Amount of fireclay for a 42" oven

[Myckls]

Does anyone have a rough idea of how much fireclay they used in their homebrew to build a 42" oven?

[mongota]

I bought one 50lb bag. Did not use the whole bag.
The sides of my brick were tapered so my mortar joints were somewhat tight, meaning less mortar required.

[Myckls]

Thanks. The closest clay I've found is a 2 hour drive away so I want to make sure I get enough.

[UtahBeehiver]

I used a bag and a half (50#) on a 42". It is relatively cheap so with a two hour drive I would add contingency.

[CoastalPizza]

I used about 3/4th of a 50 lb. bag in my 32" cast oven. Is yours going to be cast or brick?

[Myckls]

It's going to be brick. The fire clay is sold in 10, 50 or 200lbs so it sound like a 50 and a couple spare 10's should be enough.

[Gulf]

Dry powdered fire clay or wet sculpting clay? The 10 and 200 lb. weights sound a little “off” to me.

[Myckls]

When I called the pottery place, I only asked if they sold fire clay and what the price was. I'll have to call them back when they're open to get some additional details.

[david s]

Be careful because to a potter fire clay is a different product to that of a mason. For masonry fire clay is the cheapest clay available to make mortar more workable. To s potter fire clay is a clay that will withstand extremely high temperatures (1260+ C) Do not get clay in a plastic state, it must be powdered. Probably better to ask the potter for Ball Clay.

[Myckls]

I called back about the clay. It's "Lincoln fire clay" in powdered form. I must have misunderstood the sizing when I originally called, 10lbs is the minimum, 50lbs is cheaper per lb and anything over 200lbs is a bigger discount. I've tried a few different brick yards/masonry suppliers and can't find clay. Does this sound like the fire clay that will work in the homebrew?

[UtahBeehiver]

IMHO is what you need, it should be Lincoln 60, it is similar to ball clay, adds plasticity with min shrinkage.