SECTION WOOD STRIP FLOORING

Transcription

1 SECTION WOOD STRIP FLOORING PART 1 GENERAL 1.1 GENERAL REQUIREMENTS A. Work of this Section, as shown or specified, shall be in accordance with the requirements of the Contract Documents. 1.2 SECTION INCLUDES A. Work of this Section includes all labor, materials, equipment, and services necessary to complete the wood strip flooring, as shown on the drawings and/or specified herein, including, but not limited to, the following: 1. Wood strip flooring 2. Plywood subflooring. 3. Accessories, including acoustical underlayment. 4. Field finishing of wood flooring. 1.3 RELATED SECTIONS A. Concrete slab - Section B. Carpentry - Section QUALITY ASSURANCE A. Installer Qualifications: Specialized wood flooring firm with not less than three (3) years successful experience in installation of types specified, and acceptable to manufacturer of wood flooring. B. General Standard: Comply with recommendations of National Wood Flooring Association (NWFA) Installation Guidelines. C. Source Quality Control: Obtain flooring of each type from single manufacturer or source, to ensure match of quality, color, pattern and texture. D. Field-Constructed Mock-Up: Prior to installing wood flooring and trim, construct mock-ups for each form of construction and finish required to verify selections made under Sample submittals and to demonstrate aesthetic effects and qualities of materials and execution. Build mock-ups to comply with the following requirements, using materials indicated for completed work. 1. Build mock-ups of wood flooring and each type of trim, in the form, dimensions, and location designated by the Architect. WOOD STRIP FLOORING

2 2. Notify Architect one week in advance of the dates and times when mock-ups will be erected. 3. Demonstrate the proposed range of aesthetic effects and workmanship. 4. Modify or reinstall mock-ups as required to obtain Architect's acceptance. Simulate finished lighting conditions for reviewing mock-ups. 5. Obtain Architect's acceptance of mock-ups before start of final unit of work. 6. Retain and maintain mock-ups during construction in undisturbed condition as a standard for judging completed unit of work. When directed, demolish and remove mock-ups from project site, except that accepted in place mock-ups in undisturbed condition at the time of Substantial Completion may become part of completed unit of work. E. The Contractor shall furnish a letter from the adhesive manufacturer stating that the concrete substrate has been tested for moisture vapor transmission and that the moisture vapor transmission levels do not exceed the manufacturers recommendations. 1.5 SUBMITTALS A. Product Data: Submit manufacturer's detailed technical product data and installation instructions for each type of wood flooring. Include instructions for handling, storage, installation, finishing, protection and maintenance. B. Samples: Submit 12" long sets of range samples for wood flooring; include finish. 1.6 DELIVERY, STORAGE AND HANDLING A. Moisture Content: At time of delivery, limit average moisture content of wood flooring to 7%, for any piece. B. Protect wood flooring from excessive moisture in shipment, storage and handling. Deliver in unopened cartons or bundles and store in a dry place, with adequate air circulation. Do not deliver material to building until "wet work" such as concrete, stone, and plaster have been completed and cured to a condition of equilibrium. 1.7 PROJECT CONDITIONS A. Conditioning: Do not proceed with installation of wood flooring until spaces have been enclosed and are at approximate humidity condition planned for occupancy. Condition wood for five (5) days prior to start of installation by placing in spaces to receive flooring and maintaining ambient temperature between 65 degrees F. and 70 degrees F. before, during and after installation. Open packages of wood flooring which are sealed to permit natural adjustment of moisture content. 1.8 SPECIAL PROJECT WARRANTY A. Submit three (3) year warranty signed by Manufacturer and Contractor agreeing to repair or replace wood flooring which shrinks, warps, cracks, or otherwise deteriorates excessively, or which breaks its anchorage or bond with substrate or otherwise fails to perform as required, due to failures of materials and/or workmanship and not due to WOOD STRIP FLOORING

3 unusual exposure to moisture or other abusive forces or elements not anticipated for application. PART 2 PRODUCTS 2.1 RESILIENT WOOD FLOOR SYSTEM A. Wood strip flooring shall be rift sawn, Select, White Oak (per NWFA grading rules), 3/4" thick and 4" face width. Flooring strips shall be tongued-and-grooved and endmatched; back face of each strip shall be back channeled. Strips shall be standard random lengths, complying with grading rules. Wood shall be kiln-dried and moisture content of wood at time of installation shall not exceed 8%. B. Felt Underlayment: 15 lb. non-bituminous roofing felt; ASTM D 312. C. Plywood underlayment shall be CDX type ¾" thick fire treated (in accordance with New York City Code requirements) plywood sheathing. Plywood to be made with phenol formaldehyde glues. D. Wood Trim: Provide wood stripping, nosings, saddles and thresholds, as indicated in or adjacent to wood flooring, of same species, grade and cut as wood flooring. 2.2 WOOD FIELD FINISHING A. Stain: To match Architect's sample. B. Urethane Floor Varnish: Provide water-based urethane floor finish equal to "Street Shoe" as manufactured by The Basic Company, or equal made by Hillyard Chemical Co., Bona Kemi, or MinWax. Sheen of varnish shall be as specified by the Architect. 2.3 ACCESSORIES A. Fasteners: Provide screw type flooring nails as recommended by NWFA in "Installation Guidelines." B. Cork Expansion Strip: Composition cork expansion strip. C. Vapor Barrier: Eight (8) mils polyethylene. D. Mastic: Cut black asphalt type. E. Acoustical Sealant: As recommended by flooring manufacturer. F. Perimeter Isolation: 3/8" thick fiberglass board, 6-15 pcf. G. Sound Control Mat: 1/2" thick "Sound Barrier 440" as manufactured by Homasote, or approved equal. H. Self-Leveling Underlayment: "DSP-520" by H. B. Fuller or approved equal. WOOD STRIP FLOORING

