DuraVent DuraTech 5-8 - Manual (Page 19)

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screws. Once the chimney is at the minimum
height specified in Fig.1, attach the Chimney
Cap onto the top of the chimney by holding
it by the collar and twist locking it clockwise
onto the Chimney Pipe. If the chimney
penetrates an overhang, frame for at least 2”
of clearance, and install Flashing and Storm
Collar as described in Steps 9 & 10 for “Ceiling
Supported” Installations. Another option is
to cut away the overhang for a 2” clearance
(Fig.28). If the chimney extends more than 5’
above the top Wall Strap or Flashing, use an
Extended Roof Support Bracket.
9. Install Chase Top Flashing: It is
recommended that a Tee Supported Chimney be
enclosed in a chase. If a chase enclosure has
been constructed, you can either use a standard
flat-roof flashing, or you can use a Chase Top
Flashing. Using a Chase Top Flashing allows
for a lower profile for the chimney. The Chase
Top Flashing has an opening that is 3” larger
in diameter than the DuraTech Chimney. If the
Chase Top Flashing can fit over your chase
enclosure as required (Fig.29) then install as
directed, or trim as needed. However, if the
Chase Top Flashing is smaller than your chase
enclosure, you will need to provide a galvanized
sheet capable of covering your chase and
overhanging the sides by 1/2 - 3/4 inch. Attach
the Chase Top Flashing to the galvanized sheet
using appropriate sheet metal screws and non-
hardening waterproof sealant. Use the Chase
Top Flashing Spacers to allow the proper air-gap
clearances on the galvanized sheet. The Chase
Top Flashing Spacers are available to insure
that the proper air-gap is maintained. Fig.29
displays how these air gaps are established using
the Spacers and Chase Top Flashing. Secure
the Chase Top Flashing to the chase using a
sufficient number of #8, 1-1/2” wood screws,
ensure the air gap is maintained between the
flashing and the chase. Seal the screw heads
with non-hardening sealant. When installing the
Storm Collar, allow a 1” air space between the
Figure 27
EXTENDED ROOF
SUPPORT BRACKET
ADJUSTABLE WALL
STRAP
ADJUSTABLE
FLASHING
2 INCHES MIN
FRAMED CHASE
ADJUSTABLE TEE
SUPPORT
ACCESS DOOR
FOR CLEANING
2 INCHES MIN
6 INCHES MIN
INTO ROOM
Figure 26
MIN 6 INCHES
CLEARANCE
BETWEEN CAP AND
CHASE TOP
ACCESS DOOR
FOR CLEANING
CHASE TOP
FLASHING
FRAMED EXTERIOR
ENCLOSURE
TYPICAL THRU-
THE-WALL TEE
SUPPORTED
INSTALLATION