Lesson 1
How a House Keeps Water Out
See why an old solid wall soaks up rain and dries out again, why a cavity wall drains instead, and why sealing the wrong one makes it wetter.
Predict
The front wall of a Victorian terrace is solid brick. It gets soaked in every storm, yet the rooms behind it have stayed dry for 130 years. A new owner has it covered in cement render “to keep the rain out”.
Five years later, what has happened to the water in the wall?
Choose a prediction, then select Next to see the answer.