Cathedral Ceiling Installation - Breckwell BH23 Owner’s Instruction And Operation Manual

Wall
Strap
Offset with Wall Strap and 45° Elbows
If area above is a room, install firestop
above framed hole as shown
9
Nails
If area above is not a room, install
firestop below framed hole as shown
NOTE: You must increase vent height for steep roof pitches.
Nearby trees, adjoining roof lines, steep pitched roofs, and
other similar factors may cause poor draft or down-drafting
in high winds. Increasing the vent height may solve this
problem.
NOTE: If the vent pipe passes through any occupied areas
above the first floor, including storage spaces and closets,
you must enclose pipe. You may frame and sheetrock the
enclosure with standard construction material. Make sure
to meet the minimum allowable clearances to combustibles.
Do not fill any of the required air spaces with insulation.

CATHEDRAL CEILING INSTALLATION

IMPORTANT:
REVIEW ALL INFORMATION ON PREVIOUS PAGE BEFORE
PLANNING THIS INSTALLATION. CATHEDRAL CEILING
INSTALLATIONS CAN BE VERY TRICKY
© 2021 Breckwell Hearth
Roof
Flashing
45° Elbows
Ceiling Firestop
Nails
Firestop
9
"
"
Firestop
VENTING INSTALLATION
Cathedral Ceiling Support Box Installation
Cut Hole 1/8" Larger
Than Support Box When
Projected Onto Roofline
Installed Cathedral Ceiling
Support Box
1. Remove shingles or other roof covering as necessary to
cut the rectangular hole for the support box. Mark the
outline of the cathedral ceiling support box on the roof
sheathing using the locating hole as a center point.
2. Cut the hole 1/8" larger than the support box outline.
3. Lower the support box through the hole in the roof
until the bottom of the box extends at least 2" (50 mm)
below the ceiling. Align the support box vertically and
horizontally using a level. Temporarily tack the support
box in place through the inside walls and into the roof
sheeting.
4. Using tin snips, cut the support box from the top corners
down to the roof line and fold the resulting flaps over
the roof sheeting. Apply a bead of non-hardening
mastic around the top edges of the support box to make
a seal between the box and the roof. Nail in place
with roofing nails. Remove any combustible material
that might be inside the support box.
5. Complete the cathedral ceiling installation by following
the same procedures outlines in Steps 2 through 6 for
Flat Ceiling Installation.
26
Cathedral
Ceiling
Support
Box
2" min.
Below
Finished
Ceiling
Apply
Non-hardening
Mastic Under all
Edges of Support
Box Before Nailing