Re: installing hardwood floor in bathroom - subfloor issues
Aside from a sweaty toilet, I will disagree with my comrades about installing hardwood in a 1/2 bath. The key words being "1/2 bath"! If this were a full bath, then I'd definitely be saying no, but in a half bath the only real water danger is going to be the toilet. As long as the supply lines and the seal at the base are good then the dangers of water are very low. What's most important is that there be no movement in the floor that can damage the wax seal at the base of the toilet. This is an issue with a floating floor because there is a foam pad under the hardwood that has flex and give. In the area of the toilet, do not install the pad, instead use plywood of the same thickness as the pad. This will give you the stable base you need. When I installed hardwood throughout my house, I included the 1/2 bath with the precautions mentioned and never had a problem with leaks or floor movement. Just keep an eye on the toilet that it never becomes loose or wobbly, if it does get the wax seal replaced immediately.
As for fixing the subfloor, what I typically do if I can't use readily available framing is to add in my own around the toilet flange that is attached to the surrounding floor framing with joist hangers. If your maximum span is less than 4', you can use 2x4's, if it's over 4' then use 2x6's. Cut the damaged area out as clean and neat as possible, install the framing so that it supports the loose ends of the existing subfloor, then fill in the hole with new material that is the same thickness as the existing subfloor planks.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!