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	SECTION 07315
	SLATE SHINGLES
	NOTE ** Echeguren Slate, Inc. natural slate roofing shingles, and underlayments and flashings.
	NOTE ** This section is based on slate roofing shingles as furnished by Echeguren Slate, 1nc., which can be contacted at: NOTE ** 1495 Illinois St. NOTE ** San Francisco, CA 94107 NOTE ** Te1: (415) 206-9343 NOTE ** Fax: (415) 206-9353 NOTE ** www.echeguren.com NOTE ** NOTE ** Slate is the classic, elegant, and prestigious way to roof. In addition to distributing the standard high grade slates of Vermont and New York, Echeguren Slate, 1nc. imports and stocks a large array of attractively colored slates from China, Europe, and Africa.
	NOTE **
	PART 1	GENERAL
	1.1	SECTION INCLUDES
	NOTE ** Delete items below not required for project.
		A.	Slate roofing shingles.
		B.	Moisture shedding underlayment.
		C.	Metal roof flashing.
		D.	Roofing cant and nailing strips.
		E.	Roofing nails.
	1.2	RELATED SECTIONS
	NOTE ** Delete any sections below not relevant to this project; add others as required.
		A.	Section 06100 - Rough Carpentry: Framing and Sheathing.
		B.	Section 06150 - Wood Decking.
		C.	Section 07600 - Flashing and Sheet Metal.
		D.	Section 08620 - Unit Skylights.
	1.3	REFERENCES
	NOTE ** Delete references from the list below that are not actually required by the text of the edited section.
		A.	ASTM A 167 - Standard Specification for Stainless and Heat-Resisting Chromium-Nickel Steel Plate, Sheet, and Strip.
		B.	ASTM B 370 - Standard Specification for Copper Sheet and Strip for Building Construction.
		C.	ASTM B 749 - Standard Specification for Lead and Lead Alloy Strip, Sheet, and Plate Products.
		D.	ASTM C 406 - Standard Specification for Roofing Slate.
		E.	ASTM C 920 - Standard Specification for Elastomeric Joint Sealants.
		F.	ASTM C 1085 - Standard Specification for Butyl Rubber-Based Solvent-Release Sealant.
		G.	ASTM D 226 - Standard Specification for Asphalt-Saturated Organic Felt Used in Roofing and Waterproofing.
		H.	ASTM D 1970 - Standard Specification for Self-Adhering Polymer Modified Bituminous Sheet Materials Used as Steep Roofing Underlayment for Ice Dam Protection.
		I.	ASTM D 2626 - Standard Specification for Asphalt-Saturated and Coated Organic Felt Base Sheet Used in Roofing.
		J.	NRCA MS104 - The NRCA Steep Roofing Manual; National Roofing Contractors Association.
	1.4	SUBMITTALS
		A.	Submit under provisions of Section 01300.
		B.	[ [ Product Data ] ]: Provide distributor's printed information on material characteristics and application limitations.
		C.	Installation Instructions: Include distributor's recommendations for substrate preparation and installation of roofing system and related accessories.
		D.	Shop Drawings: Details for specially configured metal flashing, jointing methods and locations for flashing, and other roofing system details.
		E.	Selection Samples: Pieces of actual shingle, illustrating complete range of colors available, for Architect's selection.
		F.	Verification Samples: Actual shingle in color selected, illustrating full range of color variation to be expected in finished work.
	1.5	QUALITY ASSURANCE
		A.	Installer Qualifications: Company specializing in installing slate roofing of the type specified in this section, with not fewer than three years of documented experience.
	1.6	DELIVERY, STORAGE, AND HANDLING
		A.	Deliver shingles to project site in distributor's unopened cartons, labeled with data indicating source.
		B.	Handle shingles to prevent chipping, breakage, soiling, or other damage. Protect edges with wood or other rigid material.
		C.	Place and stack skids and slate cartons to distribute weight evenly and to prevent breakage or cracking.
	1.7	MAINTENANCE MATERIALS
		A.	See Section 01600 - Product Requirements, for additional provisions.
		B.	Provide an additional 3 percent of installed shingles, but not less than one full carton, for Owner's use in roof maintenance.
	PART 2	PRODUCTS
	2.1	MANUFACTURERS
		A.	Provide slate as furnished by Echeguren Slate, 1nc.; 1495 Illinois Street; San Francisco, CA 94107. ASD. Te1: (415)206-9343. Fax: (415)206-9353. www.echeguren.com.
