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	SECTION 07240
	WATERPROOFING AIR BARRIER
	** NOTE TO SPECIFIER ** Sto Corp.; StoGuard waterproofing/air barrier products. . This section is based on the products of Sto Corp., which is located at: 3800 Camp Creek Pkwy. Building 1400 Suite 120 Atlanta, GA 30331 Toll Free Tel: 888-786-2955 Tel: 404-346-3666 Fax: 404-346-3119 Email: request info Web: www.stocorp.com [ Click Here ] for additional information. Sto is the innovative world leader of cladding, coating, and restoration systems. Sto is the world's largest manufacturer of Exterior Insulation and Finish Systems (EIFS) for residential, commercial and industrial buildings. Sto offers building owners complete solutions to their restoration and structure enhancement needs. We offer design expertise with StoDesign and technical expertise including detail and plan reviews, etc. This section includes StoGuard waterproofing/air barrier products. StoGuard is a system of products, that combined, is a spray-on waterproofing, air barrier that is vapor permeable. It is applied directly to sheathing, joints, and rough openings, and is used in place of building wrap underneath brick, wood, vinyl, cement siding, Portland cement stucco and EIFS. StoGuard allows for water vapor diffusion while limiting air infiltration, thus it is a 'breathable" air barrier. In climates with seasonal temperature fluctuations, a water vapor permeable assembly is preferred for year round performance and air quality.
	PART 1	GENERAL
	1.1	SECTION INCLUDES
	** NOTE TO SPECIFIER ** Delete items below not required for project.
		A.	Waterproofing/air barrier over vertical above grade concrete walls, concrete masonry walls, and wall sheathing.
	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 04800 - Concrete Unit Masonry Assemblies.
		C.	Section 06160 - Sheathing.
		D.	Section 07240 - Exterior Insulation and Finish Systems.
		E.	Section 07260 - Vapor Retarders.
		F.	Section 07500 - Membrane Roofing.
		G.	Section 07600 - Flashing and Sheet Metal.
		H.	Section 07900 - Joint Sealers.
		I.	Section 08500 - Windows.
		J.	Section 09220 - Portland Cement Stucco.
	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 C 297 - Test Method for Tensile Strength of Flat Sandwich Constructions in Flatwise Plane.
		B.	ASTM C 1177 - Specification for Glass Mat Gypsum Substrate for Use as Sheathing.
		C.	ASTM C 1396 - Standard Specification for Gypsum Board.
		D.	ASTM D 1970 - Standard Specification for Self-Adhering Polymer Modified Bituminous Sheet Materials Used as Steep Roofing Underlayment for Ice Dam Protection.
		E.	ASTM D 224 - Practice for Testing Water Resistance of Coatings in 100% Relative Humidity.
		F.	ASTM D 4541 - Test Method for Pull-Off Strength of Coatings Using Portable Adhesion Testers.
		G.	ASTM E 72 - Test Methods of Conducting Strength Tests of Panels for Building Construction.
		H.	ASTM E 84 - Test Method for Surface Burning Characteristics of Building Materials.
		I.	ASTM E 96 - Test Method for Water Vapor Transmission of Materials.
		J.	ASTM E 283 - Test Method for Determining the Rate of Air Leakage Through Exterior Windows, Curtain Walls, and Doors Under Specified Pressure Differences Across the Specimen.
		K.	ASTM E 331 - Test Method for Water Penetration of Exterior Windows, Skylights, Doors and Curtain Walls by Uniform Static Air Pressure Difference.
		L.	ASTM E 1233 - Test Method for Structural Performance of Exterior Windows, Curtain Walls and Doors by Cyclical Static Air Pressure Differential.
		M.	APA E 30 - Residential and Commercial Construction Guide.
		N.	AATCC (American Association of Textile Chemists and Colorists), Test Method 127, Water Resistance: Hydrostatic Pressure Test.
		O.	Gypsum Association GA-600 - Fire Resistance Design Manual.
		P.	Gypsum Association GA-253 - Recommended Specifications for the Application of Gypsum Sheathing.
		Q.	Gypsum Association GA-254 - Fire-Resistant Gypsum Sheathing.
		R.	ASHRAE Handbook - Fundamentals.
		S.	SBCCI PST & ESI Evaluation Guide on Floor, Wall, and Roof Systems (Testing for Moisture Protection Barriers), Evaluation Guide 119.
		T.	UBC 26-9, Method of Test for the Evaluation of Flammability Characteristics of Exterior, Nonload-Bearing Wall Assemblies Containing Combustible Components Using the Intermediate-Scale, Multistory Test Apparatus.
