This convenient pre-mixed, ready-to-use product is available in one-gallon or 50-lb. pails. This product works well in firebrick installations such as fireplaces, boilers, furnaces and kilns. Gray color. Also available in beige color. Water soluble. 

Related Product



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

TIP when using Heat Stop Premixed.  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 it 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 thciker than 1/8", and/or if conditions are extremely humid (such as after a recent rain).  To enhance the drying in such conditions, open the damper, place a fan in front of it, or use other means to get some air or heat passing by the installation.  

» Safety Data Sheet (.pdf)