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Non-combustible Sealant
After completing the framing and applying the facing mate-
rials over the framing, a bead of non-combustible sealant
must be used to close off any gaps at the top and sides
between the fi replace and hearth.
Non-combustible Sealant
Noncombustible Material
Protective Metal
Hearth Strip
30 in. Min.
Hearth Extension
1 in. (25.4 mm)
Micore
Finished
Floor
Note: Maximum height from floor under
fireplace to top of finished hearth extension
is 3-3/4 in. (95.3 mm)
Bottom of
Fireplace Opening
Figure 12.7 Flush Hearth Extension
Flush Hearth Extension Framing
Refer to Figures 12.7 and 12.8.
Figure 12.8 Flush Hearth Extension Side View
Figure 12.6 Place Non-combustible Sealant
Heat & Glo • RUTHERFORD-50 • 4059-333 Rev C • 06/08