Imperflex USA is a smooth surfaced, SBS polymer modified bitumen underlayment. It is intended For use primarily as a residential roof underlayment to protect against water infiltration from ice and water dams at penetrations, valleys and edges On sloped roofs. It must be used as the base sheet for MSA. MSA will not adhere properly to other sheets due To anti-blocking media used to prevent the material from sticking together in the rolls. It can also be used to waterproof below-grade foundations, footings and basements.

It is composed of select SBS polymers blended with distilled asphalt, and reinforced with high-strength fiberglass mat. The membrane Is protected on the bottom by a split, silicon-coated release film, which must be removed before installation. The release film prevents the roll from sticking during storage And aids in installation.

For use with Imperflex MSA, the slag surfaced USA must be used inverted with the slag surface down and mechanically fastened, with the self-adhering side up for a self-adhering to self-adhering application. The split release paper must be left in place until ready to install the MSA cap sheet membrane, to protect the self-adhering surface as long as possible. Never install MSA to the slag surface. The slag surface must only be up when used as a self-adhering ice and water protection underlayment membrane.

The membrane is coated on top with factory installed refractory slag or polyethylene film. Note: you must specify which surface you require when ordering. The membrane is durable, resists coating slide at normal roof temperatures, self-sealing and resists water infiltration from snow and ice accumulation.