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.
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.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
- 1spraying white vinegar or mold killer on the affected areaDid this help you?
- 2wearing a respirator mask and using air purifiersDid this help you?
- 3scraping up adhesive and flooring down to the subfloorDid this help you?
- 4cutting out and replacing the damaged plywood subfloor entirelyDid this help you?
- 5hiring a professional or inspector to assess the damageDid this help you?
- 6Using hydrogen peroxide or a mild chlorine bleach solution to kill the moldDid this help you?
- 7Renting a floor fan from Home Depot to dry out the subfloorDid this help you?
- 8Scraping or sanding the subfloor once dry to fix warping and make it flatDid this help you?
- 9Using PVC quarter round and silicone caulkDid this help you?
- 10Filling the tub with water before caulkingDid this help you?
- 11Considering SPC vinyl tile over sheet vinyl for DIY approachability and durabilityDid this help you?
- 12Replacing the carpet repeatedly after each floodDid this help you?
- 13Considering epoxy or resin floorsDid this help you?
- 14getting a mat to dry the surfaceDid this help you?
- 15using Luan paint to paint over the damageDid this help you?
- 16using blow dryers and towelsDid this help you?
- 17stopping the active leakDid this help you?
- 18using a wet vac to remove standing waterDid this help you?
- 19Drying the floor immediately and sucking up water with a vacuumDid this help you?
- 20Using multiple dehumidifiersDid this help you?
- 21Hiring a professional restoration specialistDid this help you?
- 22Pulling out the damaged wood and padding to prevent spores from spreadingDid this help you?
- 23Using chlorine and mold removers to clean up the moldDid this help you?
- 24Spraying the affected area with mold killerDid this help you?
- 25Trying to cover over the damaged areaDid this help you?
- 26Pulling up all the flooring and hitting the concrete with vinegar to kill moldDid this help you?
- 27Painting the subfloor with Killz primer to lock in odors and prevent further mold growthDid this help you?
- 28Cutting around the kitchen unit feet and laying laminate up to themDid this help you?
- 29Monitoring the area to ensure it stays dry before laying new flooringDid this help you?
- 30Scrubbing the affected area with bleachDid this help you?
- 31Soaking the area with a specialized mold killerDid this help you?
- 32Replacing the affected subfloor and drywall sectionsDid this help you?
- 33Hiring a plumber or remediation companyDid this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“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 ↗
“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 ↗
“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 ↗
“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 ↗
“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 ↗
“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 ↗
“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 ↗
“Fast forward and now appears there is mold growing on the wood.”source ↗
“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 ↗
“You have to spray that with a mold killer.”source ↗
“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 ↗
“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 ↗
“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 ↗
“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 ↗
“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 ↗
“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 ↗
“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 ↗
“I'm worried about the edges and transitions though.”source ↗
“I don’t know how I’d pull up the chipboard looking stuff because the kitchen units are fitted ontop of it 😭”source ↗
Where this came up
People with this problem also raised
- 6How to get rid of a lingering musty smell after water damage
- 8Why are my metal floor vents sweating and growing mold?
- 14Rain ruined the wood floor in my rental, what happens now?
- 13How to clean mold on drywall or know when to cut it out
- 18How to get rid of severe black mold on bathroom grout
- 26How to clean mold on furniture after rain gets inside