contaminates), dry according to the NWFA guidelines for your region, structurally sound and smooth (ridge-free) within a flatness tolerance of ≤ 1/8-inch over 6-foot and 3/32-inch over 1-foot in all directions. Any unused allowance money is returned to the owner. View Store Details Providing an allowance enables the owner to compare floor covering bids on an equal basis. Sistering material to get the elevations within tolerance, which is the reinforcement of a joist by nailing, or attaching alongside the existing joist, another joist or reinforcing member. Gaps in hardwood floors can be a huge visual annoyance. 2618 NE Vivion Road Kansas City, MO, 64119 (816) 548-1724. Not only are they an eyesore, they can also collect dirt and dust. An NWFA Certified Inspector can provide a thorough, unbiased inspection of the entire job to help find the cause. gap between Division 3 tolerances and Division 9 tolerances. Expansion gap Yes, 5/16-inch (8 mm) minimum ... (without contaminates), dry according to the NWFA guidelines for your region, structurally sound and smooth (ridge-free) within a flatness tolerance of ≤ 1/8-inch over 6-foot and 3/32-inch over 1-foot in all Yes, it’s a category of flooring that has taken off in terms of demand, but it has its issues. Are these problems manufacturing-related, installation-related or site-related? REFER TO NWFA INSTALLATION GUIDELINES, SECTION III, CHAPTER 9 ... Leave 1⁄2” gap at all vertical objects, undercut all door jams. If you have any questions, contact your ASCC concrete contractor, the ASCC Technical Hotline at (800) 331-0668, the NWFA at (800) 422-4556 or the This should be included in the directions that came with the product; NWFA Installation Guidelines say most manufacturers recommend a flatness tolerance of 1/8 inch in a … Two national flooring associations, the National Wood Flooring Association (NWFA) and the Flooring Contractors Association (FCICA) have endorsed a position statement on floor flatness tolerances written by the American Society of Concrete Contractors (ASCC). Planing the existing floor joists, which includes removal of material to bring the elevations to within tolerance after the subfloor is replaced. If required, use an underlayment grade plywood, with a minimum thickness of 1/4”. These products can only be installed on or above ground. defect/irregular tolerance of up to 10% is allowed). The NWFA Installation Guidelines were developed by our industry to ensure successful installations with all types of wood floors. Solutions Regardless of what environment a floor has been exposed to, or exists when inspected, removal and replacement of a wood floor to alleviate gaps is usually both unnecessary and self-defeating. Because wide plank flooring has become the most common product sold and installed today, the evolution of our guidelines will continue to explore the many methods used to install them. End joint gapping/buckling of luxury vinyl tile and planks has been a concern for several years and has cost the industry more headaches, time and money than we ever thought it would. A solid hardwood board is milled from one piece of wood and is typically 3/4" thick (although some come in 5/16" thickness). Opens today at 9:00 am. Fix down any loose or squeaking boards.