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F. Thimble Installation - Manufactured Hous-
ing
ATTIC INSULATION SHIELD NOT REQUIRED WHEN
THIMBLE APPLICATION IS USED.
• 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. The thimble extension is required
when the ceiling/roof thickness exceeds 12 1/2 in. The
extension should overlap the thimble 1 in.
• Drill 1/8 in. 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/screw it securely
to the framing members.
• Center the flashing over the chimney and fasten it
appropriately to the roof using nails or screws. 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/screw heads must
be caulked with a roofing sealant.
• Finish assembling the chimney, storm collar and
termination cap following the installation instructions
provided with them.
NOTE: Roofing shingles must be below the flashing plate
on the lower side of a sloped roof and over the flashing
plate on the sides and top.
Figure 5.8
MH Thimble Installation
Heatilator • LM42 • Installers Manual • 4087-901 • Rev A • 04/14/16
27
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