Install Attic Insulation Shield; Install Roof Radiation Shields; Attach Flashing - Heatilator BIR50-B Installation Manual

K. Install Attic Insulation Shield
The attic insulation shield must be installed where the
chimney passes into an attic. Its purpose is to prevent de-
bris and insulation from getting too close to the chimney.
In attic areas where this shield cannot fi t, or is not used
you must enclose the attic portion of the chimney in a
framed enclosure. If the chimney is fully enclosed through
the attic, an attic insulation shield is not required. Install
the attic insulation shield as follows:
• Remove any insulation from attic fl oor around the framed
opening.
• Assemble chimney sections until at least 18 inches of
chimney extends above the fi restop.
• Slip the attic insulation shield over the chimney until the
base sits squarely on the framed opening (Figure 4.10).
• Secure the attic insulation shield to the top of the framed
opening using at least two 8-penny nails or two #8,
1-1/2 in. wood screws per side (Figure 4.11).
• Wrap the collar of the attic insulation shield around the
chimney and fasten it loosely. Slide the collar down
to meet the attic insulation shield. Tighten the bolts to
secure the collar in place (Figure 4.11).
Attic
Figure 4.10
Attic
Figure 4.11
20 Heatilator • Birmingham BIR50-B Installation Manual • 4059-701 • Rev B • 2/6/13
Attic
Insulation
Shield
Firestop
Attic Shield
Collar
Firestop
L. Install Roof Radiation Shields
Roof radiation shields must be used to provide protection
for roof or chase framing members.
Note: Roof radiation shields do not allow for a reduced
clearance to combustibles.
Clearance to combustibles must be a minimum of 2"
away from the chimney pipe.
• Install roof radiation shields at either the top of the chase
or where the chimney penetrates the roof, whichever is
the top of the installation.
• Roof radiation shields are built with a 1/2" air gap standoff
from the joist face (Figure 4.12). The corners of the roof
radiation shields overlap each other to ensure proper
position.
• Secure the roof radiation shields to the top of the framing
members using screws or nails in the corners.
• If framing members are further away from the chimney
than 2 in., center the roof radiation shield to the chimney
on the framing member and secure in place with screws
or nails.
Figure 4.12
M. Attach Flashing
For chase enclosures, use the chase top fl ashing. The
chase top fl ashing allows for a 1-1/2 in. clearance main-
tained from the chimney (Figure 4.14) and provides
required ventilation air.
• Chase top fl ashings (includes chase top collars and
spacing clips) are available from your HHT dealer.
• Additional non-combustible structural supports can be
fi eld-fabricated to help support the chase top fl ashing
if needed, provided the air ventilation requirements are
maintained. See Figure 4.15.
• If the chase top fl ashing (40 in. x 40 in.) does not ensure
the minimum 1/2 in. spacing and perimeter ventilation
requirements as shown in Figure 4.13., use a chase top
collar and fi eld-construct the fl ashing as needed for the
chase dimensions. Skip to Field-Constructed Chase
Top Flashing.
(4) Roof
Radiation
Shields
Chase
Enclosure