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Posted by on January 21, 2008, 10:48 pm
> Hi -
>
> I have a two-story home with a concrete slab on grade floor with
> radiant heat. =A0The foundation is a four feet deep (upstate New York)
> frost line footer. =A0I 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. =A0I think this would be most solid, but
> most costly.
>
> A monolithic slab. =A0I'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. =A0Thanks.
>
> Barry
=46rom a geotech viewpoint, transferring the building load to the same
level of the exisitng building footing should be most appropriate. It
is based on a consolidation behavior of the soil at the existing
footing. If a differential settlement is inevitable, the careful
selection of the founding elevation is very important.
For your case, it is not necessary to construct a perimeter footing.
The most economical way, based on the soil condition at the frost line
(4'), may be concrete/timber piers, plus grade beam and on top of that
floor slab on grade. However, the cost from a local contractor should
be quoted.
Hope this helps.
Bill
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