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	SECTION 09641
	PREFINISHED HARDWOOD STRIP FLOORING
	** NOTE TO SPECIFIER ** Lumber Liquidators, Inc.; pre-finished and unfinished hardwood floors. . This section is based on the products of Lumber Liquidators, Inc., which is located at:
	3000 John Deere Rd. Toano, VA 23168
	Toll Free Te1: (800) 366-4204 Fax: (757)259-7292 E-mail: llwholesale@lumberliquidators.com Web: www.lumberliquidators.com [ Click Here ] for additional information.
	Lumber Liquidators prides itself with having one of the largest inventories of pre-finished and unfinished hardwood floors in the industry. We offer a variety of brands for residential and commercial construction, including Bellawood Pre-finished Hardwood Floors in domestic and exotic species with a 50 year pre-finish warranty. In addition to the variety of solid and engineered hardwood floors, Lumber Liquidators also carries laminate flooring, bamboo flooring, cork flooring, and butcher blocks. Lumber Liquidators negotiates directly with the mills to buy an entire years production. This tactic eliminates the middleman and allows the savings to be passed on to the customers who appreciate the "hardwood flooring for less" method of buying. The environmentally conscientious company only purchases from suppliers who practice sustainable harvesting, which allows forests to heal and re-grow faster. Lumber Liquidators is the largest independent retailer in the United States, specializing in hardwood flooring (as ranked by Floor Focus Magazine, 2006). LumberLiquidators.com was recognized as a Top 50 website by Internet Retailer in 2007. Lumber Liquidators has one of the largest inventories of pre-finished and unfinished hardwood flooring in the industry, from Birdseye maple to Bolivian rosewood to 89-cent oak! Everything Lumber Liquidators sells (unless specified otherwise) is first-quality, graded to industry specifications, and available in standard flooring lengths.
	PART 1	GENERAL
	1.1	SECTION INCLUDES
	** NOTE TO SPECIFIER** Delete type not included.
		A.	Prefinished solid hardwood strip flooring.
		B.	Prefinished engineered wood strip flooring.
	1.2	RELATED SECTIONS
	** NOTE TO SPECIFIER ** Delete any sections below not relevant to this project; add others as required. Include only sections needed to clarify responsibility for work which might be unclear otherwise.
		A.	Section 03300 - Cast-in-Place Concrete: Concrete slab to receive wood flooring.
		B.	Section 06100 - Rough Carpentry: Wood sub floor to receive wood flooring.
		C.	Section 06200 - Finish Carpentry: Wood base for wood floor.
	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.	NOFMA - National Oak Flooring Manufacturers Association Grading Standards.
	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.	Manufacturer's specifications and installation instructions for prefinished wood flooring and accessories.
			2.	Preparation instructions and recommendations.
			3.	Storage and handling requirements and recommendations.
		C.	Installer and Manufacturer Qualifications: Documentation showing compliance with manufacturer and installer qualifications specified in the Quality Assurance paragraph.
		D.	Maintenance Procedures: Manufacturer's recommended maintenance procedures and maintenance materials.
		E.	Shop Drawings: Showing roof framing, cross sections, roof and wall covering and trim details and accessory and component details clearly indicating proper assembly.
	** NOTE TO SPECIFIER ** Delete selection samples if colors have already been selected.
		F.	Selection Samples: For each finish product specified, samples illustrating grain finish, color range, and sheen representing manufacturer's full range of available colors, patterns, configurations, and finishes.
		G.	Verification Samples: For each finish product specified, three samples, minimum size 6 inches (150 mm) length, representing actual product, color, and patterns.
	1.5	QUALITY ASSURANCE
		A.	Manufacturer: Company specializing in manufacture of prefinished wood flooring with 5 years successful experience.
		B.	Installer: Company specializing in installing wood flooring with minimum 5 years successful experience.
		C.	Hardwood shall meet grading requirements of NOFMA. Provide species and grade stamp on underside of each piece of flooring. Hardwood shall be kiln dried with moisture content ranging form 6 to 9 percent. Wood Grades:
	** NOTE TO SPECIFIER ** Bellawood Hardwood Floors provides wood flooring graded in accordance with NOFMA grading standards. Flooring is provided in the following grades. Not all thickness and species are available in all three grades. Refer to Bellawood product literature for grading options. Delete grade or grades not required for project.
