Old 09-24-2009, 07:41 PM
Join Date: Sep 2009
Location: Malaysia
Posts: 7
Default Re: Vermiculite/ cement- set?

i need some info on heat bond refractory mortar. does it mix with portland cement and set well for building a pompeii oven? i use air bond mortar now but i was told it will crack easily. please advise.
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Old 09-24-2009, 07:59 PM
Join Date: May 2009
Location: Austin, Texas
Posts: 102
Default Re: Vermiculite/ cement- set?

To answer two posts in one shot Neil2 is right, wait about a week. Even though everything my eyes told me the perlite and portland mixture was wrong after a week is was hard enough to stand on whilst I laid the bricks. Yes the edges to flak off at the corners but once I put brick around the base and skimmed mortar atop the perlite it was all fine. And Neil@ is right about grain size, I bought the detergent looking stuff and ended up giving it away. Here in Austin I went to a Hydroponics store and got the coarseness that I really needed at a good price. With shipping charges alot of the mail order stuff is, how do they say it? Too dear.
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