Why are you wanting to add another layer of subfloor instead of riping out the old vinyl? I personally don't like just adding layers to cover up what is there. I would rather take the time to rip out the old before the new goes in. Unless you are looking to raise the floor height.
I have never layed vinyl but have seen others use 1/4" luan and staple it down with a TON of staples!
Perhaps I wasn't clear...
The concrete under the existing floor is not very smooth. It is for this reason that the current vinyl flooring is in the condition it's in.
I see it best to make a flat area first and to add a thin plywood sub-floor may be my best option. Unless you know of another. Please don't tell me to correct the cement, It isn't that bad. Just bad enough to ruin the layer put on top.
But I don't want to remove the old flooring if I am just going to cover it anyway, It's on pretty good.
I don't have any serious peaks or valleys from this concrete. It just a few "rough" areas.
If I cut the sub-floor to size (the room is only 4x6) so that it is "one" piece, will glue do the job? Any suggestions on a type of glue?
Common sense tells me that nailing thin plywood to concrete would be no good. Especially when I want it as smooth as possible. But I'm not looking for perfection. It's only a mud-room.
I see now that you explained a little better. Glue sounds like a good plan.
Sometimes I do things the hard way. Like ripping everything out and fixing the problem. This way I know I am starting fresh and it will be done right. Sometimes this is overkill but that's just how I am!
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