The Securock ExoAir 430 System is a high-performance, energy efficient air and water barrier system comprised of the USG’s securock glass-mat sheathing, Tremco’s ExoAir 430 membrane and system accessories. The system accessories contain sealants and transition products that provide a comprehensive air barrier system.

We recommend specifying the Securock ExoAir 430 System in Division 7 "fluid-applied air barriers" because the system utilizes a fluid air/water material applied to glass mat sheathing. The application takes place in a controlled environment as opposed to the field, providing a more consistent membrane application; this high-performance factory fluid-applied system will meet and/or exceed the building performance requirements.

½-inch and 5/8-inch thick gypsum sheathing differ in the core's chemistry. 5/8“ is known as fire-rated and Type X in the industry. Type X designation has been tested by ASTM E 119/UL 263 guidelines. Fire-rated walls are used in interior and exterior spaces for fire propagation. The benefits of 1/2” thick gypsum sheathing are it is more cost effective, lighter to lift, easier to carry and can be installed faster than 5/8-inch.

The Securock ExoAir 430 System is manufactured in a controlled factory environment. This provides consistent mil thickness, no membrane cure time or risk of washout. This system can reduce man-hours and safety risks, and overall improve the schedule efficiency. The approach maintains the performance qualities of a fluid-applied system, while addressing the challenges faced when applying a fluid in the field.

Primer is not required prior to application of ExoAir 120 and ExoAir 220. ExoAir Primer is also generally not required when applying ExoAir 230 unless you are applying it onto metal or transitioning it onto the exposed face of ExoAir 110. ExoAir Primer is required prior to the application of ExoAir 110.

The cure-through of the ExoAir fluids ranges between 24 to 48 hr when evaluated at temperatures between 40 to 90 °F (5 to 32°C) and relative humidity between 50 to 75%. When co-sprayed with calcium chloride solution, ExoAir 120 will require approximately 30 min to become tack-free but 24 hr to achieve full cure.

ExoAir 120: 60 wet mil to achieve 40 dry mil  (25 sq ft/gallon)      
ExoAir 220: 70 wet mil to achieve 40 dry mil (23 sq ft/gallon)
ExoAir 230: 70 wet mil to achieve 35 dry mil (23 sq ft/gallon)
Note: There are 1000 mil in 1” (25.4mm), so 40 dry mil = 0.04” (1mm).

Tremco recommends that fluid-applied ExoAir membranes be applied to surfaces and ambient conditions above 40 ˚F (5 °C). ExoAir fluids should not be applied to surfaces or when ambient conditions are expected to fall and remain below 40 ˚F (5 °C) during the 24 hr immediately following installation.

Yes, all the ExoAir membranes have passed the ASTM tests for nail sealability. The typical nail sealability tests include a smooth roofing nail. Tremco has also tested for nail sealability with a variety of screws and other fasteners. Please refer to the technical bulletin for nail sealability.

Construction gaps in exterior substrates less than 1/16” (1.6 mm) do not require detailing prior to the application of ExoAir fluid-applied membranes. Construction gaps greater than 1/16” (1.6 mm) need to be filled with Dymonic® 100, Tremflex 834 or other approved product. Allow sufficient time for detail work to cure prior to application of ExoAir fluid-applied membranes. 

ExoAir 120 and ExoAir 220 can handle intermittent temperatures of up to 158 ˚F (70 °C). ExoAir 130 and ExoAir 230 can handle intermittent temperatures of up to 240 ˚F (115 °C).

During installation, a standard wet mil thickness gauge is used every 50-100 sq ft to verify thickness. It can also be approximated by staging material. For example, ExoAir 120 is applied at 25 sq ft/gallon and if a 5-gallon pail is being used, approximately 125 sq ft could be installed with one pail of product. By applying the contents of one pail of ExoAir 120 to 125 sq ft of wall area, you attain an average of 60 wet mil thickness over that area.

Allow the ExoAir fluids to cure for a minimum of 2 to 4 days prior to performing adhesion testing. If during this cure period the fluids are exposed to temperatures below 40 ˚F (5 °C), you may have to wait longer in order to achieve a full through cure prior to perform adhesion testing.

ExoAir fluid-applied membranes should be protected from UV exposure and possible site damage from other trades as soon as possible following application. Any prolonged exposure requires an inspection of the membrane in order to evaluate continuity and repair any damage. The following UV exposure periods are acceptable provided the membrane has not been compromised: ExoAir 120 is 30 days, ExoAir 220 is 6 mo, ExoAir 230 is 12 mo. ExoAir 230 may be permanently exposed behind metal panels where the membrane can be seen through the joints in the panels.

12 mo