Exterior Weatherstripping Replacement: Stopping Drafts at Every Entry Point

Exterior Renovation Services

Failed weatherstripping on exterior doors and windows is one of the most cost-effective fixes for home energy efficiency — most replacements are DIY-accessible and pay back quickly in reduced heating costs.

Weatherstripping creates the air seal between a movable component — a door or window sash — and its fixed frame. When this seal deteriorates, conditioned air escapes and outside air infiltrates, increasing heating and cooling loads continuously. The Canadian Mortgage and Housing Corporation estimates that air leakage through doors, windows, and penetrations accounts for 25 to 40% of heating energy loss in older homes.

Planning Your Project

The four weatherstripping locations on an exterior door are: the threshold seal at the bottom (door sweep), the two vertical side jambs, and the horizontal head jamb at the top. Each uses a different product type and experiences different wear patterns. Bottom sweeps wear fastest from foot traffic; head jamb seals often outlast the door itself.

Door sweeps come in several types: vinyl sweep that mounts to the door face, threshold seal inserts that are compressed by the door closing, and automatic door bottoms that drop a sealing element when the door closes. Automatic door bottoms provide the best seal quality but are higher cost; threshold inserts are the standard residential choice.

Working With D&D Exterior Finishing

Foam tape weatherstripping — the self-adhesive compressible foam strip — is the least durable option and appropriate only for low-traffic windows and secondary doors. In high-traffic door applications, foam tape compresses permanently within 1 to 2 seasons and loses sealing function.

Pile weatherstripping (a brush-like pile of fibres in a channel) is the standard for double-hung window channels. It provides excellent seal with minimal friction on sliding components and outlasts foam tape significantly. For casement and awning windows, compressible bulb seal is the correct type.