[dpmphoto]

I've gotten alot of good info from all you guys so its time to return the favor.I found a new material to use for the inside walls of the oven its called hardi backer board, available at home depot.This material is a new answer to concrete board used to apply shower walls floors et.Its a tan material which comes in 5by3 foot sheets in quarter and half inch thickness.its good up to something like a 1000 degrees or more, it cuts easily and is not messy (crumbly like the concrete board).It also holds heaty very well and takes fireplace caulk fb13 very well.The best part is that its only 9 bucks a sheet much less than sheet metal.Oh yeh almost forgot its much lighter than concrete board and you can you use it on the outside as well instead of costly sheet metal. Cheers