Finding materials that match the original construction of a pre-1940 Canadian building requires a different sourcing approach than a standard renovation. Modern brick runs smaller than pre-metric units. Contemporary Portland cement mortars are harder and less permeable than the natural hydraulic and lime mortars used in heritage construction, and applying them to soft heritage brick accelerates spalling. Millwork profiles, window sash dimensions, and flooring species vary significantly by construction era and regional market.
The following covers the main material categories, what to look for, and where Canadian suppliers and salvage operations typically source comparable stock.
Masonry: brick and stone
Pre-metric Canadian brick — laid before the 1970s adoption of metric sizing — typically measures approximately 2¼" × 3¾" × 8" (57 × 95 × 203 mm), compared to the current standard of 57 × 90 × 190 mm. The difference is small but visible in a repaired section. When replacing individual units in an existing wall, a close match on bed depth and stretcher face width matters most for the finished joint pattern.
Reclaimed brick is the most reliable source of pre-metric units. Several Ontario-based salvage operations — including suppliers in the Hamilton, Guelph, and Kingston corridors — carry stock recovered from demolished industrial and commercial buildings. Colour matching is the main difficulty; firing temperatures and clay sources varied by decade and by region, producing a range of buff, red, orange, and mottled faces that modern brick cannot replicate.
For rubble stone and ashlar, Ontario and Quebec have active limestone and sandstone quarrying regions. Some operations in the Kingston and Queenston areas still produce limestone in dimensions compatible with historic coursing. Heritage BC maintains a directory of stone yards serving the west coast market.
Testing for compatibility
Before committing to a brick or stone lot, request sample units and have them tested for compressive strength and absorption. Heritage masonry typically tests in the 7–20 MPa range. Replacement units significantly harder than the surrounding wall will transfer load unevenly and can cause cracking over time. The Parks Canada Standards and Guidelines recommend that replacement units match original units in strength, absorption, and thermal expansion coefficient within 20%.
Mortar: the most consequential material decision
Mortar is the sacrificial element in a masonry wall. It is designed to be softer than the masonry units, so that movement and moisture cycling cause cracking in joints — which can be repointed — rather than in brick faces, which cannot be repaired invisibly. Pre-1920 Canadian construction used predominantly natural hydraulic lime or hot lime mortars. Buildings from the 1920s through the 1950s often transitioned to Type N or Type O Portland-lime blends. Fully Portland mortars became standard after the Second World War.
Applying Type S or Type M Portland mortars to a soft heritage brick wall is the single most common cause of accelerated deterioration in Canadian restoration projects. The harder mortar traps moisture behind it, and freeze-thaw cycles in Canadian winters exploit the differential expansion rates, delaminating brick faces over one to three decades.
Identifying existing mortar composition
A laboratory analysis of a mortar sample — typically costing $200–$400 at a materials testing laboratory — identifies the binder type, aggregate composition, and approximate mix proportions. This information directly informs the specification for repointing mortar. The National Research Council of Canada has published guidance on mortar analysis and matching; the document is available through the NRC construction research portal.
Sourcing lime mortar in Canada
Natural hydraulic lime (NHL) products are available through specialty masonry suppliers in most Canadian urban centres. European producers — Saint-Astier and Prompt Natural Cement in France, Otterbein in Germany — supply the Canadian market through regional distributors. Domestic production is limited; Lafarge's Exshaw, Alberta plant produces high calcium lime, but NHL products with specific hydraulicity ratings continue to rely primarily on import. Lead times of three to six weeks are normal; ordering well ahead of the repointing season is advisable.
Windows and millwork
Heritage window rehabilitation is generally preferable to replacement from both a conservation and energy-performance standpoint. A single-glazed double-hung window with an added interior or exterior storm panel can achieve thermal performance within 15–20% of a modern double-pane unit while preserving original glass, sash profiles, and hardware. The Preservation Brief series published by the US National Park Service, widely referenced by Canadian conservation practitioners, documents the case for rehabilitation in detail.
When original windows must be replaced — due to structural failure or fire damage — matching profiles require custom millwork. Several shops in Ontario and Quebec fabricate heritage sash profiles in old-growth pine, Douglas fir, or white oak on request. Turnaround times range from eight to sixteen weeks depending on complexity. For standard 2-over-2 or 6-over-6 double-hung patterns, off-the-shelf heritage-profile windows from suppliers such as Marvin or Windsor are available through Canadian distributors.
Original glass
Wavy or rolled glass from the pre-1950 period has visual character that distinguishes a rehabilitated window from a replacement. Salvaged glass can be reused when its dimensions match the replacement sash, and some specialty glaziers offer antique restoration glass in sheets compatible with heritage sash dimensions. The Ontario Antique Glass Association maintains a referral list.
Interior millwork and hardware
Period baseboards, door casings, wainscot profiles, and stair components are routinely salvaged from buildings undergoing demolition. Architectural salvage dealers in Toronto, Ottawa, Montreal, and Vancouver carry inventories of cast-iron hardware, brass plumbing fittings, and profile-moulded trim. Prices vary widely; well-matched Victorian-era casings in reasonable condition are typically $4–$12 per linear foot from established dealers.
For millwork that must be fabricated, a router table with profile cutters or a shaper with custom knives can reproduce most Victorian-era profiles from measured drawings. Period architectural pattern books — several of which have been digitized by the City of Toronto Heritage Planning team and other municipal archives — provide usable profile drawings for common Ontario construction types.
Roofing
Historic Canadian roofs covered in wood shingle, slate, clay tile, and various forms of standing-seam and flat-seam metal each require different replacement approaches. For slate, the main variable is source region: Welsh blue-grey, Vermont green-purple, and domestic Newfoundland slates have different weathering profiles and lifespans. Matching the original requires identifying both colour and texture, and confirming that the replacement slate carries an equivalent or better hardness rating. Vermont Structural Slate and similar North American quarries supply the Canadian market; some Quebec contractors maintain stocks of reclaimed Ontario and Quebec slate.
Standing-seam terne or painted steel roofs on pre-1940 commercial heritage buildings are sometimes replaced with zinc-alloy standing seam as a durable, compatible alternative. Copper remains the period-appropriate choice for civic and institutional buildings. Material specifications should be confirmed against the heritage permit requirements, as some designation by-laws specify roofing material type.