OSB vs Exterior plywood

juniorwoody wrote: You might want to read also Guideoun(sp)Bros

Jack,
I forgot to pull out my Gougeon book yesterday when I got home yesterday. Hopefully, I can find it - I haven't used it since the days when everyone was finding out that the West system bottoms were failing. I'll look for it today.

It may be OSB, but look at the spec. The OSB is hardwood chips in WEST resin. Not the stuff we can go and buy. It's probably better quality than the marine ply we buy.

I followed a ink on the topic in Boat Design.Net. Can't seem to find it now. You might want to read also Guideoun(sp)Bros chapter 5 and what they say about OSB use in the boat building industry. You can make a barn door fly with a large enough airplane engine on it also.

Joe,
All I found in the text is this statement: "the oriented strand board used was special in that it was made of hardwood chips and waterproof resin." Am I missing something about "a special blend in the formula that included more resins"?

juniorwoody wrote: Missing in the presentation is the fact that the owner an OSB manufacturer, used a special blend in the formula that included more resins. You can't buy the stuff.

Jack,
I wondering where you picked up this information? Any documentation?

8122pbrainard wrote: Nice! Miss OSB I like it

Cool boat, but if the guy did not have "stock" in the company would he have made other choices? I am bettig the boat builder has not used it since. Plywood is an engineered product also. Nothing wrong with engineered. LVL is far superior for a header/beam than a standard joist. the question is the superiority of plywood or OSB near water.

Miss OSB - I like it!

Oh Pete. Feelin' for ya on this one. Very interesting thread though.

dont forget advantec    what is that stuff penetrated with?     it does make good underlayment but if it gets soaked befor the roof goes on even that product swells..    Pete a tight budget? come on now you are grasping at straws..

Pete, didn't say no engineered products. Just not OSB for exterior sheathing despite its much lower price compared to CDX. High end homes tend to use a lot of engineered products, but not OSB for the exterior sheathing.

OSB has become standard wall and roof sheathing in typical, average new construction, but high end homes are still specd out with plywood for some reason. Pete, where did you hear about using OSB for marine use?

8122pbrainard wrote: Someone on a real tight budget might be interested.

Shirley, you can't be serious?

Moving right along, here is my last project from 6 years ago. It's my 1964 Mark Twain that I am replacing with the Mustang. When I bought it it needed a total restoration, which I did. Here is the floor when I got it. It was made with an engineered wood product. a beautiful sight to behold in the hold. It was only held together by the glass shell on top. Luckily the boat had hollow core fiberglass stringers so it was just a case of cleaning it up and screwing down a new marine plywood floor treated with CPES. It is much better now!

8122pbrainard wrote: John, You forgot to CPES and put a layer of glass on all the sides of that top you made for your trailer! BTW, that's not OSB but as Joe mentioned incorrectly is waferboard!

That is true, Pete. It is Potlatch OXBoard. Only the lack of orientation is different. I also failed to CPES the sides and they have held up well, except for where the voids have held water.I can't imagine doing a restoration and using a product such ad this to save the price of a case of beer or a 1/4 tank of gas.

John,
You forgot to CPES and put a layer of glass on all the sides of that top you made for your trailer!

BTW, that's not OSB but as Joe mentioned incorrectly is waferboard!