[oletrucks] Dynamat substitue

["Mark Self" <bulletnose@gmail.com>]

Awhile back, a member of tthis list said that you could buy some type
of roofing material at Home Depot, that was virtually identical to
DynaMat.  But, was much, much less expensive.  I've lost the name.
Can someone please tell what this material's name is?  And is it as
good as DynaMat?  Thanks