Installing underlayment over rough plywood - fasteners? advice needed

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  #1  
Old 01-03-13, 07:55 AM
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Installing underlayment over rough plywood - fasteners? advice needed

My end goal is installing groutable laminate tiles, currently I am staring at a plywood subfloor which is pretty rough, lots of divots and remnants of the glue that was holding on some old flooring that I had to remove. My plan was to throw down some 1/4" plywood underlayment on top to give me a nice clean surface to install the tiles on.

The tricky thing is I dont know exactly how to install the underlayment, nor am I sure exactly what is under the plywood. I know there is very old linoleum under the plywood, so i dont want to rip up the plywood and risk exposing that linoleum. My plan is to use glue and screws to secure the underlayment but I'm not sure what length/type screws to use as I don't know exactly how deep I can go not knowing whats under the linoleum.

Any advice is greatly appreciated. Also big thanks to all the contributors to these forums, I have been able to successfully complete many projects just browsing the forums, this is the first time I've been stuck enough to need to post. Maybe someday I can help someone else out!
 
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Old 01-03-13, 08:17 AM
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Welcome to the forums.

Typically, a staple is used for 1/4" plywood in these situations. That said, just what all do you have there? I'm not a big fan of putting something else on top of linoleum/vinyl and I would be inclined to rip it all out first.
 
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Old 01-03-13, 08:38 AM
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Linoleom under your tiles will flex causing your tiles / grout to crack over time, I would strip it all the way down and then think about putting down the underlayment.
 
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Old 01-03-13, 09:16 AM
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Thanks for the quick replies, sorry I was away.

So what exactly I have right now is rough plywood on top of old linoleum on top of a mystery. Since the floor is over a crawlspace I assume I have more plywood under the linoleum. I'm hesitant to rip up the top layer of plywood or the linoleum underneath it as this is an old house and I am concerned about asbestos in the linoleum. Ideally I'd prefer to just build on top of what I have currently.

My layout is basically this:

--------Rough Plywood----------
----------Old Linoleum-----------
---------Fun Mystery------------
----------Crawl Space-----------

Thanks again!
 
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Old 01-03-13, 09:28 AM
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Any heating vents in the floor? Often you can see all of the layers when you remove one.
 
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Old 01-03-13, 09:29 AM
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Unfortunately no, our house is all electric heating, so all of our vents are in the ceilings.
 
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Old 01-03-13, 09:31 AM
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I can't advise doing this the way you intend nor would I do it that way in my own house.

Maybe someone else will have some ideas for you but I'm out of them at the moment
 
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