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Edward Stammer August 14th 06 05:34 PM

Birch Multi-layerr plywood versus Marine Plywood
 
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 August 14th 06 06:06 PM

Birch Multi-layerr plywood versus Marine Plywood
 
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




August 14th 06 06:09 PM

Birch Multi-layerr plywood versus Marine Plywood
 
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




CS August 14th 06 07:17 PM

Birch Multi-layerr plywood versus Marine Plywood
 

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.


Lew Hodgett August 15th 06 01:50 AM

Birch Multi-layerr plywood versus Marine Plywood
 
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


Lew Hodgett August 15th 06 01:56 AM

Birch Multi-layerr plywood versus Marine Plywood
 
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

August 15th 06 02:27 AM

Birch Multi-layerr plywood versus Marine Plywood
 
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




Lew Hodgett August 15th 06 03:53 AM

Birch Multi-layerr plywood versus Marine Plywood
 
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

James August 15th 06 03:18 PM

Birch Multi-layerr plywood versus Marine Plywood
 
CS wrote:


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.


Take a look at HDO (High Density Overlay) used in outdoor signs. Jim

--


Edward Stammer August 18th 06 02:37 AM

Birch Multi-layerr plywood versus Marine Plywood
 
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





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