Loadmaster Duraperm Air Barrier/Vapor Retarder

DurapermDESCRIPTION: Duraperm Vapor Barrier is a 20 mil. self-adhering preformed membrane consisting of premium grade asphalt bitumen modified with styrene butadiene styrene (SBS) resin and surfaced with a polyethylene film. Duraperm is designed to span across flute openings in steel deck sections. A paper release sheet on the bottom surface allows for proper placement. Upon removal of release paper, Duraperm will adhere immediately to the support surface with slight pressure. Duraperm’s self-sealing qualities around Loadmaster Board Screw Fasteners have been tested and found to maintain vapor barrier qualities (less than .05 perm rating) while experiencing screw penetration up to (10) screws per square foot.

FUNCTION: Duraperm Vapor Barrier  is specially manufactured to adhere to Loadmaster Duraflex Mineral Board as well as direct application over steel deck profiles. It is designed to prevent the migration of interior moisture vapors from entering the roof deck assembly, thus attempting to avoid problems such as mold, mildew and premature failure of the roof membrane.


Thickness 20 mils
Color Grey/White top, Black bottom
Tensile Strength ASTM D412 93 psi
Elongation ASTM D412 300%
Permeance (10 fasteners /sq.ft.) RAMTECH LABS 0.342 perms
Puncture Resistance ASTM E154 5.0 lbs. average

The physical properties listed above are presented as typical average values as determined by accepted ASTM test methods and are subject to normal manufacturing variations. This data is offered as a service to our customers and is subject to change without notice.