Visible indicators documented during inspection (stair-step cracks, rusted lintels, bulging walls, eroded mortar joints, spalled bricks, weep holes), visual-inspection limitations regarding structural stability, and when a qualified mason or structural engineer is required. Particularly relevant for Montreal's older urban housing stock. Educational page — not a structural certification or legal advice.
Brick masonry on wood structure is the signature of Montreal's pre-1950 plexes — Plateau, Rosemont, Villeray, Verdun, Le Sud-Ouest, NDG, Westmount, Hochelaga, Ville-Marie. It is also characteristic of older commercial buildings, Sherbrooke Victorian homes, and Trois-Rivières heritage stock. This masonry has been subjected for decades to freeze-thaw cycles, thermal expansion, building movement, mortar erosion, and corrosion of metal elements (steel lintels, ties). Above openings (windows and doors), a lintel — usually a steel beam in early-20th-century buildings — supports the masonry. When the lintel corrodes and swells, it pushes the masonry above and produces characteristic cracks. During a visual inspection, we document visible indicators that may orient toward specialist verification — without making a conclusive structural diagnosis.
Here are the visible indicators we systematically document during an inspection. The severity classification is educational — each case must be evaluated in its context by an inspector, then by a mason or structural engineer when signs warrant it.
Cracks following mortar joints in a stair-step pattern in masonry. Fine stable cracks are common and of low concern. Wide, evolving cracks or cracks in multiple converging zones may indicate structural movement and warrant verification.
Visible lintel above a window or door showing marked corrosion (swelling rust) and sagging. Corrosion expands the steel (up to 8× its original thickness), pushing the masonry above and causing cracks and displacement.
Stone or sill element (below a window) cracked, split, displaced or tilted. May indicate localized movement, underlying infiltration, or original defect. To document and monitor for evolution.
Original mortar eroded, missing, or recently repointed with incompatible Portland-cement mortar (older bricks are softer). Incompatible mortar can accelerate brick spalling.
Vertical or horizontal bulging of a masonry wall section, measurable horizontal displacement at the level, broken alignment of brick rows. Possible indicators of wall-tie failure or structural movement — structural engineering evaluation recommended.
Bricks fragmented by freeze-thaw, friable surface, masonry flashings missing or deteriorated, blocked or non-existent weep holes at the wall base. Signs of trapped water in masonry — to correct to prevent worsening.
Important: these visible indicators document conditions observed at the time of inspection. A visual inspection does not confirm structural stability or the condition of hidden wall ties. Many cracks do not indicate structural movement and result from normal thermal stress or mortar shrinkage. Detailed evaluation is the responsibility of a qualified mason and, when relevant, a structural engineer.
Our visual inspection follows the InterNACHI standard. For masonry and lintels, the limitations are significant — particularly because many critical elements are hidden.
Our report documents indicators and recommends, on a case-by-case basis, the intervention of a qualified mason, a structural engineer, or both depending on the nature of the observations.
Masonry issues are concentrated in the older urban housing stock. Regions dominated by recent single-family suburbs (post-1980 with vinyl or aluminum siding) are less concerned by the specific issues covered here.
The other regions we serve (South Shore, North Shore, West Island, Laurentides, Lanaudière) contain fewer buildings with full traditional masonry façades — issues there mainly concern isolated commercial or heritage buildings. Case-by-case verification if relevant.
If the pre-purchase inspection reveals concerning visible masonry indicators and the condition-removal deadline is short, several options are available depending on your risk tolerance and the seller's cooperation.
What is documented during an inspection, what is not, and when to consult a mason or engineer.
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