			1.	Select/Clear Grade: Uniform color, no knots, and longest average lengths of the three available grades.
			2.	Natural/No. 1 Grade: Variable color, some small pin knots, and some mineral coloring.
			3.	Rustic/No. 2 Grade: Varying colors, solid knots, and mineral streaks.
	1.6	DELIVERY, STORAGE, AND HANDLING
		A.	Store products in manufacturer's unopened packaging until ready for installation. Follow manufacturer's recommended handling and storage procedures.
	1.7	PROJECT CONDITIONS
		A.	Do not install wood flooring until wet construction work and majority of overhead work is completed.
		B.	Provide permanent heat, light, and ventilation prior to installation.
		C.	Maintain room temperature at 65 degrees F for 2 days prior to delivery of materials, during installation, and after installation.
		D.	Acclimatize wood flooring in accordance with period of time recommended by manufacturer. In applications in which high levels of humidity are present, extend period of time accordingly.
		E.	Anticipate 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.
	1.8	WARRANTY
		A.	Provide manufacturer's standard warranty.
	PART 2	PRODUCTS
	2.1	MANUFACTURERS
		A.	Acceptable Manufacturer: Lumber Liquidators, Inc. , which is located at: 3000 John Deere Rd. ; Toano, VA 23168; Toll Free Tel: 800-274-2360 ; Tel: 800-HARDWOOD; Email: request info; Web: www.lumberliquidators.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	MATERIALS
	**NOTE TO SPECIFIER** Bellawood Hardwood Floors as distributed by Lumber Liquidators, 1nc. provides prefinished, solid hardwood, strip flooring in three thickness - 3/8, 1/2 and 3/4 inch (10, 13 and 19 mm). Various widths, species, and grades are provided. Not all widths, species, and grades are available for all thicknesses. Refer to Bellawood product literature for available options.
		A.	Prefinished Solid Hardwood Strip Flooring:
	**NOTE TO SPECIFIER** Delete the following paragraphs 3/8 inch (10 mm) thick solid hardwood strip flooring is not required for project.
			1.	Type: 3/8 inch (10 mm) thick, prefinished, solid hardwood strip flooring.
				a.	Species:
					1)	Bolivian Rosewood.
					2)	Brazilian Cherry.
					3)	Brazilian Koa (Tigerwood).
					4)	Brazilian Mesquite.
					5)	Purple Heart.
					6)	Northern Maple.
					7)	Red Oak.
					8)	Santos Mahogany.
					9)	Golden Teak.
					10)	Brazilian Teak.
					11)	Brazilian Redwood.
				b.	Grade: Select/Clear.
				c.	Width: 3 inches (76 mm).
				d.	Length: Random lengths from 12 -72 inches (305-1829 mm) and 36 inches (914 mm) average.
				e.	Edge: Tongue and groove.
				f.	End: End matched, tongue and groove.
	**NOTE TO SPECIFIER** Delete the following paragraphs if 1/2 inch (13 mm) thick solid hardwood strip flooring is not required for project.
			2.	Type: 1/2 inch (13 mm) thick, prefinished, solid hardwood strip flooring.
				a.	Species:
					1)	Australian Cypress.
					2)	Brazilian Cherry Lite.
				b.	Grade: Natural.
				c.	Width: 3 inches (76 mm).
				d.	Length: Random lengths with 72 inches (1829 mm) maximum and (36 inches (914 mm) average.
				e.	Edge: Tongue and groove.
				f.	End: End matched, tongue and groove.
	**NOTE TO SPECIFIER** Delete the following paragraphs if 3/4 inch (19 mm) thick solid hardwood strip flooring is not required for project.
			3.	Type: 3/4 inch (19 mm) thick, prefinished, solid hardwood strip flooring.
				a.	Species:
					1)	American Cherry.
					2)	American Walnut.
					3)	Ash.
					4)	Australian Cypress.
					5)	Beech.
					6)	Birch.
					7)	Bolivian Rosewood.
