Alright, I have another urgent technical question for everybody to ignore:

I am investigating leakage into an EIFS-clad building, constructed in 1997 in
the Northeast.  A key problem appears to be the use of what has been called
(by a source I consider highly reliable) open cell backer rod at the sealant
joints.

Can anybody direct me to (or give me anecdotal) info on backer rod,
specifically the difference between open and closed cell (it appears to me
that open cell looks like foam rubber and/or a sponge; whereas closed cell
looks like carpet padding); how long has closed cell been available (did open
cell in fact precede closed?); are there legitimate uses for open cell or is
it all useless shit at this point (and if so, since when?).

Thanks ever so much.

Love and kisses,

Ralph

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