if the maker states something and you want to do the opposite, i'd think
you'd want to ask the maker why they make the statement. they must have a
reason for making that statement.
any particular reason you'd trust the responses from a newsgroup over the
maker of the product?
I tend to agree, when I ripped out my mica counter tops (from 1963) it was
because we wanted something different, not because the plywood substrate
Maybe new plywood sucks but this stuff did fine.
Ply will work, but be aware that there are various grades of ply. You
probably want furniture grade which has a smooth flat surface (like
MDF). The MDF is very inexpensive compared to furniture-grade ply.
A/C seems to work OK. Just stay away from "sheathing" grades.
With the ridiculous price of plywood these days that seems hard though.
BTW MDF is not that "saw dust and glue" particle board crap they sell at the
Formica on plywood was standard for years. Are you sure that the
manufacturer said never put it on plywood or to use caution. There
is a problem if the plywood has voids (incomplete coverage by a
layer). Then when you glue the formica and pound on it, you may break
the formica as it bends into the void. Breakage can obviously be
avoided by using a larger block for pressing (pounding) the formica to
the substrate, simply not pounding, or using a better grade of
If the manufacture truly say not to use plywood, it may be that they
consider current plywood of sufficiently poor grade that it should be
Contra-indicated? You sure this wasn't a medical or military site?
Plywood used to be the recommended substrate. Then along came MDF,
which is more stable and smoother with no voids or breaks. MDF
doesn't delaminate either.
Plywood works. MDF usually works better. A/C ply, preferably marine
grade in a wet area such as around a sink. I've used 5/8" PTS
underlay before as well, and the counter was still doing fine after
"contra-indicated"......only a term a medical professional would
use.....hire a professional installer and go with what he says......a
"physician" can't stand his "all mighty" opinion being
challenged.......that's why they call it " a practice" !
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