					8)	Brazilian Cherry.
					9)	Brazilian Cherry Lite.
					10)	Brazilian Redwood
					11)	Brazilian Walnut.
					12)	Hickory.
					13)	Northern Maple.
					14)	Purple Heart.
					15)	Red Oak.
					16)	Santos Mahogany.
					17)	White Oak.
					18)	Brazilian Koa (Tigerwood).
					19)	Brazilian Teak.
					20)	Golden Teak.
					21)	Bloodwood.
				b.	Grade:
					1)	Select/Clear.
					2)	Natural No. 1.
					3)	Rustic No. 2.
				c.	Width:
	**NOTE TO SPECIFIER** 3/4 inch (19 mm) thick solid hardwood strip flooring is provided in 6 widths. Delete paragraphs not required for project.
					1)	Standard Width: 3-1/4 inches (83 mm).
					2)	Custom Width:
						a)	2-1/4 inches (57 mm).
						b)	4 inches (102 mm).
						c)	5 inches (127 mm).
						d)	6 inches (152 mm)
				d.	Length: Random, with the following properties
					1)	Maximum Length: 72 inches (1829 mm) maximum
	**NOTE TO SPECIFIER** Average lengths for Select/Clear and Natural No. 1 Grades are 55 inches (1397 mm). Average length of Rustic No. 2 Grade is less than 55 inches (1397 mm). Delete the following paragraph if not applicable to system selected for project.
					2)	Minimum Length 12 inches (304 mm)
					3)	Average Length 42 inches (1066 mm) *average length depends on grade and species selected .
				e.	Edge: Tongue and groove.
				f.	End: End matched, tongue and groove.
		B.	Prefinished Engineered Wood Strip Flooring:
	**NOTE TO SPECIFIER** Bellawood Hardwood Floors provides prefinished, engineered wood, strip flooring in three thicknesses - 7/16 (11 mm), 9/16 (14 mm), and 5/8 inch (16 mm). Various widths, species, and grades are provided. Not all widths, species, and grades are available for all thicknesses. Refer to Bellawood product literature for available options. **NOTE TO SPECIFIER** Delete the following paragraphs if 7/16 inch (11 mm) thick engineered wood strip flooring is not required for project.
			1.	Type: 7/16 inch 11 mm thick, prefinished, engineered wood strip flooring.
				a.	Construction: 5 ply fabricated by laminating 2 mm thick hardwood veneer ply to 4 ply wood base.
				b.	Veneer species:
					1)	American Cherry.
					2)	Brazilian Cherry.
					3)	Maple.
					4)	Red Oak.
				c.	Veneer grade: Select/Clear.
				d.	Width: 3 inches (76 mm).
				e.	Length: Random lengths with 72 inches (1829 mm) maximum and 36 inches (914 mm) average.
				f.	Edge: Tongue and groove.
				g.	End: End matched, tongue and groove.
	**NOTE TO SPECIFIER** Delete the following paragraphs if 9/16 inch (14 mm) thick engineered three strip wood flooring is not required for project.
			2.	Type: 9/16 inch (14 mm) thick, prefinished, engineered, 3 strip wood flooring.
				a.	Construction: 4 ply fabricated by laminating 3.5 mm hardwood veneer ply to 3 ply wood base. Veneer ply to consist of 3 equal wood strips.
				b.	Veneer species:
					1)	Brazilian Cherry.
					2)	Maple.
					3)	Red Oak.
					4)	Horizontal Natural Bamboo.
					5)	Horizontal Carbonized Bamboo.
				c.	Veneer grade: Select/Clear.
				d.	Width: 7 inches (178 mm).
				e.	Length: 72 inches (1829 mm).
				f.	Edge: Tongue and groove.
				g.	End: End matched, tongue and groove.
	**NOTE TO SPECIFIER** Delete the following paragraphs if 5/8 inch (16 mm) thick engineered bamboo strip flooring is not required for project.
