Product Data Sheet Show all documents
Sikagard® AWB 660

Sikagard® AWB 660

(formerly MSeal AWB 660)

VAPOR PERMEABLE AIR/WATER-RESISTIVE BARRIER

Sikagard® AWB 660 is a one-component, fluid-applied vapor permeable air/water-resistive barrier. This waterproof, resilient coating may be spray-, roller-, brush-, or trowel- applied directly to approved above-grade wall substrates. It provides excellent secondary moisture protection behind most wall claddings including brick, siding, metal panels, EIFS, and stucco. A slip sheet is required for stucco claddings.

Features Benefits ICC ESR-3209 Evaluation ReportConfirms compliance with IBC, IRC, and IECL requirementsABAA evaluatedApproved for projects requiring ABAA specifications and quality assurance<1% of allowable air leakage per ASTM E2357 Air Leakage of Building Assemblies testEasily meets air tightness requirements defined by ASHRAE 189.1, ASHRAE 90.1, and ABAAMeets ASTM D1970 nail sealability requirements with and without sheathing fabricSelf-sealing performanceOne component, low-VOC formulationEasy to apply, meets VOC requirements in all 50 statesNonflammable as appliedWorkplace safetyMineral oil and plasticizer-freeWill not dry out or crack due to loss of oil/plasticizer over timeWater-basedCleans up with water; solvents and citrus-based cleaners are not requiredTough, abrasion-resistantRugged membrane resists damage after installation180-day outdoor exposure ratingFlexible construction scheduling
Product Data Sheet Show all documents

Usage

For use over the following exterior wall substrates: Poured concrete/unit masonry, poured concrete/unit masonry treated with Sikagard AWB 600 FL or Sika Thorocoat-749 Block Filler, ASTM C1177 type sheathings, including DensGlass™ or DensElementexterior sheathing, eXP™ sheathing, GlasRoc® sheathing, Securock™ glass-mat sheathing, Weather Defense™ Platinum sheathing, GreenGlass® sheathing, PermaBase™ cement-board by National Gypsum and other cement-boards (ASTM C1325 Type A Exterior), untreated Exposure I or exterior plywood sheathing (grade C-D or better), untreated Exposure I OSB, gypsum sheathing (ASTM C79/ASTM C1396), Fire resistive sheathing such as MagTec, LP FlameBlock
Do not use Sikagard® AWB 660 for below-grade applications or on surfaces subject to water immersion

Advantages

Features Benefits ICC ESR-3209 Evaluation ReportConfirms compliance with IBC, IRC, and IECL requirementsABAA evaluatedApproved for projects requiring ABAA specifications and quality assurance<1% of allowable air leakage per ASTM E2357 Air Leakage of Building Assemblies testEasily meets air tightness requirements defined by ASHRAE 189.1, ASHRAE 90.1, and ABAAMeets ASTM D1970 nail sealability requirements with and without sheathing fabricSelf-sealing performanceOne component, low-VOC formulationEasy to apply, meets VOC requirements in all 50 statesNonflammable as appliedWorkplace safetyMineral oil and plasticizer-freeWill not dry out or crack due to loss of oil/plasticizer over timeWater-basedCleans up with water; solvents and citrus-based cleaners are not requiredTough, abrasion-resistantRugged membrane resists damage after installation180-day outdoor exposure ratingFlexible construction scheduling

Packaging

Sikagard® AWB 660: 5-gallon pail (18.9 L) pail

Color

Gray

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

ICC-ES AC 212: Acceptance Criteria for Water-Resistive Coatings used as Water-Resistive Barriers over Exterior Sheathing

ICC-ES AC 148: Acceptance Criteria for Flexible Flashing Materials

Sikagard® AWB 660 complies with the air barrier requirements of the Massachusetts State Energy Code
Product Information

Shelf Life

Sikagard® AWB 660 has a 2 year shelf life when properly stored

Storage Conditions

Store in unopened containers in a clean, dry place to protect liquid system components from freezing. Store at no less than 40 °F (4 °C) and below 120 °F (49 °C). Protect from extreme heat and direct sunlight. Do not stack pallets.

Solid content by mass

74%
Technical Information

Abrasion Resistance

Pull-Off Strength of Coatings

Pass - Min. 110 kPa (15.9 psi) or substrate failure (Tested over exterior gypsum sheathing, ASTM C1177 glass-mat sheathing, cement board, OSB, plywood; pvc and galvanized flashing)

(ASTM D 4541)

Tensile Strength

Tensile Strength after UV Exposure: All samples meet the minimum requirement of 3.5N/mm (20 lbs/in)

(ASTM D 5034, AAMA 711)

Tensile Bond

Tensile Bond: >103 kPa (15 psi) Tested over exterior gypsum sheathing, ASTM C1177 glassmat sheathing, cement board, OSB, plywood, CMU; pvc and galvanized flashing

Tensile Bond (Before and after freeze-thaw): >103 kPa (15 psi) avg; no failure of the lamina after 10 cycles freeze-thaw
(Tested over various substrates)

Adhesion in peel

Tested over ASTM C1177 glass-mat sheathing, OSB, plywood, PVC and uncoated aluminum

