By Patriot Home Service. Published: . Updated: . Published by Patriot Home Service.
Distinguish room-side moisture, exterior condensation and moisture between panes before choosing a response.
Distinguish room-side moisture, exterior condensation and moisture between panes before choosing a response.
Room-side condensation can occur when indoor moisture meets a cold glass surface. Exterior condensation can occur when the outer glass surface cools below the outdoor dew point. Moisture or fog between sealed panes may indicate a problem with the insulating glass unit. These conditions look similar at a glance but do not have the same cause or remedy.
Record the weather, room humidity concerns and whether condensation clears later in the day. Cooking, bathing, blocked airflow and indoor drying activities can add moisture. Check that required exhaust ventilation works and discharges outdoors. Recurring water on frames or adjacent materials matters because the resulting moisture damage may continue even if the glass becomes clear.
Clean accessible tracks and weep paths only as directed by the manufacturer. Use compatible weatherstripping and avoid filling drainage openings with caulk. Sticky operation can result from dirt, worn hardware or frame movement; forcing a sash may damage it. A glazing repair may be possible for some products, but exact model and condition affect the options.
Do not lean out of upper-story openings or handle heavy glass without appropriate training. Condensation alone does not establish the cause of hidden frame damage.
These references provide supporting guidance and further reading. Follow current local requirements and the instructions for your exact products; some publications address particular materials, products or code editions.