Radiant floor heat may be easier to
install than you thought. Instead of
using pipes and heating elements
embedded in concrete, with FlexWatt
you simply staple polyester sheets to
the underside of the floor deck and
insulate over them. FlexWatt heating
circuits are made of carbon ink that is
printed on polyester sheets. The system
is not intended as a primary
source of heat but it may provide an
inexpensive amenity in bathrooms or
other places where extra warmth is
appreciated. Sheets are available for
12-, 16-, and 24-inch joist spacings.
Price on a 1,000-watt kit, consisting
of a 100-foot roll of 12-inch-wide
printed plastic, 100 electrical connectors
and insulators, 200 feet of 12-
gauge wire, and special crimpers