June 2023
Each winter, high-rise residents contend with frost buildup and fog on windows, water running down glass and window frames, and staining and mould on ceilings or walls. There may also be wetness within exterior walls and deterioration of wood.
If your building suffers from pinhole and other water leaks, this contributes to these visible indicators of internal moisture.
The problem is excessive water vapour in the air of your home. Conversely, you may notice static electricity buildup, cracking furniture, or dry or scratchy throats which result from too little water vapour in the air.
Excessive or too little moisture in the air can be corrected.
Condensation problems occur because air holds a limited amount of water vapour. This amount varies with temperature such that cold air holds less water than warm air. Surface condensation results when there is excessive water vapour in the air. Air cooled when exposed to cold surfaces will retain less water vapour and leave some behind when in contact with glass or walls.
This surface condensation which is visible on windows, walls, ceilings and floors results from high building humidity. Air movement and moisture in the building is impacted by the building envelope and vapour barrier that prevents moisture from entering walls and ceilings from outside, and your HVAC system.
Household activities such as bathing and showering, washing clothes and dishes, and cooking all contribute to internal moisture as do plants and pets.
High humidity is a greater problem in high-rise communities with a more secure air barrier intended to make the home more airtight. There is less air leakage, which is good, and higher indoor humidity.
Solutions to moisture and condensation in a high-rise community are complex. Water leaks can be reduced or prevented by following a proper regimen of protecting and repairing pipes. Water detection systems help identify where water is accumulating so problems can be more quickly addressed. HVAC companies can ensure systems for managing air flow are operating properly.
