--- [EMAIL PROTECTED] wrote:
> In a message dated 1/25/01 7:31:29 AM Mountain
> Standard Time,
> [EMAIL PROTECTED] writes:
>
> << Actually, they orient the strands in OSB in
> alternating layers. Just as
> with
> plywood, they run the chips so the grain runs
> lengthwise in one layer,
> crosswise in another layer, so you get a balanced
> material that's has much
> the same properties as plywood, and is stronger
> than solid lumber.
> >>
> Another touted benefit of OSB over plywood is that
> being a manmade
> composition material, the OSB expands at the same
> rate in both (all?)
> directions, front to back and side to side, as local
> humidity changes.
> Plywood, by contrast, like any other organic
> ("original") wood, expands
> something like 3 to 4 times as much with the grain
> than across the grain
> (that's the concept, I'm not a woodworker so do not
> know the precise ratios,
> but you get the idea). Even though layered
> alternatively, plywood fights
> itself internally to expand and contract at
> different rates for each layer.
> Plywood also has a greater chance of having internal
> voids in the various
> layers where moisture can collect. OSB is
> structurally more stable than
> plywood, which is why it is used behind veneer in
> fine grade furniture and in
> many other applications.
>
> The appearance of OSB reminds me of those
> El-Cheapo chip board storage
> cubes that held my prized round vynal discs in
> college (anyone remember those
> things, records?). Those old cubes would either
> melt or expand grotesquely
> upon contact with water, hence my dislike of them
> and initial apprehension of
> OSB.
>
> Fred C.
> Denver, CO.
>
>
>
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=====
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