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  • ExoAir 230/230LT Application
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ExoAir® 230/230LT

Fluid-Applied, Synthetic Air & Vapor Permeable Membrane

ExoAir® 230/230LT Fluid-Applied Synthetic Permeable Air Barrier Membrane is a monolithic, elastomeric membrane designed to be rolled or sprayed onto exterior above-grade wall assemblies to mitigate air infiltration/exfiltration and water penetration while remaining permeable to the passage of water vapor.


Basic Uses
  • ExoAir 230/230LT is typically applied to exterior sheathing panels, concrete block, poured concrete or wood substrates as an air and vapor barrier material.
  • ExoAir 230/230LT can be used with ExoAir 110, ExoAir 110AT, ExoAir 230/230LT with mesh as fluid-applied flashing or Dymonic® 100 liquid flashing to detail into the rough opening.
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Product Details, Safety, and Installation
  • What is the high service temperature limit for ExoAir fluids?

    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).

  • Is a primer needed?

    Primer is not required prior to application of ExoAir 120/220. ExoAir Primer is also generally not required when applying ExoAir 230/230LT 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.

  • What are the cure times for ExoAir fluid-applied membranes?

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

  • What are the recommended minimum application thicknesses for ExoAir fluid-applied membranes (wet and dry mils) and the coverage rate at that thickness?

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

  • What is the low temperature application limit for ExoAir fluids?

    The ExoAir 230 membrane should be applied to surfaces and ambient conditions above 40˚F (5°C). ExoAir 230 should not be applied to surfaces or when ambient conditions are expected to fall and remain below 40˚F (5°C). The ExoAir 230LT membrane should be applied to surface conditions above 20˚F (-6°C). ExoAir 230LT should not be applied to surfaces or when ambient conditions are expected to fall and remain below 20˚F (-6°C) during the 24 hours immediately following installation.

  • Are ExoAir membranes self-gasketing?

    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.

  • How are construction gaps detailed prior to the application of ExoAir fluid-applied membranes?

    Construction gaps in exterior substrates less than 1/16” (1.6mm) do not require detailing prior to the application of ExoAir fluid-applied membranes. Construction gaps greater than 1/16” (1.6mm) 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

  • How is mil thickness verified?

    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 mils thickness over that area.

  • How long should ExoAir fluids cure through prior to performing adhesion testing?

    Allow the ExoAir fluids to cure for a minimum of 2-4 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.

  • What is the maximum time that ExoAir membranes can be left exposed to UV?

    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 – 30 days, ExoAir 220 – 6 months, ExoAir 230 and 130 – 12 months. 

  • What is the shelf life of ExoAir fluid-applied air barrier membranes? products?

    12 months.

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