Instructions / Assembly

®
3
Temporary Water Cutoffs and Phased Construction
All TRIPLY roofing systems must be made watertight at the end of each
work day. 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
penetration and wind infiltration into the new roof assembly. Any such
water cutoffs must be completely removed before resuming work.
The installation of the TRIPLY 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 pounds (plus or minus
20%) per 100 square feet 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
1
/4 inch
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. Do 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.
Mechanical Fasteners
Mechanical attachment of insulation to the roof deck is the preferred
method of installation whenever practical and is required by GAF
Materials Corporation and FM on steel decks. TRIPLY Fasteners may be
used to fasten TRIPLY Insulations to most roof decks including steel,
wood, and concrete. Where TRIPLY Fasteners are employed, they must
be used at the minimum rate to achieve FMRC I-60 uplift resistance. See
page 8, for suggested insulation fastening patterns.
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
fastening crew. Sight along the top flanges of the metal deck section or
snap a chalkline. Place TRIPLY Fastener plates in a pattern which will
enable the screws to contact and penetrate the top flange of the metal
deck a minimum of
3
/4". Drive screws through the holes in the plates,
insulation, and into the metal deck using an electric screwgun. 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 pounds (plus or
minus 20%) per 100 square feet 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 recommendedbyGAF
MaterialsCorporationor 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 TRIPLY 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
continuous mopping of hot steep asphalt at the rate of 25 pounds
(plus or minus 20%) per 100 square feet 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 TRIPLY Insulation Assemblies
Where permitted in the specification, as an alternative to steep asphalt
attachment of the base sheet or a mechanically attached system for use over
steel, concrete, and wood decks. Attachment of both insulation and a #75
Base Sheet can be accomplished simultaneously employing the TRIPLY
Fastener System as shown above. This fastener placement is applicable only
for the TRIPLY 3" 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 (Test
Method ASTM D-1621 or C-165) and includes isocyanurates and
perlite products.
TRIPLY
®
Design and Application Instructions
Acceptable
Insulation
TRIPLY #75 Base Sheet
These rows of
fasteners must
be staggered
TRIPLY Fasteners
3" Overlap
12" max.
12"-13"
24" max.
18"
12"-13"
12"-13"
24" max.