Out side the box oven build

[bagley2000]

This is a modgular oven that i am building. It can be a 2' x 2' , 4' x 4' , 6' x 6' , 4' x 8' or a 2' x 8' box. We are building it in 2' x 2' wall sections that can be stacked and pined together. To insulate the walls we have a 1/4" stand off of screen and wire mesh and filling the walls with vermiculite. Will be sheeting with 24 gauge galv steal inside and out. Please if you have any advice or conserns about this build please let me know for this is my first oven build and all the help would be nice.[IMG][IMG][/IMG][/IMG]

[bagley2000]

http://s851.photobucket.com/albums/a...a.jpg&newest=1[IMG]
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[bagley2000]

Just trying to add attachments to the post above.
This is one of the 2' x 2' pannels under construction.

[BigJayDee]

couple of questions what is the temp rating of your insulation (I am not familiar with what you have) ?

How large of a wall stud are you using ?

I am not sure that 24 guage is going to be thick enough for the inside, I am willing to bet that the outside of your oven is going to be extremely hot !

[bagley2000]

Thermal Insulation--Vermiculite has been used for over 50 years for insulation in attics, walls, and high temperature industrial applications. In recent testing, vermiculite masonry insulation used in a standard 8" lightweight block performed better than urea formaldehyde foam polystyrene beads, and polystyrene inserts. Generally vermiculite will increase the total insulating value of a block wall by 35% to 60% depending upon the properties of the concrete block.

Permanency--Vermiculite is a naturally occurring mineral and has a sintering point of 2300o or (1260o C). Once in place, this product has very minimal settling properties. Vermiculite is free flowing and will fill and insulate all voids.

Non-Combustible--In testing following the ASTM E-84 tunnel test, vermiculite has no flame spread, no fuel contributed, or smoke developed

Got this info from here SCHUNDLER COMPANY--Vermiculite Masonry Fill--Loose Fill Insulation

Can get 4 cu ft bag for 14.00 a bag

[bagley2000]

This is the back wall

[bikerdad46]

Thermal Insulation--Vermiculite has been used for over 50 years for insulation in attics, walls, and high temperature industrial applications. In recent testing, vermiculite masonry insulation used in a standard 8" lightweight block performed better than urea formaldehyde foam polystyrene beads, and polystyrene inserts. Generally vermiculite will increase the total insulating value of a block wall by 35% to 60% depending upon the properties of the concrete block.

Permanency--Vermiculite is a naturally occurring mineral and has a sintering point of 2300o or (1260o C). Once in place, this product has very minimal settling properties. Vermiculite is free flowing and will fill and insulate all voids.

Non-Combustible--In testing following the ASTM E-84 tunnel test, vermiculite has no flame spread, no fuel contributed, or smoke developed

Got this info from here SCHUNDLER COMPANY--Vermiculite Masonry Fill--Loose Fill Insulation

Can get 4 cu ft bag for 14.00 a bag

Hello bagley2000
What is the R value of the insulation at 2 3/8" ? Also If I was building it I would use 3 5/8" 20 ga steel studs. It would give you more room for the Vermiculite. I don't think the vermiculite has enought R value
for the oven. I know years ago it was used in block walls but the inside of the buildings were furred out and insulated with fiberglass or foam insulation. Just check the R value and make sure it's at least 13 at 2 3/8".
bikerdad46

[bagley2000]

Thank you bikerdad46 i checked the R value and it will not work at 2 3/8" it gives you abuot an R 6. I still like the idea of using Vermiculite just for the fact it is a loose fill and will fill all the voids in the walls. I think the new plan will be to double my wall thickness that would rase the R value to 12.

Thank you for the help
bagley2000

[baz]

Thank you bikerdad46 i checked the R value and it will not work at 2 3/8" it gives you abuot an R 6. I still like the idea of using Vermiculite just for the fact it is a loose fill and will fill all the voids in the walls. I think the new plan will be to double my wall thickness that would rase the R value to 12.

Thank you for the help
bagley2000

i m not sure why you want to use vermiculite , the r value is very low and the fact that it will fill all the voids in the walls is not very important because if you are building simple 2x2 sections it is very easy to fill them completly by using some rockwool or mineral wool insulation .
when lining the walls , will you be lining the whole wall in 1 piece or are you thinking of lining every 2x2 sections separate

[bagley2000]

Yes i will be insulating every 2 x 2 x 4 3/4 section separate. The plan is to build several of these 2 x 2 sections and build any size oven we need. The vermiculite is just what we found in town for 11.00 dollers a bag.