sakrete 50 lb gray type high heat mortar mix at lowe s sakrete high heat mortar is a dry medium duty mortar ideal for setting masonry units in rutland dry mix 211 is a refractory mortar ideal for joining or repairing masonry flue tile in any gas or wood fireplace and wood coal or pellet repair your oven pizza bread bee hive dutch fireplace furnace chimney kiln boiler fix your incinerator wood stove fire pit or any this patch is a dry mix cement that cures chemically when mixed with water exceptional strength and heat resistance make this perfect for repairing 720611 domestic fireplace mortar 15lb this refractory cement by rutland can be used to set coat or repair firebrick that has been damaged it is an extremely effective sealant for