Product Data Sheet
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Liquid Membrane Vapor Permeable Air Barrier
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. When properly applied as a drainage plane, AIR-SHIELD LMP prohibits liquid water intrusion into the substrate.
A low VOC version of AIR-SHIELD LMP is available for those in low VOC areas.
AIR-SHIELD LMP has been specifically formulated to act as an air and liquid moisture barrier, allowing vapor to pass through it. 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. Primary applications include cavity wall and masonry wall construction. AIR-SHIELD LMP works equally well as an air barrier on precast concrete, cast-in-place concrete, masonry (concrete block), interior and exterior gypsum board, Styrofoam, primed steel, aluminum mill finish, anodized aluminum, primed galvanized metal, drywall, and plywood.
- Non-asphaltic – designed to meet stringent fire code requirements.
- High permeability – allows the transmission of moisture vapor through porous building materials.
- Highly flexible – bridges cracks, which may form in the substrate.
- UV resistant – gray membrane can be left exposed up to six months. Black membrane 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 cleanup.
- 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 – Nails and fasteners can be used without compromising performance.
- Low VOC content. (Extra-low VOC version also available.)
5 Gallon (18.93 Liter) Pails
55 Gallon (208.20 Liter) Drums
Application Rate: 29 ft.2/gal. (0.71 m2/L)
Wet Film Thickness: 55 mil (1.4 mm)
Cured Film Thickness: 30 mil (0.8 mm)
When stored indoors in original, unopened containers at temperatures between 40° – 90° F (4° – 32° C), optimum performance and best use is obtained within one year of date of manufacture.
- Exceeds Air Barrier Association of America (ABAA) requirements for fluid-applied air barriers.
- Exceeds ABAA maximum assembly air leakage requirements when tested in accordance with ASTM E 2357.
- Exceeds ABAA maximum material air leakage requirements when tested in accordance with ASTM E 2178.
- Exceeds the requirements of the Massachusetts Commercial Energy Code for Building Envelope Systems.
- Complies with all current federal, state, and local maximum allowable VOC requirements, including National EPA VOC Emission Standard for Architectural Coatings, CARB, LADCO, and OTC Phase I and II.
|Solids by Volume||55|
(Black – special order only)
|Flexibility @ -26° C (-15° F),||PASS|
|(ASTM C 836):|
|Elongation (ASTM D 412), %:||1300|
|Water Vapor Permeance||>12|
|(ASTM E 96, Procedure B) Perms:|
|Service Temperature:||Not to exceed 175° F
|Nail Sealability (ASTM D 1970):||Pass|
|Storage Temperature||40 – 90° F (4 – 32° C)|
(At Time of Application):
|>20° F (-6.7° C) and rising
Low VOC Version:
>60° F (15.6° C) and rising
|VOC Content:||Standard: 202 g/L
Low VOC Version: 40 g/L
|Test Method||ASTM E 2178||ASTM E 2357|
|ABAA Requirements||0.004 cfm/ft.2 (0.02 L/S/M2)||0.04 cfm/ft.2
|AIR-SHIELD LMP Results||<0.004 cfm/ft.2 (0.02 L/S/M2)||<0.04 cfm/ft.2
AIR-SHIELD LMP conforms with ASTM E 84, Class A.
Surface Preparation … All surfaces must be clean (free of all coatings and curing compounds), free of frost, 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. Prepare substrate per manufacturer’s instruction prior to membrane application.
Exterior Sheathing Panels … Exterior sheathing panels are to be installed and fastened per manufacturer’s recommendation. For detailed application information, see INSTALLATION INSTRUCTIONS: JOINT TREATMENT OF EXTERIOR SHEATHING PANELS WHEN USING AIR-SHIELD FLUID APPLIED MEMBRANES. For joint treatment in plywood and OSB sheathing, please see PLYWOOD SHEATHING JOINT DETAIL INSTALLATION GUIDELINES.
