Wood Strip: Board or Plank Subfloors For Installations of Armstrong Flooring Products

Armstrong Flooring resilient floors are recommended on suspended wood subfloors with a 1/4″ underlayment (see product installation systems for exceptions) and a minimum of 18″ of well-ventilated air space below. Armstrong Flooring does not recommend installing resilient flooring on wood subfloors applied directly over concrete or on sleeper-construction subfloors.

Loading requirements for subfloors are normally set by various building codes on both local and national levels. Trade associations such as APA-The Engineered Wood Association provide structural guidelines for meeting various code requirements. Subfloor panels are commonly marked with span ratings showing the maximum center-to-center spacing in inches of supports over which the panels should be placed.

Wood Strip, Board or Plank Subflooring

These subfloors must meet structural requirements. Regardless of whether the subfloor is single- or double-layer, Armstrong recommends the following:

  • If the top layer is tongue-and-groove and the strip wood is 3″ or less in face width, cover with 1/4″ or thicker underlayment panels.
  • All others should be covered with 1/2″ or thicker underlayment panels.
Updated on August 15, 2022