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Old 03-15-2010, 08:03 PM   #1
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Default First time mash tun build - opinions on insulation please

Hi all. I am about to start work on my mash tun. I want to be able to direct fire the mash tun so as I can easily perform step mashes.

I also want good insulation to prevent heat loss. My idea is to insulate the sides and the top of the mash tun but to leave the bottom uninsulated so as it can take a direct flame.

My problem has been finding a suitable insulating material. I have seen on this board people recommending armaflex, is this fireproof?

Would using this material

http://www.pipelagging.com/duct-insulation-sheet-aluminium-foil-backed-09mm-p-1099.html

be safe for my purpose?

Cheers, Andrew

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Old 03-15-2010, 08:18 PM   #2
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Quote:
Class 'O' fire category means low fire propagation index producing a zero surface spread of flame for a high degree of fire protection and safety
Sounds good.
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Old 03-15-2010, 08:34 PM   #3
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Fantastic! Looks like it is waterproof as well which will make cleaning the mash tun much easier.

I'm looking for a material that I can attach permanently that also looks pretty cool. Think this may tick all the boxes.

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Old 03-15-2010, 08:40 PM   #4
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Doesn't it say max surface temp is 60C? Isn't that well below what you will heat to?

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Old 03-15-2010, 08:58 PM   #5
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It does say max surface temp 60C but it also says it self-extinguishes so I thought it would be alright. Now I'm not so sure...

I thought armaflex was the material people used when insulating a direct fire mash tun?

Are there better materials to use for this purpose?

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Old 03-15-2010, 09:41 PM   #6
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Any flame roll-out from the burner will melt the armaflex and probally make some nasty fumes. Unless you can protect the lower edges I wouldn't put armaflex near an open flame. Zero flame spread doesn't mean fire proof. Unless you've got a ceramic insulation or something along those lines any flame contact is going to cause insulation degredation and some sort of melt/smoke.

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Old 03-15-2010, 09:45 PM   #7
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See my thread on direct fire : http://www.homebrewtalk.com/f51/direct-fire-mlt-insulation-project-154652/

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Old 03-16-2010, 06:29 PM   #8
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Your mash tun looks cool. I don't have the tools to be cutting aluminium sheet unfortunately I was hoping to find some kind of material that required minimal tools to attach and that was flame resistant and waterproof. Looks like I'll have to rethink the armaflex...

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Old 03-17-2010, 01:59 PM   #9
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from the link:

Quote:
For temperatures above +60°C, please consult our Technical Department.
Maybe you should make a phone call
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Old 03-17-2010, 02:11 PM   #10
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There are other products on their website that state the max temp is 105C. I think they do several versions of the product that can withstand different ranges of temperature.

I sent an email to them last night but haven't received a reply yet. I ask them something along the lines of "what would happen if I placed armaflex approximately three inches away from a naked flame? Will it burn?" I hope I didn't sound like too much of a nutter...!

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