4 PART 3 EXECUTION 3.1 INSPECTION A. Examine the areas and conditions where wood strip flooring is to be installed and correct any conditions detrimental to the proper and timely completion of the work. Do not proceed with the work until unsatisfactory conditions are corrected to permit proper installation of the work. After the approval of the on-site mockup, the Architect reserves the right to inspect the first sections of floor as they are installed to address the range control and blending to ensure that it is within agreed upon standards. 3.2 PREPARATION A. Concrete Slabs: Verify that concrete substrates are dry and moisture-vapor emissions are within acceptable levels according to manufacturer's written instructions. 1. Moisture Testing: Perform tests so that each test area does not exceed 200 sq. ft., and perform no fewer than two tests in each installation area and with test areas evenly spaced in installation areas. a. Perform anhydrous calcium chloride test per ASTM F 1869, as follows: 1). Proceed with installation only after substrates have maximum moisture-vapor-emission rate of 3 lb. of water/1000 sq. ft. in 24 hours. 2. Relative Humidity Testing: Perform relative humidity testing using in situ probes according to ASTM F2170. Proceed with installation only after substrate have a maximum 75% relative humidity level. B. Remove coatings, including curing compounds, and other substances on substrates that are incompatible with installation adhesives and that contain soap, wax, oil, or silicone, using mechanical methods recommended by manufacturer. Do not use solvents. C. Broom or vacuum clean substrates to be covered immediately before product installation. After cleaning, examine substrates for moisture, alkaline salts, carbonation, or dust. Proceed with installation only after unsatisfactory conditions have been corrected. 3.3 INSTALLATION (GENERAL) A. General: Comply with flooring manufacturer's instructions and recommendations, but not less than recommended by NWFA "Installation Guidelines." B. Pattern: Comply with pattern or direction of pattern for laying wood flooring, as directed by Architect. C. Expansion Space: Provide expansion space at walls and other obstructions and terminations of flooring, not less than 1/2". Fill expansion space with flush cork expansion strip. Nail shoe molding or other trim to baseboard, rather than to flooring. D. Wood strip flooring shall be securely fastened with no projecting fasteners and with no adjacent units in excess of 1/16" out of plane. WOOD STRIP FLOORING

5 3.4 INSTALLATION OVER ACOUSTICAL UNDERLAYMENT A. Lay sound control mat under entire areas to be covered by wood flooring and firmly seat in vapor retarder and adhesive and apply mat in accordance with manufacturer's recommendations. Roll surfaces to insure total adhesion free of bubbling, lifting, etc. Reset areas not totally adhered. 1. Install vapor retarder and adhesive following manufacturer s instructions. B. Prior to installing wood floor, full adhesion bond between adhesive and underlayment mat must be attained. C. In order to isolate the floor and break sound transmission path between floor and walls, install polyethylene foam or fiberglass board at the perimeter of the entire subfloor and around any protrusions through the installation. Tape or tack-glue the isolation material. D. Blind nail and glue flooring to plywood subflooring, spacing nails 6" o.c. with one nail within 2" of each end of each strip. 1. Fasteners for blind nailing must be sized so that they cannot penetrate into the acoustic underlayment mat. E. Wood Trim: Nail baseboard to wall and nail shoe molding to other trim to baseboard; do not nail to flooring. 3.5 SANDING AND FINISHING A. Machine sand installed unfinished flooring to remove offsets and non-level conditions, ridges, cups, and sanding machine marks which would be visually noticeable after finishing. Use three (3) grades of sandpaper, ending with 00 grade. Vacuum clean and immediately apply finish. Do not permit traffic on floor after sanding and until finish is completed. Cover sanded floor with building paper to provide access for application of first finish coats. B. Immediately after proper sanding, tack rag with clean-up solvent. Apply stain to match approved mock-ups and Architect's samples. Apply a thin coat of varnish. Allow to dry thoroughly. Burnish with #2 steel wool under a single brush floor machine. Tack rag with clean-up solvent. Apply a second and third coats of varnish in same manner. 3.6 PROTECTION A. Protect completed wood flooring during remainder of construction period with heavy Kraft paper or other suitable covering, so that flooring and finish will be without damage or deterioration at time of acceptance. END OF SECTION WOOD STRIP FLOORING