The Forestry Forum

General Forestry => Drying and Processing => Topic started by: Bnewman712 on May 25, 2018, 06:47:45 AM

Title: Kiln insulation
Post by: Bnewman712 on May 25, 2018, 06:47:45 AM
Does anyone know if putting celotex thermal polyisocyanurate board on the walls is good? Itís foul faced so seems like it may work even better to reflect the heat in????
Title: Re: Kiln insulation
Post by: WDH on May 25, 2018, 07:36:30 AM
I used it on mine.  Covered it with a vapor barrier then covered that with a layer of 1/2" treated plywood.  If you don't cover it with plywood, you will  knock holes in it or tear it up.

 
(http://forestryforum.com/gallery/albums/userpics/14370/037.JPG?easyrotate_cache=1425299737)
  
Title: Re: Kiln insulation
Post by: Bnewman712 on May 25, 2018, 08:03:48 AM
I will cover it most likely but just thought it may work better not 
Title: Re: Kiln insulation
Post by: WDH on May 25, 2018, 07:06:15 PM
You will definitely tear it. 
Title: Re: Kiln insulation
Post by: Bnewman712 on May 25, 2018, 08:46:26 PM
I used it on mine.  Covered it with a vapor barrier then covered that with a layer of 1/2" treated plywood.  If you don't cover it with plywood, you will  knock holes in it or tear it up.

 
(http://forestryforum.com/gallery/albums/userpics/14370/037.JPG?easyrotate_cache=1425299737)
  
Ok btw how do you like the kd150
Title: Re: Kiln insulation
Post by: GeneWengert-WoodDoc on May 26, 2018, 07:49:20 AM
The foil does not help in a well insulated wall.  It does make a good vapor barrier, but best to also use plastic.
Title: Re: Kiln insulation
Post by: WDH on May 26, 2018, 07:52:30 PM
I have the Nyle version, the L53.  It is the same as the KD150.  Nyle makes both, they are one and the same.  It is a little wood drying beast, for sure.
Title: Re: Kiln insulation
Post by: YellowHammer on May 26, 2018, 11:40:27 PM
I have one also, and it is a good machine.  
Title: Re: Kiln insulation
Post by: Bnewman712 on May 27, 2018, 03:28:26 PM
Cool what does setting pitch mean??  
Title: Re: Kiln insulation
Post by: WDH on May 27, 2018, 08:03:55 PM
Running the temp in the kiln up to 150 degrees or so to make the sticky pitch set and get solid so that it does not ooze pitch on your customers projects.  Just make sure that you turn the compressor off before you set the dry bulb temp at 150 degrees or you will trip the compressor.  Don't ask me how I know this.......... :). 
Title: Re: Kiln insulation
Post by: Bnewman712 on May 27, 2018, 09:07:32 PM
Haha so when itís dry 8-10% I set to 150 to do that for how long? And does not matter what type of wood? And by what do you mean ozz out? 
Title: Re: Kiln insulation
Post by: WDH on May 28, 2018, 07:55:03 AM
Yes, at the end of the drying cycle, turn off the compressor and set the dry bulb temp at 150 degrees.  When the chamber gets to 150 degrees, hold that temp for 24 hours.  This will set the pitch in softwoods and sterilize hardwoods to kill any beetles, larvae, or viable eggs in the wood.

You don't want sticky boards in resinous wood like pine.  You also do not want insects in the wood.
Title: Re: Kiln insulation
Post by: GeneWengert-WoodDoc on May 28, 2018, 08:29:49 AM
The longer you hold the 150 F, the more sap, that would be sticky and/or move, you will evaporate.  I would suggest that 2 days will do a fairly good job.  Note that at this temperature, moisture will evaporate, so try to keep the kiln sealed up as best you can to stop moisture loss.  The greater the moisture loss, the more warp, the more brittleness when machining, and the harder to nail and saw.
Title: Re: Kiln insulation
Post by: Bruno of NH on May 28, 2018, 04:25:40 PM
Do you need the vaper barrier ?
If you tape the joints on the foil face insulation with vaper tape or foil tape?
Bruno
Title: Re: Kiln insulation
Post by: WDH on May 28, 2018, 04:43:20 PM
I would say yes.  Just a cheap way to guarantee a very good vapor barrier.
Title: Re: Kiln insulation
Post by: Bruno of NH on May 29, 2018, 07:41:08 PM
I'm just taking this all in.
I'm going to have a kiln at some point