Forum Title: Subfloor Sagging
Had a demo crew out to rip out a tile job upstairs for my Hallmark job coming up. The tile looked like the surf coming in. I told the lady/owner something is messed up besides the krappy tile job the unlicensed hacks did. Tiles busting loose, grout cracking out, flatness off by 2 1/2 inches in spots. She had some engineer out, he looks at the ceiling down below and structual issues up there, it is just the tile. So the demo guy calls up and says we need a meeting. The subfloor and joists are sagging in some areas and he wants to brace it and add some 3/4 ply, but also leave some old OSB to go over top of. Question is, how can the floor sag but look perfectly fine underneath? I think there must be a couple feet of airspace between the two. This is going to be interesting. Taking camera for this one.
Category: Flooring Post By: SONIA FITZGERALD (Napa, CA), 02/23/2019

Drywall can be wrapped around all sorts of curved surfaces, especially if its 3/8 thick. If he didnt put a straight edge on the ceiling how the heck did he know that the joists werent all over the place? A subfloor can look flat until you lay a straight edge down.

- RICHARD DAVIS (Lafayette, LA), 04/20/2019

Probably a drive by inspection.

- ALFRED MORRISON (Lakeland, FL), 03/31/2019

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