Throughout our years in the environmental consulting field we realized that most homeowners RARELY go inside their attics – if ever. A significant majority of these homeowners are not even aware of whether they have proper ventilation to regulate their attic’s temperature and, IF they were to go inside their attic, many of them wouldn’t know exactly know what warning signs to look for. Without proper insulation and ventilation, problems regarding moisture and condensation can create a variety of problems in your attic that can directly harm your living area and your wallet. Finding condensation in your home is a common issue that every homeowner encounters. Common signs of condensation include:


  • Streaming windows

  • Damp patches on walls, especially behind furniture and in corners

  • Wallpaper can start to peel off

  • Black dots on window frames

  • Mould growth, usually black mould, starts to appear

  • Soft furnishings and fabrics become prone to mould and mildew

What creates condensation?

Condensation is created when warm, moist air merges with another air and/or surface that has a colder temperature which doesn't allow it to retain the same amount of moisture as it originally did, leading to the release of water into the cold air and/or cold surface which creates the condensation effect.

How does condensation affect my attic?

Once it forms in your attic, condensation begins to damage the surfaces located inside of it – attics contain wooden surfaces as well as ductwork which are both organic sources of protein for bacteria, such as molds, to begin thriving. (See Mold Prevention for more information)

What are signs to look for when I suspect there is condensation in my attic/home?


  • Odors: Musty/moldy/damp odors that do not go away – or -- are noticeable when your A/C is running.

  • Mold Spots: Thread-like clusters of small, black/green/brown/white dots and/or spots on surfaces and items.

  • Water lines: Noticeable water lines throughout surfaces, could be yellow or clear.