Can you use Green treated plywood on boat floor

I'm replacing the carpet on my boat floor. Under the counsles where the trolling motor batteries are the floor was starting to rot. So I figured I might as well tear the floor up. I know I have seen marine grade plywood in town but they didn't have any. The guy talked me into buying green treated instead of ordering the marine grade.

Question is does the green treated eat away at the alumin in the boat? I have read both ways on the intret saying its a no no and some say its just fine

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riverview
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Joined: Thursday, December 25, 2008 - 7:17pm

I used green treated on a 19 foot crestliner nordic 14 years ago and it hasnt gone soft yet. The guy i sold it to had the fuel tank out and i didnt see any reaction betweent he aluminum stringers and green treated ply wood.

measure-it
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Joined: Tuesday, January 27, 2009 - 4:00pm

Some treated ply will react some to alum., but not often--that was the old,non-pressure treated chemicals--most now is pressure treated.  I would however consider the marine plywood--it's sealed better than treated  ply, and it's composition of laminates makes it stronger per thickness.  It costs way more, but if you are looking to keep the vessel for a long time, it mite be a wise investment.  Either way, cut careful for a snug fit, and good luck. 

rooster77
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Joined: Saturday, January 6, 2007 - 9:29am

I've been reading more and most say definetly dont use green treated when its in contact with alumin. The last few years they have changed the chemicals in the wood and its eats alumin like acid

rooster77
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Joined: Saturday, January 6, 2007 - 9:29am

I wonder if it would be a good idea to take that green treated pieces out and go to regular plywood to be safe???????

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BDub
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Joined: Monday, March 9, 2009 - 9:16pm

 I replaced some of my floor about 10 years ago with the treated plywood. It did end up rotting. So I went to Menards and ordered marine plywood.  It was expensive but much less than the boat shops. Hard to say if it any better but only time will tell. I did use all stainless steel screws to attach it down to the boat. 

Bowhuntin
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Joined: Monday, November 17, 2003 - 12:00am

There are many different grades of treated plywood and lumber, that's the reason there is such a difference in cost. If you read the fine print on a lot of the cheap treated decking material it's only guaranteed against rot if you apply additional treatment every year. If I was going to all the work of replacing a floor I know I'd go with the marine plywood, small additional cost compared to all the labor. 

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BringingTheRain
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Joined: Tuesday, January 5, 2010 - 5:31pm

Green will last years.

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Allen
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Joined: Wednesday, January 9, 2002 - 12:00am

Green treated is not the same as marine grade by any stretch of the imagination.  I had an old aluminum boat that the guy ahead of me fashioned a floor out of green treated plywood for.  After owning the boat for a couple years, I had to replace it.  Then about by year 4 it was looking pretty rough again.

Go with marine grade or don't even bother with all the work.

“Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.” ~ Mark Twain

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wfgoinsptr
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Joined: Sunday, April 28, 2002 - 12:00am

I would not recommend using green treated lumber for the same reason that the building codes required fastners to be hot triple dipped galvinized or stainless steel when used for building. It was found that AC2 has an corrosive affect on standard fastners and I have seen first hand what it can do to aluminum siding.

Go with the marine grade is my opinion.

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fire angel
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Joined: Tuesday, July 15, 2003 - 12:00am

 I was told your best bet was to get a quality exterior plywood and then coat it with a two part epoxy resin before your carpet it. This will seal the wood and last a long time.

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captainmac
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Joined: Friday, April 11, 2008 - 8:32am

no green board              marine all the way "Do it  right the first time"

Always Fishin

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Windsor
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Joined: Thursday, August 1, 2002 - 12:00am

There is a reason for using marine grade plywood. It can handle the heat & humidity that will build up under the floor and the contact of water from above. The layers in green treated will begin to separate within a year unless you have it covered in plastic. Your best option is to use a material that is manufactured by Space Age Synthetics (Fargo ND). They currently make blanks for some boat manufactures and you can purchase from them. The dunage/damaged sheets are the cheapest. This stuff is lighter than plywood and it will never rot. the strength of this stuff is unbelievable. Well worth the investment

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Windsor
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Joined: Thursday, August 1, 2002 - 12:00am

 Use only stainless steel sheet metal screws or aluminum rivets to put the floor in regardless of what material you use. These will not deteriorate. Regular hot dipped or galvanized screws will not hold in aluminum.

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BDub
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Joined: Monday, March 9, 2009 - 9:16pm

For all the work involved in replacing floors, I for a fact will never use green treated ever again. It is not exactly the easiest job. The cost of the plywood is small compared to all the labor to remove and install a new floor. Nothing fun or easy about it.

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Allen
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riverview Said:
I used green treated on a 19 foot crestliner nordic 14 years ago and it hasnt gone soft yet. The guy i sold it to had the fuel tank out and i didnt see any reaction betweent he aluminum stringers and green treated ply wood.

I am pretty sure that the greentreat plywood from that long ago was still arsenic treatment.  The newer stuff came around about 10 yrs ago and no longer uses arsenic, it is this newer stuff that has corrosion issues with metals.

“Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.” ~ Mark Twain

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eyexer
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Joined: Wednesday, February 28, 2007 - 4:42pm

absolutely do not use the new AC2 treated lumber if it comes in contact with aluminum.  It is extremely caustic to all metals especially aluminum (not stainless). 

 

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normp70
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Joined: Wednesday, August 31, 2005 - 3:14pm

whats rough estimate to get your floor professionally redone? 

 Norm

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Sierra1995
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Joined: Sunday, December 23, 2007 - 3:12pm

Yup i used green treated half inch on my starcraft last year. then for carpet i just used the indoor/outdoor stuff from menards, heavier duty carpet.


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eyexer
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Joined: Wednesday, February 28, 2007 - 4:42pm

in another year you probably won't have much for stringers left under the floor I'm sorry to say. 

Sierra1995 Said:
Yup i used green treated half inch on my starcraft last year. then for carpet i just used the indoor/outdoor stuff from menards, heavier duty carpet.