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Allowing for Shrinkage and Swelling

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Forum topic by HorizontalMike posted 06-28-2013 09:59 PM 437 views 0 times favorited 4 replies Add to Favorites Watch
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HorizontalMike

6968 posts in 1660 days


06-28-2013 09:59 PM

Topic tags/keywords: shrinkage swelling species allowing for

OK, we all know this happens and that we should always allow for this to happen in our projects.

BUT how much:
  • per inch of width?
  • per Species of wood?
  • in the deep South?... of far North?

All of the literature says to allow for this, but I am lost as to finding any reference source that tells me that a 9in(or 4in, etc) wide pine board will need xxx fraction of an inch of space for expansion/contraction.

Help me out folks, is there a source I am missing, you know… that one source that eludes me?

-- HorizontalMike -- "Woodpeckers understand..."


4 replies so far

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IrreverentJack

724 posts in 1589 days


#1 posted 06-29-2013 02:19 PM

Just quickly I could point you to chapter 7 in Hoadley's -Understanding Wood – ‘Coping with Dimensional Change in Wood’. Matthias Wandel has some info on WoodGears too. Good luck. -Jack

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redSLED

687 posts in 639 days


#2 posted 06-29-2013 04:09 PM

A bathing suit is also important to consider regarding shrinkage and swelling of wood. Considerations may be different in the deep South.

-- Perfection is the difference between too much and not enough.

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robdem

335 posts in 1352 days


#3 posted 06-29-2013 05:27 PM

Mike just looking thru my lee valley catalog they have a wood movement chart Has 73 wood species on it also gives range from 30% to 0% moisture range it’s on page 23

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RPhillips

763 posts in 582 days


#4 posted 06-29-2013 05:58 PM

LMAO! The wife seen this topic and just started laughing….

-- Rob - Indianapolis IN - Learning... one mistake at a time...

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