In-Unit Condensation

Dear Residents,  

Customer Service has asked that we highlight a section of the Tarion guideline that focuses on condensation in the Unit, please see below:

Section 8.5
Condensation occurs when water vapour in indoor air contacts cool surfaces such as window glass. Condensation on interior window surfaces is common during cold seasons. When outdoor temperatures are well below freezing, ice may form at the bottom of the window. Since it is important for homeowners to maintain proper humidity levels within the home to prevent damage to other components such as hardwood flooring and for physical health, some condensation on windows may be expected. Indoor humidity levels may be controlled by dehumidification, ventilation or air conditioning. Interior air moving over the windows can help control condensation. Heavy draperies or window coverings that cover windows and block heat diffusers can prevent air flow. Running the furnace fan continuously in conjunction with the principal exhaust fan can also help to control condensation on windows.

A3 Moisture and Windows This chart identifies the maximum relative humidity for a given inside temperature above which condensation will form on windows. For additional information, see the following guides: “Moisture and Air, Problems and Remedies” by Canada Mortgage and Housing Corporation, or “Fenestration Products: Condensation and Humidity” by Natural Resources Canada.

Inside Temperature
	20◦C		22◦C		24◦C
MAXIMUM RELATIVE HUMIDITY (%)
OUTSIDE TEMPERATURE (◦c)	SINGLE   GLASS	DOUBLE GLASS	SINGLE GLASS	DOUBLE GLASS	SINGLE GLASS	DOUBLE GLASS
-35	3	18	3	18	3	18
-29	5	23	5	22	5	21
-23	8	27	7	26	6	25
-18	12	33	11	31	10	29
-12	17	39	16	37	15	35
-7	24	46	23	44	22	42
-1	34	55	32	52	30	49