Marine Grade Plywood Question

[Jerry Hahn]

Our local lumber store carries some. If I remember correctly, the 1/2 marine
grade was around $50/sheet.
Jerry

--
You can lead me to the water, but not away from it.
<boyd...@bellsouth.net> wrote in message
news:3991ee58...@news1.lig.bellsouth.net...
> Hello everyone,
>
> Please reply via email as it takes me forever to download all of the
> messages in this group
>
> Where can I buy marine grade plywood? I have called several lumber
> yards and home improvement warehouses and no one carries it.
>
> Also what price should I expect to pay for a sheet?
>
> Thanks in advance
>
> Rob
> boyd...@bellsouth.net

[boyd...@bellsouth.net]

[JPM]

What is "marine grade" plywood used for?

I have a cut sheet of plywood that serves as the platform for seat cushions
in the cockpit. The current plywood is on it's last season as it is rotting
away. I have not looked closely but it seems that it is either painted or
coated with some dark stain. As it deteriorates it leaves a nasty stain
that is tough to clean.

Is this marine plywood? Can I get away with treated lumber to replace it?

Thanks.

Jerry Hahn <jerry...@email.msn.com> wrote in message
news:uNYq8rnAAHA.250@cpmsnbbsa09...

> Our local lumber store carries some. If I remember correctly, the 1/2
marine
> grade was around $50/sheet.
> Jerry
>
> --
> You can lead me to the water, but not away from it.
> <boyd...@bellsouth.net> wrote in message
> news:3991ee58...@news1.lig.bellsouth.net...

[George Jefferson]

:Is this marine plywood? Can I get away with treated lumber to replace it?

'treated' ply is usually a pretty low grade wood. Use 'exterior grade'
and seal it well. Good exterior will have very few, but
some, voids, that is when you cut it you see some gaps where inner
plys had a knot hole or whatever. Seal the edges and you are ok
for a seat bottom or floor etc. I've only worked with real marine ply
once because someone gave it to me, cut it any way you like and
the end grains looked so good I wanted to wet sand and varnish. I don't
think that quality is worth the expense for most applications though.

--
george jefferson : geo...@sol1.lrsm.upenn.edu
to reply simply press "r"
-- I hate editing addresses more than I hate the spam!

[JPM]

Thanks for the quick response!

Any advice on epoxy / sealant ?

George Jefferson <geo...@sol1.lrsm.upenn.edu> wrote in message
news:8mv0og$u04$1...@netnews.upenn.edu...

[Steve Weingart]

J...@atlanticdesign.com (JPM) wrote in <7sEk5.1850$xQ5....@typhoon2.ba-
dsg.net>:

>Thanks for the quick response!
>
>Any advice on epoxy / sealant ?
>

West System Products are very good and available at most West Marine stores
(I've used their products and they work fine). Raka epoxies www.raka.com
are very popular too and have a very good rep (I have not used them).

The West System booklet, for about $3 at most marine stores is a great
source of info/instructions.

Steve

[tim banse]

ahem. Is there a difference in core materials between exterior and marine
grade?

what is the moisture content of ptp (pressure treated) plywood.

Igor wrote in message ...
>You absolutely can get by with using exterior grade plywood. Just get it
>epoxy coated properly. Treated is probbaly better, as long as treatment
>does not repel epoxy.
>
>There is no reason to use expensive "marine" plywood, for your
appplication.
>An epoxied exterior grade plywood panel for seat cushions will last more
>than your boat. Just make sure that you do a good job.
>
>

[blackelk]

The real difference in marine plywood from exterior is the core is solid
with no knot holes, both use exterior glue. I used to work for 8 years at
Hoquiam Plywood making plywood, lots of which went to some local boat shops.
Mike

"tim banse" <midd...@avalon.net> wrote in message
news:8n240s$kl7$1...@sword.avalon.net...

