44 April 2013
Spray Poly Foam
Continued from previous page
plied SPF as well as the design changes that
accompany altering a home's attic from natural
(passive) ventilation to a sealed mechanically
semi-conditioned attic.
It's very important to understand the speciļ¬c
changes that take place when you seal your at-
tic. There are factors that must be considered,
such as a 50 year old attic with an accumulation
of dust, debris, and possibly pesticides that is
now a sealed attic and part of the indoor envi-
ronment. NOT good. I personally don't feel that
any SPF applicator can clean a 50 year old attic
well enough for me to feel comfortable breath-
ing the now shared attic air that has become
semi-conditioned occupied space. And that is
exactly what will happen when you seal an attic
and semi-condition it.
We'll take a closer look at how to investigate
SPF complaints and how to identify misapplied
SPF. For example, some would prefer to col-
