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	SECTION 07270
	AIR BARRIERS
	** NOTE TO SPECIFIER ** Tremco Commercial Sealants and Waterproofing; Air Barriers. . This section is based on the products of Tremco Commercial Sealants and Waterproofing, which is located at: 3735 Green Road. Beachwood, OH 44122. Toll Free Tel: (800)321-7906. Te1: (216)292-5000. Fax: (216)766-5543. Email: TSCS@tremcoinc.com. Web: www.tremcosealants.com. . Tremco Global Sealants Division is the world's foremost supplier of sealant, weatherproofing, residential waterproofing and passive fire control solutions for commercial and residential construction and industrial applications. For generations, Tremco has successfully provided products and services to architects, engineers, home builders, contractors and building owners worldwide.
	PART 1	GENERAL
	1.1	SECTION INCLUDES
	** NOTE TO SPECIFIER ** Delete items below not required for project.
		A.	Materials and installation methods for fluid-applied air and vapor barrier membrane system located in the non-accessible part of the wall.
		B.	Materials and installation methods to bridge and seal the following air leakage pathways and gaps
			1.	Connections of the walls to the roof air barrier.
			2.	Connections of the walls to the foundations, seismic and expansion joints, openings and penetrations of window frames, store front, and curtain wall, barrier precast cast and other envelope systems, door frames, piping, conduit, duct and similar penetrations, masonry ties, screws, bolts and similar penetrations.
			3.	All other air leakage pathways in the building envelope.
	1.2	RELATED SECTIONS
	** NOTE TO SPECIFIER ** Delete any sections below not relevant to this project; add others as required.
		A.	Section 03300 - Cast-In-Place Concrete.
		B.	Section 04200 - Masonry.
		C.	Section 07140 - Fluid-Applied Waterproofing.
		D.	Section 07160 - Dampproofing.
		E.	Section 07210 - Insulation.
		F.	Section 07530 - Roof Membrane [and Vapor Retarder].
		G.	Section 07600 - Flashing and Sheet Metal.
		H.	Section 07900 - Joint Sealers.
		I.	Section 08520 - Aluminum Windows.
		J.	Section 08920 - Glazed Aluminum Curtain Walls.
		K.	Section 09250 - Gypsum Sheathing.
	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 412 - Standard Test Methods for Rubber Properties in Tension; 1987.
		B.	ASTM C 836 - Standard Specification for Cold Liquid Applied Waterproofing Membranes with a Separate Wearing Course; 1995.
		C.	ASTM D 2939 - Standard Test Methods for Emulsified Bitumens Used as Protective Coatings; 1994.
		D.	ASTM D 1970 - Standard Specification for Self-Adhering Polymer Modified Bituminous Sheet Materials Used as Steep Roofing Underlayment for Ice Dam Protection; 1994.
		E.	ASTM D 3767 - Standard Practice for Rubber - Measurements of Dimensions; 1992.
		F.	ASTM E 96 - Test Methods for Water Vapor Transmission of Materials; 1995.
		G.	ASTM A 167 - Specification for Stainless and Heat-Resisting Chromium-Nickel Steel Plate, Sheet, and Strip; 1996.
		H.	ASTM E 2178-01 Standard Test Method for Air Permeance of Building Materials; 2001.
		I.	ASTM D 2000 - Classification System for Rubber Products in Automotive Applications; 1998.
		J.	Canadian Construction Materials Centre (CCMC):
			1.	Technical Guide 07273: Air Barrier Materials.
	1.4	PERFORMANCE REQUIREMENTS
		A.	Provide an air and vapor barrier constructed to perform as a continuous air and vapor barrier, and as liquid water drainage plane flashed to discharge any incidental condensation or water penetration.
		B.	Design and construct the building envelope with a continuous air barrier to control air leakage into, or out of the conditioned space. Provide an air barrier for interior partitions between conditioned space and space designed to maintain temperature or humidity levels which differ from those in the conditioned space by more than 50 percent of the difference between the conditioned space and design ambient conditions.
		C.	Air Barrier Characteristics:
			1.	Continuous, with all joints made airtight.
			2.	Air permeability not to exceed 0.004 cfm/ft2 under a pressure differential of 0.3 in. water. (1.57 psf.) (equal to 0.02 L/s/m2 @ 75 Pa.) when tested in accordance with ASTM E2178-01.
			3.	Capable of withstanding positive and negative combined design wind, fan and stack pressures on the envelope without damage or displacement, and transfer the load to the structure.
