timber stability

[Grainger Morris]

Books give radial and tangential shrinkage rates for timber from their green to dry states. Will the dry timber expand at those same rates if the moisture content goes up?

[Doug Miller]

Yep.

-- Regards, Doug Miller (alphageek-at-milmac-dot-com)

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[Andy Dingley]

In the main, yes.

Over time and a number of slow moist/dry cycles, it becomes slower to respond and moves less. This is the difference between drying timber until it's dry, and seasoning timber for even longer (some years) until it's more stable.

[George]

Mostly, as Andy says. Over time the fibers take more and more of a "set," however.

If you trust Yankee technology, try some of this. Timber names may differ, but wood's still cellulose, hemicellulose and lignin.

[P van Rijckevorsel]

green to dry states. Will the dry timber expand at those same rates if the moisture content goes up?

Doug Miller schreef >

*** Strictly speaking: no. There is lagging effect: a piece of wood being dried to 20 % will be more voluminous than a piece of wood taking up moisture to 20%. PvR

[P van Rijckevorsel]

green to dry states. Will the dry timber expand at those same rates if the moisture content goes up?

Doug Miller schreef >

*** Strictly speaking: no. There is lagging effect: a piece of wood being dried to 20 % will take up more volume than a piece of wood taking up moisture to 20%. PvR