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Marine Plywood
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David Zielke
Mar 8, 1996, 3:00:00 AM3/8/96
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I had been told at some point in time that currently the only difference
between exterior grade plywood and Marine Plywood is that the Marine Ply
has no voids, i.e. all layers are basically grade A whereas Exterior Ply
has voids which may run long distances.
However, recently I was down in Florida and was told over and over that
Marine Ply has a better glue than Exterior Ply.
Does anyone know for sure?
David Zielke
zie...@starburst.cbl.cees.edu
ELCruiser
Mar 12, 1996, 3:00:00 AM3/12/96
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The glue is the same. The big difference is the number of plys, the
quality of the inner plys and the thickness of the face plys. In true
marine plywood all plys are to be the same thickness (helps prevent
wet/dry cycle delamination), have no interior voids and both faces are
supposed to be "A" grade. Alot of what is sold as marine ply today doesn't
always meet these standards. Real marine ply is worth the extra cost due
to the extra strength (no voids) and better life span of the product.
quality of the inner plys and the thickness of the face plys. In true
marine plywood all plys are to be the same thickness (helps prevent
wet/dry cycle delamination), have no interior voids and both faces are
supposed to be "A" grade. Alot of what is sold as marine ply today doesn't
always meet these standards. Real marine ply is worth the extra cost due
to the extra strength (no voids) and better life span of the product.
Eric
RECARTER
Mar 13, 1996, 3:00:00 AM3/13/96
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I'm not sure, but I recently purchased some plywood from Home Depot that
is marked as Exterior/Marine grade. I've used it for some shelving in
some locker in my boat. It has some voids in it though. I've purchased
some real marine grade, teak faced plywood. It is quite expensive!
is marked as Exterior/Marine grade. I've used it for some shelving in
some locker in my boat. It has some voids in it though. I've purchased
some real marine grade, teak faced plywood. It is quite expensive!
ELCruiser
Mar 13, 1996, 3:00:00 AM3/13/96
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Unfortunately, compliance with the plywood standards is only voluntary for
the manufacturer. For instance not to many years ago an "A" grade face
meant NO veneer repairs. Now some companies allow as many as 5 repairs and
still call it "A". There are a few manufacturers that use the old
standards. The finest Marine ply I have seen is Bruynzeel and SNBCC. Both
are extremely expensive but worth it for critical applications. You
usually end up having to buy it from someone like Harbor Sales and having
it shipped to you. The so-called "Marine Grade" stuff I have seen in
places like Home Depot and other do-it-yourself stores is a poor imitation
indeed. Full of voids and defects, often with thin face veneers. The
really good stuff can run upwards of $125.00 a sheet for 5/8" sheets!
the manufacturer. For instance not to many years ago an "A" grade face
meant NO veneer repairs. Now some companies allow as many as 5 repairs and
still call it "A". There are a few manufacturers that use the old
standards. The finest Marine ply I have seen is Bruynzeel and SNBCC. Both
are extremely expensive but worth it for critical applications. You
usually end up having to buy it from someone like Harbor Sales and having
it shipped to you. The so-called "Marine Grade" stuff I have seen in
places like Home Depot and other do-it-yourself stores is a poor imitation
indeed. Full of voids and defects, often with thin face veneers. The
really good stuff can run upwards of $125.00 a sheet for 5/8" sheets!
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