Home Insulation · Canada

Keeping heat inside the house, one assembly at a time.

Winters in much of Canada run long and cold, and a large share of a home's heating energy escapes through under-insulated attics, walls, and gaps around doors and windows. This reference explains how insulation works, where heat is lost, and which sealing measures address each path.

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Mineral wool batts installed between wood-framed wall studs — Batt insulation fitted between wall studs. Source: Wikimedia Commons (CC).

Reference topics

Three areas that decide a home's heat loss

Each topic below covers one of the paths heat takes out of a house, with material comparisons and practical detail rather than general statements.

Rigid insulation boards being applied to an exterior wall

Insulation Types Compared

How batts, blown cellulose, mineral wool, and rigid foam differ in R-value, moisture behaviour, and where each fits in a Canadian assembly.

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Rolls of loft insulation stacked for sale

Attic & Roof Heat Loss

Why the attic is usually the first place to add insulation, how to reach recommended depths, and the role of air sealing before topping up.

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Insulating material packed around a window opening

Draft Sealing

Where air leaks concentrate in older homes, how weatherstripping and caulking address them, and how to find leaks without specialist tools.

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How heat leaves a home

Conduction, air leakage, and radiation

Conduction through assemblies

Heat moves through solid materials from warm to cold. Insulation slows this by trapping still air or gas in a low-conductivity matrix, which is why R-value matters across walls, floors, and ceilings.

Air leakage

Warm indoor air escapes through gaps at the top of the house while cold air is drawn in lower down. Sealing these openings often improves comfort more directly than adding insulation alone.

Radiation and windows

Glazing loses heat by conduction and radiation. Reducing drafts around frames and using appropriate coverings helps, though the glass itself is governed by its construction.

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