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	SECTION 07270
	AIR BARRIERS
	** NOTE TO SPECIFIER ** W.R. Meadows, 1nc.; Air Barriers. . This section is based on the products of W.R. Meadows, Inc, which is located at: 300 Industrial Drive P.O. Box 338 Hampshire, IL 60140-0338 Te1: (800) 342-5976 Fax: (847) 683-4544 Email: wrmil@wrmeadows.com www.wrmeadows.com . Since, 1926, W. R. MEADOWS, INC. has built a coveted reputation for product quality, company integrity and service among architects, engineers, and contractors in both the private and public sectors of the construction industry. Our broad SEALTIGHT line of high performance, premium grade construction products has been developed for use in . . . on . . . around and under concrete.SEALTIGHT Products are manufactured to comply with the exacting and rigid engineering and governmental specification standards of today's demanding construction industry. In application, contractor-proven SEALTIGHT Products are specifically designed to enhance the aesthetic qualities and functional capabilities of every square foot of concrete you place.Products are available promptly worldwide through our North American and International network of trained SEALTIGHT Distributors. Products are in stock and ready for shipment from any of our nine strategically located facilities serving the construction industry throughout the United States and Canada.. .
	PART 1	GENERAL
	1.1	SECTION INCLUDES
	** NOTE TO SPECIFIER ** Delete items below not required for project.
		A.	Air Barriers.
	1.2	RELATED SECTIONS
	** NOTE TO SPECIFIER ** Delete any sections below not relevant to this project; add others as required.
		A.	Section 04050 - Basic Masonry Materials and Methods.
		B.	Section 07200 - Thermal Protection.
		C.	Section 07500 - Membrane Roofing.
		D.	Section 07700 - Roof Specialties and Accessories.
		E.	Section 07800 - Fire and Smoke Protection.
		F.	Section 07900 - Joint Sealers.
		G.	Section 08050 - Basic Door and Window Materials and Methods.
		H.	Section 08500 - Window Frames.
		I.	Section 09200 - Plaster and Gypsum Board.
	1.3	REFERENCES
	** NOTE TO SPECIFIER ** Delete references from the list below that are not actually required by the text of the edited section.
		A.	ASTM D 146-97 - Standard Test Methods for Sampling and Testing Bitumen-Saturated Felts and Fabrics Used in Roofing and Waterproofing; 1997.
		B.	ASTM D 412 - Standard Test Methods for Vulcanized Rubber and Thermoplastic Rubbers and Thermoplastic Elastomers-Tension; 1998.
		C.	ASTM D 570-98 - Standard Test Method for Water Absorption of Plastics; 2005.
		D.	ASTM D 882 - Standard Test Method for Tensile Properties of Thin Plastic Sheeting; 2001.
		E.	ASTM D 1970 - Standard Specification for Self-Adhering Polymer Modified Bituminous Sheet Materials Used as Steep Roofing Underlayment for Ice Dam Protection; 2001.
		F.	ASTM D 903 - Standard Test Method for Peel or Stripping Strength of Adhesive Bonds; 2004.
		G.	ASTM E 96-00e1 (Method B) - Standard Test Methods for Water Vapor Transmission of Materials; 2000.
		H.	ASTM E 154 - Standard Test Methods for Water Vapor Retarders Used in Contact with Earth Under Concrete Slabs, on Walls, or as Ground Cover; 1999.
		I.	ASTM E 283-91 - Standard Test Method for Determining Rate of Air Leakage Through Exterior Windows, Curtain Walls, and Doors Under Specified Pressure Differences Across the Specimen; 1999.
		J.	CGSB 37-GP-56M - Membrane, Modified Bituminous, Prefabricated, and Reinforced for Roofing.
	1.4	SUBMITTALS
		A.	Submit under provisions of Section 01300.
		B.	[ Product Data ]: Manufacturer's data sheets on each product to be used, including:
			1.	Preparation instructions and recommendations.
			2.	Storage and handling requirements and recommendations.
			3.	Application methods.
		C.	Shop Drawings:
			1.	Submit manufacturer's shop drawings showing product dimensions, rough-in dimensions, trim and accessories.
			2.	Submit manufacturers drawings showing installation details and locations of each unit specified.
		D.	Verification Samples: For each product specified, two samples.
	1.5	QUALITY ASSURANCE
		A.	Manufacturer Qualifications: Minimum ten (10) years manufacturing air barriers and products related to the installation of air barriers.
