Product Data, W. R. MEADOWS
07 27 26
No. 724-B
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AIR-SHIELD™ LMP
Liquid Membrane Vapor Permeable Air Barrier

DESCRIPTION
AIR-SHIELD LMP is a water-based air/liquid moisture barrier that cures to form a tough, seamless, elastomeric membrane. AIR-SHIELD LMP exhibits excellent resistance to air leakage. As a drainage plane, AIR-SHIELD LMP prohibits liquid water intrusion into the substrate, if properly applied.

USE
AIR-SHIELD LMP has been specifically formulated to act as an air and liquid moisture barrier, allowing vapor to pass through it while being impermeable to liquid water. It may be applied to most common surfaces and integrated into various wall systems. AIR-SHIELD LMP is suitable for both new construction and retrofit applications.

SPECIFICATIONS
• Exceeds Air Barrier Association of America (ABAA) Section 07263 Liquid-Applied Vapor Permeable Air Barrier System.
• Exceeds therequirements of the Massachusetts Commercial Energy Code For Building Envelope Systems.
• 2005 National Building Code of Canada.

FEATURES/BENEFITS
  • HIGH PERMEABILITY - allows the transmission of moisture vapor through porous building materials.
  • HIGHLY FLEXIBLE - bridges cracks, which may form in the substrate.
  • UV RESISTANT – grey can be left exposed up to six months. Black can be exposed for an indefinite period and is ideal for exposed applications, such as beneath rain screen panels.
  • USER FRIENDLY – single-component, water-based technology allows for simple, safe application and easy clean up.
  • LIQUID APPLIED - simplifies detailing and assures a monolithic, seamless membrane when applied to a rough or smooth surface.
  • SPRAYABLE - with appropriately configured airless spray equipment - low application costs.
  • EXCELLENT ADHESION - remains firmly bonded to the substrate, even when applied over damp surfaces.
  • SELF-SEALING – allows for faster application after membrane is installed.
  • LOW VOC CONTENT – less than 100 g/L.

SHELF LIFE
12 months in unopened container. Do not store in temperatures over 90° F or below 40° F.

PACKAGING
5 Gallon (18.93 Liter) Pails
55 Gallon (208 Liter) Drums

PHYSICAL PROPERTIES
Solids Content
Color
 58% (approx)
Grey (Black – special order only)
Flexibility @ -20° C (-26° C) (ASTM C836)
Tensile Strength
Elongation (ASTM D 412)
Water Vapor Permeance (ASTM E-96, Procedure B)		 PASS
100 PSI
1200%
12 Perms
Service Temperature
Nail Sealability (ASTM 1970)
Application Temperature
Storage Temperature		 Not to exceed 175° F (80° C)
Pass
Above 40° F (4° C)
40° F to 90° F (4° C to 30° C)

*Air Leakage (Tested per ASTM E 2178-01)
Pressure Air Leakage
(ABAA requirement)		 Results for
AIR-SHIELD LMP 		Air Leakage
(ABAA requirement)		 Results for
AIR-SHIELD LMP
Pa lbs./ sq. ft. L/sM² L/sM² cfm/sq. ft. cfm/sq. ft.
75 1.57 0.02 Less than 0.02 0.004 Less than 0.004

* Independent tests available upon request.

SURFACE PREPARATION
All surfaces must be clean (free of all coatings and curing compounds), structurally sound and relatively smooth. AIR-SHIELD LMP can be applied to “green” or damp concrete if there is no liquid water on the surface.

Exterior Sheathing Panels:
Prior to the application of AIR-SHIELD LMP, joints ¼” wide or greater between exterior sheathing panels and between exterior sheathing panels and dissimilar materials should be either pre-treated with a minimum 4" strip of AIR-SHIELD membrane or filled with a compatible sealant, such as an acrylic latex, prior to installation of AIR-SHIELD LMP.

Details and Protrusions:
Before application of AIR-SHIELD LMP, apply a 6” (152 mm) minimum wide strip of AIR-SHIELD self-adhering air barrier where joints between dissimilar building materials occur, i.e. details around doors and windows, as well as protrusions. Architectural details are available online at www.wrmeadows.com or by calling 1-800-342-5976.

Concrete Masonry Units:
Before applying AIR-SHIELD LMP to CMU surfaces, patch all cracks, protrusions, small voids, offsets, details, irregularities and small deformities with MEADOW-PATCH® 5 or MEADOW-PATCH 20 from W.R. MEADOWS at least two hours before application.

APPLICATION
AIR-SHIELD LMP may be applied by spraying or roller. (For recommendations on spray equipment, consult W.R. MEADOWS technical staff.) AIR-SHIELD LMP may be sprayed on at the minimum coverage rate of approximately 16-20 sq. ft./gal. (90 mils, wet) (45 mils, dry). Frequently inspect surface area with a wet mil gauge to ensure consistent thickness. Work material well into any fluted rib forming indentations. Porous masonry block walls may require additional coats to obtain desired thickness.

CURING & DRYING
Apply at air and surface temperatures of 40° F (4° C) or higher. Curing times will be affected by relative humidity, temperature and airflow. The following times are given for average conditions and standard thickness. Actual times may differ, depending on specific conditions present on job at time of application. It is recommended that AIR-SHIELD LMP be allowed to cure before application of specified insulation.

Tack-free film: 2 hours
Full cure: 48 hours

COVERAGE
Application Rate
Wet Film Thickness
Cured Film Thickness		 16-20 sq. ft./gal.
90 mil (2.3 mm)
45 mil (1.15 mm)

CLEAN-UP
Uncured AIR-SHIELD LMP cleans up easily while wet with water. Cured material is best removed by Xylene (Xylol) or by mechanical means.

PRECAUTIONS AND LIMITATIONS
Keep containers tightly sealed. KEEP FROM FREEZING.

Maximum UV exposure period for grey material is 6 months, unlimited for black.

Do not apply AIR-SHIELD LMP if rainfall is forecast or imminent within 12 hours.

Do not apply AIR-SHIELD LMP when air, material and surface temperatures are expected to fall below 32º F (0º C) within 24 hours of completed application.

HEALTH HAZARDS
Direct contact may result in mild irritation to the eyes and skin. Should adverse effects occur, remove subject from area immediately. If irritation occurs and persists, move victim from exposure source and treat symptomatically. Flush affected areas with mild soap and water. Consult product Material Safety Data Sheet (MSDS) for complete health and safety information.

TECHNICAL ASSISTANCE
Please contact W. R. MEADOWS for specific details and/or data not outlined in this literature. Technical assistance, from design to product application, is available upon request.

This material last updated March 2007.

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