			3.	Type: 5/8 inch (16 mm) thick, prefinished, engineered bamboo strip flooring.
				a.	Construction: 3 ply solid bamboo strip flooring fabricated with hot glue mechanical press process.
				b.	Bamboo type, color and pattern:
	**NOTE TO SPECIFIER** There are four types of bamboo - vertical natural, horizontal natural, vertical carbonized, horizontal carbonized. Carbonized is a staining process producing a brown tint. Delete options below not required for project
					1)	Vertical natural.
					2)	Horizontal natural.
					3)	Vertical carbonized.
					4)	Horizontal carbonized.
				c.	Width: 3-5/8 inches (92 mm).
				d.	Length:
					1)	36 inches (914 mm).
	**NOTE TO SPECIFIER** Standard length of bamboo engineered wood strip flooring is 36 inches (914 mm). Horizontal natural bamboo is also provided in 72 inches (1829 mm) lengths. Delete the following paragraph if not required for project
				e.	Edge: Tongue and groove.
				f.	End: End matched, tongue and groove.
	2.3	FINISHES
		A.	Factory Finishing:
			1.	Factory machine sand hardwood strip flooring to smooth even finish with no evidence of sander marks. Use 3 sequential sanding operations.
			2.	Apply one seal coat followed by 7 finish coats of photoreactive urethane. Cure by ultra-violet light. 5 finish coats shall be aluminum oxide based.
			3.	Total finish thickness; 3.2 mils.
	** NOTE TO SPECIFIER ** Edit this article to include materials required for specific wood flooring installation. Delete non-applicable materials.
	2.4	ACCESSORIES
		A.	Refer to manufacturer's literature for thickness of subfloor based on joist spacing. Acceptable subfloor materials include particle board, oriented strand board and AdvanTech, depending on application. Particleboard and Masonite: not an acceptable substrate.
		B.	Wood sleepers, plywood sheathing, blocking, and other framing accessories:
			1.	As specified in Section 06100 - Rough Carpentry.
			2.	Do not use pressure-treated wood products.
		C.	Subfloor filler and patching compound:
			1.	Gray cement based type as recommended by flooring manufacturer.
			2.	Tri-Patch as manufactured by Mapei Corporation.
		D.	Wood floor adhesive:
	** NOTE TO SPECIFIER ** Mapei Ultrabond 990 for use with solid wood flooring. Use Mapei 975 for engineered flooring. Delete adhesives not required.
			1.	100 percent urethane floor adhesive as recommended by flooring manufacturer.
			2.	Mapei Ultrabond 990 as manufactured by Mapei Corporation.
			3.	Mapei 975 as manufactured by Mapei Corporation.
	** NOTE TO SPECIFIER ** Type of vapor retarder used will depend on project conditions and construction of substrate The following type vapor barrier is applicable for raised wood flooring installed above a crawl space. Delete if not required.
		E.	Sheet vapor retarder: Black polyethylene sheeting, 8 mils thick. Provide reinforced, self-adhesive, 2 inches (51 mm) minimum width tape for sealing seams.
	** NOTE TO SPECIFIER ** The following type of vapor barrier is applicable for wood flooring installed with adhesive. Delete of not required.
		F.	Trowel applied vapor retarder: Planiseal WFM as manufactured by Mapei Corporation.
	** NOTE TO SPECIFIER ** The following type of vapor barrier is applicable for nailed wood flooring.
		G.	Underlayment: Asphalt impregnated, weather resistant, water-vapor permeable building felt paper.
			1.	Dry tensile strength: 20 psi minimum in both directions.
			2.	Maximum water vapor transmission: 35 grams per square meter per 24 hours.
	** NOTE TO SPECIFIER ** Cork or compressed fiber underlayment can be installed beneath wood flooring for sound isolation. Include and edit the following paragraph if sound isolation underlayment is required.
		H.	Sound isolation underlayment:
			1.	3 mm thick cork underlayment.
			2.	6 mm thick cork underlayment.
			3.	3 mm compressed fiber underlayment.
			4.	6 mm thick compressed fiber underlayment.
			5.	Insulayment as manufactured by Lumber Liquidators.
	PART 3	EXECUTION
	3.1	EXAMINATION
		A.	Verify that site conditions are acceptable for installation of prefinished wood flooring system.
		B.	Do not begin installation until substrates have been properly prepared.
		C.	If substrate preparation is the responsibility of another installer, notify Architect of unsatisfactory preparation before proceeding.
