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post #21 of 26 (permalink) Old 11-02-2018, 06:03 PM
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Originally Posted by Barry747 View Post
Stick - I copied the 3 pdf's to my woodworking library on my PC. Two of them are good but the MOISTURE CONTENT AND MOVEMENT pdf has the right side of the page cut off. I don't know if it's me or the pdf. Would you please check that and, if it's not me, please repost it. Thanks.
here it is again...
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File Type: pdf MOISTURE CONTENT AND MOVEMENT.pdf (194.0 KB, 22 views)

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”
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post #22 of 26 (permalink) Old 11-02-2018, 08:44 PM Thread Starter
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Stick - came out fine. I'll read all of them over the weekend. Thanks again.
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post #23 of 26 (permalink) Old 11-05-2018, 12:25 AM
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Thought his might be of interest.
Here's a link to world wide wood moisture levels during each month of the year. I live on (near) the coast.
Go to pages 6 and on.
http://www.woodweb.com/knowledge_bas...re_content.pdf
Look at coastal locations, such as Florida or Charleston SC, or Astoria, Oregon. Not much change from January to July
Now look inland to Pendleton, Oregon or Billings, Montana. Lots of moisture changed from summer to winter.

Back to measuring moisture, a wood flooring manufacturer had a novel idea. This won't be easy with a 12 inch wide board, but for small stuff it does work.
Measure a board with dial calipers in 3 or 4 places. mark the measuring locations with tape or a pencil. Wait a few days and remeasure each location. Keep repeating this procedure until there is no change in the measurements.
I did this with a solid oak 3/4" by 3 1/2" T&G floor plank taken from an unheated warehouse. I moved it into a heated indoor office. The wood shrunk as much as a lawnmower's spark plug gap. It took about a week and a half to stabilize.
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post #24 of 26 (permalink) Old 11-05-2018, 12:29 AM
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This is for the book smart people here. It was in the same file as my previous link. Thought it might be interesting to some.
https://www.fpl.fs.fed.us/documnts/f...chapter_13.pdf
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post #25 of 26 (permalink) Old 11-06-2018, 11:23 AM Thread Starter
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Interesting. I'm near Sarasota on FL's west coast. The nearest towns in the table are Tampa and Ft Myers. Taking an average between those two, I come up with a difference of 1.9% RH between the high and low over the year. However, since this table will be in an air conditioned and heated house and the table will have a finish on it, those numbers will be different. I have two temperature/humidity gauges, one in the house and one in my garage shop. Each displays the high and low for the day. Unfortunately, it doesn't retain that info for more than a day. I think I'll set up a spreadsheet and record those daily readings. It will take a year but I'll end up with accurate information. I can also make note of any out of the ordinary occurrences, like hurricanes, which can have an impact on the numbers. I also have a large clock with temp and humidity in the lanai. I can get outside readings from it. Thanks for fostering the idea. I'll post the results next year.
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post #26 of 26 (permalink) Old 11-11-2018, 11:22 PM
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Be interesting to take a piece of 3/4" thick wood and cut it into 2 pieces. Keep one piece indoors and one piece outdoors, covered but not in the rain or direct sun, and checking the moisture content weekly. Indoors probably won't change a lot. At the end of the test, bring the outdoor piece inside and see how long it takes to stabilize.
You could compare the readings to the chart in tha link.
That chart just gave me a bit more confidence when doing that oak stairway. I know the wood moisture content here on the coast doesn't vary all that much. Nobody here runs a humidifier or dehumidifier, so I'd say summer to winter humidity indoors is relatively stable. 20 miles inland from here would have a much different variation in humidity summer to winter.
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