This is the culprit! The braided hose attached to this hot water bibb had its gasket fail such that water was dripping at a rate of two drops per second. For how long, no one knows. It finally became detectable when water pooled in the downstairs unit, soaking wallboard, carpet and delaminating Pergo flooring.
The Pergo flooring is delaminated.
The bedroom carpet is soaked & stained.
Water has pooled under the carpet & saturated the wallpapered wallboard.
The ceiling below the upstairs laundry unit is soaked.
I cut a hole in the ceiline to survey the extend of water travel & damage.
The MDF (fiberboard) molding in the adjacent bathroom is swollen (shot), to be replaced with wood.
I cut away the papered wall after removing the chair rail to allow the spaces to dry.
After drying, Killz was applied to trap & kill the mold.
Friend Jeff replaced the affected drywall & textured the ceiling.
After applying a coat of PVA sealant, I hung 20+ sq ft of replacement embossed/paintable wallpaper below the chair rail. You can see that I have put down a moisture barrier pad for the new Pergo.
This is corner of the ceiling patch where the wallpaper had released. I was able to repaste it without replacement, securing it with new crown molding.
The Pergo flooring goes down, while the painted molding waits in line. It measured out at 118 sq ft and by being careful, I used only the 120 sq ft of Pergo that came in six boxes. I was lucky to have the few scraps left that I did!
This was the ceiling hole.
"What damage?", you say? Could that be the sign of a good repair?
Prior to being a sailboat liveaboard, I was a homeowner for over 30 years. That time provided ample opportunity to learn a few things that help me now in assisting others. What do you need?