	** NOTE TO SPECIFIER ** Contact Lumber Liquidators for assistance in determining installation method. Wood flooring is typically installed over a wood subfloor with staples or nails. There are also several methods for installing wood flooring on a concrete slab using a plywood nailing base and a moisture barrier. These include the following: Platform sleeper system: 2 by 4 wood sleepers are installed around the perimeter and in the field at 12 inches (305 mm) on center and covered with sheet vapor barrier and plywood sheathing. Adhered plywood nailing base: Fluid applied vapor barrier is installed on concrete slab. Scored plywood sheets or 12 inch (305 mm) wide plywood planks are adhered to concrete slab. Asphalt felt ply and wood flooring are then installed with staples or nails. Floating plywood nailing base: Sheet vapor barrier is installed over concrete slab and two layers of 5/8 inch (16 mm) thick plywood sheathing are screwed together over the slab and vapor barrier. Asphalt felt ply and wood flooring are then installed with staples or nails. Mechanically fastened plywood nailing base: 3/4 inch (19 mm) exterior grade plywood panels are anchored to an above grade concrete slab with power-actuated fasteners. Asphalt felt ply and wood flooring are then installed with staples or nails. Wood flooring can also be applied with adhesive over concrete substrates. Lumber Liquidators does not recommend this method for solid 3/4 inch (19 mm) hardwood flooring nor do they recommend wood flooring be installed below-grade in basements. 3/8 inch (9.5 mm), 5/16 inch (8 mm) and 1/2 inch (13 m) solid hardwood floors can be applied over concrete. Only certain species of wood flooring are suitable for installation above radiant floor heating floor. Consult Lumber Liquidators before specifying adhesive installation of wood flooring or installation over radiant floor heating systems.
	3.2	PREPARATION
		A.	Before installation, acclimate the new flooring in the areas in accordance with manufacturer's instructions specific to wood species selected. Consistent indoor temperatures of 60o-80o F and constant indoor humidity levels of 35% - 55% are required during period of acclimitization. Very dry or humid regions may require extended conditioning. Excessive squeaks and gapping can result from poor or no acclimation.
				a.	10-14 days for most dense exotic species.
				b.	2 - 7 days for domestic (North American) species.
		B.	If particleboard or masonite subfloor is present, cover or replace with 3/8 inch (9.5 mm) plywood, oriented strand board, or AdvanTech.
	** NOTE TO SPECIFIER ** Include the following paragraph if wood flooring is installed over wood substrate. Delete if not required.
		C.	Coordinate installation of wood flooring with construction of wood subfloor specified in Section 06100 - Rough Carpentry. Ensure that framing members are rigid and subfloor is level, smooth, and securely attached with ends over firm bearing.
	** NOTE TO SPECIFIER ** Include the following paragraph if wood flooring is installed over concrete substrate. Delete if not required.
		D.	Coordinate installation of wood flooring with construction of concrete substrate specified in Section 03300 - Cast-in-Place Concrete.
	** NOTE TO SPECIFIER ** Include the following paragraph if concrete slab is recessed so that wood flooring is flush with adjacent floor finishes. Delete if not required.
	3.3	Coordinate required depth of recess with installation of concrete subfloor so that wood flooring is flush with adjacent floor finishes.
	3.4	Prior to installation, inspect concrete substrate to determine existence of moisture, major cracking or settlement, deterioration of concrete, oil, grease, and other deficiencies which might adversely affect installation of wood flooring. Ensure:
		A.	Concrete shall be completely cured, 90 days cure time minimum.
		B.	Moisture content of substrate shall be within 2 percent of wood flooring (for widths 3-1/4 inches (83 mm) and wider, and within 4 percent for 2-1/4 inches (57 mm) width boards) to be installed. Test concrete using CC test and verify moisture does not exceed 3 pounds per 1,000 square feet (14.65 kg per 1,000 square meters in 24 hours.
