As temperatures drop, a little home maintenance can help you manage moisture, prevent avoidable damage, and catch potential problems before they become bigger concerns.
Colorado winters bring colder temperatures, snow, and plenty of reasons to spend more time indoors. They can also bring home maintenance challenges that are easy to overlook, especially when it comes to moisture.
Mold can develop when excess moisture is left untreated. Condensation around windows, plumbing leaks, damp basements, and poor ventilation can all contribute to conditions where mold may grow.
The good news is that homeowners can take practical steps before winter arrives to identify potential trouble spots and reduce moisture inside the home.
Here is what I would recommend checking as part of your fall and winter home preparation.
Why Can Mold Become a Problem During Winter?
Mold needs moisture to grow. During colder months, warm indoor air can meet cold surfaces, such as windows and exterior walls, causing condensation. If that moisture repeatedly collects and the area does not dry properly, it can create conditions that support mold growth.
Winter can also make certain problems harder to notice. A small roof leak, damp basement corner, or plumbing issue behind a cabinet may go undetected while homeowners focus on keeping the house warm.
That is why it helps to inspect the areas where moisture is most likely to collect before temperatures fall further.
1. Check Windows and Exterior Walls for Condensation
Windows are a good place to start because condensation can be an early sign of excess indoor humidity or cold surfaces.
Look for:
- Water collecting on window glass or sills.
- Dampness around window frames.
- Peeling paint, discolored trim, or soft materials.
- Musty smells near windows or exterior walls.
- Repeated condensation that returns after being wiped away.
Wipe away condensation when it appears and investigate why it is happening. Persistent moisture may indicate that indoor humidity is too high, ventilation is inadequate, or the window assembly needs attention.
Also check for damaged caulking or weatherstripping that may allow drafts or water intrusion. If you suspect a leak or hidden moisture, address the underlying issue rather than simply covering the affected area with paint.
2. Inspect the Roof, Gutters, and Drainage
Water entering from outside can create problems long before mold becomes visible.
Before winter weather becomes more severe, inspect your roof from a safe location or arrange a professional inspection if needed. Look for missing or damaged shingles, deteriorated flashing, and other signs of potential water entry.
You should also:
- Clear leaves and debris from gutters.
- Check that downspouts direct water away from the foundation.
- Look for pooling water near the house.
- Check visible exterior caulking around windows and doors.
- Pay attention to water stains on ceilings or upper walls.
Do not climb onto an icy or steep roof to inspect it yourself. Hire a qualified professional when access or safety is a concern.
3. Look for Moisture in Basements and Crawl Spaces
Basements and crawl spaces deserve special attention because moisture can remain hidden for a long time.
Watch for musty odors, damp surfaces, water stains, efflorescence (a white, powdery deposit on masonry), peeling paint, or visible mold. Check around foundation walls, floor drains, sump pumps, and accessible plumbing.
If your home has a history of water intrusion, review what was done to correct the original problem. A dehumidifier may help manage humidity in some situations, but it will not solve a foundation leak or drainage problem on its own.
If you find moisture, identify the source and correct it. Repeatedly drying the same area without fixing the cause can allow the problem to return.
4. Make Sure Bathrooms and Kitchens Are Properly Ventilated
Everyday activities such as showering, cooking, and washing dishes add moisture to indoor air.
To help manage it:
- Run bathroom exhaust fans during showers and afterward.
- Use kitchen exhaust ventilation when cooking, especially when boiling water.
- Make sure exhaust fans vent outdoors rather than into an attic or another enclosed space.
- Check that fans are clean and functioning properly.
- Avoid drying large amounts of laundry indoors without adequate ventilation.
If mirrors, windows, or nearby walls regularly remain wet after routine activities, review your ventilation and humidity levels.
5. Check Plumbing Before Cold Weather Arrives
A small plumbing leak can create enough moisture to cause damage inside cabinets, walls, and floors.
Check beneath kitchen and bathroom sinks, around toilets, behind accessible appliances, and near exposed plumbing connections. Look for drips, swollen cabinetry, discoloration, and unexplained musty odors.
Before freezing temperatures arrive, protect vulnerable pipes according to your home's needs. Insulate exposed pipes where appropriate, seal drafts near plumbing, and know where your main water shutoff is located.
If a pipe freezes or bursts, shut off the water if it is safe to do so and contact a qualified plumber. Dry affected areas quickly and arrange appropriate water-damage remediation when needed.
6. Keep Indoor Humidity Under Control
Indoor humidity is one of the most useful things homeowners can monitor during winter.
