SECTION 3 - HANDLING, STORAGE, AND INSTALLATION
PACE
│
Installation & Assembly Manual
Issue Date: 07/03/2018
96
Form PA102.20-N1
Upper Duct Section Not
Continuous Through Roof
Sealant
Wood Nailer Norminal 2 X 4
Flashing Receiver
Lower Duct Section
Counterflashing
Curb
Base Flashing
Roofing Plies
Deck
Cant Strip
Upper
Section
LD06494a
Figure 158 -
Duct Penetration of Roof
• Seal all penetrations into the ducts until water-
tight. Use a minimum of duct penetration when
attaching the supports.
• Provide adequate clearances between the ducts
and roof penetration openings.
• Duct systems should not be pressurized without
sufficient time for curing the sealant systems. Fol-
low the sealant manufacturer's recommendations
for applying the sealant.
• Support the ducts to avoid the transfer of duct
weight across flexible connections as shown in
.
• Horizontal ducts should be pitched and provided
with drainage outlets.
• Install the ducts at a height sufficient to install
roofing and flashing. Refer to the
Figure 159 -
Roof to Duct Installation (Horizontal
Discharge)
LD06337b
Duct
Seams And
Joint In Ducts
Roof
Curb
Front Or Rear
Discharge Unit
Duct Wall Penetrations
Roof Support
Elevate Bottom Of Duct