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  1. Home
  2. Building, Construction and Infrastructure
  3. Sustainable Building Envelope
  4. Build a Better Barrier™

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 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

DOWSIL Silicone Air Barrier System offers better building performance

Learn more about a compatible system that protects buildings from air, water and vapor

 

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.

  • DOWSIL™ Silicone Air Barrier System full literature Guide outlines typical properties, system components, application methods and quality control; includes detailed illustrations of product in different applications.
  • Air Barrier System Overview provides descriptions of the parts and products of the system and the benefits it can provide for your project such as airtightness, temperature flexibility and UV resistance.
  • DEFENDAIR™ 200C Air and Weather Barrier Coating Application Guide provides installation and field testing guidance.
  • DOWSIL™ Silicone Transition System Application Guide includes in-shop and field installation instructions with illustrations.
  • Air Barrier Drawing Details offers detailed illustrations of product in different applications.
  • Air Barrier Tech Talks covers topics about DEFENDAIR™ 200C Air and Weather Barrier Coating absorption rates on various substrates, on damp substrates and in rain, material thickness, certified applicators, warranty and tinting to medium gray.
  • DOWSIL™ Air Barrier Coatings Specification, Section 07 27 29 guide specification section has been prepared to assist you in incorporating DOWSIL™ products into construction project specifications (PDF or Word).