Rough Openings … Refer to INSTALLATION GUIDELINES: AIR-SHIELD ROUGH OPENINGS.
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.
Appearance … AIR-SHIELD LMP (gray) will dry gray in color. AIR-SHIELD LMP (black) appears dark gray in the container, but the dried film will be black.
Temperature/Conditions … Drying (curing) times are dependent on-air temperature, airflow, relative humidity, substrate temperature, wind chill, dew point and etc. For example, as the temperature decreases or the humidity increases, the dry time will increase. If the temperature drops below 40° F (4.5° C), dry time (cure rate) and resistance to precipitation and dew will be delayed. Protect membrane from precipitation and washout prior to drying. Exposure to air temperatures/wind chills below 20° F (-6.6° C) during drying may lead to cracking and decrease of performance of AIR-SHIELD LMP.
Typical Dry Times:
Tack-Free Time: 4 hours at 75° F (23.5° C) & 50% RH
Dry Time: 48 hours at 75° F (23.5° C) & 50% RH
Roller … AIR-SHIELD LMP can be applied directly from the container; a ¾” (19.1 mm) nap roller is recommended. Apply AIR-SHIELD LMP on a vertical surface, in multiple coats if necessary, to achieve a final film thickness of 55 mils wet (30 mils dry). NOTE: While the proper film thickness may be achieved with a single coat, multiple coats may be necessary if the material slumps due to temperature and/or substrate conditions. Allow each previous coat to dry (approximately one hour) prior to applying the next coat.
Sprayer … AIR-SHIELD LMP should be stored and maintained at a temperature of 60˚ F (15.6° C) or higher throughout the entire spray application. Note: Use of Graco HydraMax 350 or Graco GH833 is recommended for optimum performance. A Graco heavy duty texture gun with either a 0.051″ (Graco GHD 551), 0.035″ (Graco GHD 535), or 0.037″ (Graco GHD 537) spray tip is recommended. If cratering occurs, the GHD 535 or 537 is recommended for a smoother finish.
Spray AIR-SHIELD LMP on a vertical surface, in multiple coats if necessary, to achieve a final film thickness of 55 mils wet (30 mils dry). NOTE: While the proper film thickness may be achieved with a single coat, multiple coats may be necessary if the material slumps due to temperature and/or substrate conditions. Allow each previous coat to dry (approximately one hour) prior to applying the next coat.
Film Thickness … Frequently inspect the surface with a wet film gauge to verify that proper film thickness is achieved and that the film thickness is uniform over the entire surface. Porous substrates, masonry blocks, etc., may require multiple coats to achieve recommended film thickness.
Cleanup … Material should not be left in the pump, lines, or gun when finished spraying. After spraying, flush water through the system until pump and hose are clear (approximately five gallons). Aromatic solvents, such as xylene or toluene (approximately two gallons) can be used for final flushing after water is flushed through the pump and lines. Water should be flushed through the machine to remove any solvent prior to spraying of AIR-SHIELD LMP.
DO NOT FREEZE. Keep containers tightly sealed. Maximum UV exposure period for gray membrane is six months; unlimited for black. It is recommended that the roof is installed prior to the application of the AIR-SHIELD LMP. This will help avoid water from getting behind the backup wall or filling the CMU block, which can potentially lead to jobsite concerns. Do not apply AIR-SHIELD LMP if precipitation is forecast or imminent within 24 hours at 75° F (23.5° C) and 50% RH of application. Adhesion of membrane on oriented strand board (OSB) can sometimes be affected by the level of surface texture or the presence of wax that is part of the binder used to bond together the wood strands. Prior to placement on OSB, in-situ adhesion tests should be performed to determine suitability of substrate prior to full installation. If there are variations in the OSB surface, multiple tests may be required.
HEALTH AND SAFETY
Direct contact may result in mild irritation to the skin and eyes. 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. Refer to safety data sheet for complete health and safety information.
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.