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DESCRIPTION
AIR-SHIELD LM (ALL SEASON)
is a single component, liquid applied, polymer-modified air/vapor
barrier. AIR-SHIELD LM (ALL SEASON) cures to form a tough, seamless,
elastomeric membrane, which exhibits excellent resistance to air
and moisture transmission.
USES
AIR-SHIELD LM (ALL SEASON) has been specifically formulated to
act as an air/vapor barrier within the building envelope. It may
be applied to most common surfaces and integrated into various
wall systems. The material is suitable for application on new
construction and restoration projects.
FEATURES/BENEFITS
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SHELF LIFE
12 months in unopened container. Do not store in temperatures
over 100º F.
PACKAGING
5 Gallon (18.93 Liter) Pails
55 Gallons (208.20 Liter) Drums**
**Available upon special order only.
SPECIFICATIONS
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PHYSICAL PROPERTIES
| Solids | 65% |
| Color | Black |
| Flexibility @ -20° F (-29° C) (ASTM D146) 2" mandrel | PASS |
| Elongation (ASTM D-412) | >1000% |
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Water Vapor Permeance 45 mil. dry film (ASTM E-96, Procedure B) |
0.06 Perms |
| Service Temperature | -40° F (-40° C) to 140° F (60° C) |
| Application Temperature | Above 10° F (-12° C) |
| Storage Temperature | Below 100° F (38° C) |
| Flash Point | 103° F (39° 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 and dry and free of all coatings
and curing compounds. Do not apply to "green" concrete.
Concrete must be dry and cured a minimum of 14 days prior to application.
Do not apply to polystyrene insulation boards.
Exterior Sheathing Panels:
Prior to the application of AIR-SHIELD LM (ALL SEASON), 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"
(50 mm) wide contractors mesh style wallboard tape. For spray
applications, stapling of the tape to the substrate is recommended.
Details and Protrusions:
Before application of AIR-SHIELD LM (ALL SEASON), 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 LM (ALL SEASON) 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.
SPRAYING APPLICATION
Store material at room temperature or warm material to a minimum
of 50º F (10º C) prior to application. It may be applied by spraying
or by using a 3/4" minimum nap roller. (For recommendations
on spray equipment, consult W. R. MEADOWS technical staff.)
AIR-SHIELD LM (ALL SEASON) may be sprayed on at the minimum coverage rate of approximately 17 -20 sq. ft./gal. (80 mils, wet) (45 mils, dry). Note: Roller applications may require two coats (40 mils wet) to obtain the proper thickness. Apply second coat after first coat has 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.
SPRAYING EQUIPMENT
For detailed information on spray equipment recommendations, use
and clean up, please refer to W. R. MEADOWS technical
bulletin #05-724-A, or the softbound catalog.
CURING & DRYING
Allow material to dry at air and surface temperatures of 10°
F (-12° C) or higher. Curing times will be affected by 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. AIR-SHIELD LM
(ALL SEASON) should be allowed to air dry at least 48 hours before
application of specified insulation. A prime coat of AIR-SHIELD
LM (ALL SEASON) should be allowed to cure until tacky, or beads
of POINTING MASTIC can be used to secure the insulation to the
wall. Polystyrene insulation boards can only be applied if the
membrane is thoroughly cured (72 hrs. minimum), and there is no
danger of residual solvent degrading the boards.
Tack free film: 2 hours
Full cure: 48 hours
COVERAGE
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Application Rate Wet Film Thickness Cured Film Thickness |
17 - 20 sq. ft./gal. 80 mil 45 mil (1.15mm) |
CLEAN UP
Cleans up easily while wet with mineral spirits, paint thinner,
or aromatic solvents. Cured material is best removed with aromatic
solvent or by mechanical means.
PRECAUTIONS
Do not apply indoors. Use with adequate ventilation. No open flames.
Do not apply to polystyrene insulation boards as the solvent
will attack the boards. Do not apply if rainfall is forecast
or imminent within two hours. AIR-SHIELD LM (ALL SEASON) is not
designed to perform as a permanently exposed membrane. Membrane
should be covered within 30 days after application to avoid degradation
caused by UV exposure. Keep containers tightly sealed.
HEALTH & SAFETY
Recommended for outdoor use only. Avoid ignition sources. Avoid
direct contact with product. Product is combustible. Avoid prolonged
breathing of vapors. Utilize appropriate personal protective equipment
including chemical resistant gloves, eye protection, and/or respiratory
protection. Consult product material safety data sheet (MSDS)
for complete health and safety information. Flash point:103º
F (39º C).
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 November, 2005.
