I came back from the brickyard with castable refractory cement to mortar my firebricks. It didn't look right - had aggregate in it. So I called the manufacturer and learned what I feared - no good for mortar joints.
After some conversation where they assured me the 50 pound buckets of pre-mixedrefractory mortar I had been using really weren't right for the job either. Refractory mortar shrinks, they explained.
Instead they suggested something they're selling as flue mortar - ALSEY Flue-Set Non-Water Soluble Refractory Mortar to be specific. They said it is harder to work with, but is good for filling larger voids, like untapered arch bricks, plus its OK exposed to the weather after 24 hours.
I'll buy a 50 pound bag (over $100!) but wondered if others have had experience with it?
After some conversation where they assured me the 50 pound buckets of pre-mixedrefractory mortar I had been using really weren't right for the job either. Refractory mortar shrinks, they explained.
Instead they suggested something they're selling as flue mortar - ALSEY Flue-Set Non-Water Soluble Refractory Mortar to be specific. They said it is harder to work with, but is good for filling larger voids, like untapered arch bricks, plus its OK exposed to the weather after 24 hours.
I'll buy a 50 pound bag (over $100!) but wondered if others have had experience with it?
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