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Author Topic: SYP dry enough to use ?  (Read 270 times)

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Offline arky217

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SYP dry enough to use ?
« on: September 16, 2020, 02:17:30 PM »
I have been milling SYP for a small workshop.
Just finished the last of the siding which was the last thing I milled.

I have a cheap moisture content meter; the pins only go in about 1/4".

The siding I just milled shows 33% MC.
The framing lumber that has been drying for 6 to 8 weeks shows
18% MC.
Is 18% MC dry enough to start using the lumber for framing ?
Arky217

Offline K-Guy

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Re: SYP dry enough to use ?
« Reply #1 on: September 16, 2020, 02:42:37 PM »

That depends on your average relative humidity in your location. If it drys a lot after putting it up, you will have a problem with shrinkage. Construction lumber is dried to 12-20% depending on location by the big mills.
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Offline arky217

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Re: SYP dry enough to use ?
« Reply #2 on: September 16, 2020, 02:54:56 PM »

That depends on your average relative humidity in your location. If it drys a lot after putting it up, you will have a problem with shrinkage. Construction lumber is dried to 12-20% depending on location by the big mills.
I'm near Fort Smith, Arkansas.
The average humidity in Fort Smith for September
is 89% @ 6:00am and 50% @ 3:00pm according to this link:
https://www.currentresults.com/Weather/Arkansas/humidity-by-month.php
Arky217

Offline Ianab

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Re: SYP dry enough to use ?
« Reply #3 on: September 16, 2020, 03:50:52 PM »
For construction use 20% or less is generally considered dry. It will continue to dry in place, but under 20% means no fungus or mold will grow. 

Locally builders like to see the wood down to about 13% before the framing is sealed up with cladding. But that usually happens in place while they work on the roof and exterior cladding. By the time they get around to the interior cladding things are dry enough.

It is possible to build with green lumber, but you have to allow for more movement, and wait longer before things are sealed up.
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Offline K-Guy

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Re: SYP dry enough to use ?
« Reply #4 on: September 16, 2020, 04:20:39 PM »

When looking at the RH for using lumber, you need to consider the year round humidity swing and best is to be in the middle. That way it doesn't shrink as much or expand too much.
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Offline Don P

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Re: SYP dry enough to use ?
« Reply #5 on: September 16, 2020, 05:22:26 PM »
Your framing is fine, KD19 is standard framing and they don't spend to get it any drier than that. The rest happens after we get a lid on the box, until then it is out in the elements. I'd give the siding a good bit more time.
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Offline GeneWengert-WoodDoc

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Re: SYP dry enough to use ?
« Reply #6 on: September 18, 2020, 07:36:06 AM »
For syp, the designation of KD19HT means the interior temperature of the wood was over 133 F for 30 minutes.  This would mean that the air temperature was likely well over 150 F.  In reality, much syp is kiln dried at air temperatures exceeding 220 F.  So, the pitch is set and the surface MC is quite low.
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Offline Don P

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Re: SYP dry enough to use ?
« Reply #7 on: September 18, 2020, 07:54:49 AM »
I believe that would be the HT stamp that typically accompanies the KD19 stamp.
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Offline GeneWengert-WoodDoc

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Re: SYP dry enough to use ?
« Reply #8 on: September 18, 2020, 01:42:34 PM »
HT means over 133 F throughout the piece to kill the pine nematode.  I do believe that the SPIB does not have a  stamp that says KD19 only, but they always have KD19HT.

The "19" means that more than 95% of the pieces are at or under 19% MC at the time of grading .

Interestingly, does KD19HT mean under 19.0%, under 19.5% or under 19.9% MC?
Gene - Author of articles in Sawmill & Woodlot and books: Drying Hardwood Lumber; VA Tech Solar Kiln; Sawing Edging & Trimming Hardwood Lumber. And more

Offline Don P

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Re: SYP dry enough to use ?
« Reply #9 on: September 18, 2020, 05:46:21 PM »
HT= 56c at the core for 30 minutes, this is the APHIS requirement. That stamp means the lumber has been audited to that standard by the grading agency. 

A high temperature kiln is not specially noted on a grade stamp. Never seen one but also note a DH on the stamp does not mean dehumidification kiln.

Rules here;
http://www.alsc.org/greenbook%20collection/WPM_Policy.pdf

A short excerpt from that;
Quote
 Heat Treatment (HT) - lumber or used, previously assembled, repaired or remanufactured wood packaging material which has been placed in a closed chamber and artificial heat added until the lumber or packing achieves a minimum core temperature of 56C for a minimum of 30 minutes. Note: 2013-13 CPM-8 adopted revised Annex 1 to ISPM 15 to include heat treatment using dielectric heating. When lumber or used, previously assembled, repaired or remanufactured wood packaging material is heat treated using dielectric heating the treatment code mark shall be DH. 
A laborer works with his hands
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