After UV ExposurePass
After Accelerated AgingPass
After Elevated Temperature ExposurePass
After Water ImmersionPass

Resistance to Peeling

No signs of distress or failure after 24 hours of exposure at room temperature, 122 °F (50 °C), 149 °F (65 °C), 176 °F (80 °C)

(AAMA 711)

Low Temperature Bend

No cracking after bending around a 25 mm (1") mandrel after 2 hour exposure to 0 °F (-18 °C)

(ASTM D 1970, AAMA 711)

Thermal Resistance

Compound Stability

No flowing, dripping, or drop formation up to 350 °F (177 °C)

(ASTM D 5147 Section 15)

Water retention

Drainage Efficiency

99%

(ASTM E 2273)

Water Penetration under Pressure

Nail Sealability(without Sheathing Fabric)

Pass - No water penetration at galvanized roofing nail penetration under 127 mm (5") head of water after 3 days at 40 °F (4 °C)

(ASTM D 1970)

Nail Sealability after Thermal Cycling: Pass(ASTM D 1970 (Modified),
AAMA 711)

Permeability to Water Vapor

Water Vapour Transmission

18 Perms (grains/Hr. in Hg. ft2) at 10 mils wet film thickness
14 Perms (grains/Hr. in Hg. ft2) at 20 mils wet film thickness

Air permeance

Air Permeance of Building Materials

0.0049 l/s.m2 at 75 Pa (0.00098 cfm/ft2 at 1.57 psf)

Water resistance

No sign of deleterious effects after 14-day exposure (Tested over exterior gypsum sheathing, ASTM C1177 glass-mat sheathing, cement board, OSB, plywood)

(ASTM D 2247)

Hydrostatic Pressure: No water penetration at 55 cm (21.7") water column for 5 hours

(AATCC 127-1985)

UV Exposure

No cracking or bond failure to substrate

(ICC-ES AC 212) and (ICC-ES AC 148)

Behavior after Artificial Weathering

Structural: No cracking at joints or interface of flashing

(ASTM E 1233 Procedure A)

Racking: No cracking at joints or interface of flashing

(ASTM E 72)

Restrained Environmental Conditioning: No cracking at joints or interface of flashing

(ICC-ES AC 212)

Freeze-Thaw Stability

No sign of deleterious effects after 10 cycles (Tested over exterior gypsum sheathing, ASTM C1177 glass-mat sheathing, cement board, OSB, plywood)

(ASTM E 2485 (Method B))

Artificial Ageing

No cracking or bond failure to substrate

(ICC-ES AC 212) and (ICC-ES AC 148)

External Fire Performance

Radiant Heat Multi-Story Tests

Passed using numerous wall assemblies. Engineering analyses are available upon request.

(NFPA 285)

Resistance to fire

Will not add or detract from the rating of a fire-resistive wall assembly

(ASTM E 119/UL 263)

Application

Application Information

Drying Time

40 °F (4 °C) and rising: allow to dry completely, typically 2-10 hours before proceeding with cladding installation.
40 °F (4 °C) down to 25 °F (-4 °C): when applied at a 10-mil wet film thickness, typically dry in approximately 12 hours at
32 °F (0 °C) and 50% relative humidity (RH). When applied at a 20-mil thickness (single pass spray), typically dry in approximately 18 hours at 32 °F (0 °C) and 50% (RH). Allow to dry completely prior to proceeding with cladding installation.
Note: Actual drying time will vary depending on ambient and substrate temperature, humidity, and the ability of the substrate to absorb water. Final air/water-resistive properties and film durability rely on temperatures rising above freezing(32 °F/0 °C).
Consumption

Coverage

ASTM C1177 Type Sheathing:450 ft2 (41 m2) per pail
Cement Board:500 ft2 (46 m2) per pail
Plywood*:265 ft2 (24 m2) per pail

Oriented Strand Board (OSB):265 ft2 (24 m2) per pail
Concrete Masonry Units (CMU)*

  • Standard Weight 265 ft2 (24 m2) per pail
  • Medium Weight 180 ft2 (17 m2) per pail
  • Light Weight 125 ft2 (12 m2) per pail

Poured Concrete*:500 ft2 (46 m2) per pail

Concrete / Masonry with Sikagard® AWB 600 FL: 500 ft2 (46 m2) per pail

Embed Sikagard® AWB 971 FIB

  • 4" Sikagard® AWB 971 FIB: 630 ft (192 m) per pail
  • 6" Sikagard® AWB 971 FIB: 420 ft (128 m) per pail
  • 9" Sikagard® AWB 971 FIB: 280 ft (85 m) per pail

* Roll or spray/backroll for optimum coverage rate. Other application methods may provide less coverage. Actual results may vary depending on surface porosity, roughness, moisture uptake, or other factors.

Note:
Sikagard® AWB 971 FIB saturated with Sikagard® AWB 660, when applied per manufacturer instructions, self-gauges to a 30-40 mil thickness.
Application steps

EQUIPMENT

Use a 20 mm (3/4”) nap roller or paint brush. If spraying, refer to Spray Application of apply Sikagard® AWB 660/ Sikagard® AWB 665/ Sikagard® AWB 600 FL technical bulletin for spray application equipment and application instructions.

