Do I need to use 1/8 underlayment as Sub-flooring for oak floor in older home?.?
I am installing 2 1/2" wide red oak floor over a old maple tongue and groove floor some part are very irrigular. Do I need to use 1/8 underlayment (plywood type) or can I use the roll type of underlayment? Also do I need to screw down all the old floor first? I am putting hardwood flooring in the bathroom too, what is the recommended underlayment for that?
As long as your total thickness of underlayment is at least 3/4" you should be ok. Actually, for each layer you have, I personally would increase that minimum by 1/4"
This should not be a problem in your case.
In the bathroom you don't state if you currently have maple there.
If you currently have carpet over particle board you must rip out the particle board and put down plywood using the same formula I have outlined above.
I also agree with those that say that you should level the floor. This will help prevent squeaks and assure that the flooring doesn't work loose over time. I have never had to do this, but i wonder if you could almost do this on a row by row basis, where you nail the wood in place and then just fill in some grout type material in any gaps. At least for short gaps less than a foot I would think this would work. Maybe someone else can chime in on this.
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