		C.	Verify for slabs scheduled to receive nailing base or wood flooring installed adhesive that:
			1.	Concrete sealer has not been applied.
			2.	Concrete slab has neutral alkalinity.
		D.	Concrete surfaces shall be smooth, flat, and free from irregularities. Maximum acceptable variation in any direction shall be 3/16 inch in 10 feet (5 mm in 3 m).
	3.5	Fill low spots, cracks, joints, holes, and other defects with floor filler. Apply, trowel, and float filler to leave smooth, flat, hard surface. Prohibit traffic until cured.
		A.	Report deficiencies to Architect and do not proceed with flooring installation until resolution.
		B.	Vacuum or broom clean floor surfaces immediately before installation.
	** NOTE TO SPECIFIER ** Include and edit this Article if wood flooring is attached to a wood nailing base installed on a concrete substrate. Delete if not required.
	3.6	INSTALLATION OF NAILING BASE
	** NOTE TO SPECIFIER ** Include the following paragraph to specify a platform sleeper nailing base. Delete if not required.
		A.	Platform Sleeper Nailing Base: Construct platform sleeper nailing base to receive wood flooring:
			1.	Install framing of nominal 2 by 4 wood sleepers with 6 to 9 percent moisture content laid flat:
				a.	Install around the perimeter of wood floor. Position members 1/2 inch (13 mm) from walls.
				b.	In field, lay sleepers at 12 inches (305 mm) on center.
				c.	Glue sleepers to concrete slab.
			2.	Install plastic sheet vapor barrier under sub-floor framing. Lap seams 6 inches (152 mm) and tape.
			3.	Install 3/4 inch (19 mm) thick exterior grade plywood sheathing on sub-floor framing over vapor barrier.
			4.	Prior to installation of wood flooring, install one ply of asphalt felt underlayment.
	** NOTE TO SPECIFIER ** Include the following paragraph to specify an adhered plywood nailing base. Delete if not required.
		B.	Adhered Plywood Nailing Base: Install an adhered plywood nailing base to receive wood flooring:
			1.	Trowel apply vapor barrier over concrete slab to receive plywood nailing base. Apply in accordance with manufacturer's instructions and allow to cure 16 hours minimum.
			2.	Prepare 48 by 96 inches (1219 by 2348 mm) by 3/4 inch (19 mm) thick exterior grade plywood as follows:
	** NOTE TO SPECIFIER ** In order for the plywood nailing base to form tight to the contours of the concrete slab and to prevent warping or curling, the plywood sheets can be scored on the back side. As an alternative, the plywood can be cut into 12 inch (305 mm) wide boards. Delete method not required.
				a.	Score backside of plywood at 8 inches (203 mm). Use circular saw set to cut one half the thickness of the plywood.
				b.	Cut plywood into 12 by 96 inches (305 by 2348 mm) boards.
			3.	Use 1/4 by 1/4 inch (6 by 6 mm) square notched trowel to apply 100 percent urethane adhesive.
			4.	Set plywood into wet adhesive. Use weights to hold in place.
			5.	Allow adhesive to fully cure before installing wood flooring.
			6.	Prior to installation of wood flooring, install one ply of asphalt felt underlayment.
	** NOTE TO SPECIFIER ** Include the following paragraph to specify a floating plywood nailing base.
		C.	Floating Plywood Nailing Base: Install a floating plywood nailing base to receive wood flooring:
			1.	Lay polyethylene sheet vapor barrier over concrete substrate. Overlap seam 6 inches (152 mm) and seal with tape.
			2.	Lay one layer of 5/8 inch (16 mm) thick exterior grade plywood over vapor barrier.
			3.	Lay second layer of 5/8 inch (16 mm) thick exterior grade plywood on a diagonal over first plywood layer.
			4.	Provide 1/8 inch (3 mm) between all sides or adjoining square edged plywood panels.
			5.	Screw plywood layers together in a 6 inch (152 mm) pattern. Exercise care not to puncture sheet vapor barrier.
			6.	Prior to installation of wood flooring, install one ply of asphalt felt underlayment.
	** NOTE TO SPECIFIER ** Include the following paragraph to specify a mechanically fastened nailing base. Delete if not required.
