sub for marine plywood

[tav]

i know marine ply wood is costly ,is there any other ply wood i can use .
i have a 14' V WITH 3/1 seats ,i want to put a casting deck on the 1st and 2nd seats and then some removable floor , i will have carpet on the wood also, if i don't use m/plywood can i rap the ply in plastic if i'm to use p/t plywood so it dosn't effect the aluminum, any suggestions.

 

[Bob_VT]

Re: sub for marine plywood

Exterior plywood and seal it with poly or epoxy resin. I would not go the PT route and the exterior just might have some voids.

 

[CheapboatKev]

Re: sub for marine plywood

Bob_VT is right (as usual huh Bob?)

Don't wrap in plastic..Do the poly/resin, both sides. I personally dont think carpet and fishing boat go hand in hand, but thats me, I like a bloody deck! lol
May want to do a search on deck replacement/building casting deck..

And most importantly..Welcome Aboard!

 

[tav]

Re: sub for marine plywood

well thanks for the welcome, do you have a link or to on that subject.

 

[CheapboatKev]

Re: sub for marine plywood

well thanks for the welcome, do you have a link or to on that subject.

http://forums.iboats.com/search.php?searchid=3188235


try this

 

[sschefer]

Re: sub for marine plywood

Absoutely do not carpet that casting deck... You will hate yourself for doing it. All you have to do is set a hook on the stuff and it snags.

If you need proof go to Cabela's site and lookup marine carpet. They sell a brand that won't unravell when you remove a hook. To me that say's if your fish, can the carpet idea. Plus..... I carpeted one before I knew better. he he... my bad..

As was mentioned before HD carries what they call sanded one side exterior ply that will work just fine, (in the building buisness we call it ACX) I recommend 3/4" so you can span a wider distance without having to add more support.

If you glass it, you can drop back to 1/2 or even 3/8" but I've found it to be susceptable to warpage (before, not after) and have since switched to nothing but 3/4 and a double coating of Spar polyurethane varnish. I'll let you know in 10 years how that holds up. Starcraft used the same thing on my 18' and it held for 18 years.

 

[erikgreen]

Re: sub for marine plywood

Lately I've been using a couple nice grades of exterior glued ply that have two nice features that let them substitute for marine ply pretty well.

First, there's Arauco ply, which comes from a company in Chile. It's made from plantation grown pine trees, so it's rather ecologically sound, and it's made to have very few voids due to the quality of wood and manufacturing process, which is nice. It's high quality exterior glued, both sides are sanded AC but typically show very few or no knots and few repairs. It's really beautiful wood. Five plies in a 1/2" piece, and cost is about $23 per sheet retail. Comes in 1/4" 1/2" and 3/4".

The second ply is called plyfloor underlayment. This is a floor underlayment made from Baltic birch. It's void free (well, there are one or two 1mm voids in the 6 pieces I've cut so far) and waterproof, consists of five even layers, and is quite flexible. I'm using it for a hull core. Cost is about $27 per sheet retail, and it only comes in 1/4". It has green dyed markings on one side for spacing floor fasteners, but that's not a problem for me.

 

[CATransplant]

Re: sub for marine plywood

Removable floors...between the seats, right? Get 3/4" ACX plywood. Cut it to fit, with nice beveled edges for a better fit (cut 'em with a table saw or even a Skil saw. Drill finger holes near the center of one long edge so you can pull them out to dry the boat out. A rope handle is useful for the same purpose, near one of the long edges.

If you really want to get fancy, make support boards cut to match the shape of the floor and put them under the long edges.

Forget the glassing. Give both sides and all edges a couple of coats of non-slip paint or use Rustoleum and sprinkle it with sand. You can probably match the paint on your boat pretty closely.

These floor panels should last as long as you own the boat...three or four seasons. If you don't get rid of the boat before they get ratty...toss 'em and do it again.

 

[tav]

Re: sub for marine plywood

hey catransplant i think i got the floor idea, it seems pretty cut a dry. now what can i use for a template in making the the deck from the first seat to the small seat at the bow. thanks for the input.

 

[jpmurphy]

Re: sub for marine plywood

hey catransplant i think i got the floor idea, it seems pretty cut a dry. now what can i use for a template in making the the deck from the first seat to the small seat at the bow. thanks for the input.

I am starting the same project this coming weekend.We moved last year and I had the foresight to save all of our wardrobe carboard boxes. I laid one box out flat on the floor, measured the area of the boat that I was starting on and proceeded to cut the cardboard into a lelative shape. This was much easier than putting the entire cardboard piece in the boat. Then I laid the cardboard down in the boat and started trimming the edges until it fit between the sides of the boat. I used this method for the entire "floor" of the boat. If you cut too much in any one place, you always add another piece of cardboard on top of the first piece using duct tape or whatever. I now have a one piece template for the entire boat.

