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	SECTION 07650
	FLEXIBLE FLASHING
	Copyright 2011 ARCAT, Inc. - All rights reserved
	** NOTE TO SPECIFIER ** Nervastral Inc.; exposed and concealed flexible flashing products. . This section is based on the products of Nervastral Inc., which is located at:
	100 Melrose Ave. Suite 206 Greenwich, CT 06830 Toll Free: 877-599-9891 Phone: 203-622-6030 Fax: 203-622-6009 Web Site: www.nervastral.com E-mail: nrvstrl@aol.com [ Click Here ] for additional information. Nervastral 1nc. pioneered the use of plastic thru wall flashing and membrane waterproofing over 60 years ago. Nervastral Inc. manufactures Nervastral™ 600 exposed flashings; Nervastral™ 56, Nervastral™ 300, Nervastral™ HD, and Nervastral™ HD-15 Concealed Flashings; and Nerva-Flex™ CA-454 expansion joint cover; and Nervastral™ BITU-MEM™, Nervastral™ 56, Nervastral™ 300, Nervastral™ 400, Nervastral™ HD and Nervastral Barrier Membrane Waterproofing. Contact Nervastral's engineering and technical staff for support with any special problems. Nervastral and Bitu-Mem Systems are available only through experienced, skilled and reputable contractors who have been screened and authorized by Nervastral Inc. .
	PART 1	GENERAL
	1.1	SECTION INCLUDES
	** NOTE TO SPECIFIER ** Delete items below not required for project.
		A.	Exposed Flexible trim/fascia units.
		B.	Concealed Flexible flashing.
		C.	Flexible roof/wall expansion joint systems.
		D.	Mastic for setting and sealing joints.
	1.2	RELATED SECTIONS
	** NOTE TO SPECIFIER ** Delete any sections below not relevant to this project; add others as required.
		A.	Section 04810 - Unit Masonry Assemblies.
		B.	Section 04850 - Stone Assemblies.
		C.	Section 06100 - Rough Carpentry.
		D.	Section 07311 - Asphalt Shingles.
		E.	Section 07313 - Wood Shingles and Shakes.
		F.	Section 07320 - Roof Tiles.
		G.	Section 07600 - Flashing and Sheet Metal.
		H.	Section 07920 - Sealants.
		I.	Section 15060 - Hangers and Supports: Roof curbs for mechanical equipment.
		J.	Section 16070 - Electrical Supports and Hangers: Roof curbs for electrical equipment.
	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 Vulcanized Rubber and Thermoplastic Rubbers and Thermoplastic Elastomers-Tension.
		B.	ASTM D 1004 - Standard Test Methods for Initial Tear Resistance of Plastic Film and Sheeting.
	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.	Installation methods.
		C.	Shop Drawings: Indicate material, jointing pattern, jointing details, fastening methods, flashings, terminations, and installation details
		D.	Verification Samples: For each finish product specified, two samples, minimum size 6 inches (150 mm) square, representing actual product, color, and patterns.
	1.5	QUALITY ASSURANCE
		A.	Manufacturer Qualifications: Minimum five year manufacturing experience and capability for design, engineering and technical assistance for the selection, application, and installation of appropriate flashing systems for the project.
		B.	Installer Qualifications: Experienced in the proper use and installation of flashing systems, including coordination with flashing of wall assembly components.
	** 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.
		C.	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.	Store products in manufacturer's unopened packaging until ready for installation.
		B.	Stack flashing materials to avoid twisting, bending and abrasion. Protect materials from weather before installation.
		C.	Store and dispose of solvent-based materials, and materials used with solvent-based materials, in accordance with requirements of local authorities having jurisdiction.
	1.7	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.	Coordinate work of this section with interfacing and adjoining work for proper sequencing of each installation.
	PART 2	PRODUCTS
	2.1	MANUFACTURERS
		A.	Acceptable Manufacturer: Nervastral Inc., which is located at: P. O. Box 11132 ; Greenwich, CT 06831; Toll Free Tel: 888-622-6030; Email: request info; Web: www.nervastral.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 ** Select exposed flashing, concealed flashing and roof expansion joint materials as required for the project from the following paragraphs. Delete the paragraphs for the products not required.
	2.2	MATERIALS
		A.	Elastic Sheet Flashing Materials: Nervastral elastic sheet flashing membrane, nonreinforced flexible, black elastic sheet flashing complying with the following:
			1.	Tensile Strength: ASTM D 412, 2000 psi.
			2.	Ultimate Elongation: ASTM D 412, 250 percent.
			3.	Tear Resistance: ASTM D 1004, 350 lbs. per linear inch.
			4.	Flexible over a 1/16 inch mandrel at minus 20 degrees F (minus 28.89 degrees C).
		B.	Bituminous Membrane Flashing Materials: Nervastral Bitu-Rap sheet flashing membrane, cross linked polyethylene sheet laminated to a rubber-asphalt membrane, complying with the following:
			1.	Tensile Strength: ASTM D 412, 21 pounds per inch width.
			2.	Ultimate Elongation: ASTM D 412, 350 percent.
			3.	Tear Resistance: ASTM D 1004, 350 lbs. per linear inch.
			4.	MVT: 0.2g/100 in 2nd/24 hr.
		C.	Exposed Flashing:
			1.	Nervastral 600 Elastic Sheet Flashing: Recommended for exposed flashing in place of metal. 0.0625 inch gauge, width: 12 inches to 48 inches.
