Thermoplastic means that it becomes plastic upon heating and hardens upon cooling and this is how it seals at the seams.
Vapor retarder tpo roofing.
Indeed the roofing industry has discussed vapor retarders for decades but only recently focused on air barriers.
To control moisture a vapor retarder may be necessary to protect certain roofing components when high interior humidity is of concern.
Diffusion versus air movement.
Choosing the right vapor retarder with the new focus on air barriers designers may be quick to add them to roofing systems.
Tpo stands for thermoplastic polyolefin.
High interior relative humidity is present.
A hot air welder is used to heat the membrane above and below turning it to plastic and making it moldable.
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.
Provides temporary weather protection for 90 days provides high tensile strength and puncture resistance.
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.
When vapor drive may be expected to form a dew point under the roof membrane or in the insulation.
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.
Some air barriers are vapor open and allow moisture to escape.
When high interior relative humidity is present.
Typically a vapor retarder has to have a perm rating of 1 0 or less to be successful.
Allows for ease of self adhering installation.
Tri laminate woven polyethylene nonslip uv protected top surface.
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.
Self sealing high quality sbs rubber and asphalt blend.
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.
About air vapor barriers.
Provides low air and vapor permeability.
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.
Recognize that all vapor retarders are air barriers but not all air barriers are vapor retarders.
