How Weather Affects Brickwork and What You Can Do About It

1. Freeze-Thaw Cycles

Impact:

Freeze-thaw cycling is the single most damaging weather condition for brick masonry in Michigan, and it operates on a simple mechanism: water enters the porous structure of brick and mortar, temperatures drop below freezing, and that water expands by approximately nine percent as it freezes. The expansion exerts pressure on the surrounding material - pressure that opens micro-cracks, widens existing ones, and eventually causes spalling at the brick face and crumbling at the mortar joint. When temperatures rise, the ice melts, the material absorbs more water, and the cycle repeats. Each cycle leaves the masonry more damaged and more absorbent than the last, which is why freeze-thaw damage accelerates as Michigan winters progress.

Solution:

Inspecting brick walls for water staining, mold growth, and efflorescence after sustained rain periods identifies where moisture infiltration is occurring. Repointing deteriorated mortar joints closes the primary water entry points in the wall surface. A water-resistant breathable sealant reduces moisture absorption at the brick face. Gutters and downspouts maintained to discharge water well away from the wall base reduce the sustained moisture contact that drives the most significant damage.

2. Heavy Rain and Humidity

Impact:

Brick absorbs moisture from sustained rainfall and elevated humidity in ways that don't resolve quickly. Water that enters the wall assembly during a rain event doesn't fully dry before the next one in Michigan's wetter seasons, and the accumulated moisture drives mold and mildew growth at the surface, efflorescence as dissolved salts are carried to the brick face by moving moisture, and progressive erosion of the mortar joints. Over time, sustained moisture exposure compromises both the structural integrity and the appearance of the masonry. For a closer look at the full range of damage moisture causes and how it progresses, our guide on Brick & Mortar Damage Caused by Moisturebrick and mortar damage caused by moisture covers the mechanisms and warning signs in detail.

Solution:

Inspecting brick walls for water staining, mold growth, and efflorescence after sustained rain periods identifies where moisture infiltration is occurring. Repointing deteriorated mortar joints closes the primary water entry points in the wall surface. A water-resistant breathable sealant reduces moisture absorption at the brick face. Gutters and downspouts maintained to discharge water well away from the wall base reduce the sustained moisture contact that drives the most significant damage.

3. Sun Exposure and Heat

Impact:

Southeast Michigan doesn't face the extreme heat conditions of southern climates, but cumulative UV exposure and summer heat cycling still affect brickwork over time. Prolonged sun exposure dries out brick faces and causes gradual color fading - more noticeable on south and west-facing walls that receive the most direct sun. UV radiation breaks down the organic binders in some mortar formulations, contributing to surface hardening and cracking. Heat expansion during warm months followed by contraction during cold ones creates a low-frequency cycling stress on the wall assembly that compounds the effects of freeze-thaw cycling over years.

Solution:

A UV-resistant sealant provides meaningful protection against fading and mortar UV degradation on sun-exposed wall faces. Regular repointing keeps mortar joints performing despite the combined effects of UV exposure and thermal cycling. For walls with significant sun exposure, lighter-colored mortar joints that reflect rather than absorb heat reduce the thermal stress on the adjacent brick.

4. Wind and Storm Damage

Impact:

High winds and severe storms create physical damage mechanisms that freeze-thaw and moisture don't - flying debris that chips and cracks brick faces, wind pressure on exposed wall sections that stresses mortar joints and wall ties, and the concentrated water delivery of driven rain that saturates masonry faster than normal rainfall. Loose bricks and deteriorated mortar joints that might hold up under normal conditions can fail under the combined mechanical and moisture stress of a significant storm event. Michigan's spring and fall storm seasons in particular - with high winds, heavy rain, and temperature swings - are the periods that most often reveal masonry vulnerabilities that have been developing quietly.

