FB Brand Insulation Getting Started Discuss FB Brand Insulation in the Pizza Oven Design and Installation forums; Thanks so much for the replies. Mfiore, I think using a DRY mixture of sand/fireclay is the ticket...just like laying ...

[splatgirl]

Thanks so much for the replies.
Mfiore, I think using a DRY mixture of sand/fireclay is the ticket...just like laying patio pavers. Duh. I wish I had thought of/tried that before I wet down a whole bucketfull and tried to trowel it on.
Anyway, I ended up doing as I proposed above which worked pretty good. As you pointed out, James, the particle size of vermiculite is fairly large, and actually, I used perlite which was worse, but it worked great with a little dry sand/fireclay mixture dressing. Success on attempt #1 today! Cooking floor is in and my soldier course is set and ready to be mortared.

I put a tape measure on the boards I'm using before I started the do over just to make sure I wasn't being overly fussy. There was 1/2"+ variation in thickness from one piece to another measured at the exposed edges, plus I'd say I had another +1/4" high spot on one board and close to -1/4 low on another.

Again, I appreciate the comments and advice.

cheers
s.g.

[blacknoir]

James, would you recommend a sand/fireclay mix or a refractory mortar layer between the FB board and the firebrick? If sand/fireclay, what ratio would you recommend?

I just ordered my boards today from FB btw.. can't wait to get started laying brick!

-Shay

[james]

I think dry and mortarless is fine when you are setting discrete bricks. Try 50/50. That should be good!
James