	** NOTE TO SPECIFIER ** Select the concealed flashing product required from the following paragraphs. Delete the paragraphs for the products not required. Do not use concealed flashing materials for exposed flashings.
		D.	Concealed Flashing:
			1.	Nervastral 56 Elastic Sheet Flashing: Concealed Flashing, 0.056 inch gauge (1.4 mm), width: 12 inches to 48 inches (305 mm to 1219 mm).
			2.	Nervastral 300 Elastic Sheet Flashing: Concealed Flashing, 0.030 inch gauge (0.7 mm), width: 8 inches to 60 inches (203 mm to 1829 mm).
			3.	Nervastral HD Elastic Sheet Flashing: Concealed Flashing, 0.020 inch gauge (0.5 mm), width: 8 inches to 60 inches (203 mm to 1829 mm).
			4.	Nervastral HD-15 Elastic Sheet Flashing: Concealed Flashing. 0.015 inch gauge (0.4 mm), width: 12 inches to 60 inches (305 mm to 1829 mm).
			5.	Nervastral Bitu-Rap Bituminous Membrane Flashing: 40 mils (1 mm) thick.
		E.	Roof Expansion Joint Cover
			1.	Nerva-Flex CA-454: Roof Expansion Joint Cove. 0.036 CPE, 3/8 inch (9.5 mm) foam, width: 13 inches (330 mm).
		F.	Cold Setting Mastic: Nervastral Nervaplast Adhesive formulated for use with PVC flashing. Tacky, fast-grabbing semi-pressure-sensitive rubber or resin base adhesive suitable for bonding PVC sheet to itself and to a wide variety of building materials.
		G.	Roofing Cement: Cut-back asphalt containing long fibered material, in trowel grade consistency.
	2.3	FABRICATION
		A.	Forming: Fabricate flashings true to shape and accurate in dimension. Form pieces in longest possible lengths to minimize joints. Fold flashing at corners and at ends of pans instead of cutting.
		B.	Joints: Provide not less than 4 inches (100 mm) of overlap at flashing joints.
	PART 3	EXECUTION
	3.1	EXAMINATION
		A.	Do not begin installation until substrates have been properly prepared.
		B.	If substrate preparation is the responsibility of another installer, notify Architect of unsatisfactory preparation before proceeding.
		C.	Verify roof openings, curbs, pipes, sleeves, ducts, and vents through roof are solidly set, reglets in place, and nailing strips located.
	3.2	PREPARATION
		A.	Clean surfaces thoroughly prior to installation.
		B.	Prepare surfaces using the methods recommended by the manufacturer for achieving the best result for the substrate under the project conditions.
		C.	Surfaces to receive flashing shall be reasonably smooth, free from holes or other irregularities and dry to ensure proper bonding to substrate. Metal surfaces shall be free of scale, oil, grease and dust to assure a proper bond.
	** NOTE TO SPECIFIER ** Edit the following paragraphs as required for the project. Delete the paragraphs not required. Flexible flashings are used for concealed flashings around windows and doors, for water protection on sills and heads of openings, at spandrel beams, parapets, at brick masonry through wall flashings and at cavity walls. Flexible flashings are used at exposed flashings at roof parapets, roof curbs, skylights, vent pipes, perimeter curbs and expansion joints. Review Nervastral Installation Bulletins for application details. Contact manufacturer for additional information.
	3.3	INSTALLATION
		A.	Install in accordance with manufacturer's instructions.
		B.	Provide flexible flashing in the locations indicated on the Drawings.
		C.	Provide Flexible flashings for concealed flashings at the following locations:
			1.	Around windows and doors.
			2.	Water protection on sills and heads of openings.
			3.	Spandrel beams.
			4.	Parapets.
			5.	Brick masonry through wall flashings and at cavity walls.
		D.	Provide Flexible flashings for exposed flashings at the following locations:
			1.	Roof parapets
			2.	Roof equipment curbs.
			3.	Skylights.
			4.	Vent pipes.
			5.	Perimeter curbs.
			6.	Expansion joints.
		E.	Masonry Flashing: Lay horizontal flashing in slurry of fresh mortar and top with fresh full bed of mortar to receive masonry units. At vertical surfaces, spot flashing with mastic to hold in place until masonry has set.
			1.	Carry flashing through wall and leave exposed for inspection.
			2.	After inspection, cut flashing flush with surface of masonry.
			3.	Remove mortar or other obstructions from weep holes at flashing locations.
		F.	Flashing in Frame Construction: Install over solid backing, both vertically and horizontally. Secure in place with mastic; avoid puncturing installed flashing with nails or other fasteners.
		G.	Miscellaneous Flashing: Lay flashing in full trowel coat of mastic, lapping joints not less than 6 inches (150 mm). Roll surface of flashing with rubber hand roller to remove all air.
		H.	Use Nervastral Nervaplast Cold Setting Mastic with all flashing. Roofing cement may be used only at non-critical locations.
	3.4	PROTECTION
		A.	Protect installed products until completion of project.
		B.	Touch-up, repair or replace damaged Work before proceeding with construction on concealing work.
	END OF SECTION