21
Heatilator • Birmingham BIR50-B Installation Manual • 4059-701 • Rev G • 06/29/15
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 4.13
Figure 4.14
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 4.15
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 4.16
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 4.16.
• 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 4.15.
• Spacing clips can be field-fabricated as needed out of
24 GA sheet metal or other suitable non-combustible
material (refer to Figure 4.13), or purchased from Hearth
& Home Technologies.
• Secure the chase top collar section to the field-fabricated
flashing with sheet metal screws or rivets (Figure 4.15).
• Seal chase top collar section to flashing with non-
hardening waterproof sealant to ensure a weather tight
connection. See Figure 4.15.
• 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 4.13).
• Spacing clips can be field-fabricated as needed out of
24 GA sheet metal or other suitable non-combustible
material (refer to Figure 4.13)
• 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 4.16).
Note:
30 spacing clips and
20 ft insert-guard screening
are included with the unit.