Solution:

Post-storm inspection is the most important response measure - checking exposed wall sections for new cracks, chips, displaced bricks, and mortar joint damage after significant weather events catches storm damage while it's still isolated and addressable. Strategic landscaping - trees and shrubs positioned to buffer prevailing winds - reduces the direct exposure of vulnerable wall sections without creating root interference problems if planted at appropriate distances from the foundation.

5. Snow and Ice

Impact:

Snow accumulation against brick walls introduces sustained moisture contact as it melts - a slow, prolonged version of the rain exposure problem that extends the period of moisture infiltration beyond what storm events alone produce. Ice formation in and around brick joints exerts pressure on the mortar bond from within the joint rather than from absorbed water within the brick - a different mechanism that produces similar damage. Deicing products applied near or on masonry accelerate the problem: chloride-based salts drive crystallization within the pore structure of the mortar and brick that contributes to spalling and surface erosion beyond what freeze-thaw cycling alone would cause.

Solution:

Clearing snow accumulation away from wall bases reduces the sustained moisture contact that slow melt introduces. Pre-winter sealant application reduces the moisture absorption that makes both freeze-thaw cycling and ice formation within the joint damaging. Chloride-free deicing products used on adjacent surfaces, and prompt rinsing of any chloride products that contact masonry, limit the salt crystallization damage that compounds freeze-thaw deterioration through Michigan winters.

Preventive Tips to Protect Your Brickwork

Seal your brickwork

A breathable, penetrating sealant formulated specifically for masonry reduces moisture absorption across the brick and mortar surface without trapping existing moisture within the wall. The breathable specification is non-negotiable - film-forming sealants that prevent moisture escape accelerate the internal freeze-thaw damage they're intended to prevent.

Schedule regular inspections

Seasonal inspections - specifically early spring after freeze-thaw season and late fall before winter - are the most productive timing for masonry assessment. Cracks, crumbling mortar, spalling brick faces, and efflorescence staining caught at these points represent the season's accumulated damage at its most recent and most addressable stage.

Repoint mortar as needed

Mortar deteriorates faster than brick and requires periodic replacement as part of the normal masonry maintenance cycle. Repointing at the right time - when joints have eroded but the surrounding brick is still sound - is the single most effective maintenance action available for protecting a brick wall's long-term structural and waterproofing performance.

Ensure proper drainage

Gutters, downspouts, and site grading that direct water away from the wall base eliminate the sustained moisture contact that is the primary driver of mortar erosion, freeze-thaw damage, and efflorescence. The investment in maintaining functional drainage pays off consistently in reduced masonry repair scope.

Use landscaping for protection

Vegetation positioned to buffer prevailing winds and reduce direct sun exposure on vulnerable wall faces reduces the weather stress those walls accumulate over time. Root interference is a real consideration - maintain appropriate planting distances from the foundation, and avoid species with aggressive root systems near masonry structures.

Apply UV-resistant and water-repellent coatings

UV-resistant coatings protect brick and mortar color and surface integrity on sun-exposed walls. Water-repellent coatings reduce the moisture absorption that drives most weather-related masonry damage. Both should be breathable products - the ability to release internally trapped moisture is as important as the ability to resist new moisture entry.

Final Thoughts

Weather exposure is the constant against which every brick masonry structure is measured - and southeast Michigan's climate is a particularly demanding one. Freeze-thaw cycling, sustained moisture exposure, wind, and seasonal temperature swings all work on brickwork continuously, and the masonry that holds up well over decades is the masonry that receives consistent attention.

Proactive maintenance - sealing, timely repointing, drainage management, and regular inspection - is what keeps weather-related deterioration from compounding into structural damage. But when deterioration has already progressed, professional assessment and repair are what stop it from continuing. Our Professional Brick Repair and Restoration Servicesprofessional brick repair and restoration services cover the full range of weather-related damage diagnosis and repair - from spalling and mortar erosion to moisture infiltration and structural assessment.

If you're concerned about the condition of your brickwork after a difficult season, Contact Bethel Custom BrickContact Bethel Custom Brick today to schedule an expert evaluation and find out what proactive care or repair your masonry needs.