		D.	Mechanically Fastened Plywood Nailing Base: Install a mechanically fastened plywood nailing base over vapor barrier to receive wood flooring:
	** NOTE TO SPECIFIER ** Either a plastic sheet or trowel applied vapor barrier can be installed beneath the plywood nailing base depending on type of sub-floor. Delete vapor barrier not required.
			1.	Vapor Barrier: Install plastic sheet vapor barrier under wood subfloor. Lap seams 6 inches (152 mm) and tape.
			2.	Vapor Barrier: Trowel apply vapor barrier over concrete sub-floor. Apply in accordance with manufacturer's instructions and allow to cure 16 hours minimum.
			3.	Loose lay 3/4 inch (19 mm) thick exterior grade plywood over floor on a diagonal to direction of finished floor.
				a.	Stagger joints between sheets 48 inches (1219 mm).
				b.	Leave 3/4 inch (19 mm) space at perimeter walls and 1/8 inch (3 mm) space between panels.
				c.	Cut plywood to fit under door jambs and within 1/8 inch (3 mm) of obstructions.
			4.	Fasten plywood with powder-actuated concrete nails or hammer-driven concrete nails.
				a.	Use 9 nails minimum per plywood panel.
				b.	Start nailing at center of plywood panel and work toward edges.
			5.	Prior to installation of wood flooring, install one ply of asphalt felt underlayment.
	** NOTE TO SPECIFIER ** Delete paragraphs from the following article to customize application to substrate condition of project.
	3.7	WOOD FLOORING INSTALLATION
		A.	Install flooring in accordance with manufacturer's instructions and approved shop drawings.
		B.	When installation to occur in high humidity area, allow wood flooring to acclimatize for an extended period, as recommended by manufacturer according to species specified.
		C.	Intermingle board lengths.
		D.	Stagger board ends 3 times board width or 6 inches (152 mm) minimum.
		E.	Select wood boards from several cartons to ensure good color and shade mixture.
		F.	Allow 3/4 inch (19 mm) voids, or voids equal to the thickness of the flooring, for expansion and movement of wood flooring at walls and permanent obstructions.
		G.	Do not install flooring directly over joists without subflooring.
		H.	Use joist spacing to determine minimum subfloor thickness.
		I.	All structural panels/underlayment to be installed sealed-side down. Provide 3/4 inch (19 mm) perimeter spacing.
		J.	Square-edged or non tongue and grooved panels used as a subfloor require a minimum 1/8 inch (3 mm) expansion space between all plywood seams.
		K.	Panels must meet minimum CDX grade Exposure 1 and US Voluntary Product Standard PS1-95, PS2-04 or Canadian performance standard CAN/CSA 0325-0-92 for construction sheathing. Code must be stamped on underside of all panels used. Minimum of 3/8 inch (9.5 mm) panel thickness when used as an underlayment.
	** NOTE TO SPECIFIER ** Delete if not required.
		L.	For large wood floor areas, 30 feet by 30 feet (10 m by 10 m) or high humidity conditions provide center expansion gaps by inserting washers as temporary spacers in accordance with manufacturer's instructions.
	** NOTE TO SPECIFIER ** Include the following two paragraphs if wood flooring is installed by nailing and stapling. Delete if not required.
		M.	Lay hardwood strip flooring on underlayment over wood subfloor or wood nailing base and parallel with length of room and perpendicular to wood joists.
		N.	Blind staple or nail flooring to subfloor with appropriate flooring nailer or stapler:
			1.	Space fasteners at 6 to 8 inches (152 to 203 mm). Fasteners shall not be installed within 2 inches (50 mm) of board ends to avoid splitting.
			2.	Fasteners shall be driven at an angle from the top of the tongue of the flooring board.
			3.	Ensure that the flooring nailer or stapler is adjusted to insert fastener at proper angle and is set to the proper depth for flooring being installed to prevent splitting and damage to finished wood surface.
			4.	Where clearance does not permit blind nailing with flooring nailer, pre-drill holes and top nail on the tongue side of the board.
