Instructions / Assembly

1
TRI-PLY
®
Design and Application Instructions
TRI-PLY
®
GENERAL INSTRUCTIONS
ROOFING DESIGN CONCERNS
This list represents the most commonly encountered roofing situations
that can influence the performance of a roofing system. It is not all-in-
clusive, and should not be looked upon as representing all situations that
may be encountered or considered.
1. Drains
a) The use of plastic drains is not recommended and is not
acceptable for installations.
b) A minimum of 2.5 lb (1.13 kg) lead sheeting must be
incorporated in the drain flashing design.
c) Drains must have properly installed clamping rings.
2. Pitch Pans
a) The use of pitch pans is not recommended. Pitch pans are
maintenance items that can become nuisances if ignored or
improperly used or installed.
b) Pitch pans are not covered by GAF guarantees.
3. Metal Flanged Skylights and Other Rooftop Equipment
a) Due to the differential expansion between metal and asphalt,
large metal flanges are undesirable surfaces to flash to with
BUR and modified bitumen materials.
b) Flashing to these metal flanges is not covered by
GAF guarantees.
c) Such units should be mounted on canted wood curbs at least
8" (203 mm) above the level of the roof.
4. Plumbing Vents
a) The use of primed lead flashing sleeves is required due to better
compatibility between lead and asphalt roofing systems as com-
pared to sheet metal flashing.
b) Lead sleeves on plumbing vents are required.
5. Gravel Stops
a) All gravel stops should be raised to push water to proper
draining locations.
b) The membrane should be nailed to raised perimeter nailers and
counterflashed with metal counterflashing where at all possible.
c) Where metal gravel stop flanges are flashed to the roof mem-
brane, leaks caused by metal movement are not covered by
GAF guarantees.
6. Air Conditioning Units
a) Where at all possible, install such units at ground level.
b) If such units are to be installed on the roof, they must be
mounted on at least 8" (203 mm) high canted wood curbs or
platforms secured to the structural members of the roof. The
curbs or platforms must be properly flashed and counterflashed.
c) Do not use wood sleepers for supporting these units directly
on the roof membrane. GAF guarantees do not cover leaks
caused by units mounted on sleepers laid directly on the
roof membrane.
7. Piping and Conduit on Rooftop
a) Piping and conduit should not be run across a roof.
b) Where no alternative exists, the piping/conduit should be
elevated at least 8" (203 mm) above the surface of the roof on
supports that are secured to the structural roof members or the
deck if light pipes. These supports must allow for the movement
of the pipes and must be flashed with Tri-Ply
®
materials.
c) Leaks resulting from improper supports are not covered by
GAF guarantees.
d) Where continuing piping and conduit penetrate the roof, a two-
piece, soldered, noncorroding sheet metal sleeve should be
installed in conjunction with a metal umbrella.
8. General Flashing Considerations
a) All flashing must be installed at least 8" (203 mm) above the
immediate roof membrane level.
b) All flashing must be mechanically attached at its top.
c) Counterflashing is required and must extend at least 4' (1.22 m)
below the top nailing.
d) Counterflashing is not covered by GAF guarantees.
e) Termination bars may only be used in conjunction with an
appropriate counterflashing extending a minimum of
4" (102 mm) below the termination bar. Fastener spacing
must be 4" (102 mm) or 8" (203 mm) as determined by flashing
height as listed in the individual flashing specifications.
9. Coatings
a) Asphalt solvent-based coating must not be used on new
granular-surfaced rolls.
b) Reapplication of coating must be employed as a part of periodic
maintenance program. The frequency will vary depending on
climatic conditions.
STORAGE AND INSPECTION OF ROOFING MATERIALS
Tri-Ply
®
roofing materials leave the factory dry and must be maintained
in storage to prevent the materials from getting wet. Provisions must
also be made for storing in a well-ventilated, ambient temperature
environment out of the weather. Water-based coatings must be protected
from freezing.
At the job site, no more material should be stored than will be used
within two weeks; it should be stored on pallets, roll goods on end, in
a well-ventilated area. Where dry inside storage is not possible (such
as where new concrete floors or extensive plastering results in a high
humidity), storage under secured canvas tarpaulins in a well-ventilated
area is acceptable for periods up to two weeks. For periods longer than
two weeks, the materials should be properly warehoused, i.e., dry, venti-
lated, on pallets, etc. Polyethylene covers are unacceptable field covers.
Rooftop storage of roofing should be on pallets, rolls on end, and pro-
tected with properly secured vapor permeable covers such as canvas tar-
paulins. No more material should be stored on the roof than can be used
within five days. When prolonged inclement weather threatens, i.e., rainy
seasons, no more roofing materials should be supplied to the rooftop
than can be used within two days.
In the unlikely event that obviously defective or damaged material reaches
the job site or damage to the material occurs from improper storage on
the job site, it is the responsibility of the roofing contractor not to install
this material. In the case of material that has obvious manufacturing
defects, GAF should be notified immediately so replacement material can
be supplied if the complaint is justified. Installation of defective material
can result in additional costs above the cost of supplying replacement
material. If the roofing contractor chooses to install material with obvious
defects, this added cost is not the responsibility of GAF.
CONDITION AND PREPARATION OF ROOF DECK SURFACE
All open edges must have wood nailers. On steel or concrete roof decks
of any kind, use treated wood nailers along all open or flush eaves so that
gravel-stops or edging strips may be securely nailed. Wood nailers may also
be needed at other projections through the roof.
Prime masonry and metal surfaces to receive a mopping of roofing asphalt
with asphalt/concrete primer and allow to dry thoroughly.
The surface of a roof deck should be dry, firm, smooth, and free of dirt
and loose material. It is the responsibility of the roofing contractor, deck
contractor, and owner’s representative to determine the suitability of the
roof deck surface to receive the roof assembly.
Electrical conduits, bolts, and other similar small items must be removed
from the surface of the roof deck; such surface irregularities cannot be
properly insulated and roofed.