Floor perimeter insulation

[jrhaines2]

How do you insulate the perimeter,if you can,around the overhead garage door openings for in floor heat?

 

[Fastback]

I insulated the outside of the foundation wall down to the frost line, and then used expansion material around the inside of the slab so it touches nothing. Anything it touches will leach heat from the slab through convection. Outside of the garage door I used some foam to keep the slab from touching the apron, It's still gravel for now but I used a piece of 2" glued to the slab with gravel pushed up against it. On the entry door I used a special door sill insulator so the door does not sit right on the slab.

I hope that helps answer your question?

 

[koditten]

Ditto Fastback, only thing different is that I found some 4" threshold made of some sort of neoprene rubber to span the width of my overhead doors. The rubber covers up the 2" foam board between the apron and the heated floor. The neoprene rubber is glued to both sections of concrete. The rubber is kind of smooth when new, so I took my angle grinder and roughed up the bottom for the glue to have some "tooth" I used a consruction adhesive called Vulcum 732, if memory serves me correct. To make sure the rubber stayed down wile the glue cured, I placed a 2 x 6 the full length with several cement blocks sitting on top.

I actually bumped it with my snow blower 2 winters ago and did no damage. Whatever that adhesive is, its seems to be good stuff.

 

[Provincial]

I used 3" foam insulation board outside the slab. To bridge over the foam at the garage door I used a piece of 3x3x3/8" angle iron anchored into the ramp concrete with 3/4" rebar stubs. The angle was placed with one leg down and the other extending over the foam toward the garage slab. The rebar stubs were welded on the downward leg and are about a foot long. They angle downward to embed into the middle of the 6" ramp slab. I put four pieces of 2x2x1/4" angle vertical along the garage slab almost touching the big angle to support any flex when a vehicle goes over the gap. I anchored these with 1/2" Red Heads. I made sure the parts don't touch so there won't be a heat transfer.

I may make a cover from aluminum tread plate to pretty it up, but for now the angle just looks industrial.

 

[tdkkart]

My pole building had footings poured under the overhead doors by the original builder. When I prepped for radiant and poured the floor I insulated around the inside perimeter with 2" foam board which I utilized as the form for the concrete. When I got to the doors I dropped the insulation down 2" across the door footings so that some heat would transfer to the footing. With our climate a little bit of heat given up to heat a footing under a door is a good investment

 

[CARS]

I didn't put anything to stop the heat transfer by my overhead door.

I kinda like the way the snow melts a foot away from the door. Then I don't have to get too close with the plow truck or snow blower.

Hell, if I could afford it, I would add pex to my whole parking lot!

 

[jrhaines2]

Thanks for the ideas everyone.No matter how I do it,I am going to suffer some heat loss to the exposed slab.