Available in a one-gallon or 50-lb. pail, this fireplace mortar offers all the features and uses of Heat Stop pre-mixed. Beige color only. Water soluble. 

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Domestic Fireplace Mortar is a premixed and ready to use regular mortar. It was developed for installation of firebrick in masonry fireplace installations. It also has many other uses such as in chimneys, boilers, incinerators, furnaces, kilns, etc.

TIP when using Domestic Fireplace Mortar.  For best results:

  1. Mix all of the contents in the container thoroughly before using.
  2. If, after mixing, the product still appears dry, add a little clean water and remix thoroughly.
  3. For firebrick installation, keep the joints 1/16" to 1/8" thick.

This product may take longer to dry if the joints are thicker than 1/8", and/or if conditions are extremely humid (such as after a recent rain). To enhance drying in such conditions, open the damper, place a fan in front of the firebox, build a fire in it, or use others means to get some air or heat passing by the installation. 

» Safety Data Sheet (.pdf)