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NAIL
FLASHING
PLATE
CHIMNEY
THIMBLE
EXTENSION
SCREW
FLASHING
THIMBLE
ADJUSTABLE
EXTENSION
HOLES
FLASHING
CHIMNEY
FLASHING
PLATE
NAIL
THIMBLE
SCREW
THIMBLE
EXTENSION
1. Locate the point where the chimney will exit the roof by
plumbing down to the center of the chimney. Lay out,
cut and frame a 14-1/2 in. (368 mm) square opening
(measured on the horizontal) through the ceiling and roof
structure.
Consult local codes for framing details.
2. The thimble must extend completely through the roof
structure shielding combustible materials. Five location
holes have been provided to allow for a variety of ceiling/
roof thicknesses. A Thimble Extension is required when
the ceiling/roof thickness exceeds 12-1/2 in. (318 mm).
The extension should overlap the thimble one inch.
3. To attach the extension to the thimble, drill 1/8 in. (3 mm)
holes through the outer shield of the thimble using the
predrilled holes in the extension as guides. Attach the
extension to the thimble using the screws provided with
the extension.
4. Install the thimble assembly and nail it securely to the
framing members.
5. Center the flashing over the chimney and nail it to the
roof using the
Stormguard
nails provided. Keep gaps
between the flashing plate and the roof to a minimum.
Caulk the flashing plate and roof junction as well as the
vertical seam on the flashing. All nail heads must be
caulked with a roofing sealant.
6. Finish assembling the chimney storm collar and termina-
tion cap following the installation instructions provided
with them.
CHIMNEY
FLASHING
PLATE
JOISTS
NAIL
THIMBLE
FLASHING
Figure 8.15 Installing Part 12966A, Configuration 2
NOTICE:
REqUIRED for manufactured homes.
Figure 8.14 Installing Part: 12966A, Configuration 1
Figure 8.16 Installing Part 12966A Configuration 3
N. SL-300 Series Ceiling/Roof Thimble