	** NOTE TO SPECIFIER ** Delete nail spacing not required.
			5.	Solid Wood Flooring:
				a.	For 2 1/4 inch (57 mm), 3/4 inch (19 mm) thick, flooring nail placement is every 8"-10 apart and a nail placed within 1 inch to 3 inches (25 mm to 76 mm) of each end, with at least two nails in every board.
				b.	For flooring 3 inches (76 mm) wide: 3/4 inch (19 mm) thick the nail placement should be 6 inches to 8 inches (152 mm to 203 mm) apart and there should be a nail placed within 1 inch to 3 inches (25 mm to 76 mm) from each end, with at least two nails in every board
				c.	Flooring 4 inches to 8 inches (102 mm to 203 mm) wide, 3/4 inch (19 mm) thick the nail placement should be 6 inches to 8 inches (152 mm to 203 mm) apart and there should be a nail placed within 1 inch to 3 inches (25 mm to 76 mm) from each end, with at least two nails in every board
				d.	Flooring 5/16 inch to 3/8 inch (8 mm to 9.5 mm) thick the nail placement should be 4 inches to 8 inches (102 mm to 203 mm) apart and there should be a nail placed within 1 inch to 3 inches (25 mm to 76 mm) from each end, with at least two nails in every board
				e.	Flooring 1/2 inch (12 mm) thick the nail placement should be 10 inches (254 mm) apart and there should be a nail placed within 1 inch to 3 inches (25 mm to 76 mm) from each end, with at least two nails in every board.
			6.	Engineered Wood Flooring:
				a.	Place staples in 3 inch to 4 inch (76 mm to 102 mm) intervals, or 4 inches to 6 inches (102 mm to 152 mm) for cleat nails and within 1 inch to 2 inches (25 mm to 51 mm) of board ends, with at least two fasteners in every board.
			7.	Bamboo Wood Flooring:
				a.	1/2 inch and 5/8 inch (12 mm and 16 mm) thick flooring, place fasteners in 10 inch to 12 inch (254 mm to 305 mm) intervals and within 3 inches to 4 inches (76 mm to 102 mm) of board ends, with at least two fasteners in every board.
	** NOTE TO SPECIFIER ** Include the following four paragraphs if adhesive installation method is used. This installation method should be used for 5/16, 3/8 and 1/2 inch (8 mm, 10 mm, and 13 mm) thick maximum wood strip flooring. Delete if not required.
		O.	Apply 100 percent urethane vapor barrier to concrete slab. Trowel apply vapor in accordance with manufacturer's instructions and allow to cure 16 hours minimum.
		P.	Spread adhesive on concrete substrate with appropriate notched trowel. Spread only enough adhesive to permit installation of flooring materials before initial set. Follow glue manufactures recommendations for "flash off" time, trowel sizes and use of floor roller.
		Q.	Adhere wood flooring strips without cracks and voids. Ensure that each flooring strip is completely adhered to substrate. Ensure a 95 percent transfer.
		R.	Immediately remove excess adhesive from pre-finished surface of wood flooring.
	3.8	INSTALLATION OF TRIM AND MOLDINGS
		A.	Install wood moldings and trim pieces of types shown and detailed on Drawings and reviewed shop drawings.
		B.	Preparation: Acclimate wood moldings and trim 48 hours minimum. Pre-drill pieces to be secured by nails to avoid splitting.
		C.	Cut moldings and trim pieces with motorized miter saw with carbide tipped blade.
		D.	When installing base or quarter round moldings, attach to wall to avoid restricting expansion and contraction of wood flooring.
		E.	When splicing moldings and trim, miter cut rather than square cut.
		F.	Counterset nails and fill holes with wood filler colored to match prefinished trim or molding color.
		G.	Stair nosings shall be nailed and glued for safety.
	3.9	CLEANING AND PROTECTION
		A.	Remove unused materials and debris. Clean floor surface. Use cleaning products recommended by flooring manufacturer for urethane floors.
		B.	Protect completed wood flooring from construction operations with heavy paper or plywood sheets installed over walkways. Take necessary precautions to eliminate damage from dropped objects. Use breathable materials to cover installed wood flooring. Do not completely cover installed wood flooring, as moisture and color shading issues may arise.
		C.	Instruct Owner's designated representatives in wood flooring maintenance.
	END OF SECTION