What Causes Mold in a House? A Simple Guide

Did you know mold in your home can cause health problems? If you want to learn about the causes of mold, we can help.

In this guide, we’ll go over what causes mold in a house.

Want to learn more? Keep reading.

High Humidity

If you live in a spot where it’s humid, you could have mold. High moisture content in the air can become a breeding ground for mold. Mold will grow on ceilings, walls, under the kitchen sink, and in dark closets.

Mold caused by humidity’s expected if you live near a massive body of water or the ocean. The moisture can worsen if you have poor ventilation.

Leaking Water Pipes

Another common cause of mold under the cupboard and behind drywall is leaking pipes. Leaks can contribute to wall or ceiling mold. The leak could come from the piping or geyser in your roof.

If you notice mold on your ceiling or walls, investigate whether it’s a leaking pipe.

Roof Leak

Over time, roofs can get damaged from severe weather conditions. High winds and hail can loosen the shingles on your roof. After a storm, you might not even see the evidence of loosened shingles. Yet weakened shingles can allow water to seep below. A slow leak will cause moisture to buildup in your attic or ceiling.

The mold will begin to grow on ceiling boards and walls.


During winter, some homes experience a lot of condensation on cold surfaces.

These cold surfaces include floor tiles, brick walls, metal piping, and concrete surfaces. If you notice condensation in your home, you’ll want to make sure you’re ventilating each room.

Otherwise, mold spores or mold can spread.

Poor Ventilation

A home that’s not well-ventilated will become a magnet for mold growth and mold spores. The stagnant air in your home creates an environment for mold to grow well. Make sure you have a way to get rid of steam from bathrooms and cooking appliances.

Otherwise, the humidity will leave your home feeling sticky and damp. Try to get rid of the moisture with a dehumidifier.

Damp Basement and Mold Growth

Basements contain higher amounts of moisture because they aren’t well-ventilated. Your basement tends to be colder as well. More condensation can occur, leading to humidity and dampness.

Water from leaks in your home will run down to the basement. Mold can grow in the basement but can remain undetected for a while. Keep a dehumidifier running in your basement.

If you’re unsure if there’s mold in your home, consider mold testing.

Now You Know What Causes Mold in a House

We hope this guide on mold causes was helpful. Look out for leaks and mold growth on your walls and ceilings. Now that you know what causes mold in a house, make sure you keep your home well-ventilated.

Don’t forget to keep browsing our other helpful resources on real estate, home, and more.

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