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DESCRIPTION
AIR-SHIELD LM (ALL SEASON) is a single-component,
liquid-applied, polymer-modified
air/vapor and liquid moisture 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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PACKAGING
5 Gallon (18.93 Liter) Pails
55 Gallons (208.20 Liter) Drums**
**Available upon special order only.
SHELF LIFE (TYPICAL)
Twelve (12) months in unopened container. Do not store in
temperatures over 100° F.
| SPECIFICATIONS |
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| LEED INFORMATION May help contribute to LEED credits: |
PHYSICAL PROPERTIES
| Solids, % | 65 | WRM Test Method |
| Color | Black | Visual |
| Flexibility @ -20° F, 2" mandrel | PASS | ASTM D 146 |
| Elongation | >1000% | ASTM D 412 |
| Water Vapor Permeance | 0.06 Perms | ASTM D 96 (Procedure B) |
| Service Temperature | -40° F to 140° F (40° to- 60° C) | |
| Application Temperature | Above 10° F (-12° C) | |
| Storage Temperature | 60-100° F | |
| Flash Point | 103° F | ASTM D 93 |
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(ABAA Requirement) |
AIR-SHIELD LM (ALL SEASON) |
(ABAA Requirement) |
AIR-SHIELD LM (ALL SEASON) |
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SURFACE PREPARATION
All surfaces must be clean, dry, and structurally sound.
Surfaces must be free of any curing compounds, coatings,
release agents, and frost.
Concrete must be a minimum of 14 days old prior to application of AIR-SHIELD LM (ALL SEASON). Do not apply to fresh or “green” concrete.
Do not apply to polystyrene insulation boards.
Exterior Sheathing Panels … Exterior sheathing panels are to be fastened per manufacturer’s recommendation. Fill all panel joints with AIR-SHIELD JOINT FILLER from W. R. MEADOWS prior to full application. Joints >¼” in exterior sheathing panels [drywall, plywood, oriented strand board (OSB), and glass-faced wallboards, such as DensGlass Gold®] should be filled with AIR-SHIELD JOINT FILLER and then taped with a minimum 2” wide contractors mesh-style wallboard tape. Follow exterior sheathing manufacturers’ recommendation when installing and fastening sheathing.
Details and Protrusions … Before application of AIR-SHIELD LM (ALL SEASON), apply a 6” (152 mm) minimum wide strip (lapped 3” on each side) of AIR-SHIELD where joints between dissimilar building materials occur (i.e., details around doors and windows, as well as protrusions). Architectural details are available 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.
SPRAYER APPLICATION
Store material at room temperature or warm material to a minimum of 60° F 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) must be a minimum of 60° F (15° C) prior to spraying. Product will become very thick and difficult to spray at lower temperatures. AIR-SHIELD LM (ALL SEASON) must be stored in a heated trailer and/or passed through a heat exchanger for successful spraying.
Equipment … AIR-SHIELD LM (ALL SEASON) is most effectively and efficiently applied by using either the Graco HydraMax 350 or GH 833 Big Rig sprayer.
The Graco heavy duty texture gun with the 0.035” (GHD 535) heavy duty switch tip is recommended for best results. For detailed information on spray equipment recommendations, use, and cleanup, please refer to W. R. MEADOWS technical bulletin #05-724-A, available on the building envelope page of www.wrmeadows.com or in the softbound catalog.
AIR-SHIELD LM (ALL SEASON) may be sprayed on at the minimum coverage rate of approximately 17 -20 ft.²/gal. to achieve 80 mils wet (2.03 mm) wet, 45 mils (1.14 mm) dry. Two coats may be required to achieve desired thickness in hot weather. Note: Roller applications may require two coats (each 40 mils wet) to obtain the proper thickness. Apply second coat after first coat has dried, approximately 1 - 2 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
10° F (-12° C) or higher. The following times are given
for typical conditions and standard thickness. Actual
times may differ depending on specific conditions
present on job at time of application, such as
temperature, humidity, airflow, etc. AIR-SHIELD LM
(ALL SEASON) should be allowed to air dry at least 48
hours before application of specified insulation. Beads
of POINTING MASTIC from W. R. MEADOWS 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 (typical)
Full cure: 48 hours (typical)
| COVERAGE | |
|
Application Rate Wet Film Thickness Cured Film Thickness |
17 - 20 ft.²/gal. 80 mil 45 mil (1.15mm) |
Coverage dependant on substrate type, weather, and application and jobsite conditions.
CLEAN UP
Material should not be left in the pump, lines or gun
when finished spraying. Aromatic solvents, such as
xylene and toluene, should be flushed through the
sprayer until the pump and hose run clear.
CAUTION: A final flush of the spraying equipment, with water, must be completed to remove any traces of solvent prior to spraying a water-based product. The presence of any residual solvent will cause the water-based product to solidify and clog the pump and hose.
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 AND SAFETY
EXTERIOR USE ONLY. AVOID IGNITION
SOURCES. AVOID PROLONGED
BREATHING OF VAPORS. Use proper
personal protective equipment, including
chemical resistant gloves and eye and respiratory
protection. Keep out of reach of children. Do not
swallow. Should adverse effects occur, remove
subject from area immediately. Refer to Material
Safety Data Sheet for complete health and safety
information. Flash point is 103° F (39° 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 2009.