Note: If using roller application, it is necessary to pre-wet the synthetic roller pad with water and spin out the excess water. The pre-wetting only needs to be done once at the start of application.

SUBSTRATE PREPARATION

The substrate shall be dry, clean, sound, and free of release agents, paint, or other residue or coatings. Verify that the substrate is flat, free of fins or planar irregularities greater than 6.4 mm in 3 m (1/4” in 10’). Unsatisfactory conditions shall be reported to the general contractor and corrected before the application of Sikagard® AWB 660.

PRODUCT CONSIDERATIONS AND JOB CONDITIONS

  • Cold temperature application less than 40 °F (4 °C) down to 25 °F (-4 °C): expect extended dry time. Final air/water-resistive properties and film durability rely on temperatures rising above freezing (32 °F/0 °C)
  • Do not apply Sikagard® AWB 660 in ambient temperatures below 25 °F (-4 °C) or onto substrates below 25 °F (-4 °C).
  • Walls shall be capped to prevent moisture and precipitation from entering the wall during construction.
  • Treat expansion joints with with Sikalastic® Tape AWB- 970 NP or Sikagard-540 Plus flashing membrane,and provide sufficient slack in Sikalastic® Tape AWB-970 NP or Sikagard-540 Plus at the joint to allow for movement.

MIXING

  1. Use directly from original packaging or prepare in a container that is clean and free of foreign substances. Do not use a container that has contained or been cleaned with a petroleum-based product.
  2. Mix Sikagard® AWB 660 with a clean, rust-free paddle and drill until thoroughly blended. Dilution of Sikagard® AWB 660 is not recommended.
  3. Additives are not permitted.
  4. Close container when not in use.
  5. Clean tools and equipment with water immediately after use. Dried material can only be removed mechanically.

APPLICATION

  1. The substrate shall be of a type acceptable by Sika and shall be installed per substrate manufacturer’s instructions and local code requirements.
  2. Apply Sikagard® AWB 660 and/or apply Sikagard® AWB 900 Liquid Flashing Membrane to fasteners, sheathing joints, and rough openings as outlined in Sikagard® AWB Application Guidelines for Joint Treatment and Flashing Rough Openings on Framed Construction technical bulletin or apply Sikagard® AWB Application Guidelines for Flashing Rough Openings on Concrete and Masonry Construction technical bulletin.
  3. A. Immediately place and center Sikagard® AWB 971 FIB over wet Sikagard® AWB 660 at knot holes and check cracks that may exist in plywood or OSB. Completely saturate Sikagard® AWB 971 FIB with Sikagard® AWB 660.
    B. If using roller, brush, or trowel application, allow to dry to the touch before applying Sikagard® AWB 660 to entire wall surface. If spraying, “wet on wet” application is acceptable.
  4. Refer to Spray Application of Sikagard® AWB 660 / Sikagard® AWB 665/ Sikagard® AWB 600 FL technical bulletin for spray application equipment and application instructions.
  5. A. Apply Sikagard® AWB 660 to DensGlass™ exterior sheathing, eXP™ sheathing, GlasRoc® sheathing, Securock™ glass-mat sheathing, Weather Defense™ Platinum sheathing, GreenGlass® sheathing, PermaBaseTM cement-board by National Gypsum and other cementboards (ASTM C1325 Type A Exterior), gypsum sheathing (ASTM C79/ASTM C1396) and concrete with a 20 mm (3/4”) nap roller, stainless steel trowel, brush or spray gun to a consistent, minimum 10 wet mil thickness that is free of voids and pin holes. A fully loaded roller pad is required to obtain a consistent, minimum 10 wet mil thickness.
    B. Apply Sikagard® AWB 660 at a minimum of 10-mil wet film thickness on concrete/masonry substrates that have received a fully cured application of Sikagard® AWB 600 FL Block Filler. For concrete/masonry substrates that have not been treated with Sikagard® AWB 600 FL Block Filler, two (2) minimum 10-mil applications of Sikagard® AWB 660 are required. Note: Lightweight CMU or other CMU with high porosity may require additional Sikagard® AWB 660 to produce an acceptable result.
    C. Apply Sikagard® AWB 660 to plywood and OSB sheathing using a 20 mm (3/4”) nap roller or spray to a consistent, minimum 10-mil wet film thickness. Visually inspect to determine whether the sheathing surface is fully coated and free of voids and pinholes. Repair as re required to produce a continuous coating. Apply a second 10 ml wet film coat of Sikagard® AWB 660 to produce a total wet film thickness of 20 mils.
    D. Visually inspect the Sikagard® AWB 660 for voids, pinholes, surface deficiencies, etc. Repair deficiencies and areas that are not intact. Apply additional Sikagard® AWB 660 as necessary such that Sikagard® AWB 660 is free of voids, pinholes, etc. All sheathing joints, terminations, inside and outside corners must be reinforced with 4” or 9” Sikalastic® Tape AWB-970 NP or Sikagard-540 Plus.

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