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Weatherstrip Doors

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  rev. 2008-11-25        

Existing Conditions

Visual inspection and smoke pencil testing showed that a significant amount conditioned air is migrating in or out through gaps between doors and their frames.  This leads to drafts and discomfort in the door area, and also allows heating or cooling energy to escape.

Retrofit Conditions

Weather-stripping of doors, including sweeps on the bottom, is one of the most cost-effective energy conservation measures.  However, no weatherstrip lasts forever and life expectancy is especially short around high-use doors.  So only commercial grade products should be used, and replacement should be a regular maintenance item (generally every one or two years in high traffic doorways).

The following doors should be taken care of as soon as possible:


Further Benefits



Application Details


Issues and Concerns



This recommendation is in accordance with Measure BE10 of the CMHC manual on Energy and Water Efficiency in Multi-Unit Residential Buildings  and with Section 6.2 Building Envelope of the ASHRAE Standard on Energy Conservation in Existing Buildings.

The CMHC manual on Energy and Water Efficiency in Multi-Unit Residential Buildings can be found online at

ASHRAE Standard ANSI/ASHRAE/IESNA 100-1995 – Energy Conservation in Existing Buildings is an approved standard of the American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., the Illuminating Engineering Society of North America and the American National Standards Institute.



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