Foam sealants have revolutionized
home insulation and weatherization.
They now fulfill a long list of tasks:
sealing window and door jambs, sealing
wiring and pipe penetrations
through the building shell, and most
recently, sealing out radon from basements.
Occasionally, the sealants have
even been used to insulate the upper
sections of foundation walls and the
backs of spas and pools.
Unfortunately, foam sealants are
aerosols and use chlorofluorocarbons
(CFCs) as foaming agents. CFCs have
been linked to ozone depletion, and
restrictions on their production went
into effect on January 1, 1989. The
foam sealant industry is waiting for
major chemical manufacturers to find
alternative foaming agents, but one
manufacturer has already introduced
an "ozone-friendly" foam sealant. I've
tested it and I'll give