The U.S. Environmental Protection Agency recommends keeping indoor humidity below 60%, ideally between 30% and 50% when practical. A small hygrometer can help you monitor levels in rooms that tend to feel damp.
Consider these steps:
- Use a dehumidifier if needed and follow its maintenance instructions.
- Vent moisture-producing activities outdoors.
- Address condensation as soon as it appears.
- Keep air circulating around furniture and stored items.
- Avoid pushing large pieces of furniture tightly against cold, damp exterior walls when airflow is limited.
If windows continue to collect moisture despite these steps, you may need to investigate ventilation, indoor humidity, insulation, or other building conditions.
7. Know the Early Warning Signs of Mold
Visible mold is not the only reason to investigate a moisture problem.
Be alert to:
- A persistent musty or earthy smell.
- Dark, green, or unusual spotting on walls, ceilings, window trim, or other materials.
- Peeling paint or bubbling drywall.
- Warped flooring or swollen cabinetry.
- Recurring damp patches.
- Water stains that return after being cleaned or painted over.
These signs do not all prove that mold is present, but they are good reasons to investigate the source of the moisture.
Avoid simply painting over stains or applying a surface cleaner without understanding what caused the problem. Hidden moisture can continue damaging materials even when the surface looks better.
8. What Should You Do If You Find Mold?
The first step is to stop the moisture source. That may mean repairing a leak, improving ventilation, correcting drainage, or drying an area that became wet.
Small areas of mold on suitable hard surfaces may sometimes be cleaned safely, provided the underlying moisture problem is corrected. Follow appropriate safety precautions and product directions. Porous materials may be difficult or impossible to clean completely.
Consider professional assistance if the affected area is extensive, the mold keeps returning, water damage involves contaminated water, mold is suspected inside walls or ventilation systems, or anyone in the household has health concerns that make exposure especially important to avoid.
The EPA advises drying wet materials within 24 to 48 hours when possible to help prevent mold growth. If a large area is affected or you suspect hidden contamination, seek qualified guidance rather than disturbing the material yourself.
When Should You Call a Professional?
According to the U.S. Environmental Protection Agency (EPA), homeowners may be able to clean small mold-affected areas measuring less than approximately 10 square feet, depending on the circumstances.
However, if the affected area is larger, mold keeps returning, or the home has experienced extensive water damage, it may be time to contact a qualified mold remediation professional. Mold associated with contaminated water or suspected growth inside HVAC systems also requires special precautions.
If anyone in your household has asthma, allergies, respiratory conditions, or other health concerns that could increase their sensitivity to mold exposure, consider speaking with a healthcare professional before attempting cleanup.
Most importantly, remember that cleaning visible mold is only part of the solution. Identifying and correcting the underlying moisture problem is essential to helping prevent it from returning.
9. Your Pre-Winter Mold Prevention Checklist
- Inspect windows, sills, and exterior walls for condensation.
- Check under sinks and around toilets, tubs, and appliances for leaks.
- Clear gutters and confirm downspouts direct water away from the foundation.
- Look for dampness, water stains, and musty odors in basements and crawl spaces.
- Test bathroom exhaust fans and use kitchen ventilation.
- Check that clothes dryers vent outdoors.
- Monitor indoor humidity with a hygrometer.
- Inspect accessible pipes and prepare vulnerable plumbing for freezing temperatures.
- Make sure furniture and stored items allow airflow near exterior walls.
- Arrange professional help for persistent moisture, recurring mold, or significant water damage.
You do not need to complete every home maintenance task in one day. Working through the checklist room by room can help you identify small concerns before they become more expensive repairs.
A Little Preparation Can Go a Long Way
Winter home maintenance is not only about keeping the heat on and the snow outside. It is also about understanding how your home handles moisture and responding when something does not look or smell right.
Regular inspections, proper ventilation, humidity control, and prompt repairs can reduce the conditions that allow mold to grow. And when a problem is beyond a simple maintenance task, getting the right professional involved early can help prevent further damage.
If you are preparing to sell your home, seasonal maintenance is also a good opportunity to address visible concerns and keep records of repairs. If you are buying, moisture stains, musty odors, and signs of past water intrusion are worth asking about during the inspection process.
At The Kissel Group, we believe understanding the full picture of a property helps buyers and sellers make more confident decisions. If you are thinking about buying or selling in Lakewood or elsewhere in the Denver metro area, reach out to Madison Kissel and The Kissel Group at Compass. We would be happy to help you navigate your next move.
