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Old 02-15-2014, 12:11 PM   #1
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Subfloor prep

My home is currently stripped to studs and the current subflooring is exposed. The subfloor consists of 3/4" diagonal plank slats. There was termite damage in certain areas of the home and some of the wood has small sections that seem weak.

1. Should i place 1/2" OSB/Plywood over top of all the planks, and is 1/2 sufficient?

2. Rip up all old planks and replace with 3/4" plywood.

The floor is 16" OC in some locations and 24" in others. All areas of the home except for the bathroom and kitchen will have new 3/4" hardwood installed, and these two areas will be tile.

3. For the tiled areas, is plywood necessary over the planks if i put concrete board down? I'd like to keep the levels of the floor the same if at all possible.

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Old 02-15-2014, 11:52 PM   #2
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Hi Joe,

You either have to replace all planks that are not in good condition, or removed them all and install 3/4" t&g subfloor grade ply or a product like Advantech. You can repair or stiffen the joists at this point.

1. If you keep the planks and they're in great shape, 1/2" may be fine if they're 4" wide. Wider or cupped planks need thicker subfloor.

2. Lots more work but might be necessary.

You can install supports to stiffen where the joists are 24" oc. Was this area an addition and built that way or was it a mistake?

How about the joists? What size, do you know their species and grade? What's the unsupported span?

What specific type of tiles will you be installing? Size?

3. Absolutely you gotta have ply over planks, then the concrete backer or a membrane such as Ditra.

Keep the buildup lower by removing the planks and installing 3/4" sub. Then 1/4" tile backer or if you wanna go premium, use Ditra.

TILE GUY - retired- TROY, MI - Method & Product suitability consulting.

MARBLE from ITALY & GREECE -PERLATO-PERLATINO-BOTTICINO-THASSOS-SIVEC-VOLAKAS-CALACATTA- NAXOS-Slabs-Tiles-Custom containers shipped to you - [email protected]
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