upcomming plywood build.

  • We are currently upgrading MFK. thanks! -neo
I would never use OSB. I am highly educated and experienced in construction through both being an architecture major as well as a carpenter and metal fabricator. OSB is meant as a cheap exterior sheathing on walls. It should never be used near moisture due to disintigration and mold. Use a marine grade plywood glued and screwed to each other along the edges as well as the faces of the studs.


NOTE: I know it has worked for other people, but it is not even close to as durable or safe as plywood.
 
I`ll second the no OSB thought. It self destructs when it gets even a little wet on the edges and does not near the strength.
 
You're correct stempy marine grade is not necessary (regualr plywood works), but if I was doing it that is what I would use for the extra factor of safety. You just need to weight the costs vs. the benefits.


Cheap = OSB -> Moderate = Plywood -> Expensive = Marine Grade Plywood

Weak = OSB -> Strong = Plywood -> Strong/Water Resitant (not waterproof) = Marine Grade Plywood
 
OSB, What is that. I did buy plywood from home depot and it's crap! Is that osb wood? The ply's don't hold up well. Had to do quite a bit repairs with wood glue and clamps. It's better now, but I'm not buying that crap again. I'd definitely spend more on better wood next time. I'm glad I decided to use full coverage layers of chop mat and resin for my build.


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OSB stands for oriented strand board. It is composed of wood chips or shavings, depending on who you ask, bonded together with highly toxic resins under high pressure.

Sorry to hear you had problems. Unfortunately Home Depot is known for thier plywood delaminating because it is manufactured in China with cheap glues that are usually water soluble.

If you go to a true lumber yard the standard plywood is much better and rarely if ever delaminates. In addition it will rarely have holes in the layers that you can't see.
 
Student of Architecture said:
OSB stands for oriented strand board. It is composed of wood chips or shavings, depending on who you ask, bonded together with highly toxic resins under high pressure.

Sorry to hear you had problems. Unfortunately Home Depot is known for thier plywood delaminating because it is manufactured in China with cheap glues that are usually water soluble.

If you go to a true lumber yard the standard plywood is much better and rarely if ever delaminates. In addition it will rarely have holes in the layers that you can't see.
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Oh ok, I know what you're talking about now. It like a course particle board. No I would not use that. I will most definitely buy my plywood for my next project from our local lumber yard though. I did check before I started and the plywood @ the lumber yard was about 12.00 more per sheet. I was such a fool to buy home depots plywood. The 60.00 I saved was not worth it.


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It happens to everyone don't be too hard on yourself. I did it when I first got into carpentry years ago. Since then I have payed over double in some cases at a lumber yard just to get a better quality wood product.

surfpalmsncycads - you can use 3/4 and you will be fine. If you properly screw and glue the sheets to each other as well as the studs you will be effectively creating 16" x 4.25" beams through a thing called composite action. It's a bunch of technical stuff that you really don't need to have an in depth explanation of. Trust me I have spent enough time in structures courses listening to the explanations which are very long. Hahaha. I would suggest screws every couple of inches. Don't buy them at home depot. Pay a little more and go to a specialty hardware company.
 
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