 Let's look at some of the advantages of
closed-cell foam. The R-value of foam is twice that of
fiberglass, but that is not where the difference ends. One needs to look at the total
R-value when considering polyurethane foam. The advertised R-value of fiberglass is only
attainable when it is installed perfectly. When there are gaps and voids present as in a
typical field installation, the R-value is significantly reduced (up to 28%)! Any air
movement through these gaps, such as wind, will defeat everything that the insulation is
trying to achieve. When foam is used, it expands around all objects and cracks to seal and
fill these voids, eliminating air movement and therefore retaining
its full R-value.
With all
of the cracks and gaps filled, the air infiltration of the structure is reduced
significantly. So much, in fact, that the building may no longer
need to have "house wrap" installed. The foam is adhered directly to the
structure and there will not be any sagging, settling, or mechanical means of fastening it
in place.
By creating a
"thermal envelope" with foam insulation, the need to vent the roof is also
eliminated. The building codes acknowledge this "hot roof system" as an
approved method.
The structural strength closed-cell
foam adds will allow multiple money-saving options in framing. Studs can be
down-sized and moved to 24" o.c., as well as lighter sheating can be used without
compromising strength.
Today's polyurethane foams are
far different from the old "off-gassing foams" of yesteryear. They are completely
safe and approved by both the Energy Star, and Built Green
organizations. There are also Leed Credits available for
those who use foam.
Another use of foam is as a
waterproof layer. This layer can be used on low-pitch roofs, on foundation walls, and even
as a pond liner.
If all of these aren't enough,
please give us a call and let us help you afford the best insulation available!!
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