under pad sm insulation

[Mungo Park]

From my reading here about insulating the cement pad you put the vapor barrier down then the insulation down, then the rebar then finally the cement. Is this right so far?
Also do you run the insulation right out until it touches the onside of the cement form?
I live in winnipeg (read the frozen north) so a frost shield is near impossible.
Once the cement is cured, the forums are removed do i put more insulation around the pad, outside, sort of like the forum was?
A company is putting up the garage and I am adding in the insulation.
Cheers Ron.

 

[nate379]

On my house/garage (all on slab) the 2" foam is on the ground about 2' from the slab as well as up the sides.

Forum? Do you mean FORM, as in concrete forms?

 

[tundradude]

Also living in the frozen north, I may be able to offer some help. I had my garage pad plans drawn up by a professional drafter and stamped by an engineer. (had to due to the size)

Assuming this is a detached garage, my pour utilized a thickened edge. Meaning the outer edges of the concrete are 16" thick for 2 feet. Then gradually thinning to 5". Only the 5" part has styrofoam underneath. There is styrofoam run vertically around the entire perimeter, as well as horizontally sloping away from the garage. (for obvious reasons)

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[south pier garage]

vapor barrier always goes on the warm side of the insulation. so if you are in a "heating" climate (north), it goes on the inside and in the south (cooling) it goes on the outside. some concrete guys will tell you that on a floor you don't need it (acts to retard rising damp) but i think that's because they have to wait longer for the concrete to set up than if the water is allowed to run into the ground.

if you find a flatwork contractor who can read for content and retention, he may actually understand why a vapor barrier is important. in 39 years in the trade, i have not been so fortunate.

 

[threewheelin007]

If Im reading correctly for my 21 x 40 slab with hydronic heating(in floor Pex)I will put the insulation on the bare ground and put the plasic vapor barior on top of it, then rebar in that order?I live in NY State Im new and need good teachers Thanks