[TheForge] under slab heating

[Loktr at aol.com]

Walt
 
What I have is an old warehouse with approx two 4" pours of concrete over 3  
of sand.  Floor level is approximately 2' to 4' over grade.  The room  is 4000 
feet with a 25' ceiling.  The question is whether to insulate the  floor 
under the radiant floor.  I have already decided to bust out a trench  around the 
perimeter and insulate but am stumped at the underside.
 
Ben