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Author Topic: Definition of Kiln-dried  (Read 279 times)

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Offline kelLOGg

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Definition of Kiln-dried
« on: August 18, 2020, 07:40:38 AM »
Weird question but here's what inspires it.

I dry with a domestic DH unit in the kiln that I keep under 100F (~ 88 to 95) and get the MC as low as 7.5%. I remove the DH unit and sterilize to 133K in the core a measured by a thermocouple inserted in the core of a test piece. Then I store it in the 2nd floor of the barn until it is sold. Sometimes it doesn't sell and eventually equilibrates back to 12% MC. 
Do I still have kiln dried wood?
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Offline WDH

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Re: Definition of Kiln-dried
« Reply #1 on: August 18, 2020, 07:43:13 AM »
I would say no.  To me, kiln dried means moisture control below outdoor ambient moisture content. 
Woodmizer LT40HDD35, John Deere 2155, Kubota M5-111, Nyle L53 Dehumidification Kiln, and a passion for all things with leafs, twigs, and bark.  hamsleyhardwood.com

Offline farmfromkansas

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Re: Definition of Kiln-dried
« Reply #2 on: August 18, 2020, 09:35:48 AM »
I was hoping to get a storage container set up this summer, and move my dry lumber into it.  There have been discussions on this board that dry wood stored in a container stays dry, and Doc uses his as his wood dryer with a dehumidifier inside.  So think that is your solution.  Crazy weather has me behind this summer, maybe this fall I can get this done.
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Offline GeneWengert-WoodDoc

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Re: Definition of Kiln-dried
« Reply #3 on: August 18, 2020, 05:20:08 PM »
One might argue that your 100 F DH unit is a kiln and the wood was dried in it, so you have kiln-dried wood.  However, from a legal standpoint, the marketplace has certain expectations when the phrase "kiln dried" is used for hardwoods.  These include the uniformity of MC, the average final MC, the lumber has been dried over 133 F, the relief of any drying stresses, and maybe more.  Even if the lumber was air-dried first, if it was finished in a structure that is called a kiln because it is a building with control temperature, air flow and humidity,, then the lumber can be called kiln dried.  Without the final heat treatment, you would be on thin ice.  Heat treatments are sometimes done in a separate structure, so you are not unusual.  

With softwoods, there are even more exacting standards, including going over 160 F when "kiln dried" phrase is used.
Gene - Author of articles in Sawmill & Woodlot and books: Drying Hardwood Lumber; VA Tech Solar Kiln; Sawing Edging & Trimming Hardwood Lumber. And more


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