MasterSeal AWB 665: Vapor permeable, air/water-resistive barrier

(New Product)

MasterSeal AWB 665 description 

MasterSeal AWB 665 is a one component fluid-applied vapor permeable air/ water-resistive barrier based on Silica Fortified Rubber chemistry. This resilient water-resistant coating may be roller-, brush-, spray-applied or jet rolled directly to approved wall substrates. It provides excellent secondary moisture protection to most wall claddings. MasterSeal AWB 665 complies with the air barrier impermeability requirements of the Massachusetts Energy Code.  Limitation: MasterSeal AWB 665 should not be used for below grade applications or on surfaces subject to water immersion.

Recommended uses for the MasterSeal AWB 665 vapor permeable air and water-resistive barrier:

As an air/water-resistive barrier over the following exterior wall substrates:

  • PermaBase® brand cement board or other ASTM C1325 Type A Exterior approved cement boards; ASTM C1177 type sheathings, including DensGlass® exterior sheathing, eXP® sheathing, GlasRoc® sheathing, Securock® glass-mat sheathing, Weather Defense® Platinum sheathing, GreenGlass® sheathing
  • Gypsum sheathing (ASTM C79/C1396); new and untreated Exposure 1 or exterior plywood sheathing (Grade C-D or better)
  • Untreated exposure 1 OSB
  • Poured concrete/unit masonry; poured concrete/unit masonry treated with MasterSeal AWB 600 FL.

MasterSeal AWB 665 provides excellent secondary moisture protection behind many wall claddings including brick, siding, metal panels, EIFS and stucco. (A slip-sheet is required for stucco claddings.)

What are the unique features and benefits of MasterSeal AWB 665?

  • MasterSeal AWB 665 qualifies as both an air/water-resistive barrier and flexible flashing material because it meets ASTM E2357, ICC-ES AC212 and ICC-ES AC148 requirements
  • As a liquid-applied, continuous membrane it eliminates seams, lap joints and staples; transmits wind load directly to the substrate
  • Silica Fortified Rubber technology offers strength, durability and self-sealing properties and require you to apply less material to achieve effective functioning
  • Can be applied at temperature at low as -4 °C (25 °F) when MasterSeal AWB 960 AC is added
  • Applicator friendly, quick applying and fast drying; it can be spray-, roller-, or brush-applied at low wet-film thickness
  • Its textured surface allows sealants, adhesives and spray polyurethane foam to firmly bond to MasterSeal AWB 665

US / Canada Product Information

Data Guide

Data Guide (French)

Data Guide (Spanish)

Brochure - MasterSeal AWB Fire Codes

Brochure - Silica Fortified MasterSeal AWB

LEED Letter

LEED v4 Letter

Details - Application on Masonry Construction

Application Guidelines for Use on Masonry Construction

Details - Application on Framed Construction

Application Guidelines for Use on Framed Construction

Application Guidelines for Spray Application

Application Guidelines for Fastener Self-Sealing

Details - Liquid Flashing Membrane


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)

Direct contact

Master Builders Solutions Technical Support

Construction Systems


Safety Data Sheet (SDS)

Find all available safety data sheets for this product.

Product Certifications

Generate a free certificate of conformance for a specific BASF construction product.

Related Literature

Equipment recommendations for application of MasterSeal AWB air and water-resistive barriers: MasterSeal AWB 665 permeable, air water resistive barrier,

pdf (131.49 Kb)

LEED v4 Letter for MasterSeal AWB 665

pdf (147.85 Kb)

MasterSeal AWB 665 Guide Specifications

doc (203.50 Kb)

MasterSeal AWB 665 LEED Letter

pdf (185.55 Kb)

MasterSeal AWB 665 vapor permeable air and water-resistive barrier that can be applied with an airless sprayer

pdf (114.65 Kb)

MasterSeal AWB Spray Application Guidelines

pdf (104.38 Kb)

MasterSeal AWB on Framed Construction Details

pdf (3.64 Mb)

MasterSeal AWB on Framed Construction Guidelines

pdf (1.02 Mb)

MasterSeal AWB on Masonry Construction

pdf (2.88 Mb)

MasterSeal AWB on Masonry Construction Guidelines

pdf (1.15 Mb)