Weight of plywood

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Weight of plywood

Postby LashleyT » Wed Jan 19, 2005 10:26 am

There has been some discussion about how much a trailer will weigh. I found a reference for plywood weighing 48.3 pounds per cubic foot. - Tom
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Postby jeffwholmes » Wed Jan 19, 2005 10:56 am

I spoke to the manufacture (Georgia-Pacific) and was told that there 23/32 Ext. grade plywood weighed aprox. 60lb. a sheet.
That is 1.875 lb. a square foot. I asked at Lowe’s but no one there could give me a weight so I called the manufacture.
I hope this helps someone.
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Varying weights with the same thickness

Postby Guy » Wed Jan 19, 2005 4:22 pm

I was surprised to see that the weight of plywood, even the same thickness, varies greatly. Here is a link giving some of those weights.
http://www.boulterplywood.com/MarinePlywood_4.htm
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Postby asianflava » Wed Jan 19, 2005 9:17 pm

Lots of good info on that site. I'm interested in that Foam Core plywood.
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Postby Steve Frederick » Wed Jan 19, 2005 9:22 pm

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That's cool! I wonder..... :thinking:
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It has been around for a long time

Postby Guy » Wed Jan 19, 2005 10:26 pm

Dear Steve,

That material is basically a SIP (structural insulated panel) Since there is no air space inside it can span 8ft without any support (Horizontally!!). The only drawback is you cannot put framing inside it, but attaching to the outside is still an option. The styrofoam is placed between two sheets of luan or better then glued under pressure. You will get true R-5 insulation and no thermal bridging. You can make the same panelling with double the R-value by using polyurethane foam sheet. Panels can also be butted together which is what they do when they make houses out of them. For more on their use for houses, including how to make every kind of joint with them check out http://sips.org/

These are now the wrap of choice for timber frame houses back east.

Using these was what I first envisioned when speaking with Andrew.
Last edited by Guy on Wed Jan 19, 2005 10:31 pm, edited 1 time in total.
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Postby BrianB » Wed Jan 19, 2005 10:31 pm

Guy wrote:The only drawback...


I'd say the $200 per sheet pricetag is one, too.
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Postby mikeschn » Thu Jan 20, 2005 6:25 am

I've been toying with the idea of foam panel plywood (SIPs) for a while. Last weekend while sitting in the teardrop it suddenly dawned on me how to make it work...

I'll do up a model soon to share with you guys...

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Postby asianflava » Thu Jan 20, 2005 3:34 pm

$200 a sheet, Wa wa WHAT! Scrap that idea. If I figure out how to bag a panel that big by myself, maybe I should go into buisness just selling panels.
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Postby mikeschn » Thu Jan 20, 2005 4:19 pm

I wouldn't bag it. I would just glue it up with titebond III. I would be sure to have 100 bottles of windshield washer fluid on hand though, to act as clamps!!!

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Postby asianflava » Thu Jan 20, 2005 4:36 pm

Where did you see that? It was model airplane fuel, not windshield washer fluid. :lol:
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Panels are simple

Postby Guy » Thu Jan 20, 2005 9:16 pm

Gentlemen,

Making those panels is a fairly "easy" task.

1. You must have a flat surface. Steve's torsion box workbench would be fine. or if you had a flat floor.

2. You place a piece of put wax paper on the floor to protect glue from sticking the panel to the floor

3. Place a piece of plywood !/8, 3/16/, 1/4 inches on top of the wax paper.(preferably not luan, it may be inexpensive but its cheap in in all the other ways)

4. Coat the plywood with Isocet or Isogrip adhesive frrom Ashland Chemical (the people who make Valvoline for those who do not know Ashland is one of the premeir construction materials manufacturers in the world).

5. Coat one side of a polysyrene or polyurethane rigid foam sheet with the adhesive.

6. Place the foam on top of the plywood.

7. Coat the other side of the foam.

8. Coat one side of another piece of plywood.

9. Staple or tack the sandwich with tape or brads.

10. Place more wax paper.

11. Place tarp or polyethylene sheet on top of the sandwich.

12. Place a children's plastic pool on top of the whole thing letting it hang over the edges.

13. Fill the pool with water.

14. Go to the toilet.

15. 4 Hours later you have a structural insulated panel that is more than ten times stronger in all critical dimensions then the typical two pieces of plywood, wood framing, and insulation.

16. It is also MUCH lighter.

17. It is also much less expensive. since you are not buying framing wood. and you can ust thinner plywood.

18. It is less time consuming as you can see from the above.
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Postby asianflava » Thu Jan 20, 2005 10:34 pm

My panels are pretty much made like that except I used epoxy and I used 3mil plastic instead of waxpaper. The problem with not using framing is that you don't have anything to screw into.
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Agreed

Postby Guy » Thu Jan 20, 2005 10:54 pm

That is the exact problem I spoke of above before folks said "the cost"

My last post was to simply address the cost issue as a non-starter when you made your own.

The "nothing to screw into" is also easily solved by placing wood blocks inside the sandwich when making the panel, switch to a nailess adhesive, or use anchor bolts when needed. Gaps can be filled later with "Great Stuff" or something similar.

By the wa there is a great guy, Jamie, down in El Paso who uses SIPs for his sides and tops. http://www.happitrails.com/

I visited him when I drove across country in November.

BTW If you use epoxy gleue you do not need that much weight to clamp, although it will weaken the structural component a good deal.
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Postby Guest » Fri Jan 21, 2005 2:30 am

Decide where you want your framing, cut the foam to fill the areas in between your framimg and glue it up.
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