Fire Clay

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Fire Clay

Fireplace Supplies

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. 



  • HEAT STOP-II is provided in a 10 lb. pail as well as 50 lb. bags. 

  • For estimating purposes approximately 50 lbs. will lay up 100 firebricks (2 ½ inch thick) if joint thickness is 1/16 to 1/8 inch as recommended.

  • Joint thickness up to 1/2 inch is acceptable with this product and is quite common.

  • 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.