PG 10
attic areas where this shield cannot fit, a Square Ceiling Support Box, (which are
available in heights of 11”, 24”, and 36”), can be used instead of an Attic
Insulation Shield, provided it reaches through the roof; refer to the Roof
Supported Installation section on page 14. If the chimney is fully enclosed
through the attic, an Attic Insulation Shield is not required.
Where the chimney passes into the attic, install the Attic Insulation Shield as
follows:
a. If the Firestop Radiation Shield extends above the attic floor, no
modifications are necessary. The Firestop Radiation Shield will fit inside
the Attic Insulation Shield. If the Square Ceiling Support Box extends into
the attic above the framing you will need to trim the box down.
b. Assemble Chimney Sections until at least 18 inches of chimney extends
above the Firestop Radiation Shield or Square Ceiling Support Box.
c. When applicable extend the Firestop Radiation Shield tube extension
(keep at least 1” overlap), and secure in place using sheet metal screws.
d. Slip the Attic Insulation Shield over the chimney pipe until the base sits
squarely on the framed opening (Fig 6 & 9).
e. Secure the Attic Insulation Shield to the top of the framed opening using at
least (3) 8-penny nails or (3) #8, 1-½” wood screws per side (Fig 9).
f. Wrap the Collar of the Attic Insulation Shield around the chimney and
fasten it loosely with the supplied hardware. Slide the Collar down to meet
the Attic Insulation Shield. Tighten the hardware to secure the Collar.
9.
Attach Roof Flashing:
In new construction, assemble the Chimney Sections to
a point above the roof, then slip the Roof Flashing over the chimney. On an
existing roof, center and install the Roof Flashing before extending the chimney
above the roof. Allow space to permit sliding the next Chimney Section up
through the Roof Flashing. Always ensure the chimney remains vertical (use a
level), and that at least a 2 inch clearance to combustible materials is maintained
all around. Install the upper edge of the Roof Flashing under the roofing material
(shingles). Nail to the roof along the upper edge and down each side with 1 inch
roof nails. Do not nail the lower edge of the Flashing. Be sure to follow local
building practices as needed. Seal all nail heads with a non-hardening
waterproof sealant. On flat or tarred and gravel roofs, nail and seal the Flat Roof
Flashing to the roof on all sides of the roofing compound. Do not put screws
through the Roof Flashing into the Chimney Pipe.
10.
Finish Top:
Apply a high-temperature (500
℉
), non-hardening waterproof sealant
around the chimney at the point where the Storm Collar will meet the chimney
just above the Roof Flashing, and also along the vertical seam of the chimney
AllFuel HST Inc
Toll Free: (833) 326-8368
