For most homes, interior insulation techniques are often used. However, interior insulation — or basement renovations in general — should never be done on a basement that has moisture problems.

That's one of the most popular questions I get asked by readers. One, from Longlac, Ont., wrote in to ask how far he had to go down his basement wall with interior insulation.

Field Monitoring and Hygrothermal Modeling of Interior Basement Insulation Systems. In Thermal Performance of the Exterior Envelopes of Whole Buildings X International Conference (p. 15).

The problem you’re having is quite common and I blame it on a poor approach to insulation. Not all homes with fiber batts and vapour barrier in the basement have this issue, but many do. In my ...