O'Brill Company

Construction Specialty Suppliers

       6626 N. Milwaukee Ave.

Niles, IL 60714

773-775-1122 or 847-647-0005

FAX 847-647-7819

Since 1967

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Sealtight Air-Shield




NO. 718


Provides a complete and tough "above-grade" water, air and vapor barrier on a variety of construction materials.

Technical Description
SEALTIGHT AIR-SHIELD Self-Adhering Air-Barrier and Flashing Membrane is nominally 40 mils thick. The membrane's controlled thickness is fabricated from cross laminated polyethylene bonded to specially modified asphalt.

This unique, self-adhesive membrane, protected by a special release paper, is strong and durable. It remains flexible when surface mounted and will adhere to most primed surfaces even at temperatures down to 25F (-4C). The membrane provides excellent protection as a tough barrier or flashing that won't shrink, sag, dry out, crack or rot. It offers excellent resistance to punctures during installation. The self-healing characteristics of AIR-SHIELD facilitate recovery if damage is sustained.

SEALTIGHT AIR-SHIELD Self-Adhering Air-Barrier and Flashing Membrane is designed for a variety of uses. Besides its air barrier and vaporproofing capabilities, AIR-SHIELD is ideal for numerous concealed flashing applications including parapet, thru-wall at-the-roof, head, window sill, thru-wall at-the-floor, spandrel, doorjamb and frame, foundation and expansion joint. In addition, it is used to protect seams around windows, doors, construction joints and penetrations, etc. Primary applications include cavity wall and masonry wall construction. AIR-SHIELD works equally well as an air or vapor barrier on concrete, masonry (concrete block), gypsum board, styrofoam, plywood, primed steel, aluminum mill finish, anodized aluminum and primed galvanized metal.

Features and Benefits

bulletSelf-healing characteristics facilitate recovery if damage is sustained
bulletProvides complete "above-grade" water and air barrier on a variety of construction materials
bulletRugged membrane can actually fold-to-shape during application as a thru-wall flashing
bulletControlled thickness membrane is ideal for either air barrier or flashing membrane applications.
bulletModified membrane is flexible at low temperatures.
bulletCross laminated polyethylene film has excellent tensile strength, elongation and tear resistance.
bulletExcellent adhesion to prepared substrates of concrete, concrete block, primed steel, aluminum mill finish, anodized aluminum, primed galvanized metal, drywall and plywood.
bulletMembrane resists air, moisture vapor and water.
bulletNo flame required.

Color: White
Thickness: 40 mils (1mm)
Pliability @ -25F (-32C): No effect
Tensile Strength:  
ASTM D 412 (MD, psi): 4,000 Typical
ASTM D 882 (MD, #/in.): 23.5 Min.
Elongation Film:  
ASTM D 412 (MD, %) 400 Typical
ASTM D 882 (MD, %) 400 Min.
Puncture Resistance (# Force): 40 Min.
ASTM E 154  
Water Vapor Transmission (grains/sq. ft./hr.): 0.05 Max.
ASTM E 96  
Water Absorption (% by weight): 0.25 Max.
ASTM D 570  
Application Temperature: 25F (-4C) Min.


AIR-SHIELD is packaged in rolls of 36" (.91m) x 67' (20.42m).

AIR-SHIELD can also be cut to desired width.
Optional sizes include:
4" x 67', 6" x 67', 9" x 67', 12" x 67', 16" x 67'
18" x 67', 20" x 67' and 24" x 67'.

Coverage is approximately 190 sq. ft. (17.7m) when lapped 2" (50mm) on side and end laps.

AIR-SHIELD should be stored palletized and protected from rain and/or physical damage. Do not store at temperatures above 90F (32.2C) for extended periods of time. Do not leave membrane exposed to direct sunlight. Do not double-deck pallets. Store away from sparks or flames. Outdoors, store AIR-SHIELD on pallets and completely cover.

SURFACE PREPARATION: All surfaces to be protected must be clean, dry, frost-free and smooth. Remove any sharp protrusions and repair all defects.

PRIME: All surfaces to which AIR-SHIELD is to be applied must be primed with MEL-PRIME Water-Base or MEL-PRIME Solvent Base VOC Primer. Primer may be applied with a manual sprayer or roller to an area that is to be covered the same day. Uncovered areas must be re-primed the next day. See primer container for complete application, drying information and precautions.

USAGE: AIR-SHIELD will bond to primed concrete, primed wood or metal surfaces, either vertically, or overhead, providing an air-barrier to seal joints.

