How to Remove Mold From Carpets

Figuring out how to remove mold from carpets before it works its way into the flooring underneath can be the difference between a few hours of work and a six-figure repair bill for your building. 

Mold feeds on moisture and organic material. Unfortunately, commercial carpet provides both of those when people track in rain/snow or spill drinks/food. Mold can work through the fibers once it takes hold, getting into the backing and eventually making its way through to the pad.

The good news is you can fix carpet mold fairly easily if you work fast upon noticing the first signs of it. It could be as simple as picking up a carpet spotter for small affected areas with mold sitting on the surface. Or, you might need a self-contained carpet extractor to pull mold spores out of the carpet in bigger areas.

Either way, SweepScrub has the equipment, supplies, and know-how you need to address moldy carpets. Learn what kills mold on carpet below and how to get mold out of carpets fast!

Key Takeaways

• The first step in removing mold from carpets is finding and fixing the source of the moisture.
• White vinegar and hydrogen peroxide can help remove mold without damaging most carpet fibers.
• Always wear an N95 respirator, gloves, and eye protection when handling moldy carpets.
• Carpet mold covering more than 10 square feet or reaching the subfloor may call for professional remediation.
• Extracting all moisture after treatment is non-negotiable - otherwise, the mold will just return.

Early Signs of Carpet Mold

Carpet mold can look quite innocuous at first, which is part of the problem. It’s likely spread further than it needed to by the time you actually notice something is amiss. You probably smell it first - a sort of persistent, musty odor from a room. The other signs to watch for include:

• Dark or discolored patches on the carpet surface, especially near walls, under furniture, or around HVAC vents
• Damp or soggy-feeling carpet long after any visible moisture has been wiped up
• People complaining about allergy symptoms (sneezing, congestion, watery eyes) that get better when they leave the room
• Visible mold on baseboards or walls near the carpet, suggesting contamination has spread to the flooring. 

You can pull back a corner of the carpet and check the pad underneath if you want to quickly confirm or rule out the problem. Any discolored, damp, or visible growth on either side of the pad suggests mold has moved past the surface. 

How to Remove Mold From Carpets: Step-by-Step Guide

Addressing carpet mold is actually fairly straightforward. We advocate for a three-phase process:

1. Kill it
2. Extract the dead spores from the fibers
3. Completely dry everything 

Skipping any phase is merely applying a band-aid to the problem. Let’s start with what kills mold in carpets before getting into the actual steps on how to remove mold from carpets.

What Kills Mold in Carpets?

You have quite a few cleaning agents at your fingertips if you want to kill mold on contact. But it’s not as simple as grabbing the first thing you have nearby. You need to kill mold without harming the carpet fibers in the process. Here are a few options to weigh:

• White vinegar (undiluted): Safe for most carpet fibers. Will not bleach color. Apply it neat, let it sit, and the acetic acid will handle the rest. The smell can be quite strong, but don’t worry - it tends to diminish as the carpet dries.
• Hydrogen peroxide (3%): A really powerful antifungal that begins fizzing when it contacts mold. Put it right where you have a mold problem, give it 10-15 minutes to work its magic, and then blot and extract. Be aware it may lighten some carpet dyes. Spot test it first.
• Commercial anti-microbial carpet cleaners: Specifically made to address carpet mold without causing discoloration. Our range of commercial carpet cleaning chemicals features surfactants to loosen the mold’s grip on fibers while antimicrobial agents actually kill mold spores. Follow strict guidelines (per the bottle) for dilution/dwell time.
• Baking soda: It won’t kill mold itself, but it does a really good job sucking up moisture and odors. You might want to sprinkle it on post-treatment as a follow-up.

One word of warning: you’ll see bleach recommended quite a bit for online searches regarding what kills mold in carpets. Yes, it works. But effectiveness comes at the cost of stripping color from most dyes and leaving your carpet looking a mess. It doesn’t penetrate porous fibers very well, either, so some spores can be left behind to continue colonizing. 

What Else You’ll Need For Moldy Carpets

• N95 respirator: Mold spores go airborne the moment you disturb them and you definitely don’t want to inhale them. A typical cloth mask won’t cut it. 
• Rubber gloves and eye protection: Working around mold and cleaning chemicals requires both of these PPE.
• Carpet extractor: You can target specific areas and control exactly where the solution goes using a carpet extractor with wand. A self-contained unit covers full rooms without separate hose connections for wall-to-wall treatment.
• Stiff brush or carpet rake: For working the cleaning solution down into the fibers before extraction.
• Fans and dehumidifier: Fast drying after extraction prevents regrowth. You’ll end up right back where you started without airflow and dehumidification.
• Plastic sheeting and tape: To isolate the affected area and keep spores from migrating to clean sections of the building.
• Utility knife: If sections of carpet or pad need to be cut out and replaced.

Step 1) Contain the Area

The mold has already proven to be a problem, so prevent it from spreading anywhere else in your building. This means sealing off the affected section with plastic sheeting and tape. Mold spores scatter really easily and will take over elsewhere if given the opportunity. It’s a good idea to close off HVAC vents in the room so the system doesn’t relocate mold spores while you work.

Step 2) Ventilate

Open windows if the room has them, and set fans pointing outward to create negative pressure to let air flow out of the room rather than into the rest of the building. Fresh air for you, spores pushed outside. Win, win.

Depending on how severe the mold outbreak is, you may consider investing in a HEPA air scrubber to create a negative chamber. 

