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View Full Version : Maybe a silly questions, but I need a do-it-yourself boater's opinion



SkyChimp
09-20-2005, 06:38 PM
I've got a Tracker Grizzly 15' aluminum jon boat with a front deck and chair pedestal base.

http://www.trackermarineadcreator.com/media/tracker/images/TU1548AWOH0505_OH_05_500.jpg

I'm going to remove the pedestal base and overlay a precisely cut piece of carpeted plywood on the deck, and remount the pedestal thru the new deck. I'm doing this so I can mount accessories to the new top deck instead of to the underlying aluminum deck.

My plan was to use a 1/2 piece of pressure treated plywood.

Here's the question that may sound silly: pressure treated plywood is treated with a copper salt (copper gives it its green color). Since the wood contains salt, and it will be making direct contact with the underlying aluminum deck, should I use pressure treated plywood? Is this concern silly?

Thanks!

PanMan_VA
09-20-2005, 06:48 PM
You can paint the wood or wrap it in a layer of fiberglass if you are concerned about galvanic corosion.

SkyChimp
09-20-2005, 07:37 PM
As far as I know, you can't get arsenic treated wood anymore. I understand that it out of production in favor of copper treated wood, which is both insect and rot resistant. In fact, you can get copper pressure treated wood that is submersible in salt water - like pilings.

The problem with pressure treated wood is that it's corrosive. You are supposed to use stainless steel or galvanized hardware with it. Now that I've thought about it, it seems that a piece of this stuff lying on an aluminum deck might not be a good thing.

CrappieHead
09-20-2005, 10:57 PM
A small word of advise. Do not just use pressure treated plywood (also called CCA plywood). Use a Maine grade plywood.
CCA plywood from what I understand does not use a maine (waterproof) glue to hold the sheets together. Maine grade plywood uses a waterproof glue. Maine grade plywood is allot higher priced. I priced a sheet of 3/4" maide grade plywood some time back and I think it was over $50 a sheet.

Shellback
09-21-2005, 02:53 AM
From what I understand, you should not use pressure treated where it contacts aluminum. I'd rather use exterior and 2 coat it completely with a waterproof glue. That's what I've done. Rather replace the plywood than an aluminum deck.

Mopar Matt
09-21-2005, 05:24 AM
A CCA treated plywood will work, it has an exterior glue but it is not rated for water submersion like a marine grade of plywood. CCA treatment has been discontinued since Jan 1 of this year so finding some might be a challenge. It has been replaced with ACQ treatment process and the ACQ will corrode all metals except for stainless (and the stainless testing is yet to be finished). I personally would use a new age OSB (like Advantech) they are rated for water submersion and most have a 50 year warranty. They are also a good bit cheaper than a marine grade plywood.

Kokanee King
09-21-2005, 07:11 AM
Go with the marine grade it is a bit more exspecive but it is worth it, then go ahead and wrap it in vinal to make it pretty.

Wardy
09-21-2005, 07:32 AM
Not sure you are going to be able to mount things with out getting into the original deck. If you drill a hole in the plywood, are you not also putting a hole in the deck?

Big Dave 53
09-21-2005, 07:42 AM
I just read a tag from some pressure treated lumber I got at Home Depot and it specifically says to not to place in contact with aluminium...how about marine grade plywood???

SCOUT
09-21-2005, 09:03 AM
I extended the deck of my 15' jonboat and used some left over osb sub flooring from my buddies new house. I dont remember the brand name but I was told it was submersable, it could have been advantech like matt was talking about. I was a bit leary about it so I painted it with some left over fiberglass epoxy resin that I had from building a duck boat. It has held up for a year now and is as good as the day I installed it.

smedley
09-21-2005, 01:05 PM
I'm glad I read this post. I have an older ('82) Bass Tracker and was getting ready to re-do the decks in it. I was at Home Depot today pricing the wood and carpet. I looked at pressure treated but now I don't think I will use that. Would it make more sense just to use a good grade of 3/4" plywood and paint it before I carpet it?

Meat on the Table
09-21-2005, 02:30 PM
Skychimp, there is a site with many experts on rebuilding and remodeling aliminum boats, it is the Aluminum Boat and repair board. Those guys are very experienced in this type of thing. I have seen many posts referring to just your question. It would be worth your while to cruise this site. If you have any problem finding it by search function, get back to me and I will post the address.

Meat on the Table
09-21-2005, 02:31 PM
Skychimp here is the address.http://www.pagebiz.com/bds/aluminum/repair.htm Good luck!!

SkyChimp
09-21-2005, 05:34 PM
Thanks folks. By the way, what is OSB? I'll do a google search on it.

SkyChimp
09-21-2005, 05:41 PM
From what I understand, you should not use pressure treated where it contacts aluminum. I'd rather use exterior and 2 coat it completely with a waterproof glue. That's what I've done. Rather replace the plywood than an aluminum deck.


No question about it. If something gets messed up, it's going to be the wood, not my boat deck.




Not sure you are going to be able to mount things with out getting into the original deck. If you drill a hole in the plywood, are you not also putting a hole in the deck?

Yeah, I've already resigned myself to having to get into the deck some, just as little as possble.

My thought was to cut a wooden deck in the shape of my metal deck. I will carpet the plywood before installing. I will then remove the seat pedestal base. I'll then lay the plywood on the deck and remount the pedestal base on the new deck with srews that run all the way down back thru the plywood and back into the original holes in the deck. This will assist in holding the deck down. I'll use two "L" brackets to assist in holding the back of the deck down. I don't think I will need anything else. The whole thing will require the drilling of just 4 new holes

SkyChimp
09-21-2005, 05:50 PM
Thanks folks. By the way, what is OSB? I'll do a google search on it.

OK, now I know.

SkyChimp
09-21-2005, 06:03 PM
Checked the link and found a good idea just a few entries down. Thanks Meat:

http://www.bassingfools.com/projectsinfo.htm

That boat is a lot smaller than mine, but the principal is about the same.

I think I'll just use regular B/C grade plywood and put a couple of coats of marine eurathane on it before I carpet it. It shouldn't get soaked, or have standing water on it. And if it ever rots, I'll just replace it.

SkyChimp
09-21-2005, 06:40 PM
OK, the more I read that site, the farther I'm staying away from pressure treated wood. Glad I actually gave this some thought. I do a lot of things without thinking them thru, but I'm glad this wasn't one of them.

I suppose there is no danger in regular plywood and aluminum contact? I

Meat on the Table
09-22-2005, 11:28 AM
Very cool site isn't it Chimp. I got good advice and ideas there when I customized my boat. Also the motor forum is very helpful when doing outboard motor maintenance and troubleshooting. Good Luck with the boat and the hook.

ricky
09-22-2005, 11:55 AM
Many years ago I did this. I coated the plywood with Thompson's Water Seal. At the time it was the only thing that could also be painted. If you glue the carpet, that will also give you some protection from the water.