			4.	No displacement of adjacent materials under full load.
			5.	It shall be durable or maintainable.
			6.	Joined in an airtight and flexible manner to air barrier materials of adjacent systems, allowing for the relative movement of systems due to thermal and moisture variations and creep.
		D.	Maintain connections between the following points:
	** NOTE TO SPECIFIER ** Retain only locations where air barriers apply. Delete all other locations from the next 7 options.
			1.	Foundation and walls.
			2.	Walls and windows or doors.
			3.	Different wall systems.
			4.	Wall and roof.
			5.	Wall and roof over unconditioned space.
			6.	Walls, floor and roof across construction, control and expansion joints.
			7.	Walls, floors and roof to utility, pipe and duct penetrations.
		E.	Penetrations: All penetrations of the air barrier and paths of air infiltration/exfiltration must be made airtight.
	1.5	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.	Installation methods.
		C.	Shop drawings: Submit plan, section, elevation and perspective drawings as required to show the locations and extent of air and vapor barrier system including but not limited to the following:
			1.	Details of typical conditions, intersections with other envelope systems and materials
			2.	Membrane counter-flashings and details showing how gaps in the construction will be bridged
			3.	Sealing of miscellaneous penetrations such as conduits, pipes, etc.
		D.	Samples: Submit representative cured samples of the fluid-applied, transition, and through-wall flashing membranes.
		E.	Certifications:
			1.	Submit certifications from air and vapor barrier manufacturer that products supplied comply with local regulations controlling use of volatile organic compounds (VOC's).
			2.	Submit documentation from manufacturer that air barrier materials and accessories are compatible.
	1.6	QUALITY ASSURANCE
		A.	Manufacturer: Air and vapor barrier materials must be manufactured and marketed by a single firm with a minimum of 20 years experience in the production and sales of waterproofing products.
		B.	Installer:
			1.	The installer must demonstrate qualifications to perform the Work of this section by submitting written confirmation or certification from the air barrier manufacturer that they have been trained and are recognized as suitable for the execution of the work.
			2.	Installer must show evidence of adequate equipment and trained field personnel to successfully complete the project in a timely manner. Both the architect and the air barrier materials manufacturer must approve the installer's credentials.
		C.	Materials: Fluid-applied air and vapor barrier material shall be water-based and an elastomeric, single-component, polymer-modified, asphaltic membrane, and contain less than 100 gm/l VOC.
		D.	Pre-Installation Conference: Hold a pre-installation conference prior to commencement of field operations in accordance with Section 01200 to establish procedures to maintain optimum working conditions and to coordinate this work with related and adjacent work. Agenda for meeting will include but not be limited to the following:
			1.	Review of submittals.
			2.	Review of surface preparation, minimum curing period and installation procedures.
			3.	Review of special details and flashings.
			4.	Sequence of construction, responsibilities and schedule for subsequent operations.
			5.	Review of mock-up requirements.
			6.	Review of inspection, testing, protection and repair procedures.
			7.	Review and approval of all structural glazing application by Tremco Technical Service are required.
		E.	Manufacturer's Representative: Make arrangements necessary to have a trained representative of the manufacturer to review installation procedures. Notify manufacturer's representative not less than 72 hours before meeting is to be held.
	** 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.
		F.	Mock-up: Prior to installation of the air and vapor barrier system a field-constructed mock-up shall be provided under the provisions of Section 01340 to verify details and tie-ins and demonstrate the required quality of materials and installation. Construct a typical exterior wall section, 8 feet long and 8 feet wide (2438x2438mm), incorporating back-up wall, cladding, window and doorframe and sill, insulation, flashing and any other critical junction (roof, foundation, etc). Allow 24 hours for inspection and testing of mock-up before proceeding with air and vapor barrier work. Mock-up may remain as part of the work.
		G.	Inspection and Testing: Cooperate and coordinate with the Owner's inspection and testing agency. Do not cover any installed air and vapor barrier membrane until any required inspections, testing, and approvals have been completed.
	1.7	DELIVERY, STORAGE, AND HANDLING
		A.	Deliver materials and products in labeled packages.
		B.	Store and handle in strict compliance with manufacturer's instructions, recommendations and material safety data sheets. Protect from damage from sunlight, weather, excessive temperatures and construction operations.
		C.	Store ExoAir 120 off the ground/floor at an ambient temperature above 50F (10C). Do not freeze. Protect the drums from direct sunlight. If ExoAir 120 is delivered in totes, follow manufacturers' instructions for handling, stacking and storage of totes.
		D.	Sequence deliveries to avoid delays while keeping on-site storage at a minimum.
		E.	Store and dispose of damaged and / or hazardous materials, and materials contaminated by hazardous materials, in accordance with requirements of local authorities having jurisdiction.
