SB: insulating radiant floors

["Robert T. Wyatt" <rtwyatt@mail.utexas.edu>]

In the northern US, I've heard that you would insulate the bottom of 
a radiant-heat concrete floor to reduce heat loss to the ground in 
winter as well as mitigate excessive condensation in the summer. 
(See first note here for reference: 
http://www.inmadcity.com/solarhemicyclo/sheet3.htm  )

I live in Austin, TX, though.  Would anyone recommend that I insulate 
my radiant concrete slab?

Thanks,

Robert

(I'm in the early, early planning stages, so now's the time to ask 
these things.)

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