Hearth and Home Technologies BIR50-B owner manual Field-Constructed Chase Top 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).

1 1/2 in. ventilation opening around chimney pipe

1/2 in. air space established by spacing clips

1/2 in. Air Space

Storm collar must be installed 1 in. off chase top

Spacing Clips

Chase top flashing

Roof radiation shields

Required spacing clips

Figure 8.14

	Sealant
Chase Top
Collar	Screw or
	Pop-rivet

Note: 30 spacing clips and 20 ft insert-guard screening are included with the unit.

Figure 8.13

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.

Screws
to hold	Insect
flashing to
chase top	Screen
Additional
Structural Support
Roof Radiation Shields
placed here
Figure 8.15

1 1/2 in. ventilation
opening around	Chase Top Collar
chimney pipe

Slope downward

Turn-down

Drip edge

Insect-guard screening may be added between chase and chase top flashing.

Figure 8.16

Heatilator • Birmingham BIR50-B • 4059-682C• 8/12 29