Add Insulation To Cold Surfaces
Why Should I Worry About Moisture Problems? Does My House Have a Moisture Problem? Reduce Moisture Sources Inside The Home Add Insulation To Cold Surfaces Reduce Uncontrolled Air Leakage Install Effective Ventilation Systems Basic Facts About Moulds Upgrade Or Replace Windows Check For Moisture Entry From Other Sources Keep The Air Circulating Get Rid Of Mould Basic Facts About Moisture Keep Humidity Levels Within A Healthy Range Use Dehumidifiers Wisely Moisture Problems, Don't Become a Statistic!
Areas that are uninsulated or poorly insulated, such as exterior corners or foundation walls, can be improved with additional insulation. This may be expensive by itself, but can be incorporated as part of a renovation. Don't forget to install an air/vapour barrier (usually polyethylene) on the room side of the insulation to prevent hidden condensation behind the insulation.

Insulating a thermal bridge
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thermal bridge at exterior corner in closet
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add insulation (plus polyethylene and drywall)
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