		U.	ICC Acceptance Criteria for Water-Resistive Coatings Used as Water-Resistive Barriers over Exterior Sheathing, AC 212.
		V.	CCMC Technical Guide on Air Barriers.
	1.4	DESIGN REQUIREMENTS
		A.	Structural (Wind and Axial Loads).
			1.	Design for maximum allowable deflection normal to the plane of the wall: L/240.
			2.	Design for Wind Load in conformance with applicable code requirements.
		B.	Moisture Control: Design to prevent the accumulation of water into or behind the exterior wall assembly.
			1.	Minimize condensation within the assembly.
			2.	Drain water directly to the exterior where it is likely to penetrate windows, doors and other components in the wall assembly.
		C.	Air Barrier Continuity: Provide continuous air barrier system of compatible air barrier components.
		D.	Mechanical Ventilation: maintain pressurization and indoor humidity levels in accordance with recommendations of ASHRAE Handbook, Fundamentals.
	1.5	PERFORMANCE REQUIREMENTS
	** NOTE TO SPECIFIER ** Select one of the following two paragraphs for the Waterproofing/Air Barrier product required and delete the one not required. Sto EmeraldCoat is specially formulated for use over vertical above grade concrete walls, concrete masonry walls, and wall sheathing and under stucco and other claddings. Sto Gold Coat is specially formulated for use over vertical above grade concrete walls, concrete masonry walls, and wall sheathing and under EIFS and other claddings
		A.	StoGuard Waterproofing/Air Barrier, Sto EmeraldCoat shall meet or exceed the following Performance Data:
			1.	Tensile Bond: ASTM C 297, Minimum 15 psi (105 kPa)
				a.	Exposure 1 OSB: 32 psi (221 kPA).
				b.	Exterior Plywood: 86 psi (592 kPA).
				c.	DensGlass Gold: exceeds strength of glass mat facing.
				d.	Gypsum Sheathing: exceeds strength of paper facing
			2.	Freeze/Thaw: ICC AC 212, 4.2, No deleterious effects (view under 5X magnification) after 10 cycle exposure.
			3.	Water Resistance Testing:
			4.	ASTM D 2247, No deleterious effects after 14 day exposure.
			5.	Surface Burning: ASTM E 84:
				a.	Flame Spread: Less than 25.
				b.	Smoke Developed: Less than 450.
				c.	NFPA or ICC Class A building material.
			6.	Water Vapor Transmission: ASTM E 96, Method B (Water Method) Measure:
				a.	Sto Gold Fill: 17.3 perms (994 ng/(Pa*s*m2)).
				b.	Sto EmeraldCoat: 17.0 perms (976 ng/(Pa*s*m2)).
			7.	Structural, Racking, and Restrained Environmental Cycling Sequence, ASTM E 1233, ASTM E 72 and ICC AC 212, 4.6.3, No cracking in field or at substrate joints.
			8.	Air Leakage Sto Gold Fill: ASTM E 283 (CCMC Technical Guide Method), Less than 0.002 ft3/min*ft2) @ 1.56psf (Less than 0.0014 L/s*m2).
			9.	Water Penetration: ASTM E 331, No water penetration after structural, racking, and restrained environmental cycling sequence at 2.86 psf (137 Pa) for 15 minutes.
			10.	Water Penetration after Weathering and Aging: ICC AC 212, 4.8, No cracking, bond failure or water penetration after 210 hours UV exposure at 135-145 degrees F (57-60 degrees C) followed by aging: 25 cycles of oven drying at 120 degrees F (49 degrees C), water immersion, and drying at 75 degrees F (24 degrees C).
			11.	Nail Sealability: ASTM D 1970, par 7.9.1, No water penetration at galvanized roofing nail penetration under 5 inches (127 mm) head of water after 3 days at 40 degrees F (4 degrees C) over plywood and DensGlass Gold sheathings.
			12.	Structural, Racking, and Restrained Environmental Cycling Sequence: ASTM E 1233, ASTM E 72 and ICC AC 212, 4.6.3, No cracking in field or at substrate joints.
		B.	StoGuard Waterproofing/Air Barrier, Sto Gold Coat shall meet or exceed the following Performance Data:
			1.	1. Aging/Water Penetration Resistance : AATCC 127 (Water Column). Resist 21.6 in (55 cm) water for 5 hours before and after aging. No water penetration before and after aging.
