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3. Fireplace Opening and Hearth Extension
Flush with the Floor
Non-combustible flooring a minimum of 20 in. (508
mm) in front of and 12 in. (305 mm) to each side of the
fireplace opening is required.
The hearth framing must be constructed of non-com-
bustible materials (such as metal framing or equivalent
material) and placed on HX3(s), HX4(s), or equivalent
material.
When creating the platform, allow for the thickness
of the non-combustible finishing materials.
Seal gaps between the hearth extension and the front
of the fireplace with a bead of non-combustible sealant
or grout.
Motor, grout or 300° sealant
Note: The bottom of the
fireplace opening is 8 in.
(206 mm) above the bottom
of the fireplace. Finished
hearth must NOT extend
above this level.
Finished
20 in. Min.
Floor
Hearth Extension
Micore
Noncombustible Material
Figure 7.9
Flush Hearth Extension Side View
Majestic Sovereign Series • SA36R/SA42R • Installers Manual • 4010-259 • Rev K • 1/22
Protective Metal
Hearth Strip
C. Non-Combustible Sealant Material
After completing the installation of non-combustible
material in the required non-combustible zone and the
non-combustible finishing material over that, a bead of
non-combustible sealant must be used to close off any
gaps at the top and sides between the fireplace and
hearth.
Non-combustible Sealant
Figure 7.10 Place Non-combustible Sealant
WARNING! Risk of Fire!
Hearth & Home Technologies is not responsible for
discoloration, cracking or other material failures of
finishing materials due to heat exposure or smoke.
• Choose finishing materials carefully.
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