Why Your Windows Get Wet on the Inside

A wet windowsill on a dry morning raises a useful question: where did the water come from? Follow the difference between condensation, rain entry and other leaks, and learn how moisture, surface temperature and ventilation fit together. Explore The House Fieldbook: Shade, Airflow & Moisture, our illustrated guide with printable observation sheets and a free sample: https://house-fieldbook.pages.dev/ CHAPTERS 0:00 A Puzzling Wet Sill 0:54 Vapour You Cannot See 1:49 Where Cold Meets Moist 2:43 Relative to What 3:43 Dew Point Versus Room Reading 4:37 Why Windows Show It First 5:32 Locating The Wet Surface 6:33 Capturing Moisture At The Source 7:26 Slow, Everyday Sources 8:23 The Curtain Effect 9:15 When Opening A Window Helps 10:15 What Heating Actually Does 11:18 Dehumidifiers And Cooling Systems 12:20 When Rain Gets In Instead 13:17 Other Sources Of Water 14:15 Building An Observation Record 15:09 Keeping Comparisons Fair 16:02 Acting On What You Find 16:59 Three Limits Worth Remembering 17:56 Back To The Dry Morning SOURCES COND: https://www.yourhome.gov.au/passive-d... DEW: https://www.weather.gov/arx/why_dewpo... EPA: https://www.epa.gov/mold/brief-guide-... GLASS: https://www.yourhome.gov.au/passive-d... AIR: https://www.yourhome.gov.au/passive-d... IAQ: https://www.epa.gov/indoor-air-qualit... Visuals combine licensed real footage, original conceptual diagrams and a fictional AI presenter. Stock footage illustrates subjects; it does not show a measured experiment or diagnose a building. Outcomes depend on actual conditions and the complete building. #WindowCondensation #HomeMoisture #BuildingScience