A high, wet wind blew off a half-dozen shingles or shingle parts the
other day. A roofer came out and replaced what was necessary. Another
high, wet wind blew a day later. The replaced shingles were virtually
standing on edge (like speed brakes on a jet plane). After taking a peek
of things, I conclude:
There's a supposedly adhesive strip applied by the manufacturer to the
top side of the shingle, running length-wise edge to edge, sometimes not
solid but rather dashed (as in a dashed line).
This supposedly adhesive strip is probably made out of a tar-like
substance. It's certainly not sticky at 65-degree(F). And there's
certainly not enough of a bead to satisfy my Electronic Engineering sense
of building construction.
So how long does it take for one shingle to adhere to the one below it,
or, at least, what's the best approach to preventing the lifting of "not
yet sticky enough to adhere" shingles?
(Sacramento Valley, California)
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