	1.8	PROJECT CONDITIONS
		A.	Apply air and vapor barrier within the weather conditions and the range of ambient and substrate temperatures specified by air and vapor manufacturer.
	** NOTE TO SPECIFIER ** Retain the next paragraph only if ExoAir 120 is specified.
		B.	Do not apply to a wet substrate. Damp substrates, determined by rubbing a hand across the substrate and seeing no water/dampness on the skin, are suitable for application of ExoAir 120.
	** NOTE TO SPECIFIER ** Retain the next paragraph only if ExoAir 110/110LT or ExoAir TWF is specified.
		C.	Substrates receiving ExoAir 110/110LT or ExoAir TWF should be dry. Proceed with installation only when the substrate construction and preparation work is complete and in condition to receive the air and vapor barrier membrane.
	1.9	WARRANTY
		A.	At project closeout, provide to Owner or Owners Representative an executed copy of the manufacturer's warranty, outlining its terms, conditions, and exclusions from coverage.
	PART 2	PRODUCTS
	2.1	MANUFACTURERS
		A.	Acceptable Manufacturer: Tremco Commercial Sealants & Waterproofing, which is located at: 3735 Green Rd. ; Beachwood, OH 44122; Toll Free Tel: 800-321-7906; Tel: 216-292-5000; Fax: 216-766-5543; Email: request info; Web: www.tremcosealants.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	FLUID-APPLIED AIR BARRIER MEMBRANE
		A.	ExoAir 120: Water-based, polymer-modified, asphaltic, air and vapor barrier material.
		B.	Physical Characteristics:
			1.	Color: Black.
			2.	Cured Film Thickness: 40 mils min.
			3.	Solids Content: 62 percent.
			4.	Air Leakage @ 75Pa Differential Pressure - ASTM E 2178-0 / CCMC 07273: 0.00120 l/s/m2.
			5.	Water Vapor Permeance - ASTM E 96: 0.08 perms.
			6.	Elongation - ASTM D 412: 1500 percent.
			7.	Chemical Resistance: Resists alkalis, mild acids and salt solutions.
			8.	Maximum Volatile Organic Compounds (VOC): 100 grams/liter.
	2.3	AUXILIARY MATERIALS
	** NOTE TO SPECIFIER ** Retain only products required on this project and delete all others from the included 9 options
		A.	Transition Membrane:
			1.	ExoAir 110 and ExoAir 110LT (Low-Temperature) Membrane - Self-adhered air and vapor barrier membrane, 36 mils (.90mm) of self-adhering SBS rubberized asphalt laminated to a 4 mil (.10mm) cross-laminated, high-density polyethylene film with a siliconized release liner.
		B.	Flashing Membrane:
			1.	ExoAir TWF (Thru-Wall Flashing): Self-adhered through-wall flashing membrane, 32 mils (.80mm) of self-adhering SBS rubberized asphalt laminated to a 8 mil (.20mm) cross-laminated, high-density polyethylene film with a siliconized release liner.
		C.	Transition and Flashing Membrane Primer:
			1.	ExoAir WB: Water-based liquid primer for extruded polystyrene, concrete, masonry, gypsum sheathing, wood, metal, and painted substrates.
		D.	Transition and Flashing Membrane Primer:
			1.	ExoAir Primer: Solvent-based, VOC compliant liquid primer for concrete, masonry, gypsum sheathing, wood, metal, and painted substrates.
			2.	ExoAirSYMBOL 212 GM (Glass-Mat) Primer: Solvent-based, VOC compliant liquid primer for gypsum sheathing.
		E.	Butyl-based Self-Adhered Membrane: Transition between air and vapor barrier membrane and TPO or EPDM membranes.
		F.	Mastic:
	** NOTE TO SPECIFIER ** Select mastic type. Delete one of the next two paragraphs.
			1.	TREMproof 201T: Liquid mastic for sealing around brick ties, penetrations and lap and T-joints.
			2.	Pre-approved sealant manufactured by Tremco.
		G.	Stainless-Steel Sheet Flashing: ASTM A167, Type 304, soft annealed, with No. 2D finish; minimum, 0.0156 inch (0.4 mm) thick.
		H.	Air Barrier Perimeter Seal to Windows, Doors, Curtainwall and Storefront Systems:
			1.	Proglaze Engineered Transition Assembly (ETA), with the following properties:
				a.	Color: Translucent.
				b.	Thickness: 40 mils.
				c.	Elongation (Membrane) - ASTM D 412 Die C: 323 percent.
				d.	Tensile Strength (Membrane) - ASTM D 412 Die C: 1060 psi
				e.	Water Vapor Permeance - ASTM E 96 (Dry Cup Method): 2.59 perms
				f.	Air Leakage:
					1)	Tested at 75Pa Differential Pressure (1.57psf) - ASTM E 283: Less than 0.05 L/s/m2 (<0.01 cfm.ft2).
