Hearth and Home Technologies BIR50-B - Manual (Page 29)

29
1/2"
Chase top
flashing
Roof
radiation
shields
Required
spacing
clips
Spacing Clips
1/2 in. air space
established by
spacing clips
1/2 in. Air Space
Storm collar must
be installed 1 in.
off chase top
1 1/2 in. ventilation
opening around
chimney pipe
Figure 8.13
Figure 8.14
Chase Top
Collar
Sealant
Additional
Structural Support
Screw or
Pop-rivet
Insect
Screen
Roof Radiation Shields
placed here
Screws
to hold
flashing to
chase top
Figure 8.15
1 1/2 in. ventilation
opening around
chimney pipe
Chase Top Collar
Turn-down
Slope downward
Drip edge
Insect-guard screening
may be added between
chase and chase top
flashing.
Figure 8.16
Field-Constructed Chase Top Flashing
• Field-constructed flashing must be constructed of 24 GA
minimum sheet metal or other suitable non-combustible
materials.
• The flashing must be oversized to allow 1/2 in. air gap
around all four sides.
• Include a minimum 1 in. turn down and a 1/2 in. drip edge
(optional) to prevent water from seeping into the chase.
Refer to Figure 8.16.
• Additional non-combustible structural supports can be
field-fabricated to help support the Chase Top Flashing
if needed, provided the air ventilation requirements are
maintained. See Figure 8.15.
• Spacing clips can be field-fabricated as needed out of 24
GA sheet metal or other suitable non-combustible material
(refer to Figure 8.13), or purchased from Hearth & Home
Technologies Inc.
• Secure the Chase Top Collar section to the field-fabricated
flashing with sheet metal screws or rivets (Figure 8.15).
• Seal Chase Top Collar section to flashing with non-
hardening waterproof sealant to ensure a weather tight
connection. See Figure 8.15.
• Insect-guard screening may be added between the chase
and flashing.
• Install the Chase Top Flashing at the top of the chase with
a 1/2 in. minimum air clearance off the top of the chase
construction (Figure 8.13).
• Spacing clips can be field-fabricated as needed out of 24
GA sheet metal or other suitable non-combustible material
(refer to Figure 8.13)
• Insect-guard screening may be added between the chase
and Chase Top Flashing.
• Secure the Chase Top Flashing to the chase with at least
three screws or nails per side.
• When installed, the bottom of the chimney cap must be
at least 6 in. above the Chase Top Flashing.
• Secure the chase top flashing to the chase with at least
three screws or nails per side.
• When installed, the bottom of the chimney cap must be
at least 6 in. above the flashing (Figure 8.16).
Note: 30 spacing clips and
20 ft insert-guard screening
are included with the unit.
Heatilator • Birmingham BIR50-B • 4059-682D• 9/12