Yes, as per NWFA Installation Guidelines:
National Wood Flooring Association ©2007 l Revised 05.2012
Installation Over Existing Floors
Existing Floor Requirements
A. Always follow the manufacturer’s recommendations for installation over existing flooring.
B. Glue‐down parquet applications that require the use of PVA adhesives are not recommended over existing
sheet vinyl or vinyl and cork tile flooring unless an underlayment is put down first. Underlayment should be in
accordance with adhesive and/or flooring manufacturer’s recommendations.
C. Particleboard is not generally an acceptable underlayment, because it lacks stability. Some manufacturers
approve particleboard as an acceptable underlayment, as they do not warrant against subfloor movement. In
such cases, follow manufacturer’s recommendation.
D. Other types of adhesives may require the use of a primer or vinyl blocker when installing over sheet vinyl or
vinyl and cork tile flooring. Follow adhesive manufacturer’s recommendations.
E. Nail‐down applications may be successful over existing sheet vinyl or vinyl tile if fastener penetration is not
significantly diminished and the subfloor meets minimum requirements. Fasteners must penetrate a proper
subfloor by at least 5/8”.
F. Wood flooring can be installed over existing ceramic tile, terrazzo, or marble with proper underlayment or
adhesives only on manufacturer's recommendation.
G. Installing wood flooring over an existing wood floor.
Caution: Do not sand any surfaces containing lead based finishes/paints or asbestos. Check applicable local
and federal EPA and OSHA regulations. For buildings built in 1978 and earlier, contact the EPA for lead based
testing prior to any sanding (www.epa.gov).
1. If safe to do so (see caution above), sand off old finish and or high spots and prep to clean, dry, sound and
flat. Repair, renail or replace loose flooring products as needed.
2. Over an existing glue‐down floor, glue direct to the existing floor. Or, if the thickness of the floor will allow
it, staple to the existing floor. Check with the flooring manufacturer for recommendations.
3. When installing new wood flooring parallel to an existing solid nail‐down floor, add a minimum of 3/8”
plywood underlayment over the existing floor to increase stability. Check with the flooring manufacturer
4. When installing new wood flooring at a 45‐degree to 90‐degree angle to an existing solid nail‐down floor,
additional underlayment may not be required.
Answered on 7/1/2014 by cc-2