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I didn't know this fa about RH and moisture content of wood.
http://luthiersforum.com/forum/viewtopic.php?f=10101&t=57757		 Page 1 of 1
Author:  Colin North [ Sat Jul 18, 2026 5:17 pm ]
Post subject:  I didn't know this fa about RH and moisture content of wood.
The EMC (equalisation moisture content of wood varies not only with the RH of its environment, but even for the same RH, it will vary with the temperature of that environment. It's not a huge difference, but it might make a difference with summer to winter temperature swings temperature swings, for example modal measurements
https://www.woodworkerssource.com/wood-moisture-content.html?srsltid=AfmBOop7OsjWez5DYsRq1SNl_fZMrJKv5HMQ0FqmFeaTwQNKqd2PUxyw
Brock Pauling promised a chart relating to this on FB to anyone requesting it, but I didn't get one despite requesting it. Just found it myself.
Author:  DennisK [ Sun Jul 19, 2026 3:14 am ]
Post subject:  Re: I didn't know this fa about RH and moisture content of w
Good to know. Looks like 30F to 100F is equivalent to about a 5% RH difference.

What makes a bigger difference is the direction of acclimation. Equivalent to about 18% RH difference, i.e. going from tropical humidity down to 50% is equivalent to going from dry winter up to 68%, or going from winter up to 50% is equivalent to going from tropical down to 32%.
Author:  Chris Pile [ Sun Jul 19, 2026 5:54 am ]
Post subject:  Re: I didn't know this fa about RH and moisture content of w
So wood is STILL trying to be alive long after getting cut down.
Author:  Colin North [ Sun Jul 19, 2026 9:25 am ]
Post subject:  Re: I didn't know this fa about RH and moisture content of w
Chris Pile wrote:
So wood is STILL trying to be alive long after getting cut down.

laughing6-hehe
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