		B.	Requests for substitutions will be considered in accordance with provisions of Section 01600.
	NOTE ** Delete paragraph above or below; coordinate with Division 1 requirements.
			1.	Substitutions: Not permitted.
	2.2	SHINGLES
	NOTE ** Select from options below and delete others.
		A.	Slate Shingles: Hard, dense, sound rock, punched or drilled for two nails each, sorted to eliminate any that have been cracked or broken.
		B.	Source: Obtain slate required for the project from a single quarry, with consistent color range and texture throughout.
	NOTE ** Slate grades are determined in ASTM C 406 by measuring the water absorption and softening of the slate under test conditions. These tests are an indicator of the expected life span. Grade S1 is the best, with an expected life of over 75 years. Grade S2 has an expected life of 40 to 75 years, and Grade S3 has an expected life of 20 to 40 years. Select one grade description below and delete the others. Be sure the slate color and source selected are available in the grade specified.
			1.	Grade: ASTM C 406 Grade S1 or upper limits of S2.
			2.	Grade: ASTM C 406 Grade S2 or better.
			3.	Grade: ASTM C 406 Grade S3 or better.
	NOTE ** Delete all but one thickness description.
			4.	Thickness: Nominal 3/16 in (5 mm). Thickness: Nominal 1/4 in (6 mm).
			5.	Thickness: Nominal 3/8 in (9 mm).
			6.	Thickness: _______________.
	NOTE ** The most common sizes are 16 inch length and 8, 10, and 11 inch widths. Some American slates are available in sizes up to 24 in. x 12 in. For specific sizes in particular varieties, see Echeguren's website at www.echeguren.com.
			7.	Size: 16 in (400 mm) length by 8 in (200 mm) width.
			8.	Size: 16 in (400 mm) length by 10 in (250 mm) width.
			9.	Size: 16 in (400 mm) length by 11 in (275 mm) width.
			10.	Size: _________________.
			11.	Butt shape: Standard square cut.
			12.	Butt shape: ________________.
			13.	Color: Black.
			14.	Color: Blue-black.
			15.	Color: Grey.
			16.	Color: Blue-grey.
			17.	Color: Purple.
			18.	Color: Green.
			19.	Color: Red.
			20.	Color: Silver-black.
			21.	Color: As selected by Architect from standard range.
			22.	Color: _______________.
	2.3	UNDERLAYMENT
	NOTE ** Select one of the following underlayments for roofs pitched at least 4 inches per foot. Slate roofing is not recommended for roofs with less than a 4 in 12 slope.
		A.	Underlayment: ASTM D 1970, self-adhering rubberized asphalt membrane with high traction surface, internal reinforcement, and back plastic release film.
		B.	Underlayment: ASTM D 2626; one layer of No.40 coated base sheet.
		C.	Underlayment: ASTM D 226; two layers of No.30 asphalt impregnated roofing felt.
	2.4	SHEET METAL FLASHING
	NOTE ** Select one of the following flashing materials and delete the others, unless you intend to leave all types for Contractor's selection.
		A.	Flashing: Terne coated stainless steel; 0.015 inch (0.38 mm) thick stainless steel core material complying with ASTM A 167, Type 304; coated with 0.092 lb/sq ft (450 g/sq m) terne alloy on both sides of core metal.
		B.	Flashing: ASTM B 370 copper, cold rolled, 16 oz/sq ft (0.56 mm thick), natural finish.
		C.	Flashing: Lead sheet, 2.5 lb/sq ft (1 mm thick); complying with ASTM B 749.
	2.5	ACCESSORIES
		A.	Nails for Plywood Sheathing: Slater's copper ring shank nail, 11 gage (3 mm), not less than 1-3/4 inches (45 mm) long with 3/8 inch (9.5 mm) head; point must penetrate through underside of deck.
		B.	Wood Nailers and Cant Strips: Preservative-treated wood, as specified in Section 06114.
		C.	Plastic Cement: ASTM C 1085, one-part non-sag polymerized butyl sealant.
		D.	Sealant: ASTM C 920 silicone, low modulus.
	2.6	FLASHING FABRICATION
		A.	Form flashing to profiles indicated on drawings and as required to protect roofing materials from physical damage and shed water.
		B.	Form sections square and accurate in profile, in maximum possible lengths, free from distortion or defects detrimental to appearance or performance.