					2)	Tested at 300Pa Differential Pressure (6.24psf) - ASTM E 283: Less Than 0.05 L/s/m2 (<0.01 cfm/ft2).
				g.	Water Resistance - ASTM E 547/ASTM E 331: No leakage.
				h.	Uniform Load Deflection:
					1)	Tested at 6699 Pa ( 15.0 psf) - ASTM E 330: No damage.
					2)	Tested at: 10,049 Pa (210.0 psf) - ASTM E 330: No damage.
		I.	Transition Assembly: Pre-engineered, finished aluminum and silicone materials. The system assembly is mechanically attached to the window assembly to assure a durable seal is achieved. The engineered transitions assembly is comprised of the following components;
			1.	Silicone Rubber Sheet (SRS): Extruded, 40 durometer, translucent silicone, with a lock-in dart.
			2.	Silicone Rubber Corners (SRC): Pre-molded, 40 durometer, translucent silicone, with a lock in dart. Dart is offset by 1.5 inches (38mm) to allow a lap joint to be made with the Silicone Rubber Extrusion (SRE).
			3.	Silicone Sealant:
				a.	Spectrem 1: ASTM C 920, single-component, neutral-curing silicone; Class 100/50, Grade NS.
			4.	Extruded Aluminum Adapter (EAA): Alodine finished, with pre-engineered race for receiving silicone lock-in dart. Extrusion is supplied in 5 foot lengths with predrilled holes and pre-applied Tremco 440 Tape.
			5.	Tremco 440 Tape: 100 percent solid Polyisobutylene-cross linked butyl preformed sealant.
	PART 3	EXECUTION
	3.1	EXAMINATION
		A.	The installer must examine conditions of substrates, areas and other conditions under which air barrier systems will be applied for compliance with requirements.
		B.	Verify that surfaces and conditions are suitable prior to commencing work of this section.
		C.	Notify the Architect in writing of circumstances detrimental to the proper completion of the work. Do not proceed with installation until unsatisfactory conditions have been corrected.
	3.2	PREPARATION
		A.	Clean, prepare and treat substrates according to manufacturers' written instructions. Surfaces to be coated must be clean, smooth, firm, free of dust, mud, loose mortar, wires, fins or any other substance that might prevent placement and bonding of a continuous film. Remove contaminants such as grease, oil and wax from exposed surfaces. Use repair materials and methods that are acceptable to manufacturer of the fluid-applied membrane.
	** NOTE TO SPECIFIER ** Select Exterior Sheathing Board preparation method from the next two paragraphs. Delete one of the next two paragraphs or both if exterior sheathing board is not found on the project.
		B.	Exterior Sheathing Board Joints and Inside/Outside Corners:
			1.	Ensure that the boards are sufficiently stabilized with corners and edges fastened with appropriate screws. Pre-treat all board joints with 2-3 inch (50-75mm) wide, reinforced, self-adhesive, fiberglass mesh-style wallboard tape.
			2.	Gaps greater than 1/16 inch (2mm) should be filled, and adjacent substrate covered with a 30 mil coat of TREMproof 201T or pre-approved Tremco sealant. Coating width should exceed width of tape. Fully embed tape into uncured TREMproof 201T or sealant then overcoat with an additional 30 mil coat.
			3.	Allow sufficient time for sealant to fully cure before application of ExoAir 120. Detail inside and outside corners as above.
		C.	Exterior Sheathing Board Joints and Inside/Outside Corners:
			1.	Prime area to be detailed using ExoAir Primer, WB Primer or GM primer and allow to cure. Ensure gypsum sheathing and other substrates receiving ExoAir 110/110LT receive an adequate amount of ExoAir Primer or WB Primer to achieve required bond to substrate.
			2.	Apply a minimum 3 inch (75mm) width of ExoAir 110/110LT to the area to be treated. Use a roller to apply pressure to the entire surface to remove all air pockets and assure positive contact to the substrate.
