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Kiln dried slab clamping?

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Forum topic by Patrickgeddes14 posted 06-28-2019 10:10 PM 357 views 0 times favorited 12 replies Add to Favorites Watch
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Patrickgeddes14

162 posts in 268 days


06-28-2019 10:10 PM

I have some 1’ wide 2” thick walnut green and I’m bringing it to a firewood drying kiln place and they are going to put the boards underneath the kiln and it will dry it within a day he said. This is a cheap way for me to get it done, I understand proper kiln drying is important and different but I’m not doing it. My question is, would clamping the ends of each board with a metal clamp prevent excess checks and cracks?


12 replies so far

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Delete

439 posts in 825 days


#1 posted 06-28-2019 10:52 PM

No clamping won’t help. Checks and cracks appear as the wood shrinks from drying. If the wood is dryed to fast without good humidity control, checks and cracks will be worse. I think you are setting yourself up for a disappointment if you think you can dry 2” thick wood in one day. One mill that I operated the power house at had a huge battery of dry kilns that produced furniture grade white pine for the manufacturing market. My boilers supplied huge amounts of steam to heat the dry kilns. But not only to heat, but it was also sprayed into the kilns to maintain humidity at a controlled level. Going to quick will distress the wood and you will get more cracks and checks. Some charges took almost a week to reach 10 – 12 % MC. Construction grade kilns go faster and stop at 20 %. Drying green wood in one day will definitely distress it.

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Firewood

887 posts in 2087 days


#2 posted 06-28-2019 11:47 PM

I agree with Carlos. Drying it too fast or improperly can also cause case hardening. I can almost guarantee you will not be happy with the results.

-- Mike - Waukesha, WI

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bondogaposis

5492 posts in 2804 days


#3 posted 06-29-2019 12:51 AM

Sounds like a good way to turn your boards into firewood.

-- Bondo Gaposis

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ibewjon

818 posts in 3246 days


#4 posted 06-29-2019 01:31 AM

++++ for all of the above.

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avsmusic1

477 posts in 1138 days


#5 posted 06-29-2019 02:41 AM

Simply a bad idea

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tomsteve

958 posts in 1672 days


#6 posted 06-29-2019 12:02 PM

go for it. let us know how it comes out and how it is to work.

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Patrickgeddes14

162 posts in 268 days


#7 posted 06-29-2019 04:58 PM

If there is no local place besides them where I can get wood dried and I have to fill all cracks with epoxy it still may be cheaper than finding a proper kiln or having to air dry it, thoughts?

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Firewood

887 posts in 2087 days


#8 posted 06-29-2019 08:39 PM

Some things just can’t be rushed. Drying wood is one of them. Trying to do in 1 day what should take possibly a month in a true wood kiln just doesn’t work.

-- Mike - Waukesha, WI

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BlasterStumps

1363 posts in 892 days


#9 posted 06-29-2019 09:19 PM

If you have a project that you need this lumber for right away, is there a chance you could locate some more Walnut lumber of those dimensions that is already dried and then give the pieces you already have a chance to dry properly.

-- "I build for function first, looks second. Most times I never get around to looks." - Mike, western Colorado

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avsmusic1

477 posts in 1138 days


#10 posted 06-30-2019 01:50 AM



If there is no local place besides them where I can get wood dried and I have to fill all cracks with epoxy it still may be cheaper than finding a proper kiln or having to air dry it, thoughts

Wood that’s dried way too aggressively will be pretty much useless. Not only will is crack to hell, it’ll almost certainly case harden and move a ton while you work it b/c the center won’t really be dry. There is a very high likelihood that your valuable walnut will be completely useless after. Even a 100k vacuum kiln can’t dry 2” green wood in a day.

This is one of those cases where there is a reason people aren’t doing this everywhere

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farmfromkansas

98 posts in 67 days


#11 posted 06-30-2019 02:53 AM

And drying a piece of walnut requires end sealing, or the cracks on the ends will be long.

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ibewjon

818 posts in 3246 days


#12 posted 06-30-2019 04:08 AM

Good lumber like good wine can’t be rushed.

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