	PART 3	EXECUTION
	3.1	EXAMINATION
		A.	Verify that roofing penetrations and plumbing stacks are in place and properly flashed to deck surface.
		B.	Verify that roof openings are correctly framed.
		C.	Verify that deck surfaces are dry and free of ridges, warps, and voids.
	3.2	PREPARATION
	NOTE ** A minimum deck of 15/32 inch (12 mm) APA approved plywood roof decking or 1-inch (25 mm) nominal thickness, well seasoned tongue-and groove wood sheathing boards should be used for slate roofing. A 3/4 inch (19 mm) thick APA approved plywood deck is recommended, but not required, for superior nail and screw fastening.
	TE ** If sheathing boards are used, they must not be over 6 inches (152 mm) in width and must be fastened to each rafter with not less than two 8d nails.
		A.	Comply with shingle manufacturer's recommendations on preparation of acceptable roof deck.
		B.	Broom clean deck surfaces prior to installation of underlayment.
	3.3	INSTALLATION
		A.	Underlayment:
			1.	Install underlayment over entire deck surface. At hips, valleys, and ridges, install additional 36 inch (915 mm) width of underlayment, centered on the valley or ridge. Ice Dam Protection: Apply additional layer of underlayment at eaves that are subject to icing and back-up of water. Apply from roof edge to a line that when projected to the horizontal is not less than 24 inches (610 mm) inside of interior wall line. On overhanging eaves that require more than a single 36-inch (915 mm) width of underlayment, overlap not less than 6 inches (152 mm), assuring that overlapped area is located on overhang, outside wall line.
		B.	Sheet Metal Flashing: Install as indicated and in compliance with details and recommendations of NRCA MS104.
			1.	Install flashing at all locations where roof intersects other roofs, sidewall or parapet walls, chimneys, ventilators, and similar projections, and at gable edges.
	NOTE ** Select open or closed valley construction, or delete both if roof has no valleys. Do not use open valleys in very cold conditions, because there are exposed edges for ice to grip -- use closed valleys instead.
			2.	Open Valley: Install minimum 20 inch (510 mm) wide open valley metal flashing over 36-inch (915 mm) wide underlayment, with field underlayment lapped over edges of flashing not less than 4 inches (100 mm) . Fasten metal with cleats. Overlap metal a minimum of 5 inches (130 mm).
			3.	Closed Valley: Install closed valley metal flashing over 36-inch (915 mm) wide underlayment by interleaving shingles with minimum 20-inch (510 mm) wide prepared metal flashing sheets. Attach shingles using copper wires to copper straps nailed beyond the top edge of the metal flashing.
		C.	Wood Nailer and Cant Strips:
			1.	Cant strip: Install nominal 1 inch by 2 inches by 48 inches (25 mm by 50 mm by 1220 mm) wood cant strips at eaves. Apply eave flashing and underlayment over cant strip.
			2.	Cant Strip: Install nominal 1 inch by 2 inches by 48 inches (25 mm by 50 mm by 1220 mm) pressure-treated wood cant strips directly over underlayment at eaves, spacing 1 inch (25 mm) apart for drainage.
			3.	Nailers: Install nominal 1 inch by 2 inches by 48 inches (25 mm by 50 mm by 1220 mm) pressure-treated wood nailers as detailed at ridge and hips, directly over underlayment. Protect with additional layer of underlayment before installing hip and ridge accessory.
		D.	Shingles: Comply with details and recommendations of NRCA MS104.
			1.	Double shingles at eaves and cornice line. Beginning at eaves, project shingle 2 inches (50 mm), and lay shingles in horizontal courses. Provide at least a 3 in (75 mm) head lap between succeeding courses of shingles and stagger joints between courses a minimum of 3 inches (75 mm). Provide 1 inch (25 mm) projection of shingles at gables.
			2.	Cut and fit shingles neatly around vents, pipes, ventilators, and other roof projections
			3.	Nail shingles so nail heads touch shingle lightly, without producing strain on the slate. Install shingles at ridges and hips in saddle pattern. Lay ridge and hip shingles in plastic cement spread generously over unexposed portions of lower courses and nail in place, covering heads of exposed nails with plastic cement.
	3.4	PROTECTION
		A.	Minimize traffic over finished roof surface. If necessary, wear soft-soled shoes and walk on the "butt" of the shingles in order to avoid breakage.
	END OF SECTION