I bought 3/4 " exterior ply from home depot. My floor measures 4' at the widest point so I wanted good support without having to add any support under the new ply. If you have a large piece of scrap ply in 1/2" lay that down to see it will give the support you want.

I applied three coats of wood sealer/preservative to all of the new ply. I then applied one coat of poly/varathane for a sealer. After I cut the ply and do a dry fit to make sure it all fits, I'll seal the cut edges with the poly/varathane, probably a couple of coats, to make sure I have a good seal.

I'm using a hand held jig saw with aplywood blade and when I get to the final cut I'll use a bevel cut so the ply fits snug to the sides of the boat.
I haven't decided if I am going to wrap the carpet or not yet.

Hope this helps.

 

[bowman316]

Re: sub for marine plywood

I am replacing a section of floor in my boat,
and I bought a nice piece of 3/4 inch Pine, and I plan on applying a coat of epoxy resin to all sides, letting it soak in for a good 20 minutes, then putting the resin on the stringers, and using that the glue the wood down.

(I won't put resin on the top, as i plan to glass it in later)

I could have gotten poplar plywood, but it was very heavy, as poplar is a little harder wood, compared to pine.

Pine is one of the softest woods around.

 

[tav]

Re: sub for marine plywood

hi jp ... well thats what i'll be doin this sunday also , i just put in a small floor between the last seat and the transom where the batt. goes.still got to seal it plus the two other floors. i'm useing pine 2x4 then laying down 1/2" plywood, now for the deck i'm gonna 3/4" ply gonna over lap the first seat and then go to the small bow seat(if you call that a seat) and hoping that will be stiff enough to walk on if not gonna have to some how support the floor from underneath.

then i want to add a trap door to put some gear in,(all in time) i do want to add carpet to the floors and deck somthing cheap maybe glue it down or screw it down. any sugestion on supporting the deck if i had to?

 

[jpmurphy]

Re: sub for marine plywood

hi jp ... well thats what i'll be doin this sunday also , i just put in a small floor between the last seat and the transom where the batt. goes.still got to seal it plus the two other floors. i'm useing pine 2x4 then laying down 1/2" plywood, now for the deck i'm gonna 3/4" ply gonna over lap the first seat and then go to the small bow seat(if you call that a seat) and hoping that will be stiff enough to walk on if not gonna have to some how support the floor from underneath.

then i want to add a trap door to put some gear in,(all in time) i do want to add carpet to the floors and deck somthing cheap maybe glue it down or screw it down. any sugestion on supporting the deck if i had to?

I'm thinking you could use a 2x4 between the 2 seats to support the plywood. I would use an "L" bracket to hold the 2x4 in place. 3 at each end. 1 underneath to keep the 2x4 from dropping down, and 1 on either side at the end of the 2x4 to keep it stationary and for added support. I'd use self tapping sheet metal screws to secure the backets. I'd also install the 2x4 in an "up" position (or on edge) rather than flat. You could position the 2x4's so that they act as the ledge for your storage door as well as supporting the plywood.

I haven't reached this point yet, but I have pretty well thought it all out.

 

[willyrocket]

Re: sub for marine plywood

Bob_VT is right (as usual huh Bob?)

Don't wrap in plastic..Do the poly/resin, both sides. I personally dont think carpet and fishing boat go hand in hand, but thats me, I like a bloody deck! lol
May want to do a search on deck replacement/building casting deck..

And most importantly..Welcome Aboard!

Isnt he "technically" wrapping it in plastic by using resin?????

sorry, had to.

 

[tav]

Re: sub for marine plywood

ya the 2x4's up right i will be doing but not with the "L" brackets i'm just gonna screw the plywood down on them, then again i might try them.

 

[tav]

Re: sub for marine plywood

oh by the way when you talk about glassing....what does that mean? and what does that do to ever your doing?

 

[bowman316]

Re: sub for marine plywood

Glassing means laying fiberglass with resin. You basically take a cotton fabric, and soak it in resin, and roll it down, or smooth it flat with a paint brush, and let it dry.

But to weather proof, you can just coat the wood with resin, and use no cloth mat. That is what becomes the glass. the cloth.

 

[tav]

Re: sub for marine plywood

does it add strenght to the wood (deck) i'll bet you it adds wgt. also.

 

[sschefer]

Re: sub for marine plywood

Isnt he "technically" wrapping it in plastic by using resin?????

sorry, had to.

Yeah.. I know it's hard to resist sometimes..... LOL.. Moisture barrier versus sealing is where he's going with that.