Instructions / Assembly

®
5
Recover Specifications:
GAF Materials Corporation requires that the new roof membrane be
separated from the old roof system by either the installation of a layer of
GAFTEMP
®
PERMALITE
®
Roof insulation. The maximum insulation board
size is to be 4' x 4'.
Specific Deck Requirements:
Steel, Gypsum, Wood, Tectum
1. Any gravel surfacing must be removed to provide a smooth surface.
2. On smooth surfaced roofs, the old roof surface should be level and
clean.
3. Remove all wet or damaged roof insulation and old, wet membrane.
Replace with new insulation of the same type and cover with new
membrane to complete the repair.
4. Old membrane must be cut on 3 foot centers to allow for the release
of any trapped vapor pressure.
5. Recovering over existing modified bitumen smooth and granule sur-
faced roof systems, requires the use of a mechanically attached insu-
lation.
6. When insulation is used, it must be mechanically fastened with
TRIPLY Fasteners to steel decks. On tectum and gypsum decks, after
removing any gravel, new insulation can be mopped to achieve a min-
imum of 70% attachment. The surface of the old BUR roof surface
must be primed before mopping in the insulation. Install new roof
specification to insulation as outlined in
this manual.
7. Top side venting is required. Use Vent Stacks installed at the rate of
one per 1000 square feet or use perimeter venting.
8. All specification requirements and recommendations listed in this
manual must be followed, i.e., slope, nailing, etc.
9. If the old roof is a coal tar BUR, a mechanically fastened, insulation
must be used. Proper precautions must be taken to ensure that coal
tar drippage into the building does not occur.
Cold Weather Applications
Special care is necessary in applying TRIPLY Membranes at
temperatures below 45˚F. The roof surface must be ice-free and dry.
TRIPLY Membranes must be stored for at least overnight at a
minimum of 55˚F prior to their application. For mop applied TRIPLY
Membranes, asphalt must be at least 425˚ F (with a target temperature
of 425˚F) or 20˚F above the EVT, whichever is higher, at the point of
application. Mopping must not precede the roll by more than five feet.
For both mop applied and torch applied TRIPLY Membranes, the
rolls must be at least 45˚F at the time of application.
TRIPLY
®
Design and Application Instructions
TRIPLY Mineral Surfaced Cap Sheet Installation
TRIPLY Mineral Surfaced Cap Sheet is considered part of the membrane
system as well as surfacing. The application of TRIPLY Mineral
Surfaced Cap Sheet shall commence at low points of the roof so that at
no place is the flow of water against the laps. Parallel lap lines of cap
sheet should not coincide with the lap lines of the underlying piles
wherever possible. Application must be over and parallel to the underly-
ing roofing membrane.
All sheets must be precut into 10 to 12 foot lengths and stacked
prior to application. Sheets may be cut in 15 to 18 foot lengths if the
temperature is 65°F or above. Embed cap sheet in Steep Asphalt
applied at the nominal rate of 25 pounds per 100 square feet. Side laps
must be a minimum of 2 inches and end laps 6 inches. End laps shall
not occur in a continuous line and should be broken by a minimum of
3 feet. Uniformity of the separation of side laps is desirable for best
appearance. All sheets must be firmly embedded in the hot asphalt and
be free of wrinkles, buckles, blisters, fishmouths, or voids.
End laps must be nailed on all slopes exceeding 1 inch per foot.
There are three acceptable methods of application:
1. The "flop in" method involves setting the precut sheet with mineral
surfaced side down adjacent to the area where it is to be applied
with the lap of the previous course exposed. Solidly mop with
Roofing Asphalt the full sheet width to be covered including the lap.
The TRIPLY Mineral Surfaced Cap Sheet should be picked up at each
end and at the outside edge, turned over, and set immediately into
the hot mopping.
2. The "fly in" method involves mopping the full width of the area to be
covered and then picking up a precut sheet and setting it immediately
into the hot mopping.
3. The "reroll" method involves setting the precut sheets so it is in its
exact final position, rerolling it, and then mopping immediately ahead
of the roll as it is rolled in place.
Note: Brooming of the TRIPLY Mineral Surfaced Cap Sheet is desirable in
all cases to ensure completed adhesion. Also, in the “flop in” and “fly in”
methods, tension should be placed on the precut sheet as it is being set to
avoid wrinkles or buckles in the sheet.
Application of the TRIPLY Mineral Surfaced Cap Sheet at tempera-
tures below 50° F is not recommended. At temperatures near 50° F, the
reroll method with complete brooming will provide the best results. Wind
conditions, which may chill the asphalt more quickly, must be considered.