Got the inside of my cellar top building wet. I thought I was 30 yrs old and yanked the roof off. Figured I'd have it back on before storm hit. WRONG!! More rot than expected and I ain't 30 yrs old anymore!! Floor is rough Oak I don't think it will hurt it Joists under floor in top of cellar are 2x12 rough cut oak. I was building for the duration if tree hadn't started roof leaking . I used that stupid wafer board as sheathing. Didn't last long after rian started getting to it. By the time I caught it it was gone. If I had jumped in as soon as t was damaged I probally could have saved it but like I said I ain't 30 anymore!!