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Posted to rec.woodworking
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Wood Movement: Is this a typo?
DerbyDad03 wrote:
On Monday, August 15, 2016 at 12:02:54 PM UTC-4, Leon wrote:
DerbyDad03 wrote:
Stolen without permission from:
http://www.woodworkerssource.com/shop/wmov.html
"A 36" wide top, made with flat sawn lumber, can move more than an inch
with a 10% change in moisture content."
That comment was included in the following paragraph:
"Allow tops to move freely. Attach tops with Figure 8 Connectors, Z clips,
shop made blocks or elongated screw holes. All of these methods will
securely attach the top but all (sic) it to move across its width. A 36
wide top, made with flat sawn lumber, can move more than an inch with a 10%
change in moisture content."
I'm pretty sure that a Figure 8 connector is not going to handle movement
of "more than an inch" unless it's a *really* big one. ;-)
An inch sounds like a lot ver just 36". But depending on the wood and
amount of moisture content it can happen.
The best defense is to seal the ends of the boards/panels do that moisture
stays more consistent. Sealing all exposed surfaces is even better.
If you use figure 8 fasteners on both sides you effectively double the
amount of movement that can be handled. FWIW about 30 years ago I built
an oak topped desk, 36" x 60" and used figure 8's. No issues so far.
OK, I guess I'll wait a few more years before I continue with my project.
Please keep me updated on the status of the desk top. ;-)
LOL
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