Vertical foam by overhead door

[gogolf0401]

To help with the efficiency of my radiant heat I have installed 2" XPS foam around the perimeter of the slab (not poured yet) of my pole barn but I don't have it across the overhead door opening. I'm wondering if it is necessary and if so how have others done it? I assume you'll need to stop the foam at some point and allow the concrete to flow over it so you don't see the foam. If so, how far down do you have it compared to the top of the concrete? TIA!

 

[jack stand]

Generally you'd extend your slab in between the posts where your over head door is out to the finished wall. Some will slope it to the outside in those 7-8", and some like to recess that area by an inch for more protection against rainwater seeping or blowing under the pretty crappy bottom "seal" that's used on today's non wood doors.
Either way you want your under slab insulation across this area for sure.
Even if you thicken this area, drop some foam in there, it's every bit as important as the rest of your perimeter.

 

[Kobuck]

I used 1/2” Wedi tile backer board. It has blue insulation between the cement coated sides. Floated off the top of it for grade.

 

[kj_mustang]

I used 2" xps as my form for the inside pour. Had rebar span from the inside to the outside to tie the two together. After the inside pour cured, cut the foam down to expose about 2" of concrete. Then poured the outside apron. Been driving trucks, cars, tractors over it with no issues.

 

[gogolf0401]

I've heard that you don't want to tie your apron to your indoor slab since during a freeze that can stress your slab and cause it to lift with the apron and/or crack. In warmer climates and different soils maybe less of an issue..

 

[gogolf0401]

I ended up doing this. Insulation is just slightly exposed.