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domenico 01-30-2009 01:25 PM

Refmix vs. HeatStop
I'm at the point of needing to mortar my dome bricks, is there a reasonably good alternative to Refmix? Both the fireclay and HeatStop refractory mortar seem to be more cost effective, but not sure itís the best method.

Jed 01-30-2009 05:06 PM

Re: Refmix vs. HeatStop
Hi Domenico,

Many of us have used the 'home brew' high heat mortar mix as detailed in the Pompeii plans successfully. Fire clay with sand, Portland cement and lime if my memory serves.

I am sure the commercial products are "better". I'm not sure how they are better. In most cases, good enough is good enough. Particularly for a home oven application, the home brew is good enough.


david s 01-30-2009 05:17 PM

Re: Refmix vs. HeatStop
The commercial products tend not to contain sand because at high temps 1100 C+ the sand can tend to flux and melt. This is not a problem at the temps we fire to so sand should be ok. They also don't contain portland cement because it doesn't like heat either. They contain Calcium aluminate cement which is very expensive. I think the home brew should be ok, maybe our kids or grandkids will find out when it fails.

dmun 01-31-2009 08:36 AM

Re: Refmix vs. HeatStop

Both the fireclay and HeatStop refractory mortar seem to be more cost effective
The dry Heat stop is what I used, it works beautifully, but it is expensive. If you can get it at your local mason supply, it saves the shipping on the Refmix.

Builders have used the homebrew formula successfully, and Frances used the plain fireclay-sand mixture, which may be cheapest of all, and seems to be successful.

domenico 01-31-2009 07:32 PM

Re: Refmix vs. HeatStop

Thank you so much for your help. I found a local place that has the dry HeatStop, but you're correct it's not cheap.

I love this forum as everyone is so helpful. I'll be posting some pics soon.


Ken524 02-04-2009 09:32 PM

Re: Refmix vs. HeatStop

I notice you are in CA. Call Forno Bravo and double check the shipping cost of RefMix. Since you are fairly close, it might be feasible to go with the FB stuff.

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