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Forum topic by docspencer posted 03-12-2016 10:30 PM 916 views 0 times favorited 10 replies Add to Favorites Watch
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docspencer

292 posts in 1412 days


03-12-2016 10:30 PM

My son-in-law found some walnut lumber in his mom’s house – in the crawlspace. He’s excited – as well he should be. He thinks its as dry as its going to get. BTW – he says it was milled 10 years ago. I told him it’s probably not dry enough yet – that he should take it home and store it in his shed where it’s drier and has air movement. There’s a six pack of good beer on the line. Which one of us right?


10 replies so far

View bigblockyeti's profile

bigblockyeti

3668 posts in 1187 days


#1 posted 03-12-2016 10:51 PM

Depends on the average humidity in the crawlspace, what if any air movement there was and how thick the wood was cut. Also depends on whether or not it was stacked properly and stickered.

View bearkatwood's profile

bearkatwood

1214 posts in 478 days


#2 posted 03-12-2016 11:02 PM

I agree, it is based on the RH of the two spaces, so if the crawl space is damp (which they usually are even with a good vapor barrier) and the shop is dry, your in the money or brewski.

-- Brian Noel

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MadMark

978 posts in 920 days


#3 posted 03-12-2016 11:03 PM

Average dry time is 1 yr per inch. 10 yrs is plenty for drying all but rail timbers. If you want to be sure invest in a pin moisture meter:

Walnut is a lighter/softer wood and will dry relatively quickly. Buy him his favorite brew.

M

-- Madmark - Madmark2150@yahoo.com Wiretreefarm.com

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AlaskaGuy

2406 posts in 1776 days


#4 posted 03-13-2016 12:12 AM

The one year per inch is just a rule of thumb and that all it is.

Lumber will only dry to the place it lives. If it lives in Arizona the MC will be much less that if it lives in Florida where the RH is higher.

Like someone said it depends on the RH of the location of the lumber. If the RH changes so does the MC of the wood.

I wouldn’t buy any coffee just yet.

Mark, wood is like a sponge it’s always taking in or giving off moisture depending on the changes in the RH.

-- Alaskan's for Global warming!

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AlaskaGuy

2406 posts in 1776 days


#5 posted 03-13-2016 12:13 AM



I agree, it is based on the RH of the two spaces, so if the crawl space is damp (which they usually are even with a good vapor barrier) and the shop is dry, your in the money or brewski.

- bearkatwood

+1 this is the way it works.

-- Alaskan's for Global warming!

View AlaskaGuy's profile

AlaskaGuy

2406 posts in 1776 days


#6 posted 03-13-2016 12:27 AM


Average dry time is 1 yr per inch. 10 yrs is plenty for drying all but rail timbers. If you want to be sure invest in a pin moisture meter:

Walnut is a lighter/softer wood and will dry relatively quickly. Buy him his favorite brew.

M

- MadMark


As usual Rockler is to high on there prices. I’d buy the moister at HD for much less.

http://www.homedepot.com/p/General-Tools-Pin-Type-Digital-Moisture-Meter-with-LCD-Display-MMD4E/100651808?cm_mmc=Shopping|THD|G|0|G-BASE-PLA-D25T-HandTools|&gclid=CIaOneKzvMsCFQdqfgodL9IIzw&gclsrc=aw.ds

-- Alaskan's for Global warming!

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wood2woodknot

49 posts in 1440 days


#7 posted 03-13-2016 01:05 AM

I would say the ultimate question is has it reached an equilibrium …............ equal to the working RH of his shop …...... and how different is that from the terminal location of the finished product?

-- ajh

View WDHLT15's profile

WDHLT15

1572 posts in 1943 days


#8 posted 03-13-2016 01:38 AM

Doc,

A crawl space is not climate controlled. You are right. Enjoy your brew.

-- Danny Located in Perry, GA. Forester. Wood-Mizer LT40HD35 Sawmill. Nyle L53 Dehumidification Kiln. hamsleyhardwood.com

View LiveEdge's profile

LiveEdge

486 posts in 1087 days


#9 posted 03-13-2016 05:47 PM

Why would the RH of a crawlspace be significantly different than the RH outside? It isn’t controlled and should have air vents for exchange. To me the wood has the equivalent of sitting outside for 10 years without getting rained on.

View tomsteve's profile

tomsteve

394 posts in 686 days


#10 posted 03-13-2016 07:56 PM

ive been in both very dry and very humid crawl spaces. none of us have any idea how the conditions are in that crawl space. be best to get one of them moisture meters and find out what the mc is. best to cut an inch or 2 off an end and check. might even want to cut one in half to check.

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