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Pulling a vacuum for firebox insulation.

fitter27

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Joined Feb 4, 2017
Read the forum but never post. Working on another stick burner. Previously I’ve used rock wool to insulate the fire box. Worked fine but I was wondering if anyone has ever thought to pull a vacuum instead of filling with insulation? I’m a Pipefitter/welder so sealing it is not an issue and I also have access to equipment to pull a vacuum. Just wondering if anyone has tried this.
 

JJS

Smoking Fanatic
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Joined Mar 17, 2019
trying to hold a static vacuum on steel is very difficult. You could attempt to seal the steel with some kind of coating but you would just be delaying the inevitable. How well you can weld is only a small fraction of the problem, steel is porous and you will lose your vacuum quickly

I guess what I am trying to say is it’s probably gonna be way more of a pain in the ass than it’s worth
 

mike243

Master of the Pit
OTBS Member
SMF Premier Member
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Joined Feb 25, 2018
I would bet it would work pretty good, you will have a port to ck the vacuum and to redo or pressurize and look for a leak, I would think something pretty heavy for the inner layer to keep the warpage down, they have been making vacuum bottles for years
 

fitter27

Newbie
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Joined Feb 4, 2017
Thanks guys for the input. I think I might still try it since I’m just curious. If it doesn’t work I’ll drill some holes and fill it with some high temp expandable foam or something and patch the holes.
 

DoTheEyeThing

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Joined Jun 8, 2021
Thanks guys for the input. I think I might still try it since I’m just curious. If it doesn’t work I’ll drill some holes and fill it with some high temp expandable foam or something and patch the holes.
Did you ever try the vacuum? I was thinking the same thing - I've already got a good vacuum pump. Even if I had to pull it again before each cook that would probably be doable if the benefit was worth it.
 

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