NWFA Installation Instructions

Please click on the links below to access the PDF File of the NWFA Installation Guideline.

Before Installation
Before installation any concerns about the milling or grading of this product must be directed to and resolved with the manufacturer. After the product is installed the customer assumes all responsibility. The manufacturer will not be liable for any costs of product or replacement if issues are not resolved prior to installation.

Job Site Conditions*
Kiln-dried flooring should be stored in an enclosed building that is well ventilated. Flooring should not be exposed to excessive periods of high humidity or moisture. All concrete masonry, sheetrock and framing members, paint, etc. should be thoroughly dry before flooring is delivered to the job site. The average moisture content of the sub flooring should be within 4% of the moisture content of the flooring before installation. From the time flooring is delivered and until occupancy, temperature and humidity should be maintained at occupancy levels.

Sub Floor*
Installation solid hardwood flooring over a concrete slab or radiant heat will void our warranty. Plywood, 5/8” or ¾” performance rated products are preferred. Also, ¾” OSB is an acceptable substrate. Particleboard of any thickness is not recommended.

Laying and Fastening the Flooring*
To Install Solid Hardwood Flooring, cover the sub floor with a vapor retardant such as 15lb asphalt felt or SVS Silicone Vapor Shield Underlayment Paper, overlapping the ends 2-4”. Direction of the flooring should be at right angles to the joists. For strip flooring (3 ¼” width and narrower) use a 2” barbed flooring cleat or staple. Spacing between nails should be 8-10” apart. Nailing is required within 2” of the end joints and at least 2 nails are required per board. End joints should be staggered at least 6” apart. An expansion gap of ¾” should be left around the walls.

Maintain the relative humidity in the areas with hardwood flooring. Excessive swings in humidity will cause the flooring to crack, shrink or expand. The recommended range in relative humidity is 40%-50%. Use protector pads underneath chairs and heavy furniture. Place mats by exterior doors and high traffic areas use rugs that allow the floor to breath (avoid rubber backed rugs). Vacuum or sweep floors to remove loose dirt then clean your flooring.

*Please refer to the NWFA Instruction Manual for more detailed instructions.


Notice, Acknowledgement, and General Definitions


Section I

General Guidelines

   Chapter 1 Jobsite Conditions
   Chapter 2 Acclimation and Conditioning of Wood Flooring
   Chapter 3 Moisture Guideline Testing and Vapor Retarders

Section II

Subfloor Guidelines & Specifications

   Chapter 4 Wood Subfloor Guidelines
   Chapter 5 Concrete Subfloor Guidelines
   Chapter 6 Installing a Subfloor Over Concrete

Section III

Installation Guidelines & Methods

   Chapter 7 Parquet Installation
   Chapter 8 Engineered Wood Flooring Installation
   Chapter 9 Solid Strip and Plank Flooring Installation
   Chapter 10 Installation Over Existing Floors

Section IV


   Appendix A Safety Guidelines
   Appendix D Moisture Content by Area – U.S.
   Appendix E Moisture Content by Area – Canada
   Appendix F Fastener Schedule
   Appendix G Trammel Point Method
   Appendix H Radiant Heat Installations
   Appendix I Installation Over Screeds
   Appendix J Sound Control
   Appendix K Trim & Thresholds
   Appendix L Sample Specification
   Appendix M Jobsite Checklist

Section V

Glossary of Wood Flooring Terms