bathroom reno help

I am a novice DIYer who is attempting a second floor bathroom renovation.I had to move my toilet about 5 feet so I could replace the exising 30inch vanity wih a 42inch one.It was relatively easy to move the toilet as I extended the 3inch ABS toilet drain paralell to the 10 inch floor joists.I removed the existing vinyl flooring, removed a layer of 1/4 inch particle board, and had to cut out pieces of 1/2 inch plywood to move the toilet. Now I have to put the subfloor back together again and install a toilet flange above a 90 degree 3 inch ABS fitting.I want to put a solid subfloor down as I am installing a larger soaker tub and will be laying granite tile.I am stumped/ overwhelmed by how I proceed next. I can't just pull up the existing 1/2 inch plywood and replace with it with--say-3/4 inch plywood because some of the bathroom walls are sitting on the plywood.When I cut part of the subfloor out for the drain I couldnt cut the plywood down the middle of a joist because thats where the plywood was nailed. So if I patch my holes with 1/2 inch plywood and put another 1/2 inch on top, the subfloor will be weak where I patched my holes. The joints of the patch will not be sitting on a joist.Whats the best way to proceed?Also, is it better to lay my subfloor and then cut a hole above the 90 degree bend to install my toilet flange, or extend a piece of abs out of the 90 bend and cut my subfloor around it? Thanks
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On Jan 8, 7:10pm, snipped-for-privacy@gmail.com wrote:

You should have, and still could, remove the nails where the plywood sits on the joists and put your seams where they belong. A Cat's Paw is the tool for the job:
http://www.mikestools.com/Cats-Paws_1019.aspx
Another option is to sister a joist onto the side of the existing joists to give youself a nailing surface.
http://www.hammerzone.com/archives/framecarp/supplement/floor/joist1/sister.htm
Cutting the subfloor before installing it over the 90 is probably easier since you'd need to measure it out anyway. Also less chance of mis-measuring and cutting it wrong/damaging the 90.
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Thanks for the direction.I think I will cut my hole larger--cutting in the middle of the next joist over. Brent
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I'm curious as to why you didn't just replace the vanity with one the same size and leave the toilet alone.
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On Jan 9, 1:27pm, snipped-for-privacy@gmail.com wrote:

Personal preference, perhaps?
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On Jan 9, 11:27am, snipped-for-privacy@gmail.com wrote:

I moved a wall and incorporated the space from a closet in an adjoining bedroom into my bathroom. I am trying to make my bathroom bigger. Its the main bathroom in my house and it was tiny--room for one person to stand and thats it.
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On Jan 9, 11:27am, snipped-for-privacy@gmail.com wrote:

I moved a wall and incorporated the space from a closet in an adjoining bedroom into my bathroom. I am trying to make my bathroom bigger. Its the main bathroom in my house and it was tiny--room for one person to stand and thats it.
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On Jan 9, 11:27am, snipped-for-privacy@gmail.com wrote:

I moved a wall and incorporated the space from a closet in an adjoining bedroom into my bathroom. I am trying to make my bathroom bigger. Its the main bathroom in my house and it was tiny--room for one person to stand and thats it.
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