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Old 02-15-2018, 09:22 AM   #1
benualson
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floor prep advice

Bought a 1954 ranch to remodel and move my family into.

Currently, we've pretty much gutted the main level. The only thing touching the subfloor right now are the stud walls and exterior walls. There is 1/2 plywood on the 16 OC floor joists on the entire 1600 sqft of the main level. It isn't T&G. It is nailed down. About 40% of it is dirty with residual adhesive and a but of damage from scraping up old flooring/adhesive.

We want to put hardwood floor down in most of the area and tile in the bathrooms and entry areas.

So, I want to prepare the entire 1600 sqft for those applications.

Reading through this forum, I'm not sure what I should do.

I'm thinking of laying down 3/4" T&G plywood over the entire 1600 sqft. I'm not certain what the best way is to fasten it to the floor.

I'm not sure if I should just install the new T&G as a subfloor (install it as though the existing 1/2 subfloor is not there).

Or, if I should install it as an underlayment (with possibly wood gluing/laminating the entire thing) while following this pattern:

http://www.johnbridge.com/images/mik...-0604.pdf..pdf

Any advice would be appreciated,
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Old 02-15-2018, 05:28 PM   #2
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Welcome back, Ben.
Quote:
Originally Posted by Ben
I'm not sure if I should just install the new T&G as a subfloor (install it as though the existing 1/2 subfloor is not there).
If you're not prepared to remove the existing subflooring, that would be my first choice. Be sure your fasteners are long enough to penetrate the joists by a minimum of 3/4-inch.

My opinion; worth price charged.
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Old 02-15-2018, 09:37 PM   #3
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Welcome back, Ben. If you're not prepared to remove the existing subflooring, that would be my first choice. Be sure your fasteners are long enough to penetrate the joists by a minimum of 3/4-inch.

My opinion; worth price charged.
I'm probably in a good position to remove the existing subfloor. Do you just cut it up to the stud walls? Then add blocking to support the new subfloor at those edges?

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Old 02-19-2018, 11:18 PM   #4
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I've talked to a couple contractors to bid the job of installing 3/4" t&g plywood over the existing 1/2". Both say they would lay it opposite the 1/2" layer (parallel to joists). I assume that is a red flag and I should keep looking for someone who knows it should go down perpendicular to joists?

If I cannot, I'll just have to man up and diy it.

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Old 02-20-2018, 10:28 AM   #5
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Yep, red flags for sure. All layers should run perpendicular to the joists.
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Old 02-20-2018, 05:43 PM   #6
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Another major installation error is to never have four corners line up...the sheets should be offset. The ply (and OSB) has quite different stiffness characteristics, and needs to span the narrowest supports, not run along them.
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Old 02-21-2018, 05:48 AM   #7
benualson
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Welcome back, Ben. If you're not prepared to remove the existing subflooring, that would be my first choice. Be sure your fasteners are long enough to penetrate the joists by a minimum of 3/4-inch.

My opinion; worth price charged.
Glue or no glue? Fasten in field as well?

I'm thinking the answer to both of these is a no.

Should I get Avantech?

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Old 02-21-2018, 01:33 PM   #8
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No glue, and just fasten to the joists as though the 1/2" plywood isn't there. I'd recommend 2 1/2" screws or longer, and deck screws only. No sheetrock screws.

Advantech is fine.
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Old 02-28-2018, 11:10 AM   #9
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so we are saying to fasten to the joists as though the 1/2" plywood isn't there. Does that mean my 4ft ends should meet on a joist? Currently if I just lay a sheet down it would be 4 inches past the joist. (16OC)

No such thing as a stupid question, right?
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Old 03-02-2018, 01:42 PM   #10
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Any thoughts on my previous message? Also do I need to prep the existing floor besides vacuuming it?
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Old 03-02-2018, 08:13 PM   #11
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Page 18 of the 2018 Schluter Ditra installation manual gives detailed instructions of how to add a second layer of subfloor to an existing one. It may be helpful in your situation and is available as a PDF online.
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