MasterSeal AWB: Air and water-resistive barriers (formerly Enershield®)

Creating high performance air and water-resistive barrier systems.  

Four concepts form the basis of MasterSeal AWB:

Efficient use of premium materials

MasterSeal AWB formulations employ high-quality elastomeric polymers that provide a balance of strength, resilience, abrasion-resistance, water-resistance and controlled water vapor permeability.

MasterSeal AWB delivers high performance at low film thicknesses. Low wet-film thickness results in fast drying times, allowing contractors to complete their work quickly, and minimizing potential damage to the membrane before it has fully cured. 

At joints, penetrations and rough openings that need extra strength, special Sheathing Fabric saturated with MasterSeal AWB creates a tough, reinforced composite barrier. MasterSeal AWB 900 elastomeric liquid flashing membrane is also designed to provide exceptional performance in these applications.   

One air barrier material for all wall systems

Designed for use behind all claddings and at rough window treatments, MasterSeal AWB assemblies create a seamless air/water-resistive barrier and flashing system for all walls on your project. Air barriers, by their nature, must be continuous, with flexible and airtight connections to adjacent systems.  The most effective way to maintain a continuous air barrier from a practical perspective is to use one air barrier material for all wall assemblies. This minimizes the need to transition from one air barrier material to another, saving time and eliminating a potential source of air leakage.

Extensive testing to validate performance

Testing performed according to ASTM E2357 Air Leakage of Air Barrier Assemblies has demonstrated that MasterSeal AWB assemblies provide air barrier performance substantially superior to Air Barrier Association of America (ABAA) requirements.

Since most air barriers must also function as water-resistive barriers, MasterSeal AWB assemblies have met the rigorous requirements of the ICC-ES AC 212 Acceptance Criteria for Water-Resistive Coatings used as Water-Resistive Barriers on Exterior Sheathing. The AC 212 test protocol specifies testing that simulates wind and earthquake loading and accelerated aging prior to testing for water penetration. It also evaluates resistance to freeze-thaw cycling and several additional parameters. Products meeting ICC-ES AC 212 requirements can provide superior long-term durability.

With the addition by ICC-ES of the ASTM E 2178 Air Permeance of Building Materials test to AC 212, products that meet AC 212 fulfill the requirements of the International Energy Conservation Code (IECC).

The International Code Council, in partnership with the American Architectural Manufacturing Association (AAMA), defines performance requirements for flexible flashing materials under the AC 148/AAMA 711 Acceptance Criteria for Flexible Flashing Materials. MasterSeal AWB 660, MasterSeal AWB 665 and MasterSeal AWB 660 I reinforced with Sheathing Fabric meet all of the AC 148 requirements, including the modified ASTM D1970 Nail Sealability after Thermal Cycling test.

Taken together, the testing described above validates use MasterSeal AWB 660, MasterSeal AWB 665 and MasterSeal AWB 660 I as single material air/water-resistive barrier assemblies for all wall claddings. Window openings, wall penetrations, sheathing joints and the field of the wall can now work together to provide seamless building protection.

Safety and sustainability

MasterSeal AWB products contribute to jobsite safety in a number of ways, starting with product composition; they are water-based, low-VOC materials. To minimize emissions, MasterSeal AWB products contain just 21 g/L of VOCs for MasterSeal AWB 660 I (less water and exempt solids) or 17 g/l of VOCs for MasterSeal AWB 660/MasterSeal AWB 665 (less water and exempt solids). Both are well below levels typically found in air barrier materials as well as the maximum allowed by the EPA.

As delivered and applied, they are non-flammable.  After they are on the wall and cured, MasterSeal AWB products offer ASTM E-84 Class 1 flame spread performance.

Since MasterSeal AWB products are single-component materials, no mixing is required on the jobsite, and exothermic chemical reactions will not occur.

Prescriptive compliance methods for USGBC's LEED Energy and Atmosphere Prerequisite 2 (Minimum Energy Performance) require air/water-resistive barriers, and are part of an increasing number of state building codes. Studies have shown that air barriers can reduce building energy consumption by up to 40%. In addition, air/water-resistive barriers protect buildings from mold and material decomposition due to moisture within wall systems.

Areas that do not require high strength, for example ASTM C 1177 sheathing, can be effectively coated with MasterSeal AWB. By providing high performance at low coating thickness (10-mils wet film thickness for MasterSeal AWB 660/MasterSeal AWB 665, 26-mils for MasterSeal AWB 660 I), MasterSeal AWB products minimize the environmental burden associated with resource consumption.

Low coating thickness also enables improvements in packaging. BASF supplies MasterSeal AWB products in reusable/recyclable 5-gallon plastic pails. Cleaning and potential disposal of used 55-gallon drums may no longer be required.

MasterSeal AWB Products

MasterSeal AWB 600 FL - (Formerly Enershield FIL) Water based block filler, silica fortified rubber chemistry

MasterSeal AWB 660 I - (Formerly Enershield I) Vapor impermeable, air and water resistive barrier; silica fortified rubber chemistry; class 1 vapor retarder

MasterSeal AWB 660 - (Formerly Enershield HP) Vapor permeable, air and water resistive barrier; silica fortified rubber chemistry

MasterSeal AWB 665 - Vapor permeable, air and water resistive barrier, fluid applied barrier, silica fortified rubber chemistry

MasterSeal AWB 900 - Flashing for air barrier systems

MasterSeal AWB 960 AC - Low temperature additive enables application of MasterSeal air barrier materials at temperatures as low as -4°C (25°F)

MasterSeal AWB 970 FIB - 30-mil thick, self-adhering, self-sealing, composite membrane of polyester fabric and rubberized asphalt

MasterSeal AWB 971 FIB - Reinforced non-woven polyester fabric designed for use with MasterSeal AWB 660, MasterSeal AWB 665, or MasterSeal AWB 660 I

MasterSeal AWB 975 FIB - Premanufactured corner reinforcement designed for use with MasterSeal fluid-applied air and water-resistive barrier systems

NFPA 285 Reports for MasterSeal AWBs - Summaries of various wall assemblies that meet the requirements of NFPA 285

MasterSeal AWB / extruded polystyrene / expanded polystyrene / Neopor GPS Plus rigid insulation board / non-combustible cladding

MasterSeal AWB / Hunter Xci Class A polyisocyanurate / non-combustible cladding

MasterSeal AWB / BASF Wall Systems EIFS

MasterSeal AWB / Atlas EnergyShield Pro or EnergyShield Pro 2 / metal composite material

MasterSeal AWB / Atlas EnergyShield Pro or EnergyShield Pro 2 / various veneers

MasterSeal AWB / various insulations / ASTM C929 Stucco (3/4")

MasterSeal AWB / non-combustible veneers

MasterSeal AWB / Hunter Xci Ply / various claddings

MasterSeal AWB / Hunter Polyisocyanurate / MCM/ACM

MasterSeal AWB / mineral wool insulation / non-combustible veneers or MCMs

MasterSeal AWB / various insulations / stuccobase (min 1/2" thick)

MasterSeal AWB / metal composite material (MCM)