BuddingCo.com

HEAT STOP II & HEAT STOP 50

These dry-mix refractory mortars are made from high temperature cements and carefully selected aggregates that will not expand or tear the mortar apart when heated. Once dried, these products are non-water soluble and more acid resistant than any other type of product used in these applications.

• 1. Q. How long should we wait after installation before heat may be applied to fireplace or chimney?
  
• A. With regard to firebrick, clay flue lining
• or any of the Heat Stop refractory mortar products simply wait one day
• after all of the masonry in the fireplace or chimney has been installed.
• 
  
  
• 2. Q. What are the Heat Stop product types?
  
• A. There are only two as follows:
  
• 1. Heat Stop in a 1 gallon (15 lb.) pail or a 3 gallon (50 lb.) pail. Premixed and ready to use.
  
• 2. Heat Stop-II in a 1 gallon (10 lb.) pail and Heat
• Stop-50 in a 50 lb. bag. Same producte but different size container.
• Add water, mix and ready to use.
• 
  
  
• 3. Q. Which of the Heat Stop products is the least expensive
  
• A. Heat Stop-50, the dry mix in the 50 lb. bag is least expensive. A 50lb. bag when mixed with water yields approximately 60 lbs.
• 
  
  
• 4. Q. Which of your products is the best for installation of clay flue lining and why?
  
• A. Heat Stop II or Heat Stop-50 are the best
• for installing clay flue lining because they are completely non water
• soluble in service after the initial set. This type of product is
• specified by the NFPA-211 (National Fire Protection Association).
• 
  
  
• 5. Q. What A.S.T.M. (American Society for Testing
• Materials) specifications are called out by local and national building
• codes regarding fireplace and chimney construction?
  
• A. For refractory mortar ASTM C-199 (medium
• duty). All Heat Stop products meet or exceed this requirement. Firebrick
• ASTM C-27. Clay Flue Lining ASTM C-315. Clay Flue Lining Installation
• ASTM C-1283.
• ASTM C-105 is a discontinued specification for
• fireclay and should not be used. Fireclay mixes with regular mortar do
• not meet current building codes.
• 
  
  
• 6. Q. Where are Heat Stop refractory products available?
  
• A. The the Budding Company Retail stores - or Online at www.BuddingCo.com
• 
  
  
• 7. Q. Which of your Heat Stop products may be colored and how?
  
• A. Heat Stop-II or Heat-50 will work with
• mortar color just like any regular masonry mortar. Follow the mortar
• color manufacturers instructions as if Heat Stop-II or Heat Stop-50 was a
• regular mortar.
• 
  
  
• 8. Q. How thick should the Heat Stop refractory mortar products joint thickness be?
  
• A. Joint thickness is recommended at --1/16"
• to 1/8" thick. If a thicker joint is required (up to 3/8" thick) we
• recommend the use of the dry mix Heat Stop-II or Heat Stop-50.
• 
  
  
• 9. Q. Which of the Heat Stop refractory mortar products is most popular?
  
• A. Every year Heat Stop-50 is used more than any of the other products. The reasons why follow:
  
• 1. Heat Stop-50 is the least expensive.
  
• 2. Heat Stop-50 (or Heat Stop-II) may be used for
• firebrick or clay flue installations with up to 3/8" thick joints.
  
• 3. Heat Stop-50 (or Heat Stop-II) may be easily colored with mortar color.
  
• 4. Heat Stop-50 (or Heat Stop-II) is non water soluble in service.
  
• 5. Heat Stop-50 (or Heat Stop-II) has an indefinite shelf life.
  
• 6. Heat Stop-50 (or Heat Stop-II) has excellent drying characteristics no matter the humidity.
• 
  
  
• 10) I’ve noticed that the refractory mortar I’m
• currently using in firebrick or clay installations is not drying as it
• should. Should I dig out the soft mortar and replace it? What will
• help the situation?
  
• A. You do not have to dig out and replace
• the soft mortar. It will dry. This condition most often occurs when
• one of the following occurs:
• - The refractory mortar is the premixed type. (All
• brands of premixed refractory mortar dry about the same as they all use
• the same type of drying or binder systems.)
  
• - The joint thickness is 1/8” thick or greater
  
• - The ambient weather conditions are damp, such as
• in a damp basement, in rainy conditions above ground, or where there has
• been too little air circulation.
  
• To improve the situation, increase the amount of air
• circulation over the installation by opening the fireplace damper as
• soon as the installation is complete (and keep it open); open an
• adjacent window or door; place a room heater or fan in front of the
• installation; or build a small fire even before it has dried out.
• 
  
  
• To avoid this problem in the future, use
• Heatstop-50. Among its advantages, Heatstop-50 is a hydraulic setting
• and will not be severely affected by humidity.