Mold, Mildew

Published on April 15th, 2014 | by Henri

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Mold in the window casings of a tight house

Q.    We built our home and have lived in it for 4 years now. The contractor is very environmentally minded and created an exceptionally tight house. It seems that during the colder months, we develop mold on the wood casings of our windows during the nights, especially the ones with blinds or shades.

We’re very concerned about the “rot-factor”, and, more importantly, the baby seems to have developed an allergy to the mold. Can you let us know how we can cure this problem, regarding both air-quality and wood preservation?

A.    The blinds and shades trap ambient moist air between the blinds and the windows. During the night, this air cools and its relative humidity increases to the point where it encourages mold growth.

You could leave the shades and blinds up to see if this solves the problem. But it sounds as if you need an air-to-air heat exchanger. This can be a whole-house system or one or more individual room units, depending on your house design.

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