			2.	Structural Loading/Water Penetration Testing: ASTM E 1233 / ASTM E 331. No water at exterior plane of sheathing. (exterior gypsum, Dens-Glass Gold, plywood, OSB) after 10 cycles @ 80 percent design load and 75 minutes water spray at 6.24 psf (299 Pa) differential. No water penetration.
			3.	Cyclic Pressure/Water Penetration Testing: ASTM E 283/ ASTM E 331. No water penetration or evidence of elevated moisture levels in plywood sheathing after 10 cycles of conditioning at 299 Pa (6.24 psf) positive and negative pressure followed by 75 minutes water spray at 6.24 psf (299 Pa) pressure differential with water spray rate of 5 gal/ft2*hr (3.4 L/m2*min). No water penetration, no elevated moisture levels.
			4.	Water Resistance Testing : ASTM D 2247. No deleterious effects after 14 day exposure.
			5.	Resistance to Mold Growth: ASTM D 3273. No mold growth after 28 day exposure.
			6.	Freeze/Thaw Resistance: ICBO Method (AC 24). No visible deleterious effects at 5x magnification.
			7.	Water Vapor Transmission: ASTM E 96, Method B (Water Method).
				a.	Sto Gold Fill: 17.3 perms (994 ng/(Pa*s*m2)).
				b.	Sto Gold Coat: 5.7 perms (327 ng/(Pa*s*m2)).
			8.	Air Leakage: Wall Assembly with Sto Gold Fill and Sto Gold Coat: ASTM E 283 (SBCCI PST & ESI Method). 0.0044 cfm/ft2 @ 75 Pa (0.000022 m3/s*m2).
			9.	Air Leakage: Sto Gold Fill: ASTM E 283 (CCMC Technical Guide Method). Less than 0.0002 ft3/min*ft2 @ 1.56psf (0.0014 L/s*m2).
			10.	Structural Integrity: ASTM E 330. 2 inches (51 mm) water pressure (positive and negative) for 1 hour. No loss of structural integrity.
			11.	Dry Tensile Strength: ASTM D 882, Sto Gold Fill:159 pli (27.8 kN/m) before aging 213 pli (37.3 kN/m) after aging.
			12.	Nail Sealability: ASTM D 1970, par 7.9.1. No water penetration at galvanized roofing nail penetration under 5 inches (127 mm) head of water after 3 days at 40 degrees F (4 degrees C). Pass over plywood and DensGlass Gold sheathing.
			13.	Flexibility: ASTM D 522, No cracking or delamination using 1/8 inch (3 mm) mandrel at 14 degrees F ( minus10 degrees C) before and after aging. No cracking or delamination before and after aging.
			14.	Tensile Adhesion ASTM C 297.
				a.	Gypsum (ASTM C 79): more than 30 psi (206 kPa).
				b.	Gypsum (ASTM C 1177): more than 30 psi (206 kPa.
				c.	Exposure 1 OSB: more than 50 psi (344 kPa).
				d.	Exterior Plywood: more than 90 psi (620 kPa).
			15.	Surface Burning: ASTM E 84.
				a.	Flame Spread: 5.
				b.	Smoke Developed: 10.
				c.	NFPA Class A, UBC Class 1 building material.
			16.	Fire Resistance: ASTM E 119. Meets criteria for 1 hour fire resistance rating when installed over I hour fire resistance rated sheathing.
			17.	Fire Propagation: UBC 26-9. No increase in fire hazard.
	1.6	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.	Verification Samples: For each finish product specified, two samples, minimum size 6 inches (150 mm) square, representing actual product, color, and patterns.
		D.	Manufacturer's Certificates: Certify products meet or exceed specified requirements.
	1.7	QUALITY ASSURANCE
		A.	Manufacturer Qualifications: Manufacturer of exterior wall waterproofing/air barrier materials for a minimum of 25 years in North America and with ISO Certification certifying manufacturer's quality management system is currently registered to ISO 9001:2000 quality standards..
		B.	Installer Qualifications: Company specializing in performing Work of this section with minimum five years documented experience.
	1.8	DELIVERY, STORAGE, AND HANDLING
		A.	Store products in manufacturer's original unopened packaging bearing manufacturer's name and identification of product until ready for installation.
		B.	Protect coatings (pail products) from freezing temperatures and temperatures in excess of 90 degrees F (32 degrees C). Store away from direct sunlight.
	1.9	COORDINATION
		A.	Coordinate installation of foundation waterproofing, roofing membrane, windows, doors and other wall penetrations to provide a continuous air barrier.
