2. Cathedral Ceiling
Step 1.
Follow installation Steps 1 and 2 under vertical installation section, page 15.
Step 2.
Using the
Step 3.
Remove shingles or other roof covering as necessary to cut the rectangular hole for the support box. Cut the hole 1/8 in. (3mm) larger than the support box outline.
Step 4.
Lower the support box through the hole in the roof until the bottom of the support box protrudes at least 2 in. (51mm) below the ceiling (Figure 5.16). Align the support box both vertically and horizontally with a level. Temporarily tack the support box in place through the inside walls and into the roof sheathing.
Level
Cathedral Ceiling
Support Box
2 in. (51mm) Min. below finished ceiling
Cut hole 1/8 in. (3mm) greater in size than pattern of support box as it is projected onto 
roof line
Figure 5.16
Step 5.
Using tin snips, cut the support box from the top corners down to the roofline, and fold the resulting flaps over the roof sheathing (Figure 5.17). Before nailing it to the roof, run a bead of
Figure 5.17 |
Step 6.
Complete the cathedral ceiling installation by following the same procedures outlined in steps 4 through 8 for vertical installations, page 16.
Step 7.
Place the support clamp (provided with the support box) inside the support box (at the bottom), and secure to the pipe section. The clamp allows the support box to support the weight of the pipe sections. Continue to add pipe sections until you are above the roofline.
Step 8.
Install the black trim collar around the outside of the cathedral ceiling support box (Figure 5.18). The two pieces of the trim collar slide over one another to allow for easy adjustment around the support box. Using the six screws provided, secure the four corners and the overlapping sections of the trim collar to the ceiling. You may want to predrill the holes for the overlapped sections for ease of installation.
Trim Collar
Cathedral
Ceiling
Support Screws
Box
Figure 5.18
Page 18 | September 1, 2008 |