©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