		B.	Installer Qualifications: Installer shall have at least five (5) years experience installing air barriers of this type on projects of similar size and scope.
		C.	Source Limitations: Obtain all air barriers and related materials from one manufacturer through a single source.
		D.	Code Compliance: Finished air barrier shall be installed in accordance with all federal, state and local codes.
	** NOTE TO SPECIFIER ** Include a mock-up if the project size and/or quality warrant taking such a precaution. The following is one example of how a mock-up on a large project might be specified. When deciding on the extent of the mock-up, consider all the major different types of work on the project.
		E.	Mock-Up: Provide a mock-up for evaluation of surface preparation techniques and application workmanship.
			1.	Finish areas designated by Architect.
			2.	Do not proceed with remaining work until workmanship, color, and sheen are approved by Architect.
			3.	Refinish mock-up area as required to produce acceptable work.
	1.6	DELIVERY, STORAGE, AND HANDLING
		A.	Deliver materials to site in manufacturer's original, unopened containers and packaging, with labels clearly identifying product name and manufacturer.
		B.	Store materials in a clean dry area in accordance with manufacturer's instructions.
		C.	Store adhesives and primers at temperatures of 40 degrees Fahrenheit (5 degrees Celsius) and above to facilitate handling.
		D.	Store membrane cartons on pallets.
		E.	Do not store at temperatures above 90 degrees Fahrenheit (32 degrees Celsius) extended periods.
		F.	Keep away from sparks and flames.
		G.	Completely cover when stored outside. Protect from rain.
		H.	Protect materials during handling and application to prevent damage or contamination.
	1.7	ENVIRONMENTAL Conditions
		A.	Maintain environmental conditions (temperature, humidity, and ventilation) within recommended limits recommended for optimum results. Do not install products under environmental conditions outside manufacturer's absolute limits.
		B.	Air barriers are not intended for uses subject to abuse or permanent exposure to the elements.
		C.	Protect rolls from direct sunlight until ready for use.
		D.	Do not apply membrane when surfaces are frozen.
	1.8	WARRANTY
		A.	W.R. Meadows, 1nc. warrants at the time and place we make shipment, our material will be of good quality and will conform with the published specifications in force on the date of acceptance of the order. See actual warranty for specific terms and conditions.
	PART 2	PRODUCTS
	2.1	MANUFACTURERS
		A.	Acceptable Manufacturer: W. R. Meadows, Inc., which is located at: 300 Industrial Dr. P. O. Box 338 ; Hampshire, IL 60140-0338; Toll Free Tel: 800-342-5976; Tel: 847-214-2100; Fax: 847-683-4544; Email: request info; Web: www.wrmeadows.com
	** NOTE TO SPECIFIER ** Delete one of the following two paragraphs; coordinate with requirements of Division 1 section on product options and substitutions.
		B.	Substitutions: Not permitted.
		C.	Requests for substitutions will be considered in accordance with provisions of Section 01600.
	2.2	Air Vapor Barriers
		A.	Air-Shield Self-Adhering Air/Vapor Barrier Membrane: Polymeric air/vapor barrier membrane protected by release paper on cross-laminated polyethylene carrier film with exposed polymeric membrane strips on both sides protected by pull-off release strips. with the following physical properties:
			1.	Color:
				a.	Carrier Film: White.
				b.	Polymeric Membrane: Black.
			2.	Thickness: 40 mils (1mm).
			3.	Application Temperature: 40 degrees Fahrenheit. (4 degrees Celsius).
			4.	Film Tensile Strength:
				a.	ASTM D 412 modified (MD): 4,000 psi (27.6 MPa).
				b.	ASTM D 882 (MD): 23.5 lb/in. (4.1 N per mm).
			5.	Film Elongation:
				a.	ASTM D 412, modified (MD, percent): 400 (Typical).
				b.	ASTM D 882 (MD, percent): 400 Min.
