Why is my subfloor wavy and dropping?
Subfloors can drop and feel wavy or roll when long-term damage causes structural sections to cave in. This leaves homeowners dealing with progressive floor failure on their own because insurance typically excludes long-term damage, preventing them from safely finishing renovations until the underlying structure is repaired.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1Hiring expensive restoration companies like ServPro
- 2Waiting for contractor estimates while trying to prevent further damage
- 3Relies on friends who dabble in HVAC and handy friends for help
In their words
Unedited, most upvoted first, each linked to the thread it came from.
“a portion of our floor caved in.”source ↗
“i have no clue what to do here.”source ↗
“it’s getting progressively worse by the day, last night we had more subfloor fall but the laminate did not come down so that’s holding another hole at this point.”source ↗
“my home owner’s insurance stated this was long term damage and therefore not covered by anything with them, so we’re on our own here.”source ↗
Where this came up
People with this problem also raised
- 21How to tile over an uneven subfloor without tearing it up
- 2Sudden split and missing chunks in bathroom subfloor
- 3Why is my apartment flooring bubbling and getting gaps after cleaning?
- 2Should I add plywood to a flexing subfloor or replace it?
- 2How to fix an H-pattern in installed flooring without tearing it all up
- 4How to stop cracking and popping noises when walking on floors