Hi -
I have a two-story home with a concrete slab on grade floor with radiant heat. The foundation is a four feet deep (upstate New York) frost line footer. I am putting on a one-story addition on the back of the house and would like a concrete floor with radiant heat in that part of the house as well.
The way I see it, my options and concerns are as follows:
An addition with a four foot frost wall foundation and concrete slab like the rest of the house. I think this would be most solid, but most costly.
A monolithic slab. I'm concerned that this slab butting up against a slab on a frost wall foundation will move up and down during freeze/ thaw periods and cause problems where the roof and walls anchor to the existing house.
A pole framed addition with a concrete slab floor poured separately. Similar concerns to those above, but the cheapest of the three options.
Any thoughts would be appreciated. Thanks.
Barry