			6.	Puncture Resistance, ASTM E 154: 40 lbf (178 N) Min.
			7.	Water Vapor Permeance (free film), ASTM E 96, Procedure B: 0.035 Perms.
			8.	Water Vapor Permeance (percent by weight):
				a.	ASTM D 1970: 0.25 Max.
				b.	ASTM D 570-81: 0.1 Max.
			9.	Air Leakage, ASTM E 283:
				a.	75 lb per sf (0.5167 Mpa): 0.00004 cfm per square foot. (0.0000118 CMM per sm).
				b.	250 lbs per sf (1.7225 Mpa): 0.00004 cfm per sf (0.0000118 CMM per sm).
				c.	500 lbs per sf (3.4450 Mpa): 0.00004 cfm per sf (0.0000118 CMM per sm).
			10.	Low Temperature Flexibility at -22 degrees Fahrenheit (-30 degrees Celsius), CGSB 37-GP-56M: Pass.
			11.	Lap Peel Strength at 39 degrees Fahrenheit (3.9 degrees Celsius), ASTM D 903, 180 Bend: 10 lbf per inch (1.75 N per mm).
		B.	Air-Shield LM: Single component, polymer modified, cold applied liquid air/vapor barrier membrane with the following physical properties:
			1.	Air Permeability ASTM E 283: 0.004 cfm per sf at 75 lbs per sf.
			2.	Water Vapor Permeance: ASTM E 96: 0.03 perms.
			3.	Elongation ASTM D 412: 1500 percent.
			4.	Tensile Strength: ASTM D 412: 15 psi.
		C.	Air-Shield™ LM (All Season) Liquid Air Vapor Barrier System: Single component, polymer modified, cold applied liquid air/vapor barrier membrane with the following physical properties:
			1.	Air Permeability: ASTM E 283: 0.004 cfm per sf at 75 lbs per sf.
			2.	Water Vapor Permeance: ASTM E 96: 0.06 perms.
			3.	Elongation ASTM D 412: greater than 1000 percent.
			4.	Solids: 65 percent.
	2.3	Accessories
	** NOTE TO SPECIFIER ** Delete one of the next two paragraphs. Solvent based primer must be used when temperatures are below 40 degrees F (40 degrees Celsius).
		A.	Primer: Mel-Prime Water Base Primer with the following physical properties:
			1.	Coverage Rate: 250 to 350 sf per gallon (6.14 to 8.59 sm per liter.
			2.	Flash point: 210 degrees Fahrenheit (98.9 degrees Celsius).
			3.	VOC Compliant.
			4.	Application Temperature: Above 40 degrees Fahrenheit (4 degrees Celsius).
		B.	Primer: Mel-Prime Solvent-Base VOC Compliant Primer with the following physical properties:
			1.	Coverage Rate: 250 to 300 sf per gallon (6.14 to 7.37 sm per liter).
			2.	Flash point: 50 degrees Fahrenheit (10 degrees Celsius).
			3.	VOC Compliant.
			4.	Application Temperature: Above 40 degrees Fahrenheit (4 degrees Celsius).
		C.	Sealer: W.R. Meadows Pointing Mastic, cold applied, single-component polymeric sealing compound with the following physical properties:
			1.	Coverage Rate: 200 lineal feet per gallon (16.1 lineal meters per liter).
			2.	Flash point: 110 degrees Fahrenheit (43.3 degrees Celsius).
			3.	Application Temperature: Above 40 degrees Fahrenheit (4 degrees Celsius).
		D.	Termination Bar: W.R. Meadows Termination Bar, multi purpose, pre formed plastic strip designed to properly terminate Air-Shield membranes, with the following physical properties:
			1.	Length: 10 (3048mm) foot by 1 1/8 inch (28.6mm) sections with holes every 6 inches (152mm).
			2.	Color: White
			3.	Trapezoidal profile acts as a receiver lip for application of sealants.
	PART 3	EXECUTION
	3.1	EXAMINATION
		A.	Examine surfaces to receive membrane. Notify Architect if surfaces are not acceptable. Do not begin surface preparation or application until unacceptable conditions have been corrected.
