PERFORMANCE GUIDELINES: 1. FOUNDATION/BASEMENT

1.13 Condensation in Crawl Space

Acceptable Performance/Condition

Occasional condensation in itself is not considered abnormal. Typical temporary conditions that may contribute to condensation are:

• Cool air may enter an unheated crawl space and cool interior surfaces of the space. When outdoor temperatures rise, moisture laden warm air may be carried into the crawl space and condense on the cool surfaces;
• At night in heated crawl spaces, outside air may rapidly cool foundation walls and cool the interior surface on which moisture can condense;
• If the house is left unheated, the floors and walls may provide cold surfaces on which moisture in the warmer crawl space may condense, or;
• Stored materials obstructing ventilation airflow.

Crawl spaces shall be conditioned or ventilated in accordance with the Building Code.

If condensation results from a defect in design materials or labour or a Building Code violation, then action to address the defect and any related damage caused by the condensation is required.

Excessive condensation should not accumulate on crawl space interior surfaces for extended periods.

Warranty Coverage

• 12 months In-Home
• 15 months Common Property

Damage caused by dampness or condensation due to failure by the owner to maintain adequate ventilation or humidity levels as may be set out in maintenance documentation provided to the owner is not covered under warranty.

Ventilation requires careful management by the owner to maintain acceptable moisture levels.

Claim Response

Condensation in a crawl space not meeting the Acceptable Performance/Condition must be rectified. Construction defects that cause condensation are to be rectified.

Maintenance Tip

Controlling humidity levels within the home is important in order to avoid condensation problems. Open windows to ventilate and use exhaust fans.