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Fiberglass Insulation???

post #1 of 6
Thread Starter 

I have exhausted my internet research skills and have to ask you fine folks..

What is your take on fiberglass insulation? I found 3 examples of use in "hot" smokers, but really no hard facts or concerns. Lowe's sells a non faced, formaldehyde free, R30 insulation and everything I've read from the manufacturer and fire/heat rating sites is that something like this could handle up to 850 deg. but I still concerned about toxins and breakdown.


My build is a upright freezer and the inside metal panels are a fairly heavy stainless, I don't believe the temps would exceed 350- 400 max. I'm going with a propane burner and don't see how this could really cause a problem. I wanted to run this past you folks for your opinion and/or maybe something I might be missing. Thanks fer yer help, BK

post #2 of 6

Here are a few resources hope this helps. Good option for insulation in between "double wall" steel.

post #3 of 6

BigK, personnelly I would rather not pick glass out of my food,thus a non-covered thermal insulating material is not a good option(IMHO)icon_frown.gif

I would say,if you want an insulator for those windy and cold days,invest in a Welder's blanketicon_idea.gif.

And I suppose you are going to wrap only the cooking chambericon_exclaim.gif I wouldn't wrap the firebox as it

will be OK with just a windblock.icon_mrgreen.gif

I'm going on the fact that you have a firebox.If you have a belly burner or other type of smoker,the welder blanket is good.


Opps, read the post again,but even though you may be covr-erring the insulation.I would get an encapsulated version.(IMHO)

Hope this helps and remember,


post #4 of 6



Not wanting to throw you a curve, but fiberglass insulation, which is rated in R value, is usually for home construction, it will work, but there are better solutions. 


You might want to look into refractory insulation, it's rated in K value, it usually comes in rigid sheets, if you search for BBQ Engineer, he has a very detailed thread on the insulated smoker he built, ...if you decide to use it you should be able to find some at a Plumbing and Heating supply for contractors.



post #5 of 6
Thread Starter 

Hey, thank you guys for the info. I really don't want to go fiberglass, but price is I'm gonna wait and look fer something a little better...Thanks again!             BK 

post #6 of 6

This is my 3405BGW GOSM insulated on three sides.  Behind the sheet metal edging is loose fiberglass insulation.  I have operated this at 400+ degrees with no problems.  The insulation significantly improves temperature in winter and on windy days.  I also have a concrete "heat sink" added to the bottom shelf that makes a huge difference in getting the temperature back up after opening the door.  Empty, I can reach 225 degrees within 6 minutes, 350 degrees in 10 minutes.  With the needle valve, I can get the temperature to just about anywhere I want from 140 to 400+ and keep it fairly close to the desired temperature.  All of the hardware can be had at any hardware store - my next improvement is a gasket on the door.


As to using fiberglass insulation - the melt point is well beyond any smokers operating temperature.  Although there are higher r-value materials, fiberglass is super cheap and just needs 4"-6" of insulating space.


In all, the cost for the entire cart was ~$75 and a couple of weekends building it - well wirht the investment.


I also have a box to put on top of tank with a 200 watt mini-heater that keeps the regulator warm in cold weather (water in the tank freezes and restricts the flow of propane).



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