I have a post and beam flooring structure in my 45-year-old home. The subfloor is 2 x 8 tongue and groove installed green. In my remodel, I plan to install 3/4" hardwood flooring over part of my single story home and porcelain tile in the bathroom and laundry room. What type of structure over the 2 x 8's (plywood or OSB)should be installed under each type of new flooring? Additionally, what should the nailing or screwing pattern for that installation? Tom

  • Are you sure it's 2x8? 45 years ago a combination of plywood and particle board was common. Solid wood subfloors had long since gone out of fashion, and two-by subfloor is almost unheard of to begin with, let alone green. Where are you? – isherwood Mar 25 '19 at 17:54
  • Also, how is the subfloor fastened? Does it squeak much? – isherwood Mar 25 '19 at 17:56
  • To second @isherwood's comments: Are you sure the 2 x 8 floors are not really a hardwood floor that was installed on top of another floor? Have you looked from underneath? (I'm sure you have if you have a standard basement but maybe you have a crawl space, finished basement that hides the underside of your floor, etc.) 2-inch tongue and groove board would be much more normal as a finished floor. I have a solid wood subfloor in my 100-year-old house but it's not tongue and groove, and they are ~10-inch wide planks. – taxypayer22847 Mar 26 '19 at 0:46
  • Timberframe: What is the spacing between floor supports? T&G 2x6 will tolerate 4 foot spacing and have allowable deflection. I wouldn't worry about hardwood directly over the T&G if the floor is flat enough. Tile: Do deflection checks first. – Sherwood Botsford Mar 28 '19 at 1:47
  • @SherwoodBotsford: Can you describe steps to do a deflection test please? – peinal Oct 29 '19 at 0:14

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