM   #9
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Re: thermal break at garage ramp


then use heavier deck plate,,, btw, this is the same method used on bridge approach slabs in conc hwys - 2" foam
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Old 03-11-2018, 08:48 AM   #10
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Re: thermal break at garage ramp


Ayuh,.... Simplest answer is a 6" wide, by 3/16" flat steel plate tap-coned over the foam,....
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Old 03-11-2018, 11:49 AM   #11
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Re: thermal break at garage ramp


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Ayuh,.... Simplest answer is a 6" wide, by 3/16" flat steel plate tap-coned over the foam,....

I'd probably set right in the wet concrete while pouring it.
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Old 03-11-2018, 08:18 PM   #12
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Re: thermal break at garage ramp


Ayuh,.... Even better,.....
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Old 05-17-2018, 06:45 PM   #13
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Re: thermal break at garage ramp


thanks all for the tips. i can get some steel plate locally so that's cool.
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