High-Performance Air and Moisture Barrier for Building Construction
ASI 52AB is a high-performance fluid applied air barrier designed to protect buildings from uncontrolled air movement and moisture penetration. This advanced fluid applied air barrier uses silyl-terminated polyther (STPE) technology to create a durable, seamless protective membrane.
This single-component air and moisture barrier provides reliable protection for exterior walls, roofing, siding and other construction applications. Its excellent adhesion, water resistance and weatherability make it suitable for protecting the building in demanding conditions.
Unlike conventional water-based coatings, ASI 52AB bonds to damp or wet substrates without bubbling or outgassing, helping contractors maintain progress when weather conditions are unpredictable.
Advanced STPE Air Barrier Technology
ASI 52AB uses hybrid polymer technology to deliver flexibility, adhesion and durability. As a liquid applied air barrier, it forms a continuous elastomeric membrane that conforms to joints, penetrations and minor surface imperfections.
Its 100% solids formulation prevents shrinkage and cracking during curing, maintaining a seamless protective layer across compatible surfaces.
Key advantages include:
Continuous protection against unwanted air movement
Excellent adhesion to common construction materials
Flexible membrane that accommodates substrate movement
Reliable sealing around joints and penetrations
Long-term resistance to UV exposure and weathering
Water Resistance and Weather Protection
ASI 52AB is designed for challenging construction conditions, offering excellent water resistance before and after curing.
Unlike conventional coatings that may wash away in the rain, this fluid applied membrane stays in place when wet weather is expect.
Its formulation provides excellent UV resistance, having passed 4,000 hours of QUV testing.
The coating creates a continuous weather resistive barrier against unwanted moisture intrusion, helping prevent moisture penetration across suitable exterior surfaces.
This makes ASI 52AB particularly useful for construction projects where changing weather conditions can affect installation schedules.
Breathable Membrane and Moisture Control
Effective moisture control is essential for protecting building materials and maintaining long-term performance.
ASI 52AB functions as a permeable air barrier, combining resistance to liquid water with excellent vapor permeability.
With a vapor transmission rating of 20 perms at 25 mils, the air barrier membrane allows damp substrates to dry while helping prevent external moisture intrusion.
This makes ASI 52AB suitable for applications requiring a vapor permeable air barrier, rather than a vapor impermeable barrier designed to restrict water vapor movement.
For comparison, some vapor barrier materials have permeability ratings of 0.1 perms or lower. ASI 52AB's higher permeability allows water vapor to pass through the membrane, supporting drying with compatible wall systems.
When selecting an air and vapor barrier, contractors should consider the complete wall assembly, local climate and intended moisture management strategy. This is particularly important in cold climates, where temperature differences can influence condensation risks.
ASI 52AB supports breathable construction while helping reduce the risk of trapped moisture with compatible building systems.
Building and Waterproofing Applications
ASI 52AB is suitable for a wide range of construction applications, providing durable protection across different surfaces.
Common applications include:
Exterior walls: Continuous air and moisture protections
Roofing: Flexible waterproofing for compatible surfaces
Liquid flashing: Protecting penetrations and transitions
Siding: Support weather sealing around connections
Gypsum sheathing: Coating suitable sheathing surfaces
Panel installation: Sealing joints and vulnerable connections
General industrial: Flexible coating and sealing applications
Its excellent adhesion helps maintain membrane continuity across different materials, supporting effective building protection and air water management.
With a complete wall system, proper detailing around wall cavities, penetrations and transitions is essential to maintaining a continuous barrier. ASI 52AB can contribute to an effective building enclosure when used alongside compatible materials.
Compatible Construction Substrates
ASI 52AB provides excellent unprimed adhesion to numerous construction materials, making it suitable for projects involving multiple substrates.
Compatible surfaces include:
Steel and galvanized metal
Aluminum and painted metal
Ceramic and glass
Fiberglass and wood
Concrete, brick and mortar
Certain plastics
Substrate compatibility and preparation should be confirmed before installation to ensure reliable adhesion and long-term performance.
Flexible Performance and Durability
ASI 52AB combines excellent physical properties with resistance to demanding environmental conditions.
Its elastomeric formulation delivers 500% elongation at break, allowing the cured membrane to accommodate movement.
Additional technical properties include:
Tensile strength or 122 psi
Hardness of 25 Shore A
Viscosity of 40,000 cps
Service temperature range of -50°F to 220°F
Intermittent temperature resistance up to 270°F
Approximately 60-minute skin formation time
Water vapor transmission of 20 perms at 25 mils
These characteristics support reliable performance across demanding construction applications.
Low-Odor and VOC-Compliant Formulation
ASI 52AB contains no solvents, phthalates or isocyanates, providing a low-odor solution for construction projects.
Its VOC content is 16 grams per liter under ASTM D2369, meeting relevant CARB and SCAQMD requirements.
The product also conforms to California Proposition 65 and meets USDA requirements for non-food-contact applications.
Easy Application and Packaging
ASI 52AB is a single-component, moisture-cure coating that requires no mixing before application.
The recommended application temperature range is 32°F to 150°F, although lower temperatures and humidity may extend curing times. ASI 52AB can be applied using a roller or spray equipment.
Proper installation is essential for achieving consistent performance. Contractors should follow manufacturer guidance, consider relevant building codes and apply appropriate building science principles when designing air barrier systems.
When comparing air barrier products, installation methods should also be considered. For spray applied applications, contractors should confirm suitable equipment and procedures with Meridian Adhesives (Or American Sealants Inc.).
Strength develops after application and continues increasing over approximately seven days.
Available packaging includes cartridges, pails an drums.
A Reliable Fluid Applied Air Barrier Solution
ASI 52AB provides dependable air and moisture protection through advanced STPE technology, excellent adhesion and long-term durability.
Its ability to bond to wet surfaces helps on demanding construction sites. It can withstand harsh weather and maintain a seamless membrane.
For projects requiring a breathable, flexible and weather-resistant air barrier, ASI 52AB supports effective moisture management and lasting building protection.
Discover More About ASI 52AB
Learn more about the launch of ASI 52AB and how its advanced STPE technology delivers reliable air and moisture protection in challenging construction conditions. Read the ASI 52AB product launch announcement for further details.
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