Some air barriers are vapor open and allow moisture to escape.
Vapor retarder tpo roofing.
Everyone knows that water in roof systems is never a positive.
To control moisture a vapor retarder may be necessary to protect certain roofing components when high interior humidity is of concern.
Provides temporary weather protection for 90 days provides high tensile strength and puncture resistance.
When vapor drive may be expected to form a dew point under the roof membrane or in the insulation.
When high interior relative humidity is present.
Provides low air and vapor permeability.
Typically a vapor retarder has to have a perm rating of 1 0 or less to be successful.
Firestone enverge air and vapor barrier is an asphalt based self sealing wall barrier that provides energy savings and contributes to better air quality for building occupants.
Self sealing high quality sbs rubber and asphalt blend.
Building owners prefer enverge air and vapor barrier as a sustainable option for their buildings due to the reduced maintenance costs attributed to moisture and.
To control moisture a vapor retarder may be necessary to protect certain roofing components when high interior humidity is of concern.
A vapor retarder is a material or system that is designed as part of the roof system to substantially reduce the movement of water vapor into the roof system where it can condense.
High interior relative humidity is present.
Carlisle boasts the industry s most comprehensive line of air and vapor barrier products including self adhering sheet membranes spray and roller applied air vapor barriers and fluid applied vapor permeable air barriers.
A hot air welder is used to heat the membrane above and below turning it to plastic and making it moldable.
About air vapor barriers.
Gaf sa vapor retarder is composed of a proprietary formulation of elastomeric styrene butadiene styrene sbs polymer modified bitumen in combination with a high tack self adhesive.
But back in the day multi ply asphalt based vapor retarders that were installed above the roof deck and below the insulation were also acting as very effective air barriers.
Indeed the roofing industry has discussed vapor retarders for decades but only recently focused on air barriers.
Diffusion versus air movement.
The topside is surfaced with high strength tri laminate polyethylene film and the underside is surfaced with protective polyolefin release film that is removed during application.
Options for above and below grade applications are available.
Tpo stands for thermoplastic polyolefin.
Recognize that all vapor retarders are air barriers but not all air barriers are vapor retarders.
Allows for ease of self adhering installation.
