Mark the Exit Point of the Roof
Locate the point where the chimney will exit the roof by plumbing down to the center of the chimney. Drive a nail up through the roof to mark the center. See Figure 6.2.
Cut Out the Hole in the Roof
Measure to either side of the nail and mark the 17 in. x 172 in. (432 mm x 432 mm) opening required. This is measured on the horizontal; actual length may be larger depending on the pitch of the roof. Cut out and frame the opening. See Chapter 25 of the Uniform Building Code for roof framing details.
WARNING
Fire Risk
•Must maintain 2 in. (51 mm) air clearance to insulation and other combustible materials.
Assemble the Chimney Sections Through the Roof
Continue to add chimney sections through the roof open- ing, maintaining at least a 2 in. (51 mm) air space to com- bustible materials.
Install the Roof Flashing
If a roof flashing is to be used, install the roof flashing appropriate to the roof pitch and install a round termination cap and storm collar following the instructions shipped with the cap.
Install the Chimney Air Kit (required in Canada)
When installing the chimney air kit, follow the instructions provided with this accessory.
Figure 6.2 Ceiling/Attic Construction
26 | Heatilator • I80 |
