Does anyone know if cheaper birch plywood with 8 layerrs would be usable as
Marine plywood?

$50 per sheet versus paying approxiamately $100 a sheet.

Ed

If you mean "Baltic" "Finnish" or Russian birch much of it is intended for
furniture and interior cabinet work so it is not made with waterproof glues.
It is super strong but much harder to bend and comes in 50"x50" sheets
rather than 4'x8'.

--
Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com

"Edward Stammer" wrote in message
...
Does anyone know if cheaper birch plywood with 8 layerrs would be usable
as Marine plywood?

$50 per sheet versus paying approxiamately $100 a sheet.

Ed

Glenn Ashmore wrote:
If you mean "Baltic" "Finnish" or Russian birch much of it is
intended for
furniture and interior cabinet work so it is not made with
waterproof glues.
It is super strong but much harder to bend and comes in 50"x50" sheets
rather than 4'x8'.

It's 60"x60" but whose counting, it is totally unrealistic to even
think about it for a marine application.

Lew

Marine plywood is not well defined in every day life.
First, the best way to know if it is a good buy is to do a boil test. Do a
little googling and find out the British Mil specifications.
Normally a good plywood for marine use has no void and can withstand the
boil test.
I usually boil a 2" X 3" plywood sample for about 30 to 45 minutes. Then
I let it air dry for a day. After that if the sample look good and can hold
a screw and nail I take it as good boat building quality.
Start with : http://test.wbdg.org/ccb/FEDMIL/p18066c.pdf
One has to be careful, plywood used for crating is not expensive and has
little value in boat building.


"Edward Stammer" wrote in message
...
Does anyone know if cheaper birch plywood with 8 layerrs would be usable
as Marine plywood?

$50 per sheet versus paying approxiamately $100 a sheet.

Ed

wrote:

Marine plywood is not well defined in every day life.

When my supplier opens up the unit imported from France, he is in the
marine plywood section of the warehouse.

Seems the French are major suppliers of marine plywood.

BTW, if you need marine plywood, don't waste your time trying to find
a substitute.

Just bend over and hope they use Vasoline.

Lew

The situation is that many suppliers are making the claim that their plywood
is of marine grade.
I do not take any chances I ask for a sample piece and give it the boiling
test.
My daughter build a 12 foot sailing dinghy using 5 ply's marine plywood at
more than $100.00 per sheet. Further to that I told her to encapsulate the
plywood pieces and the finished boat three time with epoxy and she did. Her
friend build the same boat with so call marine plywood and only epoxy the
finished boat once. Both boat have been store outside during cold Canadian
winter under snow and hot summer. It has been 12 years now my daughter's
boat look as new while her friend's boat rotten and had to be disposed five
years ago.


"Lew Hodgett" wrote in message
ink.net...
wrote:

Marine plywood is not well defined in every day life.

When my supplier opens up the unit imported from France, he is in the
marine plywood section of the warehouse.

Seems the French are major suppliers of marine plywood.

BTW, if you need marine plywood, don't waste your time trying to find a
substitute.

Just bend over and hope they use Vasoline.

Lew

wrote:
The situation is that many suppliers are making the claim that
their plywood
is of marine grade.
I do not take any chances I ask for a sample piece and give it the
boiling
test.

Good idea if you can't trust the supplier.

I use an industrial supplier with a reputation to protect.

They are not about to crew around for a few $.

My daughter build a 12 foot sailing dinghy using 5 ply's marine
plywood at
more than $100.00 per sheet. Further to that I told her to
encapsulate the
plywood pieces and the finished boat three time with epoxy and she
did. Her
friend build the same boat with so call marine plywood and only
epoxy the
finished boat once. Both boat have been store outside during cold
Canadian
winter under snow and hot summer. It has been 12 years now my
daughter's
boat look as new while her friend's boat rotten and had to be
disposed five
years ago.

That's why the coatings industry exists.

Lew

I agree with the bend over and hope they use Vaseline, especially here in
the Austin, TX area. They are thieves here when it comes to jacking up
prices.

Ed
"Lew Hodgett" wrote in message
ink.net...
wrote:

Marine plywood is not well defined in every day life.

When my supplier opens up the unit imported from France, he is in the
marine plywood section of the warehouse.

Seems the French are major suppliers of marine plywood.

BTW, if you need marine plywood, don't waste your time trying to find a
substitute.

Just bend over and hope they use Vasoline.

Lew

Edward Stammer wrote:

I agree with the bend over and hope they use Vaseline, especially
here in the Austin, TX area. They are thieves here when it comes to
jacking up prices.

Ed
"Lew Hodgett" wrote in message
ink.net...
wrote:

Marine plywood is not well defined in every day life.
Actually HDO (High Density Overlay) for outdoor signs is a good
substitute. A lot of times the sign company will give you a small piece
if thats all you need. The best source is a company that does BLM or
Forest Service signs.

When my supplier opens up the unit imported from France, he is in
the marine plywood section of the warehouse.

Seems the French are major suppliers of marine plywood.

BTW, if you need marine plywood, don't waste your time trying to
find a substitute.

Just bend over and hope they use Vasoline.

Lew



--

Edward Stammer wrote:
Does anyone know if cheaper birch plywood with 8 layerrs would be usable as
Marine plywood?

$50 per sheet versus paying approxiamately $100 a sheet.

Ed

I don't think so - I've had a piece ouside overwinter/summer and it has
delaminated. An adjacent piece of marine ply is still as good as new.