Insulating Slabs


	THE BEST PLACE TO INSULATE A CONCRETE WALL IS ON THE OUTSIDE OF IT. THIS CAUSES THE CONCRETE TO BECOME PART OF THE THERMAL MASS AND ADDS TO THE COMFORT AND EFFICIENCY OF THE HEATING SYSTEM. WHEN THE INSULATION IS PLACED ON THE INSIDE OF THE WALL IT CAUSES THE CONCRETE TO ACT AS A HEAT SINK.


	PRODUCTS CONTAINING FOIL OR PRODUCTS USING EXPANDED POLYETHYLENE FOAM SHOULD NEVER BE INSTALLED UNDER SLABS!! USING TWO INCHES OR MORE OF HIGH DENSITY FOAM BOARD IS THE ONLY INSULATION UNDER A SLAB THAT IS WORTH ANYTHING IN MY ESTIMATION!! Products that in my estimation are worthless under a slab are RadiantGUARD®, Slab-Shield™, Insul-Tarp™, Reflectix®, TVM rFOIL™, Ultra C B F™, Radiant GUARD™ Although the product called "TheBARRIER^TM does not contain foil, it has a lower "R" value and compressive strength used by itself, compared to 2" of high density Dow StyroFoam, Dur-R10 or Insulworks. Although "TheBarrier" makes several products, the only one with any appreciable under slab insulation value is the "BarrierR5" and could be a good value if used properly. See page 44.


	The performance of radiant barriers in wall and roof assemblies can not be compared to underslab applications. If a distributor or manufacturer intentionally or unintentionally has lead you to believe this conclusion, contact the Federal Trade Commission, toll-free. 1-877-(382-4357)


	Insulworks hydronic heating insulation