APPLICATION...Apply membrane to primed surface by removing the release paper and rolling the membrane firmly into place. Insure the membrane is fully adhered and remove all wrinkles and/or fish mouths. Cut the AIR-SHIELD Membrane with a utility knife to detail around protrusions and masonry reinforcing. Seal all end laps and protrusions with SEALTIGHT Pointing Mastic. Overlap subsequent courses of membrane a minimum of 2 inches. Vertical terminations of AIR-SHIELD should either be tied into the wall system or mechanically fastened with the use of SEALTIGHT TERMINATION BAR. When used as a flexible wall flashing, AIR-SHIELD should be recessed a minimum of 1/2" from the exposed face of the wall. Flashing should not be permanently exposed to sunlight. Do not allow the rubberized asphalt surface of the flashing membrane to come in contact with sealants containing solvents, creosote, uncured coal tar products or EPDM.

GENERAL: AIR-SHIELD Self-Adhesive Air-Barrier and Flashing Membrane can be applied at temperatures of 25F (-4C) or higher. Remove the release paper only as the membrane is being applied. AIR-SHIELD is not designed for permanent exposure. Good construction practices call for application of insulation as soon as possible to protect the air barrier and/or flashing.

CLEANUP: Tools, etc. can be cleaned with mineral spirits, paint thinner or aromatic solvent.

No adverse effects expected with normal product use. Cotton work gloves and safety goggles are recommended.

Refer to Material Safety Data Sheet for complete Health and Safety Information.

This material last updated February 2001.

Products for Concrete Performance


W. R. MEADOWS, INC. warrants that, at the time and place we make shipment, our materials will be of good quality and will conform with our published specifications in force on the date of acceptance of the order. THE FOREGOING WARRANTY SHALL BE EXCLUSIVE AND IN LIEU OF ANY OTHER WARRANTY, EXPRESS OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND ALL OTHER WARRANTIES OTHERWISE ARISING BY OPERATION OF LAW, COURSE OF DEALING, CUSTOM OF TRADE OR OTHERWISE. As the exclusive remedy for breach of this Warranty, we will replace defective materials, provided, however, that the buyer examine the materials when received and promptly notify us in writing of any defect before the materials are used or incorporated into a structure. Three (3) months after W. R. MEADOWS, INC. has shipped the materials, all our Warranty and other duties with respect to the quality of the materials delivered shall conclusively be presumed to have been satisfied, all liability therefore terminates, and no action for breach of any such duties may thereafter be commenced. W. R. MEADOWS, INC. shall in no event be liable for consequential damages. Unless otherwise agreed to in writing, no warranty is made with respect to materials not manufactured by W. R. MEADOWS, INC. We cannot warranty or in any way guarantee any particular method of use or application of the performance of materials under any particular condition. Neither this Warranty nor our liability may be extended or amended by our salesmen, distributors or representatives, or by our distributor's representatives, or by any sales information or drawings.

Home Up 1100 - Clear Series 1200 - White 1300 - Clear 1600 - White 164 588 Precision Grout Ceramar Cera-Rod CG-86 Control Joints CS-309-25 CS-309-30 Deck-O-Foam Direct Fire Parking Sealant Duogard Duogard II Evapre Expo-Gloss Fibre Expansion Joint Gardox Hi-Spec Hydraset Hydraset-Free Intralok Lin-Seal Lin-Seal Emulsion Lin-Seal White Liqui-Hard Meadow-Plug Med-Cure Mel-Dek Mel-Drain DB Mel-Gard Melnar Mel-Prime SB VOC Mel-Prime WB Mel-Rol Pac-It Plastic Joint Materials Pourthane Premoulded Membrane Premoulded Tongue and Groove Protection Course PVC Waterstops Red Rosin Paper Rezi-Weld 1000 Rezi-Weld 3-2 Rezi-Weld Gel Paste State Rezi-Weld Gel Paste Rezi-Weld LV Rezi-Weld Rapid Set Roof Traffic Pads Sealex Sealmastic Sealmastic Emulsion Sealtight 1190 Sealtight 158 Sealtight 3405 Sealtight Acry-Lok Sealtight Air-Shield Sealtight CR-90 Sealtight Deck-O-Seal Sealtight Futura-15 Sealtight Kool-Rod Sealtight Meadow-Crete FNP Sealtight Meadow-Crete GPS Sealtight Meadow-Crete H2 Sealtight Meadow-Patch 20 Sealtight Meadow-Patch 5 Sealtight Meadow-Patch T1 Sealtight Meadow-Patch T2 Sealtight Patch-Prime Sealtight Poly-Grip Sealtight Poly-Jet 1614 Sealtight Poly-Jet 200-E Sealtight Poly-Jet 3406 Sealtight Premoulded Membrane Sealtight Rezi-Weld Flex Sealtight Safe-Seal 3405 Sealtight Sealex E-Z Sealtight Ultrite Degreaser Sealtight Seal Cure CS-309-25 Sewer Joint Sof-Seal Tiah Vibraflex Vocomp-20 Vocomp-25 Vocomp-30

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Copyright 2002 O'Brill Company
Last modified: August 09, 2004