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Author Topic: Does concrete floor need protection in a DH kiln?  (Read 539 times)

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Offline blackhawk

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Does concrete floor need protection in a DH kiln?
« on: October 19, 2022, 10:10:33 AM »
I am building my DH kiln currently.  I poured a monolithic 4" thick insulated concrete pad with plastic installed beneath the slab.  I was just wondering if the moisture pulled out of the lumber would eat away at my concrete floor inside the kiln over time?  If so, what is the best sealer or epoxy coating to use to protect it?

Thanks
Lucas 7-23 with slabber.  Shopbot CNC 48x96

Offline boonesyard

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Re: Does concrete floor need protection in a DH kiln?
« Reply #1 on: October 19, 2022, 10:36:03 AM »
No, heat and moisture evac will not deteriorate your concrete. What is more likely to affect the concrete are the tannins that some woods produce (cedar, oak, walnut, cherry) that will stain the concrete. Tannin staining will penetrate the pores in the concrete and is very difficult to remove unless it is sealed. Concrete is easily sealed using a pump sprayer. There are many products that work well such as Tenon Cure and Seal and BASF Kure-N-Seal, just a couple examples.
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Offline K-Guy

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Re: Does concrete floor need protection in a DH kiln?
« Reply #2 on: October 19, 2022, 11:21:09 AM »

Tannic acid from the lumber will slowly degrade it over time. It will show as a white powder on the floor and take years to show real damage.
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Offline YellowHammer

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Re: Does concrete floor need protection in a DH kiln?
« Reply #3 on: October 19, 2022, 12:39:38 PM »
I have tried lots of things, epoxy coatings, garage floor paint, etc.  After a few years they just degrade or chip off.  The only thing that I have used that really works for years is the aluminized mobile home roofing paint.  I mix that sliver mess up, pour it on the floor, swish it around with a mop, and it finds any floor to wall leaks, low spots, etc and seals them up.  After a few kiln cycles it cures decently hard.  It's a mess but it's easy to apply and it works.  I have pavers on top of my concrete floor that the runners of the pallets sit on when I load with lumber, so nothing really ever touches the concrete.  While it's curing, I just step on the pavers so I don't get the goop on my shoes.
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Offline K-Guy

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Re: Does concrete floor need protection in a DH kiln?
« Reply #4 on: October 19, 2022, 01:07:18 PM »
While it's curing, I just step on the pavers so I don't get the goop on my shoes.


Always looking for the easy way!!! smiley_jester
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Offline YellowHammer

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Re: Does concrete floor need protection in a DH kiln?
« Reply #5 on: October 19, 2022, 03:59:40 PM »
Yep, I'll let others do it the hard way...
YellowHammerisms:

Take steps to save steps.

If it wont roll, its not a log; its still a tree.  Sawmills cut logs, not trees.

Kiln drying wood: When the cookies are burned, theyre burned, and you cant fix them.  So dont burn the cookies.

Sawing is fun for the first couple hundred boards.

Offline blackhawk

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Re: Does concrete floor need protection in a DH kiln?
« Reply #6 on: October 19, 2022, 04:03:56 PM »
Yellowhammer - Do you use something like this Kool Seal product: aluminum paint
Lucas 7-23 with slabber.  Shopbot CNC 48x96

Offline YellowHammer

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Re: Does concrete floor need protection in a DH kiln?
« Reply #7 on: October 19, 2022, 10:14:02 PM »
Yep, that's the goop.  I glop the stuff on the interior walls, also.  Mix it up, pour it out, slop it around and make sure everything is covered.  Put it on pretty thick, but not too thick or it will takes a long time to cure.  That being said, the more it flows on the floor, the more it will find any cracks and crevices, so I just kind to pour it on the floor and swish it around.  The liquid part will soak into the concrete and seal it forever, the aluminized fiber will settle on top of the concrete and provide a solid protective layer.  It's ugly, it messy, it's nasty and it's permanent.  It works great!

Don't step in it for a few weeks or you'll ruin your shoes.   
YellowHammerisms:

Take steps to save steps.

If it wont roll, its not a log; its still a tree.  Sawmills cut logs, not trees.

Kiln drying wood: When the cookies are burned, theyre burned, and you cant fix them.  So dont burn the cookies.

Sawing is fun for the first couple hundred boards.

Offline jimbarry

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Re: Does concrete floor need protection in a DH kiln?
« Reply #8 on: October 20, 2022, 05:22:49 AM »
I just step on the pavers so I don't get the goop on my shoes.


Practicing what he preaches. Literally taking steps (on pavers) to save steps (cleaning boots).


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