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Build a Better Barrier™

DOWSIL™ Silicone Air Barrier System offers better building performance

High-performance buildings demand exceptional protection. Design with confidence using the DOWSIL™ Silicone Air Barrier System – a variety of silicone technologies that help you build a better barrier to protect the building envelope from air, water and vapor in both renovation and new construction.

A cross-section of a building wall showing the installation of Dow Corning® DefendAir 200

The system’s key benefits include:

  • Improved energy efficiency and durability
  • Airtight performance that exceeds industry standards across a wide range of temperatures 
  • Long-term UV resistance and enhanced weatherproofing
  • Water-based, low-VOC formulation 
  • Vapor-permeable and breathable
  • Primerless adhesion to even the most challenging construction substrates

The DOWSIL™ Silicone Air Barrier System’s complete offering of compatible accessory materials includes:
 

DEFENDAIR™ 200C Air and Weather Barrier Coating, a 100 percent silicone liquid-applied air and weather barrier designed to protect against uncontrolled air infiltration and water penetration.

DEFENDAIR™ 200 Primer, a water-based silicone adhesion promoter developed to improve the adhesion of DEFENDAIR™ 200C Air and Weather Barrier Coating.

DOWSIL™ Silicone Transition System (STS) a preformed silicone strip and molded pieces designed for flashing and transition applications to weatherproof against air and water infiltration.

DOWSIL™ Silicone Transition Strips and DOWSIL™ Silicone Transition Corners, high-performance, precured, 100 percent silicone rubber strips and corners designed to simplify installation and ensure continuous airtight transition from the window to the wall.

DOWSIL™ 758 Silicone Weather Barrier Sealant, a neutral, one-part silicone sealant designed to adhere to even the most demanding substrates without a primer.

DOWSIL™ 791 Silicone Weatherproofing Sealant, a one-part, medium-modulus, neutral-curing silicone sealant for general weathersealing applications that is optimal for adhering STS to DEFENDAIR™ 200C Air and Weather Barrier Coating.

DOWSIL™ 778 Silicone Liquid Flashing, a one-part, liquid silicone flashing that can be trowel-applied to weatherproof at window and door openings and other through-cavity penetrations.


Explore our resources to learn what gives the DOWSIL™ Silicone Air Barrier System the potential to outperform current air barrier industry standards.

Quick Links

Build a Better Barrier
Receive additional information regarding our air barrier products.

Air Barrier Technical Drawings
List of drawings for air barrier system products.

Air Barrier Contractor Handbook
Guide to installing and field testing: Air Barrier System Products.