[TheForge] Kaowool vs Soft Fire Brick

[Daniel Kretchmar]

I have questions for the hivemind:

I wish to build a new forced air forge.  My current plan is (starting from
the outside)
1. A shell from a 40 lb propane tank
2. A layer of fitted soft brick with high temp mortar or a layer of kaowool
3. satanite
4. Itc-100

Questions: Will softbrick insulate as well as kaowool?  Will soft brick be
more durable when using borax for flux or will it melt just as easily?

Suggestions are appreciated.

Danr
www.,irontreeworks.com