Instruction
21
the Chase Top Flashing to the chase using a
sufcient number of #8, 1-1/2” wood screws,
ensure the air gap is maintained between the
ashing and the chase. Seal the screw heads
with non-hardening sealant. When installing the
Storm Collar, allow a 1” air space between the
bottom of the Storm Collar and the Chase Top
Flashing. Note: Non-combustible insulation is not
approved for use at the Chase Top.
METHOD 4: MASONRY FIREPLACE
INSTALLATIONS
1. Determine Chimney Size: Use Fig.30 to
determine the correct diameter chimney for your
replace.
2. Mount Anchor Plate: Chimneys for masonry
replaces begin with an Anchor Plate. Make
sure the surface of the masonry chimney has
a level surface on which to attach the Anchor
Plate. If the top of the masonry does not have
a level surface, then you will need to modify the
masonry accordingly. Follow the requirements
of your local building department for connecting
factory-built chimneys to masonry reboxes or
masonry chimneys. Center the Anchor Plate
over the masonry ue opening, and seal the
Anchor Plate with a high-temperature (1000ºF)
sealant. Secure Anchor Plate with at least (4)
1/4” x 4” masonry anchors (Fig.31). It is very
important that the Anchor Plate is level. Be sure
to maintain a 1” min. clearance to combustibles
from the Anchor Plate.
3. Attach Chimney: Twist lock the rst Chimney
Section clockwise onto the Anchor Plate.
4. Finish Chimney: Install the rest of the
chimney as directed in the Ceiling Supported
Installation section, Steps 4 through 10
Refer to Fig.1, Fig.30 for chimney height
requirements. Always maintain at least 2” of
clearance to combustible materials, and enclose
the chimney where it passes through occupied
areas. Use a Wall Strap for every 8’ of chimney
Figure 30
T
W
H
and 30” high, and the chimney height as 20’.
12” diameter pipe.
Dotted line represents sample problem.
CHIMNEY SIZING CHART
FOR FIREPLACE INSTALLATIONS
T
W
H
T
H
8
7
6
30
16
14
20
8
10
15
12
10
50
40
30
24
48
60
36
42
72
HEIGHT
36
30
42
24
48
18
WIDTH
18
20
22
24
20
18
60
72
84
84
HEIGHT
(FEET)
CHIMNEY
FIREPLACE
OPENING (INCHES)
CHIMNEY
PIPE
DIAMETER
(INCHES)