Said It Here

How to clean mold under water damaged flooring without DIY experience

Water seeping under vinyl or baseboards traps moisture that causes mold growth on the subfloor. Without handy skills, homeowners facing this issue struggle to know whether they can safely clean it themselves or if they risk leaving hidden damage that requires professional repair.

Overview
People affected14 accounts across 3 forums
Workarounds found33 items attempted
Community agreement106 total upvotes

What the numbers show

Counted from the threads quoted below. How we count

  • The most recent one is from October 2026.
  • This comes up 16.9× more often in r/Flooring than across the site as a whole.

What people tried

Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.

33 items+ Contribute

Found another way around this?

Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.

  1. 1
    spraying white vinegar or mold killer on the affected area
    Did this help you?
  2. 2
    wearing a respirator mask and using air purifiers
    Did this help you?
  3. 3
    scraping up adhesive and flooring down to the subfloor
    Did this help you?
  4. 4
    cutting out and replacing the damaged plywood subfloor entirely
    Did this help you?
  5. 5
    hiring a professional or inspector to assess the damage
    Did this help you?
  6. 6
    Using hydrogen peroxide or a mild chlorine bleach solution to kill the mold
    Did this help you?
  7. 7
    Renting a floor fan from Home Depot to dry out the subfloor
    Did this help you?
  8. 8
    Scraping or sanding the subfloor once dry to fix warping and make it flat
    Did this help you?
  9. 9
    Using PVC quarter round and silicone caulk
    Did this help you?
  10. 10
    Filling the tub with water before caulking
    Did this help you?
  11. 11
    Considering SPC vinyl tile over sheet vinyl for DIY approachability and durability
    Did this help you?
  12. 12
    Replacing the carpet repeatedly after each flood
    Did this help you?
  13. 13
    Considering epoxy or resin floors
    Did this help you?
  14. 14
    getting a mat to dry the surface
    Did this help you?
  15. 15
    using Luan paint to paint over the damage
    Did this help you?
  16. 16
    using blow dryers and towels
    Did this help you?
  17. 17
    stopping the active leak
    Did this help you?
  18. 18
    using a wet vac to remove standing water
    Did this help you?
  19. 19
    Drying the floor immediately and sucking up water with a vacuum
    Did this help you?
  20. 20
    Using multiple dehumidifiers
    Did this help you?
  21. 21
    Hiring a professional restoration specialist
    Did this help you?
  22. 22
    Pulling out the damaged wood and padding to prevent spores from spreading
    Did this help you?
  23. 23
    Using chlorine and mold removers to clean up the mold
    Did this help you?
  24. 24
    Spraying the affected area with mold killer
    Did this help you?
  25. 25
    Trying to cover over the damaged area
    Did this help you?
  26. 26
    Pulling up all the flooring and hitting the concrete with vinegar to kill mold
    Did this help you?
  27. 27
    Painting the subfloor with Killz primer to lock in odors and prevent further mold growth
    Did this help you?
  28. 28
    Cutting around the kitchen unit feet and laying laminate up to them
    Did this help you?
  29. 29
    Monitoring the area to ensure it stays dry before laying new flooring
    Did this help you?
  30. 30
    Scrubbing the affected area with bleach
    Did this help you?
  31. 31
    Soaking the area with a specialized mold killer
    Did this help you?
  32. 32
    Replacing the affected subfloor and drywall sections
    Did this help you?
  33. 33
    Hiring a plumber or remediation company
    Did this help you?
Tried another approach not listed above?+ Share your workaround ↑

In their words

Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.

r/HomeMaintenance5 people · September 2026

“The problem is we don’t have the money to fix it and specifically where the dip is in the concrete on the front porch I found this today.:-(”source ↗

KookyImagination7532 · r/HomeMaintenance · 22 upvotes

“Leaking toilet for god knows how long Black crumbly wood obviously failed the screwdriver test How urgent is subfloor repair? And does this mean ripping out the whole bathroom?”source ↗

“we stopped all active leaking. Now just thinking about repairs and if this looks like a whole bathroom remodel.”source ↗

Physical-Ad7719 · r/HomeMaintenance · 17 upvotes

“Toilet flooded so I ripped up the vinyl to let it dry because the water seeped underneath it, especially by the walls. Obviously this mold predates today’s flood. I don’t know shit about shit and I’m a young first time home owner. It seems like the mold is mostly “surface level” on some type of paper or something. This is in my laundry room and I need to figure this out asap but have no idea what to do”source ↗

