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Common Causes of Attic Mold in the Summer

Published on July 07, 2025

As the mercury rises, so does the likelihood of attic mold growth. The summer months are one of MoldTech’s busiest seasons, with many attic mold removal jobs on our schedule. There are several reasons why mold growth takes off in the summer months and why the attic is especially vulnerable. Today on the blog, our team is sharing the four top causes of attic mold in the summer and why mold removal in Bradford is the only safe way to permanently treat and remove it. 

Excess Heat and Summer Humidity

attic mold removalMold grows better in warm and humid conditions, and in Southern Ontario, nothing gets more hot and humid than July. The attic acts like a hat for your house, providing a barrier that both repels the sun and protects your air-conditioned rooms. When the attic is affected by mold, this barrier ceases to function effectively, resulting in increased humidity, heat and moisture. Summer humidity can accelerate mold growth, which then continues to damage insulation, sheathing, and other necessary elements of the attic. 

Roof Leaks From Summer Storms

Heavy summer storms can damage and dislodge shingles or flashing, creating additional moisture problems in the attic. Minute leaks can be really challenging to spot from the exterior of your home because of the angle and distance you are observing. Inside, the attic is dark, hot, and difficult to navigate, and these interior and exterior factors can combine to make roof leaks especially challenging. Mold growth in the attic is best spotted with the professional tools and methods we use at MoldTech. Our thorough mold testing ensures that damp areas or loose and missing shingles are spotted right away. 

Poor Ventilation and Blocked Vents

Heat and leaky roofs are only half of the equation when it comes to attic mold in the summer — blocked vents and poor ventilation are the other half. Built correctly, attics should breathe; airflow is a critical element of how they remain cool and dry all year round. But, due to age, materials, or construction, many attics across Bradford may actually trap moisture and heat instead of expel it. When this system is out of balance, all of the hot and moist air is trapped within, accelerating mold growth. 

Exhaust Fans and HVAC Problems

Having an exhaust fan in your kitchen or bathroom is one of the best ways to prevent mold growth — unless it ends in the attic. Vents need to end at your home’s exterior to ensure that excess hot and warm air is not funnelled into the attic. It’s worth paying attention to the location of your HVAC, too: condensation from units or piping in the attic may add moisture.

Preventative Tips and Professional Help

At MoldTech, we’ve been helping folks with mold removal in Bradford for over a decade. We suggest all homeowners do three simple things to prevent attic mold in the summer: 

  • Keep your indoor humidity balanced at 50%. 
  • Do a visual inspection of your roof after a storm. 
  • Ventilate your home by keeping the air moving. 

Early mold detection and remediation are key to preventing a costly attic mold removal. If you have questions or concerns about your attic, our trustworthy and professional team is ready to help with attic inspections or mold testing. We’ll assess the exterior and interior of your home to root out hidden mold infestations or areas at risk of developing mold. If you suspect you have a mold problem, don’t wait to have it assessed — let MoldTech safely remove it for you. 

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