Swingman wrote:
"RicodJour" wrote in message

The 1/3 cantilever rule of thumb is fine for wood joists and such, but
it's misleading as soon as you change materials or have dissimilar
materials trying to act in concert. I pointed that out to someone and
they got mad.

In your rush to show us your ass, you missed the point entirely.

In the OP's case, the advice of applying a rough approximation of the
cantilever principle has NOTHING to do with "dissimilar materials" and
EVERYTHING to do with attempting a 12" overhang from a 6" counter top!!

Since you missed/ignored it, know that your new hero, who's ass you've been
kissing publicly in this thread, clearly stated the same thing:

Along with other many good points, Swingman hit it right on the nose
when he discussed cantilevering. The brackets move the tipping point
(fulcrum) forward.

The concept of the wREC is not to attempt to blow us away with "wordy" (your
own admission), self imagined intellect, but to provide _practical_ advice
for the OP to use in solving his problem.

Try to keep that in mind ...

You're acting like a little kid.

Bridger gave the correct answer immediately, which was essentially
this:
http://i.timeinc.net/sunset/i/home/2...ns_color_e.jpg
That's not exactly it, but it does show the _only_ way the OP could
support such a raised top above a backsplash, and as Bridger noted, it
could be sandwiched inside to conceal it.

I went off on a tangent, agreed, but the first answer the OP got was
correct. What did I need to add to that? The thread drifted - like
that's never happened before.

I was responding to _your_ comments about cantilevering as they are
misleading.
You wrote:
"A 3/4" plywood substrate is quite sufficient to support a 3/4" thick
granite
"countertop" overhang of 12", providing the plywood substrate is
sufficiently deep (front to back) to be properly "cantilevered" from
the
supporting base/island cabinet."

Quite sufficient? Really? Using plywood to support stone is
insufficient in any cantilever situation.

And you wrote this:
"In doing a granite overhang on an island, I try to use the old "1/3
to 2/3"
cantilever rule as a bare minimum, and much more if I can get away
with it."

That's where the dissimilar materials come in. The plywood over the
base cabinets can be infinitely stiff and the freeboard end of the
plywood cantilever will still deflect more than the granite. You need
to come up with a new rule of thumb - like don't use wood to support a
thin stone slab cantilever.

I've read enough of your posts to know that generally you do know
exactly what you are talking about. This was not one of those times.
I was not trying to **** you off. If someone is in error, it _should_
be pointed out. You do it all of the time. I learn as much as I
instruct on most newsgroups, and I like that part, even if sometimes
the learning is at my expense.

BTW, Robatoy doesn't jump down someone's throat if they disagree with
him. He treats me with respect, I treat him with respect. Unless you
have something of a technical nature to add to the OP's question,
instead of defending your wounded pride, is it okay if we just let
this thread die? Thanks.

R