I pulled up the vinyl in the bathroom with the intention of laying LVP to match the rest of the unit, and found there was significant water damage around the toilet and bathtub: [img]https://cimg4.ibsrv.net/gimg/www.doityourselft.com-vbulletin/2000x1504/overall_75f279806d2624bc51d4ba10fb6277e395dd825a.jpg[/img] Close-up of the rot around the tub area: [img]https://cimg1.ibsrv.net/gimg/www.doityourselft.com-vbulletin/2000x1504/tubcorner_78a00669eda91017b5aab7aeedeebfc6ee382999.jpg[/img] My questions: 1. The toilet seems to be working normally. How can I confirm there is no active leak? I plan on replacing the toilet anyways, but want to confirm there's nothing more sinister going on. 2. What's the proper repair for the toilet area? My current thinking is just to clean it (e.g. mold armor) or spray it (e.g. kilz). 3. What's the proper repair for the tub area? I could replace the top 0.5" layer of particle board. Is that sufficient or do I need to deal with the wood underneath the particle board (the darker color with the white coloring)? Overall, what would you do to replace the flooring here? Can I just patch things up, or do I need to lay another layer of wood as underlayment, or rip everything out and replace? This is for a rental so looking for a relatively cheap/straightforward fix.

Hi! I am planning to put engineered hardwood floor down in a home I just purchased (built in 1975). Subfloor is in pretty good shape. It is 1/2” plywood with 1/4” OSB nailed on top. I know that the standard is 3/4” subfloor for engineered but I am concerned because I know that 1/4” OSB is not really worth much in terms of strength. I would prefer not to tear this up or build it up because it is a huge pain and sheet goods are so costly but I will do it if have to....I was just planning to screw the two sheets together to decrease creaks and move on. Hoping to have your opinion? thank you! Subfloor: [img]https://cimg3.ibsrv.net/gimg/www.doityourselft.com-vbulletin/2000x1504/image_f1870452a30cd26daced1814c328b4e38206088d.jpg[/img] Example of thickness (looks a bit thicker due to some flaring at the edge here but it’s 1/4” OSB) [img]https://cimg8.ibsrv.net/gimg/www.doityourselft.com-vbulletin/2000x1504/image_bfb290e52ffcde11add14283f798dde30a7fdbb8.jpg[/img]