GAF METALASTIC User manual

METALASTIC™CMF Curb Mount Flange
Expansion Joint Cover
Updated: 8/16

©2016 GAF 8/16 gaf.com • 1-800-ROOF-411
METALASTIC™CMF
CURB MOUNT FLANGE
EXPANSION JOINT COVER (1 OF 2)
INSTALLATION GENERAL NOTES:
• The roofing membrane must extend to
the top of the nailer.
• CMF expansion joint nailers must be
mechanically attached 8" (203 mm)
on center.
• Wide curbs must be sloped or canted
to prevent standing water.
• All joints and patches are to be done using
Metalastic™materials only.
• Flanges must be sealed to roof membrane
with Metalastic™Tape Sealant.
• All surfaces being sealed with Splice Lock
or receiving Metalastic™Tape Sealant
must be clean and dry. A hot air blower
can be used to dry surfaces.
Safety Warning
• Wear safety glasses when nailing or
using adhesives to prevent eye injuries.
• Wear protective gloves when working
with adhesives.
• Read cautions on labels of adhesive and
sealant containers. Improper care or use
can cause serious injury.
Installation Procedures:
A. Unroll the CMF on top or along side
of the curb where it is to be installed,
foam side down. Then position on top
of the curb. Fold an outside nailer back
and align the first inside metal nailer
on top of the curb with the foam along
the opening. Nail in place 8" (203 mm)
on center.
B. Fold the opposite side nailer back
and position the second inside
nailer on top of the second curb.
Nail in place.
C. Fold the flexible flanges down the
curb face and mark where they end.
Fold the flexible flange back and
apply the Metalastic™Tape Sealant
to the vertical surface just above the
mark. Fold the outside nailers down
in place. Nail 8" (203 mm) on center.
An ASTM D4586 Type II plastic
asphalt cement compatible with the
roofing membrane may be used in
place of Metalastic™Tape Sealant.
A
B
C
CMF with Wide Curb one side

©2016 GAF 8/16 gaf.com • 1-800-ROOF-411
METALASTIC™CMF
CURB MOUNT FLANGE
EXPANSION JOINT COVER (2 OF 2)
Joints
D. Trim metal nailers back 1/8" (3 mm) to prevent over-
lapping of the nailers and allow the bellows to butt
firmly together.
E. Nail both inside nailers in place as described above,
being careful to butt bellows together.
F. Apply the Metalastic™Tape Sealant where the outside
nailers will fall. Nail in place 8" (203 mm) on center.
Splicing Joints
G. Ensure surfaces are clean and dry. In cold weather
use a hot air blower to dry surfaces. Peel the release
paper back about 3" (76 mm) from one end of the
Splice Lock, and align it with one edge centered over
the joint. Press in place working from the edge toward
the bellows, peeling release paper off as needed.
WARNING! Metalastic Tape Sealant is extremely
tacky and will adhere to ANYTHING it comes in
contact with. It cannot be repositioned.
H. Make sure the Splice Seal makes full contact and
does not bridge over spots.
I. Use a hand roller to thoroughly roll the Splice Seal to
ensure 100% contact
Coal Tar Pitch – Special Instructions
If the Metalastic™CMF is to be used with a coal tar pitch
roofing system, a barrier of non-coal tar mastic and
felt MUST be placed between the Metalastic CMF
membrane and the coal tar materials.
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