I am writing in support of NRCA's position on polyisocyanurate
insulation's thermal-resistance values as explained in "Comparing polyiso R-values," April issue, page 61.
For submittals, my current specifications require a sample of
the insulation board being furnished to a project. This is not
strictly done. The most recent submittal I received offered the
material's label but was dated—in small print—1999.
I also require manufacturers to state the name or names of their
products' principal blowing agents. I recently have received a
manufacturer's letter indicating generic words of no meaningful
value and have required three resubmittals with no improvement. It
is clear the information never will arrive. I have advised the
contractor to save representative samples with packaging labels and
furnish them for reference if necessary. I recommend all purchasers
of new products save all wrappers from every lot or truck with a
matching material sample.
My conversations with people in the industry...
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