Step 3) HEPA Vacuum the Surface

Pick up loose spores and debris from the affected carpet using a HEPA-filtered vacuum. A typical vacuum cleaner will just blow spores all over the place. Vacuum slowly and go over each section multiple times. Do this before you apply any carpet mold killer. 

Step 4) Apply the Cleaning Solution

Spray or pour your chosen solution directly onto the moldy carpet fabric. Be generous if you’re using hydrogen peroxide or vinegar. The solution has to fully saturate the fibers, not just dampen the surface. As for commercial cleaning agents, you want to be more precise. Follow the specific instructions for dilution ratios. 

Work the solution into the carpet using a stiff brush. Then, give it time to work its magic killing the mold. 10-15 minutes is a commonly recommended dwell time.

Step 5) Extraction

Run your carpet extractor over the treated area to pull the cleaning solution, dead mold, and moisture from the fibers. Make overlapping passes and take your time. Slow and steady wins the race. It’ll save you time in the long run from having to do the job again.

Work the wand across small areas in straight lines until the recovery water runs clear. You’ll need to invest in a self-contained extractor for larger areas. Otherwise, you’d end up stopping frequently to empty the tank. 

Step 6) Inspect and Repeat

Take a look at the affected area once the carpet is dry. Do you still smell anything musty? Is there any lingering discoloration? The mold wasn’t fully killed or extracted if you answer yes to either of those questions. You may have to repeat steps 4-6. 

When Mold Spreads Beneath the Carpet

If you followed our guide on how to remove mold from carpets twice and still haven’t seen the results you had hoped for, there is a good chance that the mold has penetrated the pad or subfloor. Surface treatment alone won’t be enough to fix the issue.

Unfortunately, the pad almost always needs to come out if mold has reached it. Carpet padding is very porous and can absorb even just a little bit of moisture and mold. It’ll never fully dry once it has become saturated. Cleaning it only pushes the problem deeper.

Pull back the carpet in the affected region and look at the pad. Discoloration, green/black spots, or crumbling material when you touch the pad are all signs it is contaminated. Cut the section out and replace it.

This is also a good sign you should inspect the subfloor. Concrete subfloors are fairly easy to clean with a mold-killing solution. Let the floor dry out all the way. Plywood subfloors, on the other hand, need full replacement if the mold has worked into the wood grain.

There are safety concerns at play. The EPA recommends professional remediation for any mold-affected area exceeding 10 square feet. The contamination has probably reached structural materials at this scale, and the spore count creates real health risks during removal.

Preventing Carpet Mold Going Forward

If you dealt with carpet mold once, there’s always a chance you could again. But you can learn from this experience and make it as unlikely as possible with a few preventative measures. It’s as easy as managing humidity, responding to spills ASAP, and keeping the carpet clean:

• Keep indoor humidity below 60%: Mold can’t thrive if humidity is too low. You may need to invest in a dehumidifier for your building if you struggle to keep it within an optimal range. Use a hygrometer to keep an eye on humidity. 
• Address moisture in real time: Don’t wait for water to dry out on its own, and never say “we’ll deal with that spill tomorrow.” Roof leaks, pipe breaks, flooding, or any spill needs to be cleaned up and dried within 24 hours. This is why it’s worth having a carpet extractor on hand - for emergencies. 
• Invest in regular carpet extraction: Speaking of carpet extraction, make it a habit to clean your carpets on a regular basis. At least 1-2 times a year - more if your carpets see a ton of foot traffic. This removes the soil and organic matter that mold feeds on.
• Replace HVAC filters: Mold spores can circulate through your ventilation. Maintain clean filters with MERV 8 rating or higher to trap spores before they have a chance to settle into carpet fibers.

Follow these tips, and you won’t have to worry about how to remove mold from carpets. You know what they say - an ounce of prevention is worth a pound of cure!

Bottom Line on How to Get Mold Out of Carpets

We hope this guide on how to get mold out of carpets helps you correct the issue and prevent it from popping back up in the future. Catch it early, kill it with the right cleaning agent, and thoroughly extract so the carpet dries all the way out. 

All that’s left to do now is set yourself up for success with the best commercial carpet cleaner and chemical agents at SweepScrub. We can help you pick the essentials for your exact needs. Get in touch today and put carpet mold in the past for good! 

Frequently Asked Questions

Can carpet with mold be saved?

Yes, as long as you act fast to prevent it from spreading to the pad/subfloor. Time is of the essence!

What kills mold permanently on carpet?

White vinegar, hydrogen peroxide, and commercial anti-microbial cleaners all kill active mold. But “permanently” depends on fixing the moisture source. What kills mold in carpets means nothing if you don’t address the leak, humidity, or drainage issue that caused it in the first place.

Should I clean carpet mold myself or hire an expert?

Depends on the scale of the issue and what equipment you have on hand. It’s worth hiring an expert for anything over 10 square feet, especially if you’d rather not buy your own carpet extraction machine. 

How did I end up with moldy carpet in the first place?

Moisture is the root cause of all moldy carpet problems. It could be a slow leak behind a wall, condensation from an HVAC unit, a flood that wasn't dried fast enough, or high ambient humidity in a room with poor circulation.

Is carpet mold dangerous?

It can be. Some people are particularly sensitive to mold spores. Black mold can produce mycotoxins that are even more serious. Understanding how to remove mold from carpets is non-negotiable if you have an issue. Don’t let it linger. 

Related Resources

How to use a carpet extractor | Cleaning commercial carpet tiles