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Heat Stop 50 Refractory Mortar Size:50 lb bag r-n6v787{font-size:13pxHeat Stop 50 is the ideal high temperature refractory mortar solution. This product is great for clay flue linings, firebricks, masonry ovens, interior and exterior chimneys, and fireplace applications. This 50 pound bag of dry refractory is mixed with water to create 60 lbs of mortar. It will lay up to 100x 2 1 2" thick bricks with joints of 1 16 to 1 8" thick and can accommodate joints up to 1 2" thick. Good for mortared joints up to 1 2" thick This