Understanding London's Climate Challenges
London, Ontario experiences a humid continental climate with distinct seasons that create unique challenges for masonry structures. From freeze-thaw cycles to humidity fluctuations, our local weather patterns directly impact the longevity of brick and stone homes.
Freeze-Thaw Cycles: The Silent Destroyer
Perhaps the most significant climate challenge for London masonry:
- London averages 65-75 freeze-thaw cycles annually, among the highest in Canada
- Water penetrates tiny cracks in masonry, expands when frozen, and creates larger cracks
- This cycle repeats throughout winter, progressively damaging masonry
- Most visible in early spring when winter damage becomes apparent
- Prevention: Proper tuckpointing, appropriate sealers, and addressing water issues promptly
Humidity and Moisture Management
London's proximity to the Great Lakes influences our humidity levels:
- Summer humidity averages 70-80%, promoting algae and moss growth on masonry
- Moisture can penetrate brick and stone, carrying dissolved salts
- Efflorescence (white powdery deposits) appears as moisture evaporates
- Persistent dampness accelerates mortar deterioration
- Solution: Proper drainage, breathable sealers, and regular maintenance
Seasonal Temperature Fluctuations
Our dramatic seasonal changes affect masonry structures:
- Annual temperature range from -20°C to +35°C causes expansion and contraction
- Different materials (brick, mortar, stone) expand at different rates
- This differential movement creates stress at material interfaces
- Results in cracking, particularly around windows, doors, and corners
- Mitigation: Proper expansion joints and flexible caulking at material transitions
Wind-Driven Rain Penetration
London's weather patterns include significant wind-driven rain:
- Prevailing westerly winds push rain horizontally against west and southwest-facing walls
- These exposures typically show accelerated deterioration
- Wind can force water into even tiny cracks and defects
- Most noticeable during fall and spring storms
- Protection: Proper flashing details, roof overhangs, and maintained mortar joints
Acid Rain and Environmental Factors
Despite improvements, our region still experiences some acid precipitation:
- Industrial emissions from the US Midwest affect our local rainfall pH
- Limestone and marble are particularly vulnerable to acid rain damage
- Accelerates the natural weathering process of calcareous stones
- Creates a "sugaring" effect on limestone surfaces
- Protection: Appropriate sealers and regular cleaning
Climate-Specific Masonry Solutions
At 519 Trough & Exterior, we've developed specialized approaches for London's climate:
- Custom mortar formulations designed for our freeze-thaw conditions
- Breathable water repellents that prevent water infiltration while allowing vapor transmission
- Proper flashing and drainage details for our precipitation patterns
- Seasonal maintenance programs addressing London's specific climate challenges
Contact us for a climate-specific assessment of your London home's masonry needs and a customized maintenance plan to protect your investment.