Looking for help on smoker build

[hephaestus]

I know I'm most likely out of a lot of peoples element on this question. But all it takes is one person to help me. So my build has its firebox that I need to insulate on the outside of it. The reason that I need it is because its going to be down near my legs. So does anyone know if I use fire bricks will they be cooler on the opposite side of the firebox. The bricks are going to be strapped on and removeable. please take a look at the attachment

Thanks in advance
Brian(broken image removed)

 

[Jags]

As a smoker dude myself, I would need more info. First, are you talking cold smoke, hot smoke or BBQ? Eventually, the bricks will come up to darn near the same temp as the skin of the "hot box". Consider a false front with air gap.

 

[lukem]

Consider insulating the firebox with some mineral wool?

 

[Delta-T]

vermiculite aint a bad idea either if you have a way to contain it.

 

[hephaestus]

First off thanks for the posts guys. And to answer your question Jags its going to be a hot/bbq smoker. The cold smoker is down the road after this build. If any of you are interested here is a link to my build http://www.smokingmeatforums.com/t/143986/center-firebox-build ( I'm sorry in advance if I'm not allowed to to that) I talked to a fire Inspector today and he said to put an air gap in between what ever insulation I use.s I agree with the air gap. I looked into both your suggestions on wiki and found that they are both in what I'm looking for. So Lukem where is a good to get mineral wool at and is it expensive? And to Delta-T it mentioned to mix with portland cement is that necessary. Or do I use it by its self.
So those two mediums are good solutions and think I'll make a box of 1 or 2 inch flat plate steel then sandwich it in between 1/8 th plate steel. So it"ll by 2 or 3 inches thick

Thanks again for you help

 

[lukem]

So Lukem where is a good to get mineral wool at and is it expensive?

Sorry, but I don't think I can answer that as I've never bought any. There are plenty of people on this site who have though. If you posed that question over in the hearth room forum you'd probably get your answer, quick.

 

[Adios Pantalones]

Roxul brand "rockwool" is sold as accoustic fire batts. Good insulation, good temp resistance, but bad physical properties (falls apart easily), so you'd want protection on both sides.

edit- roxul is cheap. Kaowool would still need protection- easier to handle, much more expensive. Insulating firebrick, or insulating castable (can make your own) should not be the floor of the firebox, but is much more durable. M-board, kaowool board, etc will need protection, but is easy to build with (expensive)

 

[BrotherBart]

Lowe's sells Roxul mineral wool insulation now. Several sizes.

http://www.lowes.com/pd_305816-1278-RXSS31525_?PL=1&productId=3394032

 

[basod]

If you're going to spend money on firebrick(they aren't cheap) you'll want to line the inside of the firebox with them.
Is the firebox going to be suspended under the tank/chamber? I'm guessing there is additional legs/supports to hold the tank up
The idea of building a box within a box and sounds like the best idea, you can stick the roxul to the steel with a can of spray elmers glue and then sandwich it.
If you were to fab both boxes with a bottom and then you can just pour vermiculite in the void prior to welding it to the bottom of the tank