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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
The screws should be driven through the cement board into the outer
metal skin of the fireplace. The sheetrock (drywall) is then butted up
to the cement board. The sheetrock above the fireplace should also be
fastened to the fireplace by driving screws into the outer metal skin of
the fireplace.
Facing Less Than 1” Thick: If the combined thickness of the facing
material (eg. 3/8” [9.5 mm] thick ceramic tile and 1/2” (13 mm) thick
cement board) is less than 1” (25 mm), then the tile can be placed behind
the fireplace (see below).
Facing Installation Considerations
Non-combustible cement board (such as Wonderboard, Durock, or Har-
dybacker) must extend 10” (254 mm) above the 1” (25mm) top reveal
and a minimum of 5” (127 mm) from each side reveal (see drawing
below - right). This cement board may be 1/4” (6.3 mm) thick or greater,
but would normally be the thickness of the drywall - for example 1/2” (13
mm). The cement board may be fastened with drywall screws.
Cement Board - minimum
of 5” (127 mm) wide
10” (254mm)
Minimum
Sheetrock
Sheetrock
Figure 9
5” (127mm)
Minimum
Cement Board
(25mm)
1” Reveal
3/8” (9.5 mm) Tile and 1/2” (12.7 mm) Cement
Board Behind Fireplace Face