Slab — thermal break at vehicle roll gate
as I mentioned in a previous post we are putting in a new floating slab on grade in a warehouse building.
the grade has been leveled and sewer drains in trenches and backfilled
then there is a 4-6″ layer of compacted gravel and we plan on using a 15mil taped vapor barrier and 2″ of taped 60psi XPS on top of that.
for a thermal break we are using 2″ 25psi XPS that extends 10″ below the slab
there will be radiant installed throughout the building and we are in
my main question is:
at the garage/roll gates and to a lesser degree the man doors, how should we provide for the thermal break AND maintain structural integrity for any heavy (car/light fork) loads.
as I see it there are a few solutions:
1. do not use a thermal break at the garage/man doors and run rebar between slab and outdoor “driveway”
2. run thermal break with rebar connecting the slab to the driveway ramp, and some sort of control joint channel and fill top with epoxy
one of the concerns I had with the structural aspects of these applications is that if i do not tie the rebar to outside concrete driveway, in our case it’s a ramp, there might be some shifting under a load, even with the 60psi XPS.
any help is great, we are working on some details which i will post when we finish them
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