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Old 07-08-2010, 09:45 PM   #1
Join Date: Jul 2010
Location: Down Under/ Tasmania
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fire resistant mortar

We are building a pizza oven in our kitchen, wondering if anyone has advice on mortar so that it will not crack, is it better to locate a refractory mortar supplier or make up a mixture using fire clay, sand and cement? Has anyone heard of a product called pearlite being used in the firebox?

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Old 07-08-2010, 10:33 PM   #2
Concrete & Masonry
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Location: Wisconsin
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fire resistant mortar

For interior use, this is what I prefer:


As for the "perlite", look for an insulsting castable for what you need. Perlite can be mixed in with Portland to do the same, but I'd still recommend a re-mix if you're on alearning curve.

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Old 07-08-2010, 11:12 PM   #3
Join Date: Jul 2010
Location: Down Under/ Tasmania
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fire resistant mortar

Thanks for getting back to us, We will locate the refractory mortar. We have already used a mortar mix that resulted in some cracking, should we go over the cracked surface or remove existing layer and do it again? We also have a steel door in the firebox section, will the refractory mortar be able to expand as the metal heats and expands? We would like to avoid cracking in the mortar render around the door area. Is refractory mortar what we should be using on the inside of the firebox over the sand and firebrick base, or do we need to use something else with the direct flame/ heat?
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