		B.	Provide protection of rough openings before installing windows, doors, and other penetrations through the wall.
		C.	Coordinate installation of head and sill flashing Specified in Section 07600 at windows and doors.
		D.	Coordinate installation of diverter flashings Specified in Section 07600 wherever water can enter the assembly to direct water to the exterior.
	1.10	PROJECT CONDITIONS
		A.	Maintain environmental conditions (temperature, humidity, and ventilation) within limits recommended by manufacturer for optimum results. Do not install products under environmental conditions outside manufacturer's absolute limits.
		B.	Maintain ambient and surface temperatures above 40 degrees F (4 degrees C) during application and drying period, minimum 24 hours after application of waterproofing/air barrier.
		C.	Provide supplementary heat for installation in temperatures less than 40 degrees F (4 degrees C) or if surface temperature is likely to fall below 40 degrees F (4 degrees C).
		D.	Provide protection of surrounding areas and adjacent surfaces from application of materials.
	PART 2	PRODUCTS
	2.1	MANUFACTURERS
		A.	Acceptable Manufacturer: Sto Corp., which is located at: 3800 Camp Creek Pkwy. Building 1400 Suite 120; Atlanta, GA 30331; Toll Free Tel: 888-786-2955; Tel: 404-346-3666; Fax: 404-346-3119; Email: request info; Web: www.stocorp.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.
	** NOTE TO SPECIFIER ** This specification includes StoGuard Waterproofing/Air Barrier Sto EmeraldCoat® and Sto Gold Coat® for application to vertical above grade concrete, concrete masonry, and sheathed wall construction. Edit this specification for the product required. Sto EmeraldCoat is specially formulated for use under stucco and other claddings. Sto Gold Coat is specially formulated for use under EIFS and other claddings Contact manufacturer for additional information.
	2.2	WATERPROOFING/AIR BARRIER
		A.	StoGuard
			1.	Trowel or Spray Applied Joint Treatment: Sto Gold Fill ready mixed acrylic based flexible joint treatment for rough opening protection and joint treatment of wall sheathing, and for minor crack repair of CMU wall surfaces.
			2.	Tape Air Barrier Connection and Joint Treatment: StoGuard Tape self adhering rubberized asphalt tape with spunbond polyester fabric facing for rough opening protection, joint treatment of wall sheathing, air barrier connections at dissimilar materials, secondary waterproof seal at sealant joints, and minor crack repair of CMU wall surfaces.
	** NOTE TO SPECIFIER ** Select one of the following Waterproof Coating product paragraphs as required. Delete the paragraphs not required.
			3.	Waterproof Coating: Sto EmeraldCoat ready mixed flexible waterproof coating for wall sheathing, concrete, and CMU wall surfaces.
			4.	Waterproof Coating: Sto Gold Coat ready mixed flexible waterproof coating for wall sheathing, concrete, and CMU wall surfaces.
	2.3	REINFORCEMENT
	** NOTE TO SPECIFIER ** Select one of the following reinforcement paragraphs as required. Delete the paragraphs not required.
		A.	StoGuard Mesh: Nominal 4.2 oz/sq. yd. (142 g/m2), self-adhesive, flexible, symmetrical, interlaced glass fiber fabric, with alkaline resistant coating for compatibility with Sto materials. For use with Sto Gold Fill to reinforce rough openings, inside and outside corners and sheathing joints.
		B.	Sto Detail Mesh: Nominal 4.2 oz/sq. yd. (142 g/m2), flexible, symmetrical, interlaced glass fiber fabric, with alkaline resistant coating for compatibility with Sto materials. For use with Sto Gold Fill to reinforce rough openings, inside and outside corners, sheathing joints, and minor cracks in concrete and masonry.
		C.	StoGuard Fabric:
	** NOTE TO SPECIFIER ** Select one of the following StoGuard Fabric paragraphs as required for use with the Waterproof Coating specified above. Delete the paragraph not required.
			1.	Non-woven integrally reinforced fabric reinforcement for use with Sto EmeraldCoat to reinforce rough openings, inside and outside corners and sheathing joints.
			2.	Non-woven integrally reinforced fabric reinforcement for use with Sto Gold Coat to reinforce rough openings, inside and outside corners and sheathing joints.
	** NOTE TO SPECIFIER ** Select the following optional reinforcement paragraph as required. Delete if not required.
		D.	StoGuard RediCorner: Preformed mesh fabric piece for use in the corners of rough openings for quicker installation.
	2.4	MIXING
		A.	Mix materials with a clean, rust-free electric drill and paddle.
		B.	Do not dilute materials with water or add other ingredients.
	PART 3	EXECUTION
	3.1	EXAMINATION
		A.	Do not begin installation until substrates and flashing installations have been properly prepared.
		B.	Inspect concrete and concrete masonry surfaces for:
			1.	Contamination including algae, chalkiness, dirt, dust, efflorescence, form oil, fungus, grease, mildew or other foreign substances.
