Marine Grade Plywood Specifications, Sealants

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Author Topic:   Marine Grade Plywood Specifications, Sealants

kutuedan posted 03-21-2010 11:06 AM ET (US)
I'd like to use marine grade plywood as the exterior wall veneer for my house. What specification do I need? Can marine grade plywood be sealed with Behr clear seal that has a dark redish tone? Thanks
ConB posted 03-21-2010 11:28 AM ET (US)
What are you going to do with all the butt joints?
Paint it or it will not look good a few years down the road.
Are you storing your Whaler inside?
Con
Wasatch Whaler posted 03-21-2010 12:55 PM ET (US)
Have you bothered to price marine grade plywood?
I suggest you do that before you pursue this any farther.
pcrussell50 posted 03-21-2010 06:44 PM ET (US)
The gist of marine grade plywood is the quality of its finish, and a lack of, or a lower allowable percentage of those "football" shaped plugs. A lot of professional repairers of small hulls, where the wood will be glassed in anyway on both sides, don't even bother to use marine grade since it's not particularly stronger, except in cases of those voids.
So, since you said you were interested in using it on your house, if the wood will merely be sealed, and still remain in view, or remain to be touched, the high cost of marine stuff may be worth it because of the smooth finish, just as long as it's the smooth finish that you are after. If it will be covered over in drywall or exterior siding, it is a total waste of money.
It should be noted that if you are building a highly stressed structure out of the wood, one that will operate with a narrow margin of safety in the name of light weight, those football shaped plugs are probably not what you want.
-Peter
contender posted 03-21-2010 07:05 PM ET (US)
Use Hardie Board, last longer, easy to maintain, better insulation, no rot. To each his own
jimh posted 03-21-2010 08:45 PM ET (US)
Are you building a boat house?

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Author	Topic: Marine Grade Plywood Specifications, Sealants
kutuedan	posted 03-21-2010 11:06 AM ET (US) I'd like to use marine grade plywood as the exterior wall veneer for my house. What specification do I need? Can marine grade plywood be sealed with Behr clear seal that has a dark redish tone? Thanks
ConB	posted 03-21-2010 11:28 AM ET (US) What are you going to do with all the butt joints? Paint it or it will not look good a few years down the road. Are you storing your Whaler inside? Con
Wasatch Whaler	posted 03-21-2010 12:55 PM ET (US) Have you bothered to price marine grade plywood? I suggest you do that before you pursue this any farther.
pcrussell50	posted 03-21-2010 06:44 PM ET (US) The gist of marine grade plywood is the quality of its finish, and a lack of, or a lower allowable percentage of those "football" shaped plugs. A lot of professional repairers of small hulls, where the wood will be glassed in anyway on both sides, don't even bother to use marine grade since it's not particularly stronger, except in cases of those voids. So, since you said you were interested in using it on your house, if the wood will merely be sealed, and still remain in view, or remain to be touched, the high cost of marine stuff may be worth it because of the smooth finish, just as long as it's the smooth finish that you are after. If it will be covered over in drywall or exterior siding, it is a total waste of money. It should be noted that if you are building a highly stressed structure out of the wood, one that will operate with a narrow margin of safety in the name of light weight, those football shaped plugs are probably not what you want. -Peter
contender	posted 03-21-2010 07:05 PM ET (US) Use Hardie Board, last longer, easy to maintain, better insulation, no rot. To each his own
jimh	posted 03-21-2010 08:45 PM ET (US) Are you building a boat house?