On 7/9/2011 2:02 PM, Existential Angst wrote:
"Jack wrote in message
I have bought 3/4
wolmanized plywood at my home depot, and used it for the walls on my
swimming pool. It has held up fine w/o any finish.
You put this wood IN the pool, to actually contain the water mass??
Details, please!!
Yes, but the pool has a plastic liner so the pool water does not
actually come in contact with ply. It is exposed to the weather though,
and has extreme contact with water from normal spillage and leaks. It is
an above ground, 24x32' pool, and the ply holds in the water.
And I guess this is not that unusual, given wooden-hulled boats, and the
roof-top water tanks you see in NYC.
What types of wood are used in wood boats, water tanks?
I dunno, probably everything from pine to teak. My brother made a canoe
out of orange crate wood 55 years ago, still works, and looks better
than any canoe I've come across.
Yeah, 3/4" is stiffer, but really, there are a myriad of grades of
plywood, and all sorts of different cores for different purposes.
furniture grade is not what you are looking for outdoor use for an
"apparatus" base.
I was under the impression that for a given thickness, the more layers in
the ply, the stiffer it was.
My impression as well. Also, what material is used for the inner layers
has an effect. I've seen everything from solid wood planking to some
sort of clayish looking wood putty stuff.
However, I was actually testing pieces of ply I have laying around, and a
3-layer ply was signficantly stiffer than a piece of 4 layer ply, both 1/2"
I've never seen or heard of a 4 layer ply?. All ply should be odd numbered?
And just now I roughly tested two pieces of 3/4 ply, one with *eleven
layers*, the other with 5, and the 5 layer piece feels a little more rigid!!
Well, I've seen 3 layered ply with 1x4 solid wood planking as the core.
It was stiff.
So I guess that theory is not reliably true.
No, just the number of ply is not the whole enchilada.
My home depot often has great quality plywood at great prices, but not all
the time. Right now they have some sort of "heat treated" stuff on sale
I've never seen before. It's red-ish stuff, I think outdoor.
I'd look into it if I were building an outdoor base for an apparatus.
I'll check it out.
Let us know what you find out.
--
Jack
Fight Socialism.... Buy a Ford!
http://jbstein.com