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DESCRIPTION
AIR-SHIELD LM is a single-component, liquid-applied, water-based, polymer-modified air/vapor and liquid moisture barrier. AIR-SHIELD LM cures to form a tough, seamless, elastomeric membrane, which exhibits excellent resistance to air and moisture transmission.
USES
AIR-SHIELD LM has been specifically formulated to act as an air/vapor and liquid moisture barrier within the building envelope. It may be applied to most common surfaces and integrated into various wall systems. AIR-SHIELD LM is suitable for both new construction and restoration.
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SHELF LIFE
Six months in unopened container. Do not store in temperatures over 90° F or below 32° F.
PACKAGING
5 Gallon (18.93 L) Pails
55 Gallons (208.20 L) Drums*
*Available upon special order only
| SPECIFICATIONS |
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| COVERAGE | |
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Application Rate Wet Film Thickness Cured Film Thickness |
20-25 ft²/gal. 60 mil 45 mil (1.15mm) |
PHYSICAL PROPERTIES
| % Solids | 70 |
| Color | Black |
| Flexibility @ -20° F (ASTM D146) 2" mandrel | Pass |
| Elongation (ASTM D-412) | 1500% |
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Water Vapor Permeance 45 mil. dry film (ASTM E-96, Procedure B) |
0.03 Perms |
| Service Temperature | -20°F (-29°C) to 140°F (60°C) |
| Application Temperature | Above 30° F (-1° C) |
| Storage Temperature | 40° F to 90° F (4°C to 30°C) |
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(ABAA Requirement) |
AIR-SHIELD LM |
(ABAA Requirement) |
AIR-SHIELD LM |
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SURFACE PREPARATION
All surfaces must be clean (free of all coatings and curing compounds), structurally sound and relatively smooth. Prepare substrate per manufacturer’s instruction prior to application of membrane.
Exterior Sheathing Panels:
Prior to the application of AIR-SHIELD LM, joints ¼” or greater in exterior sheathing panels [drywall, plywood and oriented strand board (OSB) and glass-faced wall boards, such as DensGlass Gold®] should be taped with a minimum 2" wide contractors mesh style wallboard tape, suitable caulk, such as an acrylic latex, or 4" wide strip of AIR-SHIELD self-adhering air/vapor and liquid moisture barrier. (This method requires the use of MEL-PRIME or MEL-PRIME W/B primer prior to installing AIR-SHIELD strip.)
Details and Protrusions:
Before application of AIR-SHIELD LM, apply a 6” (152 mm) minimum wide strip of AIR-SHIELD self-adhering air/vapor and liquid moisture 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 LM 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 LM may be applied by spraying or a 3/4" minimum nap roller. (For recommendations on spray equipment, consult W.R. MEADOWS technical staff.)
Thoroughly, mechanically mix AIR-SHIELD LM prior to application. AIR-SHIELD LM may be sprayed on at the minimum coverage rate of approximately 20-25 ft²/gal. (60 mils wet) (45 mils dry). Note: For roller applications or during periods of extremely hot weather, two coats (30 mils wet) may be necessary if the material begins to slump. Apply second coat after first coat has completely dried, approximately one to two hours after first coat. 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
Allow material to dry at air and surface temperatures of 30° F (-1° C) or higher. Curing times will be affected by relative humidity, temperature and airflow. The following times are given for average conditions and standard thicknesses. Actual times may differ, depending on specific conditions present on job at time of application. It is recommended that AIR-SHIELD LM be allowed
to air dry to a tack-free film before application of specified
insulation.
Tack free film: 1 hour
Full cure: 48 hours
CLEAN UP
Uncured AIR-SHIELD LM cleans up easily while wet with water. Cured
material is best removed by xylene (xylol) or by mechanical means.
PRECAUTIONS
AIR-SHIELD LM is not designed to perform as a permanently exposed membrane. Keep containers tightly sealed. KEEP FROM FREEZING. Do not apply AIR-SHIELD LM if rainfall is forecast or imminent within 2-4 hours. Do not apply AIR-SHIELD LM when air, material and surface temperatures are expected to fall below 30º F (-1º C) within four hours of completed application.
HEALTH HAZARDS
Keep out of reach of small children. Some people may be allergic
or sensitive to chemicals contained in this product. Do not swallow.
Should adverse effects occur, remove subject from area immediately.
Wash contaminated skin with water and introduce fresh air. Refer
to Material Safety Data Sheet 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 July 2007.
