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America's #1 Brand of DIY Outdoor Pizza Ovens!

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High-Temperature Refractory Mortar - Dry / Bag


Product Description

High Temperature Refractory Mortar



The product of choice for outdoor wood fired brick pizza ovens, masonry bread ovens, fireplace and chimney installations (interior or exterior) or where moisture may be present in masonry chimney installation.  These dry-mix refractory mortars are made from high temperature cements and carefully selected aggregates that will not expand or tear the mortar apart when heated. Once dried, these products are non-water soluble and more acid resistant than any other type of product used in these applications.

  • When building an outdoor wood fired pizza oven, THIS IS THE MORTAR TO USE as it is NON-WATER SOLUBLE.
  • Replaces our 4-Ingredient High-Temp mortar blend (Silica Sand, Fireclay, Portland Cement and Lime)
  • Add clean water (approximately 3/4 to 1 quart) for each 10 lbs. and mix thoroughly. No other additives required.
  • Cold water works best. Warm water quickens set time. Do not remix or retemper this product as you would with a regular mortar.
  • HeatStop 50 (50lb bag) yields approximately 60 lbs. of refractory mortar. This is the most economical per pound.
  • Meets and exceeds ASTM C-199, ASTM C-1283, ASTM E-136.
  • Color with masonry mortar color if desired. Follow color manufacturer’s instructions as if using a regular masonry mortar.
  • Good for applications well over 2,000°F.


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