Instructions / Assembly

3
TEMPORARY WATER CUTOFFS AND PHASED CONSTRUCTION
All Tri-Ply
®
roofing systems must be made watertight at the end of each
workday. Ideally, an entire roof area will receive the installation of the
complete new roof system, including all board insulation, membrane
plies, and flashings, in one day. When this is not possible, the exposed
edges of the new roof system must be sealed so as to prevent water pen-
etration and wind infiltration into the new roof assembly. Any such water
cutoffs must be completely removed before resuming work.
The installation of the Tri-Ply
®
roofing system shall progress in such a
manner so that proper drainage of both the existing roof area and the new
roof installation is maintained.
RECOMMENDED PROCEDURES FOR APPLYING INSULATION
General
Do not apply roof insulation and roofing until all other work trades have
completed jobs that require them to traverse the deck on foot or with
equipment.
It is recommended that insulation be applied in more than one layer, if
feasible, with joints staggered between layers. The roof insulation must
be firmly attached to the deck. Whenever possible, the first layer should
be mechanically fastened while the second layer is applied in a continu-
ous mopping of hot steep asphalt at the rate of 25 lb (11.3 kg) (plus or
minus 20%) per 100 square feet (9.2 sq. m) and joints staggered in
parallel courses as well as between layers. If roof tape is specified, top
layer joints of insulation may be continuous in both directions.
Cut all insulation to fit where it meets vertical surfaces. Cut ¼" (6 mm)
short where insulation meets vertical flashings. Miter edges of insulation
panels at ridges and elsewhere to prevent irregular surfaces and open
joints. Butt edges moderately as to not deform them.
Decks must be designed to drain freely with sufficient outlets placed and
installed to promptly and thoroughly remove water from roof.
If additional taper is required, perlite tapered roof insulation can be
utilized. All hip and valley panels should be mitered. Laced valleys are
not acceptable.
Roofing should not be applied over wet insulation. Any insulation that has
become wet or damp must be removed and replaced.
Drill-Tec
™
Mechanical Fasteners
Mechanical attachment of insulation to the roof deck is the preferred
method of installation whenever practical and is required by GAF and FM
on steel decks. Tri-Ply
®
Fasteners may be used to fasten EnergyGuard
™
Polyiso Insulation to most roof decks including steel, wood, and con-
crete. Where Drill-Tec
™
Fasteners are employed, they must be used at the
minimum rate to achieve FM I-60 uplift resistance.
Application Over Steel Decks
The steel deck installation should conform with FM’s recommendations.
Consult the current Factory Mutual Loss Prevention Data Sheet 1-28 and
Approval Guide for details on the roof system being installed and for the
recommended number of fasteners per insulation board.
Apply panels of insulation with long sides continuous, either parallel or
at right angles to steel deck ribs. The opposite edges of panel must rest
firmly on the bearing surface of the steel deck. Joints of parallel courses
of insulation should be staggered.
The insulation panels are placed in position immediately ahead of the fas-
tening crew. Sight along the top flanges of the metal deck section or snap
a chalkline. Place Drill-Tec
™
Fastener plates in a pattern that will enable
the screws to contact and penetrate the top flange of the metal deck a
minimum of ¾" (19 mm). Drive screws through the holes in the plates,
insulation, and into the metal deck using an electric screw gun. Repeat
across the entire area to be fastened.
If additional layers of insulation are used, secure in a continuous
mopping of hot steep asphalt applied at the rate of 25 lb (11.3 kg)
(plus or minus 20%) per 100 square feet (9.2 sq. m) and stagger joints
in parallel courses as well as between layers. If joint tape is specified,
the top layer of insulation joints may be continuous in both directions.
As an alternate to asphalt, both layers of insulation can be mechanically
fastened simultaneously.
Application Over Wood, Precast, or Preformed Nailable Decks
This recommendation is for use when installing insulation over decks
capable of adequately holding fasteners that are recommended by GAF
or the deck manufacturer. The condition of the deck must be carefully
examined to determine the capacity of the deck to hold the fasteners.
Application of Insulation Without Underlayment
Panels of EnergyGuard
™
Polyiso Insulation should be applied with long
joints running continuously and short joints staggered. The insulation
should be mechanically attached using the appropriate approved fastener
or fastener recommended by the deck manufacturer. Nails are not to be
used to fasten insulation to decks. When additional layers of insulation
are used, the second and succeeding layers should be applied in a con-
tinuous mopping of hot steep asphalt at the rate of 25 lb (11.3 kg) (plus
or minus 20%) per 100 square feet (9.2 sq. m) and joints staggered in
parallel courses as well as between layers. As an alternate to asphalt, both
layers of insulation may be mechanically fastened simultaneously.
MECHANICALLY ATTACHED BASE SHEET AND ENERGYGUARD
™
POLYISO INSULATION ASSEMBLIES
Where permitted in the specification, a mechanically attached system can be
used over steel, concrete, and wood decks as an alternative to steep asphalt
attachment of the base sheet. Attachment of both insulation and a #75 Base
Sheet can be accomplished simultaneously employing the Drill-Tec
™
Fastener
System as shown above. This fastener placement is applicable only for the
Drill-Tec
™
3" (76 mm) diameter metal fastener. The use of other fasteners is
not recommended. This specification can be used with insulation boards
with a minimum compressive strength of 16 pounds per square inch (110
kpa) (Test Method ASTM D1621 or C165) and includes isocyanurates and
perlite products.
TRI-PLY
®
Design and Application Instructions
Acceptable
Insulat ion
TRI-PLY
®
#75 Base Sheet
These rows of
fasteners m ust
be staggered
Drill-Tec
™
Fasteners
3" (6 mm) Overlap
12" (305 mm) max.
12"-13"
(305 mm - 330 mm)
12"-13"
(305 mm - 330 mm)
24" (610 mm) max.
18" (457 mm)
12"-13"
(305 mm - 330 mm)
24" (610 mm) max.