Two Layer of Plywood

[skibumm101]

When tearing up a small section of deck, i noticed that the deck was comprised of two layers of plywood. The top layer was glassed, but the bottom layer was not. The top layer needed to be replaced, but the bottom layer does not need to be replaced.

Is this normal to have two layers?

1988 reinell 215

 

[Woodonglass]

Re: Two Layer of Plywood

Welcome to iBoats!

I am confused. If the Top section of the Deck needs to be replaced and it was glassed and the bottom section does NOT need to be replaced and it was NOT glassed then the Top section was needing to be replaced because???????? I'm Guessing it was covered with carpet and the carpet over the years got wet which caused minor voids in the glass to allow water penetration into the plywood and caused it to rot but not bad enough to get to the lower section below?? But why would the PO but a Second layer of Ply on the First if it was not BAD in the first place. I'm guessing that if you pulled the entire top deck that the lower deck would have some bad spots in it and the PO put a new top deck over it.

I'm just sayin...

 

[skibumm101]

Re: Two Layer of Plywood

so basically what appeared to have happened is that a chemical(gasoline maybee) was spilled on this section of floor, whatever it was ate through the glass, and then water was able to penetrate this plywood piece. The rest of the deck is in great shape. Just didnt expect to see two layers of 1/2" plywood and was just wondering if that was normal. I am planning on leaving the bottom layer of this one section and just replacing the bad top section(about 2'x3')

 

[Bondo]

Re: Two Layer of Plywood

and was just wondering if that was normal.

Nope,... I believe somebody's been there before you...

 

[skibumm101]

Re: Two Layer of Plywood

so.... is that a fundamental design flaw that needs to have everything replaced, or am i ok in just replacing this one piece.

 

[tmcalavy]

Re: Two Layer of Plywood

Check the under layer carefully for rot. Usually with two plywood decks, both are waterlogged, soft and rotten. Adding an extra top layer is usually a quick fix because the original is toast.

 

[Woodonglass]

Re: Two Layer of Plywood

As I eluded to in my first post. If a Top layer was applied it was there to cover a weak bottom layer. You just happend to uncover a "Good" spot of the bottom layer. The bad news is if the bottom layer was bad it was probably because there was even MORE damage below that so be aware that you could be opening a BIG can of worms if you decide to probe further.

I'm just sayin...

 

[monk-monk]

Re: Two Layer of Plywood

Listen to what they are saying skibumm...Not more than a month ago i submitted a Thread about the surprises one will find when attempting to replace boat decks/floors...one of the worst possible things that can happen (and quite often does) is some inexperienced person tried to make "short cut" repairs years earlier...it leaves you with a total mess to clean up...i just went through this experience...the only time i was happy was when i was finished...AND no boat manufacture is gonna lay down two layers of wood...there would be no reasoning to that...I'll tell you now, take it all up...and pray as you do it...you've heard the old saying "opening a can of worms"...you just popped the lid...!