Alright, thanks. Just need to double check math quick for how much i'd actually need.
Assuming 90lb per cubic foot, which i believe that kastolite 30 is, my math is as follows:
Arch
6" radius
- wool = 4"
0.5" of refractory
3.5" tall
301.44 Total Volume
230.79 Inner Volume
70.65 Difference
Walls x2
12"L x 4"H
48 Total
Floor
12" x 12" x 3"
- wool = 12"x12"x1"
144 Total
274.65 cu IN total
350 cuIN 30% safety
Which would mean I would need about 20lb of refractory if my math is correct.
Attached is a rough drawing of the forge. Black is kaowool, gray is refractory, yellow is my burner