marine or boat plywood?
h2o...@hotmail.com
Neither. Use a good grade exterior plywood and cat the bottom side with woodlife
or another preservative or a thin coat of resin. On the top glass it. Marine
plywood will only cost more, not do a better job, for a floor.
dan...@trinity.bomb.mensa.net wrote:
> I'm replacing the deck on my speedboat (17' Regal). In looking around
> to buy the wood, I note there are two grades; marine plywood and boat
> plywood.
>
> What is the difference and which one should I be using?
>
> Daniel http://trinity.mensa.net/danielc
> ----------------------------------------------------
> | Never try to teach a
> The older I get, the more | pig to dance. You just
> intelligent my Dad becomes... | get muddy and it really
> | pisses off the pig.
>
> If you really want to e-mail me, defuse the bomb
> ==============================================================
Classic Boatworks of Maine
You want to use marine grade plywood. It is made with waterproof glue,
and A grade plys all the way thru. I am not sure what you are refering to
with reference to "boat plywood".
Jo Duhaime
Classic Boatworks of Maine
dan...@trinity.bomb.mensa.net wrote in article
<348bc5ae...@news.nova-net.net>...
Bill Munroe
Marine ply uses waterproof glue and perfect laminates. If you use exterior grade it
will have waterproof glue but there will likely be voids in some of the inner lams.
If moisture gets into the voids you will be redoing the work much sooner than you
plan. Considering the time involved in the project and the cost of the other
materials involved, and then decide if the small savings will be worth it. I doubt
if you could find any experts to recommend the use of the exterior ply in this
application.
I suspect that boat plywood is someones idea of a tradename or something. Ask lots
of questions. If there is a significant difference in price be very skeptical.
Bill Munroe
h2o...@hotmail.com wrote:
> Neither. Use a good grade exterior plywood and cat the bottom side with woodlife
> or another preservative or a thin coat of resin. On the top glass it. Marine
> plywood will only cost more, not do a better job, for a floor.
>
> dan...@trinity.bomb.mensa.net wrote:
>
Eugene Gruender x????
On Mon, 8 Dec 1997, Bill Munroe wrote:
> Marine ply uses waterproof glue and perfect laminates. If you use exterior grade it
> will have waterproof glue but there will likely be voids in some of the inner lams.
> If moisture gets into the voids you will be redoing the work much sooner than you
> plan. Considering the time involved in the project and the cost of the other
> materials involved, and then decide if the small savings will be worth it. I doubt
> if you could find any experts to recommend the use of the exterior ply in this
> application.
> I suspect that boat plywood is someones idea of a tradename or something. Ask lots
> of questions. If there is a significant difference in price be very skeptical.
>
> Bill Munroe
>
> h2o...@hotmail.com wrote:
>
> > Neither. Use a good grade exterior plywood and cat the bottom side with woodlife
> > or another preservative or a thin coat of resin. On the top glass it. Marine
> > plywood will only cost more, not do a better job, for a floor.
> >
Not to be sarcastic, but I guess the boat builders aren't experts. I've
rebuilt several boats and haven't found an ounce of marine ply in any of
them. I also haven't found signs that the plywood in any of them were
sealed before installation. Guess if it doesn't show in the showroom,
it's a wasted investment to them.
From the boats I've owned and been around, a sample of 8 or 9, leads me to
believe that the original ply will start falling apart in places in about
7 years, usually from water induced rotting.
The first choice, in my opinion, would be to use marine ply completely
coated in resin, the coating done after cutting and before installation.
Second choice would be to use exterior ply completely coated in resin,
same way.
The third would be to use marine ply and not coat it, but if you're using
marine ply and not completely sealing it with resin, you're wasting your
money.
By the way, the last time I bought marine ply it was more than double the
cost of exterior plywood.
Gene Gruender
Rainbow Chaser
Tom Mosca
Dear Gene,
> Not to be sarcastic, but I guess the boat builders aren't experts. I've
> rebuilt several boats and haven't found an ounce of marine ply in any of
> them.
It depends on the builder. I've worked on many Hatteras' and have
found nothing but marine plywood. That's all I put back in them too.
> By the way, the last time I bought marine ply it was more than double
> the cost of exterior plywood.
You got that right! When people talk about spending "a little bit
more" for marine ply, it seems to indicate they haven't bought any
recently.
Take care, Tom