[tim banse]

I was asking a rhetorical question.
1. with maringe grade, the core is fir versus hemlock
2. moisture content is much higher with ptp

[Keith A. Lahteine]

Dear Igor : There is a, very good, reason to use, "Marine Grade", rather
than just exterior plywood . Marine Ply guarantees that there will be no voids
between laminates . Unfortunately, exterior plywood is full of these voids which
can compromise the strength and uniform bending ability quite a bit . This fact
alone is reason enough to buy, "Marine", ply . They don't just make it to charge
more money . It, actually, is better than regular exterior ply .

Sincerely : Keith A. Lahteine

Igor wrote:

> You absolutely can get by with using exterior grade plywood. Just get it
> epoxy coated properly. Treated is probbaly better, as long as treatment
> does not repel epoxy.
>
> There is no reason to use expensive "marine" plywood, for your appplication.
> An epoxied exterior grade plywood panel for seat cushions will last more
> than your boat. Just make sure that you do a good job.
>

> igor
>
> JPM <J...@atlanticdesign.com> wrote:
> * What is "marine grade" plywood used for?
> *
> * I have a cut sheet of plywood that serves as the platform for seat cushions
> * in the cockpit. The current plywood is on it's last season as it is rotting
> * away. I have not looked closely but it seems that it is either painted or
> * coated with some dark stain. As it deteriorates it leaves a nasty stain
> * that is tough to clean.
> *
> * Is this marine plywood? Can I get away with treated lumber to replace it?
> *
> * Thanks.
> *
> *
> * Jerry Hahn <jerry...@email.msn.com> wrote in message
> * news:uNYq8rnAAHA.250@cpmsnbbsa09...
> * > Our local lumber store carries some. If I remember correctly, the 1/2
> * marine
> * > grade was around $50/sheet.
> * > Jerry
> * >
> * > --
> * > You can lead me to the water, but not away from it.
> * > <boyd...@bellsouth.net> wrote in message
> * > news:3991ee58...@news1.lig.bellsouth.net...
> * > > Hello everyone,
> * > >
> * > > Please reply via email as it takes me forever to download all of the
> * > > messages in this group
> * > >
> * > > Where can I buy marine grade plywood? I have called several lumber
> * > > yards and home improvement warehouses and no one carries it.
> * > >
> * > > Also what price should I expect to pay for a sheet?
> * > >
> * > > Thanks in advance
> * > >
> * > > Rob
> * > > boyd...@bellsouth.net
> * >
> * >
> *
> *
>
> --
> ***********************************************************************
> Do your algebra homework at http://www.algebra.com
> Solve: x^2+4x+3=0 Plot: y=3*sin(x^2) Ask Questions Word Problems
> http://www.algebra.com
> ***********************************************************************

[Frank Faubert]

At $105.00 CDN a sheet for 3/8 inch, it better be.

Frank

[Brian Mahaney]

I am new to this whole thing, but isn't there a point where you are using a
cannon where a sling shot will adequately do the job? I will certainly be
using marine grade plywood on my hull where it will be bent, precisely
because of the "void" issue. However, the original poster here is just
repairing some seat cushion supports. I don't think any bending will be
required. I'm all for using quality materials, but for practical purposes,
isn't exterior good enough for this application? Not trying to flame, but I
think it is a reasonable question. What other reasons might one use marine
when no bending is required? Any thoughts?

Brian

Keith A. Lahteine <klah...@audiobox.com> wrote in message
news:3995E811...@audiobox.com...

> Dear Igor : There is a, very good, reason to use, "Marine Grade",
rather
> than just exterior plywood . Marine Ply guarantees that there will be no
voids
> between laminates . Unfortunately, exterior plywood is full of these voids
which
> can compromise the strength and uniform bending ability quite a bit . This
fact
> alone is reason enough to buy, "Marine", ply . They don't just make it to
charge
> more money . It, actually, is better than regular exterior ply .
>
>
> Sincerely : Keith A. Lahteine
>

[bmc...@ti.com]

He is not bending it. It is for seat bottoms, not a transom. Regular
exterior (water resistant glue) ply works fine.
Bill