	** NOTE TO SPECIFIER ** Delete the next paragraph if masonry substrates are not found on the project.
		D.	Masonry Substrates: Repair any cracks, voids, and unfilled mortar joints with non-shrinking grout.
	3.3	INSTALLATION
		A.	General:
			1.	Use pre-cut, easily handled lengths for each location. Remove release paper, position membranes carefully before placing them against the surface. Use a roller to apply pressure to the entire surface to remove all air pockets and assure positive contact to the substrate. If an edge is not going to be over coated with ExoAir 120 fluid-applied air and vapor barrier membrane, seal the edge with TREMproof 201T or other pre-approved Tremco sealant. If a transition membrane is to be attached to ExoAir 120, ExoAir 120 must be cured (16-24 hours and/or firm and dry to the touch) prior to installing the transition membrane.
			2.	Prior to completion of the air barrier project work or at the end of each work day, apply TREMproof 201T or other pre-approved Tremco sealant to the top edge seam of ExoAir 110/110LT or ExoAir TWF. Tool the TREMproof 201T to ensure it is worked into the surface.
			3.	Coordinate installation of the air barrier system with the roofing trade to ensure continuity and compatibility with the roofing system at this critical transition area. Connect the air barrier membrane to adjacent parts of the building envelope such as the roof membrane air barrier, below-grade wall, window and curtain wall systems, and other parts of the building envelope.
		B.	Application of Transition and Through-Wall Flashing Membranes:
			1.	Apply ExoAir 110/110LT transition, and ExoAir TWF through-wall flashing membranes, before or after application of ExoAir 120 membrane so that the membrane assemblies create a shingle effect from top of the building to the bottom.
			2.	Prior to the installation of ExoAir 110/110LT and ExoAir TWF, prime area to be detailed using ExoAir Primer, ExoAir WB Primer or ExoAir GM primer and allow to cure.
			3.	Install transition membranes at all beams, columns, joints and all windows, doors and penetrations as indicated in detail drawings, overlapping edge seams a minimum of 2 inches (50mm) and end laps a minimum of 5 inches (128mm).
		C.	Window and Curtain Wall Systems: Use Spectrem 1 or other pre-approved Tremco sealant to connect to ExoAir 110/110LT transition membranes or ExoAir TWF.
		D.	Window and Door Frames, Spandrel Panels, Floor Intersections and Changes in Substrates:
			1.	Install ExoAir TWF, and trim bottom edge 1/2 inch (13mm) back from exposed face of the wall.
			2.	Bring ExoAir 110/110LT and ExoAir TWF a minimum of 3 inches (75mm) onto wall, window, door frame and other substrates.
			3.	Apply transition and through-wall flashing membranes in appropriate lengths and in such a manner as to ensure continuity of the entire air barrier assembly.
			4.	ExoAir TWF must not be permanently exposed to sunlight.
		E.	Through-Wall Flashings:
			1.	Provide an additional 6 inch (152mm) wide strip of ExoAir TWF to seal top of through-wall flashing to ExoAir 110/110LT installed on substrate.
			2.	Seal top edge of ExoAir TWF with TREMproof 201T or other pre-approved Tremco sealant.
			3.	Tool the TREMproof 201T to ensure it is worked into the surface.
		F.	Application of Fluid-Applied Membrane:
			1.	Use high pressure, airless spray equipment approved by Tremco.
			2.	Spray a continuous uniform film of ExoAir 120 at 60 mils (1.5mm) min. wet film thickness using multiple, overlapping passes. When spraying use a cross-hatching technique (alternating horizontal and vertical passes) to ensure even thickness and coverage.
			3.	Seal all brick-ties and other penetrations with ExoAir 120 or TREMproof 201T as appropriate and as work progresses. Carry ExoAir 120 a minimum of 3 inches (75mm) onto the ExoAir 110/110LT transition and ExoAir TWF membranes.
			4.	Review final ExoAir 120 application to ensure all substrates have been fully coated, and that there are no passages remaining for air infiltration / exfiltration, water vapor transmission or water penetration.
		G.	Inspect all membranes before covering and repair any punctures or damaged areas with pre-approved Tremco methods and materials, extending repair material a minimum of 6 inches (152mm) beyond the puncture or damage.
	3.4	CLEANING
		A.	Remove any masking materials after installation. Clean spillage and soiling on adjacent construction that will be exposed in the finished work using cleaning agents and procedures recommended by manufacturer of the affected construction.
	3.5	PROTECTION
		A.	Protect membranes to avoid damage from other trades, and construction materials during subsequent operations.
		B.	Insulation and/or protection products may be installed after all membranes have cured (16-24 hours and/or firm and dry to the touch).
		C.	Schedule work so that the air and vapor barrier system is covered as soon as possible after installation. If the air and vapor barrier system cannot be covered within 30 days after installation, apply temporary UV protection such as dark plastic sheet or tarpaulins. Contact Tremco for additional recommendations.
	END OF SECTION