Treated Plywood and metal

[geeco1]

I have an Aluminum boat that I am thinking about replacing the floor in this winter. My question is, will the chemicals in the 'new' type of pressure treated plywood corrode the aluminum. I know that it will eat through nails and screws that are not galvanized, but I'm not sure about aluminum. If it does, what is my next best option. Marine grade is not readily available in my location.

Thanks,
Geeco.

 

[Rickairmedic]

Re: Treated Plywood and metal

Geeco we are gonna need pictures of that Boat what brand is it . Most of us with Tinnies are using plin old exterior grade plywood not treated and coating it with resin on the bottom and sides and laying a layer of glass on the topside before covering with your flooring material of choice .

Rick

 

[geeco1]

Re: Treated Plywood and metal

I'll have to get some pictures. It is a 1988 Blue Fin Sportsman. The previous owner did some plywood replacement but let's just say that he wasn't a carpenter. When I cut holes in the floor to put in pedestal seats, I noticed that the floor has spray foam underneath that is adheared to the wood. I need to replace some of the front deck etc, and some of it is attached to the aluminum framing... hence my original question.

Thanks,
Geeco

 

[Rickairmedic]

Re: Treated Plywood and metal

Ok so its almost a Starcraft at lest on the outside . You will be fine with the Exterior grade plywood you dont want to use PT in a tin boat . LOL if you think your PO was a carpenter wanna be feel free to check out my thread and see the AWESOME aftermarket stringers one of the PO's were nice enough to screw ( through the hull ) in mine .

Rick

 

[geeco1]

Re: Treated Plywood and metal

Thanks for the info. I've only had the boat for about 2 weeks so I'm not looking to do anything with it until the fall/winter. I need to do a complete re-wire as none of the switches work, replace aeration pump, carpet, pads, etc. I already removed the back-to-back seats and replaced with pedestals etc. I am also trying to find out the max Hp rating, as the USCG certification decal is so faded that I can't make it out.

 

[Robj]

Re: Treated Plywood and metal

The treatment that eats Aluminum is ACQ. I agree for a tinny just use plain old exterior grade douglas fir plywood.

Have a great day

Rob.

 

[Rickairmedic]

Re: Treated Plywood and metal

Well welcome to iboats . Theres quite a few of us Tinnie guys here mostly Starcrafts but there are several Bluefins here as well . I am guessing by your boat model that it is 17 feet you can measure from bow tip to transom to make sure . I would say if it is infact 17' then your pretty close with that 85HP force on the back . My 16' Jupiter is only rated for 80 HP.



Rick

 

[geeco1]

Re: Treated Plywood and metal

Yes, it's a 17 footer. I have seen a few just like it for sale, but they never have pictures of the decal. There is one on ebay.... it's an 82 model, and it does show the decal which says 120 hp. Almost all that I have seen come with an 85 hp Force which makes me think that this was the middle-of-the-road stock motor sold with this boat that year.

 

[Rickairmedic]

Re: Treated Plywood and metal

One quick question the one that says 120HP is it an inboard outboard or is it an outboard as that will make a differance . My boat was actually rated for a 60HP inboard /outboard or an 80HP outboard . I would say most likely due to the available HP motors for inboard use.



Rick

 

[geeco1]

Re: Treated Plywood and metal

The decal doesn't specify I/O vs. Outboard. However the picture of the boat shows an outboard.

 

[Jim Haswell]

Re: Treated Plywood and metal

I don't mean to hijack this but I was going to use treated plywood in my "63" starcraft. Your saying DON"T because the chemicals in the wood will react with the alum. What are you putting on the wood? is that top and bottom? Same with transom?
Seems like with the moisture that gets underneath and maybe carpet or vinyl on top that it would rot faster. The old floor lasted for 40 yrs. I want to do this right and only once.
Thanks again as always for any info.
Jim

 

[Rickairmedic]

Re: Treated Plywood and metal

Jim I think your only Hijacking if you change direction of the thread . Most of us with Starcrafts are using plain old Exterior grade Plywood and coating the bottom and sides with Fiberglass resin 2 coats and then topping it once in the boat with resin and cloth. Take a look at Northbeaches completed Resto in the completed section below this one ( for the right way to do it ) . Same thing with the transom coated on all sides with resin.


Rick

 

[sschefer]

Re: Treated Plywood and metal

Leave the treated plywood at the store and just use A/C Exterior Fir. Depending upon how well you take care of your boat and how you store it you can either use a two part resin or a one part poly urethane to coat it with.

I often hear "I only want to do this once". If that's the case then sell the boat as soon as you finish it. Seriously, if you keep the boat you'll always be working on it and that's just the way it is. Replacing the deck is a major maintenance item but it needs to be done periodically. Once every 10 years should not be considered abnormal. 15 would be very lucky and 20 means you never use the boat.