Does anyone know the ratio of stainless steel fibers to cement? In the instructions it calls for one bag of fibers to 3 bags of refractory cement but it does not specify the size/weight of either bag. Also the materials list doesn’t list the fibers. I’m researching the 40" Mattone Cupola
The mix is 1 pound stainless steel fiber to 50 pounds castable refractory. The fibers are supplied in a one pound bag, so it’s basically one bag to one bag.
Here is the full guide on mixing. You’ll find the ratio listed there.
[As I read your question it sounds like these may be contradictory instructions, so there may be further guidance coming along!]
When you look at that FAQ, the photo shows the refractory being held by a bare hand. Brickwood has said in the past that the photo is for illustrative purposes, and refractory should be handled with gloved hands only (whether or not the stainless steel fibers have been added—they would only make it worse!).
Hope this helps!