However, as good as these efforts were, I think they pale in
comparison with the added benefit that would have resulted had an
additional layer of 1 1/2-inch-thick insulation been installed.
This second insulation layer not only would have doubled the
system's R-value to 18 but could have eliminated thermal shock
through the use of staggered joints in the boards.
It would seem the added costs for labor, insulation, longer
fasteners and perimeter blocking could conceivably be offset
through energy savings given the fact the major electricity
supplier in Allentown will be increasing its rates 30 percent this
year. Although adding insulation may not seem as exotic as a garden
or photovoltaic panels on a roof system, it is "low-hanging fruit"
that easily can be justified from environmental and...
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