Mould growth on the attic sheathing has become increasingly more common as homes have become more energy efficient.  Mould growth on the attic sheathing is caused by a build up of warm moist air from the living space into the attic cavity of the home.  The warm moist air in the attic cavity comes into contact with the cold surface of the attic sheathing and condenses on to the surface of the attic sheathing creating an ideal environment for mould growth.   Warm moist air builds up in an attic cavity because of the following:

• Improper or lack of soffit venting.
• Improper or lack of roof vents.
• Bathroom exhaust fan venting directly into the attic cavity.
• Insulation blocking soffit venting in attic cavity.
• Improper or lack of rafter vents/baffles
• Minimal insulation within the attic, allowing increased warm moist air into the attic.
• Improper or lack of Vapour barrier

EnviroSolve Canada Inc. will perform a free evaluation of your attic cavity to determine the causes of mould growth within your attic cavity and provide a no obligation estimate to remove mould growth and repair the causes of the build up of warm moist air in the attic cavity.