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Old 01-14-2015, 07:49 AM   #1
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Prepping for tile after removing stone


We have removed slate and 3 inches of concrete in which it was set from our foyer. This exposed the tops of joists that had been chiseled by hand (apparently) to bring them down to a height that would allow the stone to sit at the same level as the oak floor in the living room. Under these joists is drywall (the ceiling in the lower level). About 3" below the top of the joists they nailed 1x2 to the top of which they attached 3/8" plywood. Under that plywood is insulation. We want to put down 3/4" tongue in groove plywood as a subfloor, followed by 1/4" baseboard as underlayment for tile. We are thinking of nailing and screwing 2x2s as sister joists sitting on the 3/8" plywood in order to ensure a flat and level base, then adding 1" inch foam insulation, then laying the plywood subfloor.
The question is, is this a reasonable approach. The exposed length of the joists is 6-1/2'.
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Old 01-14-2015, 10:16 AM   #2
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Not a great plan for several reasons.
A 2 X 6 is way under sized to support tile properly, and to add insult to injury there not even as wide As they where before.
Sistering wider joist would be one way to fix that.
No way do you want any form of foam under the plywood!
Trying to picture why there was 3/8 plywood, useless as a subfloor.
Pictures would be a big help, get more answer's and less questions.
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Old 01-14-2015, 10:56 AM   #3
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Quote:
Originally Posted by joecaption View Post
Not a great plan for several reasons.
A 2 X 6 is way under sized to support tile properly, and to add insult to injury there not even as wide As they where before.
Sistering wider joist would be one way to fix that.
No way do you want any form of foam under the plywood!
Trying to picture why there was 3/8 plywood, useless as a subfloor.
Pictures would be a big help, get more answer's and less questions.
The 3/8" plywood was there to support the concrete that was thrown-in above and between the original floor joists I think. This creates a pan to support the concrete and later when the concrete cures the subfloor rigidity comes from the concrete.

The tops of the floor joists corners are usually hacked with a hatchet to remove the corners of the wood so that fractures in the concrete won't develop and radiate outward from the corners of the floor joists and fracture the stone flooring in the process.

The way to repair this and ready it for new flooring is to use the same size floor joists and kiss (sister) them onto the existing damaged floor joists using bolts. Elevate the tops of the "sisters" to were they need to be to match the original (top-o-the-joists) elevations, then add the new plywood subfloor .

Typically 2X6 is not the proper material to use but in this case 2X6 will probably work fine after being bolted to the existing joists. This will change/improve the "bending-moment" of the joist combination greatly.
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