Description Heat Stop® Refractory Mortar is an easy to use, economical brand of mortar that can be effectively used in the installation of firebrick and clay flues, as well as in repair or restoration work. · HEAT STOP-50 is provided in a 50 lb. bag. 48 Bags per pallet. · 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.
