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[ARCHIVED THREAD] - Subflooring question

Posted: 1/28/2017 2:20:21 PM EDT

Adding 7/16 OSB over old plank Subflooring. This is for a fiberglass shower installation.
Do I need an felt underlay or just a plastic vapor barrier between the OSB n plank subflooring?

Should I use an adhesive between them or just underlayment n screw it down good?

Any guidance appreciated.

Posted: 1/28/2017 2:54:51 PM EDT

[#1]

I didn't replace the floor on mine but painted it with a coating I found at Lowes ~~(googling now)~~ I wouldn't use OSB myself

found it

http://www.homedepot.com/p/Custom-Building-Products-RedGard-1-Gal-Waterproofing-and-Crack-Prevention-Membrane-LQWAF1/100169081

Posted: 1/28/2017 3:00:32 PM EDT

[#2]

Just use actual X-grade (waterproof glue) plywood.

Posted: 1/28/2017 7:58:01 PM EDT

[#3]

I wouldn't use OSB.

But at least it will tell you if there's a leak faster

IIRC, some codes prohibit OSB in showers/tubs

Posted: 1/30/2017 7:59:19 PM EDT

[#4]

Thanks for the info folks!

[ARCHIVED THREAD] - Subflooring question

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[ARCHIVED THREAD] - Subflooring question

[ARCHIVED THREAD] - Subflooring question