APPLICATION (B) Two or More Story Installation of 6S and 8S Chimney
After the frame opening is completed for the ceiling base support (6SCCB or 8SCCB) and the base support
is installed in the first floor level, use a plumb-bob to align and locate the next framed opening in the next floor
levels. Frame an opening 12 1/2” square for 6S or for the 8S, 14 1/2” square. See Figure 2A, and 5. Framed
openings must line up precisely.
Be sure to maintain the required minimum clearance to combustibles.
Install a radiation joist shield (6SJS or 8SJS) from below, at all floors (except roof), above base support with 6d nails
(2 each side, 2” from the ends). This provides firestop at the frame opening and establishes and maintains required
minimum clearance between chimney section and combustible materials in this area.
The final framed openings (to attic) requires the installation of an insulation shield (6SIS or 8SIS). (Remove insulation
from around this area.) Place the female end of the starter pipe section down over the centering flange on the base
support (6SCCB or 8SCCB) (see Figure 3).
Then assemble enough pipe sections to pass from base support (6SCCB or 8SCCB) through the joist shield (6SIS or
8SIS). Assemble pipe by aligning seams and pressing straight down until the click is heard. Remove any insulation or
other foreign materials from inside joist shield that might have fallen in.
Lower the insulation shield (6SIS or 8SIS) down from above, over the pipe until it sets on the framed opening. Using
6d nails, nail down with 2 nails on each side, 2” from the ends. See Figure 4. Next place insulation shield collar over
pipe and push down until it rests on top of insulation shield. Make sure there is no gap between collar and shield.
Tighten the stove bolt and nut which draws the collar tight around the pipe.
Continue installation as required (see Step 2).
STEP 2. Locate the center point where the chimney will pass through the roof by using a plumb-bob. Cut an opening
large enough to provide a
minimum of 2” clearance all around the chimney section
. See figure 5
showing frame opening size required.
3. Install the boot flashing (6 or 8SBF) making sure the flashing cone is centered over the roof opening so the
chimney pipe is plumb and the
2” air space clearances are maintained
. Before attaching the flashing to
the roof, place a bead of caulk under the edges. Slip flashing under overlapping roof shingles as far as
possible before nailing flashing to roof. Trim, cut or replace shingles to fit cone as necessary. Thoroughly
caulk around edges of flashing. Add chimney sections until the pipe extends through the flashing (see Figure
8.)
4. Install storm collar (6 or 8 SSC) on the top pipe section and slide down until it contacts the high side of the
flashing cone. Put a bead of roofing cement between the storm collar and pipe section to insure a leak free
installation.
5. Chimneys shall extend at least 3 feet above the highest point where they pass through a roof of a building
and at least 2 feet higher than any portion of a building within a horizontal distance of 10 feet (see Figure 1).
If the chimney extends more than 6’, external bracing will be required. Plumbers tape may be wrapped
around chimney and secured with a minimum of three (3) guy wires anchored to roof, 120° apart (see Figure
8A).
6. Install the termination cap (6 or 8SU) tightening the screws on collar until the cap is fastened securely to
section.
Figure 8
Figure 8A
GUY WIRES
