Reply by FJPetruso

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Posted on Wood Expansion/ Dissimilar woods

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326 posts in 3911 days

#1 posted 02-21-2009 09:36 PM

A couple of key points in reducing the difference in the expansion of two types of wood in a project… would be to make sure that the different types of wood be brought into the shop well ahead of the start of the project so that the moisture level in the woods has had plenty of time to balance. You should also finish the interior of your project & seal up (as much as practicle) the interior as will as the exterior. Naturally it doesn’t have to look as pretty as the exterior but is should have some finish on it so as to reduce moisture absorbsion.

You know what it’s like to purchase 2×4 lumber at a hardware store only to have it twist while drying out at home. It’s because they store the wood OUTSIDE & only bring it inside just prior to selling the wood. Even if I have a project requiring 2×4s, I bring the wood into the shop, bundle it up into large bunches & bind it up with ratchet straps at both ends & the middle. After several weeks of drying inside, the straps are released & I find much less twisting, winding & warping of the lumber. A project like mics_54 told about is a good example of how important this acclimating time is.

-- Frank, Florissant, Missouri "The New Show-Me Woodshop"

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