Bluewoods22 · r/HomeMaintenance · 14 upvotes

“There's a gap between the flooring and the tub. I have 2 toddlers so bathroom time involves water going everywhere and I realized today the quarter round was letting water dip behind it and get to the subfloor. What can I do to protect the subfloor since it'll be years before the kids stop splashing in the tub?”source ↗

EngineConstant7926 · r/HomeMaintenance · 3 upvotes

“It’s definitely mold. It flooded when I was moving into this house 2 years ago and I regrettably did not lift the flooring. Today the bathroom flooded which is what prompted me to finally lift it so it could air out this time. Is this something I can easily do myself? I truly don’t know any handy skills at all but am willing to learn. Just want to make sure I get it done properly”source ↗

Bluewoods22 · r/HomeMaintenance · 2 upvotes

“Obviously I’m broke, and while trusting, a bit skeptical and want to get some extra opinions too before making any decisions”source ↗

“Just want a second opinion before making a decision, and ofc other things I can do.”source ↗

SomeGrumption · r/HomeMaintenance · 1 upvotes

“Yes, the seal was broken for a long time (previous owners). This is being fixed. Plumber said no other current leaks but looks like historic leak where they did not address damage.”source ↗

Physical-Ad7719 · r/HomeMaintenance · 1 upvotes
r/HomeImprovement6 people · September 2026 – October 2026

“Fast forward and now appears there is mold growing on the wood.”source ↗

Aldoom330 · r/HomeImprovement · 20 upvotes

“We also can't find clear guidance on installing vinyl tile in a bathroom in a way that actually protects the subfloor from water intrusion.”source ↗

“We've read that urine can get trapped in click-lock seams and cause a permanent odor.”source ↗

“Are there affordable, good-looking vinyl tile options that can be installed water-resistant enough for a bathroom? Are we chasing a unicorn, or are these concerns overstated?”source ↗

BakerPopular1658 · r/HomeImprovement · 2 upvotes

“You have to spray that with a mold killer.”source ↗

ifixallthings · r/HomeImprovement · 2 upvotes

“I found a leaking toilet flange that I'm fixing, but I'm a bit concerned about some of the black stuff around the flange and on the drywall-facing surface of the joist.”source ↗

“If this is mold, should I scrub it with some bleach, or call a remediation company?”source ↗

non-newtonian · r/HomeImprovement · 2 upvotes

“looks like mold.. need a mold killer to soak in and kill it. bleech just like kills the outermost layer.. it rarely kills all of it.”source ↗

hijinks · r/HomeImprovement · 2 upvotes

“Replace that section of floor and repair flange. Not too hard. Plumber will probably do it. Just make sure you tell them you want that rotted wood replaced.”source ↗

totalhhrbadass · r/HomeImprovement · 1 upvotes
r/Flooring4 people · September 2026 – October 2026

“I don’t know shit about shit and I’m a young first time home owner.”source ↗

“This is in my laundry room and I need to figure this out asap but have no idea what to do”source ↗

Bluewoods22 · r/Flooring · 5 upvotes

“My problem is the carpet, and the fact my basement will flood with city runoff sewer about once a year since 2020.”source ↗

“We have replaced the very nice carpet the fourth time now.”source ↗

“The biggest issue with this carpet is it will retain the squish after flooding and then MUCH of the drywall must be replaced”source ↗

only1tacynne · r/Flooring · 3 upvotes

“I can't help but worry about mold.”source ↗

“Something seems to be growing around the edges of some of the transitions now that it's been about 3 days, but I can't tell if it's just hard water deposits or mold.”source ↗

sleepy_time_junction · r/Flooring · 3 upvotes

“So I’ve just bought this house and lifted up the existing flooring and this is what it looks like under neath in the kitchen diner, it smells horrible like mould and damp, as in I have to cover my nose when walking into the room because it’s making me gag a little.”source ↗

“Idk what to do to fix this.”source ↗

Late-Pickle-1118 · r/Flooring · 3 upvotes

“I'm worried about the edges and transitions though.”source ↗

sleepy_time_junction · r/Flooring · 1 upvotes

“I don’t know how I’d pull up the chipboard looking stuff because the kitchen units are fitted ontop of it 😭”source ↗

Late-Pickle-1118 · r/Flooring · 1 upvotes

Where this came up

People with this problem also raised