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 any building code,
anywhere.
6. Q. Where are Heat Stop refractory products
available?
A. Wherever firebrick and clay flue lining are sold.
Try your favorite masonry supply yard and or concrete
block manufacturer.
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. Q. How long have the Heat Stop refractory mortar
products been in service?
A. Since the 1970's in several hundred
thousand residences all over the world.
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