			2.	Surface absorption and chalkiness.
			3.	Cracks; measure crack width and record location of cracks that are greater than 1/8 inch (3 mm).
			4.	Damage and deterioration.
			5.	Moisture content and moisture damage: Use a moisture meter to determine if the surface is dry enough to receive the air and moisture barrier and record any areas of moisture damage or excess moisture.
			6.	Compliance with specification tolerances: Record areas that are out of tolerance greater than 1/4 inch in 8-0 feet (6 mm in 2438 mm) deviation in plane.
		C.	Inspect sheathing application for compliance with applicable requirement:
			1.	Exterior gypsum sheathing GA-253.
			2.	Exterior Grade and Exposure I wood based sheathing APA E 30.
			3.	Glass mat faced gypsum sheathing Georgia Pacific Publication 531544.
			4.	Cementitious sheathing, Consult manufacturer's published recommendations.
	** NOTE TO SPECIFIER ** Coordinate with Drawings to verify that flashings are appropriately indicated to direct water to the exterior as required for the proper installation of the waterproofing/air barrier system. Consult with the manufacturer for additional information and recommended details.
		D.	Inspect flashings for required to direct water to the exterior including:
			1.	Flashing above window and doors heads, beneath window and door sills, at roof/wall intersections, decks, intersections of lower walls with higher walls, at the base of the wall and elsewhere are required.
		E.	If substrate preparation or flashing installation is the responsibility of another installer, notify Architect of unsatisfactory preparation before proceeding.
	3.2	PREPARATION
		A.	Clean surfaces thoroughly prior to installation.
		B.	Remove surface contaminants and replace damaged sheathing.
		C.	Spot surface defects in sheathing with joint treatment.
		D.	Repair cracks, spalls, or other damage in concrete or concrete masonry surfaces.
		E.	Prime surfaces to receive StoGuard Tape.
		F.	Prepare surfaces using the methods recommended by the manufacturer for achieving the best result for the substrate under the project conditions.
	3.3	INSTALLATION
		A.	Install in accordance with manufacturer's instructions.
	** NOTE TO SPECIFIER ** Select two component assembly or three component assembly from the following paragraphs as required. Delete the paragraph not required.
		B.	Two Component Assembly:
			1.	Reinforce, seal and repair initial air barrier components:
				a.	Cover wall sheathing joints and rough openings with StoGuard Fabric
	** NOTE TO SPECIFIER ** Select one of the following optional prefab corner reinforcement paragraph as required. Delete if not required.
				b.	Treat perimeter and edges of rough openings with RediCorner.
			2.	Apply a smooth continuous extended air barrier protection and waterproofing component with an airless sprayer, roller or brush.
	** NOTE TO SPECIFIER ** Select one of the following sealing paragraphs as required. Delete the paragraph not required.
				a.	Apply continuous Sto EmeraldCoat.
				b.	Apply continuous Sto Gold Coat.
		C.	Three Component Assembly:
			1.	Reinforce, seal and repair initial air barrier components:
				a.	Cover wall sheathing joints and rough openings with StoGuard Fabric
	** NOTE TO SPECIFIER ** Select one of the following optional prefab corner reinforcement paragraph as required. Delete if not required.
				b.	Treat perimeter and edges of rough openings with RediCorner.
			2.	Cover and seal reinforced joints with:
	** NOTE TO SPECIFIER ** Select one of the following sealing paragraphs as required. Delete the paragraph not required.
				a.	Sto EmeraldCoat.
				b.	Sto Gold Coat.
			3.	Apply a smooth continuous extended air barrier protection and waterproofing component with an airless sprayer, roller or brush.
	** NOTE TO SPECIFIER ** Select one of the following sealing paragraphs as required. Delete the paragraph not required.
				a.	Apply continuous Sto EmeraldCoat.
				b.	Apply continuous Sto Gold Coat.
		D.	Inspect completed installations to verify a smooth continuous extended air barrier protection and waterproofing covering over the entire surface without gaps, openings or other defects. Repair any defects observed.
	3.4	PROTECTION
		A.	Protect installed products until completion of project.
		B.	Touch-up, repair or replace damaged products before Substantial Completion.
	END OF SECTION