Heart & Home Collectables MHR36, MHC36 manual 9. MH842 Ceiling/Roof Thimble

MHC36 AND MHR36 INSTALLATION INSTRUCTIONS

9.MH842 Ceiling/Roof Thimble

See Figures 14 and 15.

a.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. square opening (measured on the horizontal) through the ceiling and roof structure. See Chapter 25 of the Uniform Building Code for roof framing details.

b.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.

c.To attach the extension to the thimble, 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.

d.Install the thimble assembly and nail it securely to the framing members.

e.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

f.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.

g.Finish assembling the chimney, storm collar and termination cap following the installation instructions provided with them.

Figure 14 - Ceiling/Attic Construction

Note: Roofing shingles must be below the flash- ing plate on the lower side of a sloped roof and over the flashing plate on the sides and top.

Note: The closed end of the thimble is positioned towards the bottom.

Figure 15 - Installing an MH842

08/04 31072 Rev G 17