DEFENDAIR™ 200C Air and Weather Barrier Coating

What is DEFENDAIR™ 200C Air and Weather Barrier Coating?

A 100% silicone liquid applied Air and Weather Barrier designed to protect against air infiltration and water penetration. The vapor permeable, one component, water-based coating cures to form a flexible membrane that is impervious to water but has the ability to “breathe,” allowing water vapor to escape from inside the substrate.

Uses

Strong adhesion strength to common wall substrates, including:

DensGlass
Concrete masonry units (CMU)
Oriented Strand Board (OSB)
Plywood
Exterior Sheathing
Preformed Panels
Steel stud walls
Rainscreens

Benefits

Airtight performance that exceeds industry standards
Passes NFPA 285 assembly testing
Improved shelf life
Aesthetically pleasing charcoal gray color
Reduced appearance of dirt pickup
Improved energy efficiency and durability
Can be applied at temperatures as low as 20°F (-6°C)
Long-term UV resistance and enhanced weatherproofing
Water-based, low-VOC formulation
Vapor-permeable and breathable
One-coat spray application; may also be roller applied
Primerless adhesion to even the most challenging construction substrates
Complete offering of compatible accessory materials

Man spraying AirBarrier system, DefendAir, on a wall outside. From Mark Boardman video for Build A Better System

DOWSIL™ Silicone Air Barrier System offers better building performance

Learn how you can protect buildings from air, water and vapor with compatible barrier applications. Whether meeting regulatory requirements for energy efficiency or enhancing weatherability, Dow barriers meet the need for high-performance building design.

WATCH VIDEO

Dow partners with BIMsmith to create data-rich digital models of Dow products, seamlessly integrating with BIM design software and Autodesk Revit, the top architectural design tool.

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Properties

Application Benefits
Resistance Type	Ozone Resistance, UV Resistance, Water Resistance

Typical Properties
Adhesion to	Concrete, OBS/Sheathing, Preformed Panels, Plywood, Wood or Steel Stud Walls (typically unprimed)
Color	Charcoal Gray
Elongation	650 %
Shelf Life	360 Days
Solventless	true
Technology	Solventless
Volatile Organic Content	< 19 g/liter