plywood recommend

I believe P.A. is exterior plywood because of the better quality glues that are used. I've seen 1/2" and 3/4" used in these jobs. Considering all of the supports (and foam?) the 1/2" is probably fine.

We used 5/8 exterior AC fir plywood. I'd think 3/4 would be better for your boat. Fir plywood is far better in quality than regular plywood. I'm surprised HD had that in stock.

Are you sure its fir? I've not seen a fir plywood marketed as a cabinet grade. I have seen lots of imported birch plywood at home depot, and other vendors, marketed as cabinet grade. In my experience these imported panels are poorly made with very little glue in the glue lines and are prone to delamination, I've pulled the venner plys apart simply trying to pick up the panel.

Be sure you are buying what you think you are.

Just stick with the exterior Fir and CPES. Don't worry about what it looks like. It gets covered up anyway!

Tim, I concur, there might be little kid fingers in the Chinese stuff

Look for a lumber yard...an old one.

$$$$$$$$$$$$$$$ and i work 100 feet away from Home Depot.

I gotted baited into it once, if I remember correctly I had to order it and it was 96.00 a sheet,
I believe they are glued the same as normal, and the difference is the finish...normal plywood is just fine for your intended use, no treated.

juniorwoody wrote: Just curious here. Why not get a sheet of marine ply?

Jack,
You have some reading to do to find out all about plywood. Info can be found here as there are plenty of discussions about it. If you really want to get technical, an internet search will bring up all the specs.

It's fine with me if you want to use it but, as mentioned it's just a waste of money!

I'm having a bit of trouble determining what the intended use is in this instance and I won't even take the bait on the statement that marine ply is a waste of money. Might I also add that there are significant differences between the specs on veneer thickness and grain direction and also no voids in marine ply. Pete's standard reply about doing research on this site is short on fact and strong on supposition that there is any information here to educate one at all on this matter. If the application is for hull material and we're talkin only a sheet or too there is a false saving in cutting the corner. Just the facts.

Sorry about the confusion Brian. Don't get hung up on cabinet grade unless you're building in a galley.

My feeling on ply is that it's a framework for the glass. The glass is where your real strength comes in. I was looking for my fir stringers when I found my fir ply. It was clearly a good product(had been there a while, stacked right, etc) and I remembered that Pete liked fir for adhesion. As it turns out, he was spot on.

Once a piece of wood is soaked with CPES and properly buttoned up with glass and epoxy, I figure it'll last as long as I need it to.

Who's Sheldon, Walowitz?

juniorwoody wrote: I'm having a bit of trouble determining what the intended use is in this instance and I won't even take the bait on the statement that marine ply is a waste of money. Might I also add that there are significant differences between the specs on veneer thickness and grain direction and also no voids in marine ply. Pete's standard reply about doing research on this site is short on fact and strong on supposition that there is any information here to educate one at all on this matter. If the application is for hull material and we're talkin only a sheet or too there is a false saving in cutting the corner. Just the facts.

Jack,
Just the facts: I have stated many times in many posts, the difference between marine and other grades!!! Please note that the application here on CCfan is for no foam flooring and some bulkheads These are NOT structural applications!! Your blatant statement about just going with marine led me to believe you did not know the application and you haven't read many of the stringer job threads. Since you know all the facts about marine grade, you too could have explained why you recommended it. Sorry for the confusion.

Greg's statement "ply is a framework for glass" is spot on.

juniorwoody wrote: Hey Pete, Just saying here that the the deck could be built with 3/8 in. Marine ply for a couple hundred bucks. This would provide a good base for the glass as it is a scaffold which bears some structural responsibilities. Please don't underestimate it's importance.

Jack,
I never said the floor doesn't have any structural responsibilities! But, you must understand that a foamed hull only had a layer of glass for it's floor. I feel you are over engineering this ply issue.

BTW, you do understand that CC never even used marine grade ply for their ply hull skins don't you?? It was just a good exterior grade of fir if painted and an import mahogany if bright.

Hey, how's that stem repair going? We haven't seen any updates lately. And, we always love the pictures!

Greg, Sheldon, Leonard and the guy's.....nice catch