Roof Penetration; Manufactured Home Installation - Heatilator C40 Installation Manual

G. Roof Penetration
• Refer to Figure 6.10.
• Plumb from roof to center of chimney.
• Drive a nail up through roof to mark center of pipe.
• Measure to either side of nail and mark the 14-1/2 in. x
14-1/2 in. (368 mm x 368 mm) opening required.
• Measure opening on the horizontal; actual length may
be larger depending on roof pitch.
• Cut out and frame opening.
• Refer to Chapter 25 of the Uniform Building Code for
roof framing details.
Install Flashing
• Assemble chimney so it passes through the framed
opening.
• Slip the fl ashing over the chimney.
NOTICE: Roofi ng shingles must be below the fl ashing
plate on the lower side of a sloped roof and over the
fl ashing plate on the sides and top.
• Nail the fl ashing to the roof. Keep gaps between the
fl ashing plate and the roof to a minimum.
• Caulk the fl ashing plate and roof junction as well as
the vertical seam on the fl ashing. All nail heads must
be caulked with a roofi ng sealant.
• Caulk the overlap seam of any exposed pipe sections
that are located above the roof line to prevent leaks.
H. Manufactured Home Installation
SL-300 Series Ceiling/Roof Thimble
NOTICE: REQUIRED for manufactured homes.
• 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.
• 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.
• 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.
• Install the thimble assembly and nail it securely to the
framing members.
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Heatilator • C40 Constitution • 480-2340 Installation Manual • Rev B 01-29-13
Figure 6.10 Ceiling/Attic Construction
• Center the fl ashing over the chimney and nail it to the
roof using the Stormguard nails provided. Keep gaps
between the fl ashing plate and the roof to a minimum.
Caulk the fl ashing plate and roof junction as well as the
vertical seam on the fl ashing. All nail heads must be
caulked with a roofi ng sealant.
• Finish assembling the chimney storm collar and
termination cap following the installation instructions
provided with them.
FLASHING
Figure 6.11 Installing Part: 12966A, Confi guration 1
CHIMNEY
FLASHING
PLATE
JOISTS
NAIL
THIMBLE