	3.2	SURFACE PREPARATION
		A.	Air-Shield Self-Adhering Air/Vapor Barrier Membrane
			1.	Protect adjacent surfaces not designated to receive air/vapor barrier system.
			2.	Clean and prepare surfaces to receive air/vapor barrier in accordance with manufacturer's instructions.
			3.	Do not apply air/vapor barrier to surfaces unacceptable to manufacturer.
			4.	All surfaces must be clean, smooth and dry and must be clean of oil, dust and excess mortar.
			5.	Strike masonry joints flush.
			6.	Patch all holes and voids and smooth out any surface misalignments.
			7.	Concrete surfaces must be cured for a minimum of 14 days.
			8.	If curing compounds are used, they must be clear, resin based, without oil, wax, or pigments.
		B.	Air-Shield LM / Air Shield LM (All Season)
			1.	Protect adjacent surfaces not designated to receive air/vapor barrier.
			2.	Clean and prepare surfaces to receive air/vapor barrier membrane in accordance with manufacturer's instructions.
			3.	Do not apply membrane to surfaces unacceptable to manufacturer.
			4.	Concrete surfaces must be clean, free of standing water, ice, snow, frost, dust, dirt, oil, curing compounds or any other foreign material that could prevent proper adhesion of the membrane.
			5.	Patch all holes and voids and smooth out any surface misalignments.
			6.	Cracks in masonry and concrete should be sealed with a strip of self-adhesive membrane 6" (150 mm) wide, centered over the crack.
			7.	Ensure joints between dissimilar building materials are sealed with a strip of self-adhesive membrane 6" (150 mm) wide, centered over the joint.
			8.	If using exterior sheathing panels, ensure all joints over 1/4" are taped with minimum 2" wide contractors' mesh style wall tape. Staple mesh tape to panels if spraying air/vapor barrier membrane.
	3.3	APPLICATION
		A.	Air-Shield Self-Adhering Air/Vapor Barrier Membrane
			1.	Apply air/vapor barrier membrane system in accordance with manufacturer's instructions.
			2.	Ensure accessory materials are compatible with membrane and approved by membrane manufacturer.
			3.	Prime surfaces to be covered in one working day with applicable primer. Re-prime uncovered surfaces next day.
			4.	Inspect membrane before covering and repair as necessary. Cover tears and inadequate overlaps with membrane. Seal edges of patches with pointing mastic.
			5.	Seal all end laps and protrusions with pointing mastic.
			6.	Avoid use of products, which contain tars, solvents, pitches, polysulfide polymers, or PVC materials that may come into contact with waterproofing membrane system.
		B.	Air-Shield LM / Air Shield LM (All Season)
			1.	Apply air/vapor barrier membrane in accordance with manufacturer's instructions.
			2.	Thoroughly mechanically mix membrane prior to application.
			3.	Apply membrane by spray or roller at a minimum coverage rate of 17-20 ft2/U.S. gal (1.6-1.9 m2/3.78L) providing a thickness of 80 wet mils in two coats.
			4.	Frequently inspect surface area with a wet mil gauge to ensure consistent thickness.
			5.	Work material into any fluted rib forming indentations.
			6.	Cured thickness of membrane should be 45 mils dry.
			7.	Avoid use of products which contain tars, solvents, pitches, polysulfide polymers, or PVC materials that may come into contact with waterproofing membrane system.
	3.4	PROTECTION
		A.	Air-Shield Self-Adhering Air/Vapor Barrier Membrane
			1.	Apply insulation as soon as possible to protect the air/vapor barrier membrane.
		B.	Air-Shield LM
			1.	Allow material to air dry to a tack-free film prior to placement of insulation.
			2.	Cover air/vapor barrier membrane as soon as possible, within 30 days, since it is not designed for permanent exposure.
		C.	Air-Shield LM (All Season)
			1.	Allow material to air dry for a minimum of 48 hours prior to placement of insulation.
			2.	Cover air/vapor barrier membrane as soon as possible, within 30 days, since it is not designed for permanent exposure.
	END OF SECTION