No and this is not recommended.
Shorter floor boards also need to be properly fasten therefore do not install flooring directly over floor joist without proper subflooring.
• All structural subfloor panels must be installed sealed-side down, and provide minimum ¾” perimeter spacing. Square-edged or non tongue and grooved panels used as a subfloor will require a minimum 1/8˝ (3 mm) expansion space placed between all plywood seams. Panels must meet minimum CDX grade Exposure 1 and US Voluntary Product Standard PS1-95, PS2-04 or Canadian performance standard CAN/CSA 0325-0-92 for construction sheathing. Check panel for codes.
• Solid planks used for subflooring should be ¾” x 5 1/2” (1” x 6” nominal), Group 1 dense softwoods, No. 2 Common, kiln-dried to less than 12% percent moisture content.
• Particleboard, Luan or Masonite: is not recommended, remove or cover with 3/8” plywood.
• Minimum of 3/8˝CDX panel thickness is recommended when used as an underlayment over an existing subfloor.
• Avoid pressure treated plywood for interior use. These can have elevated moisture or latent with rot resistant chemicals.
Note that joist spacing determines minimum subfloor thickness.
• Joist spacing 16” on center (OC)
Plywood: Minimum of (5/8˝) Oriented Strand Board (OSB): Minimum (3/4˝, 23/32”) Advantech Minimum (3/4˝, 23/32”)
• Joist spacing 16” up to 19.2” (OC)
Plywood: Minimum of (3/4˝, 23/32”) Oriented Strand Board (OSB): Minimum of (3/4˝, 23/32”)
• Joist spacing over 19.2”up to maximum 24” (OC)
Plywood: Minimum of (7/8”) Oriented Strand Board (OSB): Minimum of (1”)
You can find complete installation instructions on the product page by clicking on the installation tab and then clicking on - Installation Guide.
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Answered on 3/9/2015 by cc-2