Brick and stone have sheltered homes for centuries — and for good reason. But even the most durable materials need regular attention. A little knowledge and seasonal diligence can add decades to your exterior and save you thousands in repairs.
Why Maintenance Matters More Than You Think
Many homeowners assume that because brick and stone look solid, they’re essentially maintenance-free. It’s an understandable mistake — and one that leads to surprisingly costly surprises. The real vulnerabilities in masonry exteriors are almost never the brick or stone itself, but the mortar, the sealants, the drainage details, and the way water moves (or doesn’t move) across the surface.
Water is masonry’s primary enemy. When moisture infiltrates cracks, freezes, and expands, it breaks mortar joints, spalls brick faces, and can even shift the structural integrity of a wall over time. Regular inspections and prompt repairs stop these problems before they compound.
The 10-Year Rule– Most masonry professionals recommend a thorough inspection and any necessary repointing every 10–25 years, depending on climate and exposure. In freeze-thaw climates like the Midwest and Northeast, aim for the shorter end of that range.
Seasonal Maintenance Schedule
The best approach to masonry care is a simple seasonal rhythm. Most tasks take only an hour or two and require no special tools.
🌿 Spring
- Inspect for winter frost damage
- Check mortar joints for cracks
- Clean off moss, algae, or staining
- Clear weep holes and drainage gaps
- Inspect and re-caulk window/door surrounds
☀️ Summer
- Apply sealant if needed (low humidity)
- Patch or repoint minor mortar gaps
- Power wash if heavily soiled
- Trim vegetation away from walls
🍂 Fall
- Final inspection before freeze season
- Ensure gutters divert water away from walls
- Clear debris from base of walls
- Complete any repointing before frost
❄️ Winter
- Avoid de-icing salts near masonry
- Monitor for ice dams above brick
- Note any new cracking for spring repair
- Keep drainage paths clear of ice buildup
Inspecting Your Mortar Joints
Mortar is the unsung hero of any masonry wall. It seals out moisture, distributes structural loads, and accommodates the slight movements all buildings experience over time. As mortar ages, it becomes brittle and begins to recede from the brick face — a process called spalling.
Walk the perimeter of your home every spring and look closely at the joints between bricks or stones. Healthy mortar should sit flush with or slightly recessed behind the masonry face. Warning signs include:
- Crumbling, soft, or sandy mortar that you can scrape out with a key
- Gaps or voids where mortar has fallen out entirely
- Stair-step cracking following the mortar joints (may signal settling)
- Horizontal cracks along a single course of brick (serious — call a pro)
- White powdery deposits on the surface (efflorescence — a sign of moisture movement)
When to DIY, When to Call a Pro
Repointing — the process of removing deteriorated mortar and replacing it — is a satisfying DIY project for small areas. You’ll need a cold chisel, angle grinder, and premixed mortar matched to your existing joints. For anything involving cracks wider than ¼ inch, stair-step patterns, or horizontal fractures, hire a licensed mason. These can indicate structural movement that needs professional diagnosis.
“The mortar joint is the weakest point and the most important one. Get the mortar right, and everything else takes care of itself.”
Cleaning Brick and Stone Surfaces
Dirt, pollution, moss, and biological growth are inevitable on any exterior surface. The good news is that most masonry cleans up beautifully with the right approach — and the wrong approach can cause more harm than doing nothing.
General Cleaning
For routine grime and light staining, a stiff natural-bristle brush and warm water is your best starting point. Work from the top down to avoid re-soiling areas you’ve already cleaned. For more stubborn buildup, a diluted solution of dish soap or a masonry-specific cleaner works well on most brick.
Pressure Washing
A pressure washer can dramatically speed up cleaning — but use it with care. Keep the pressure below 1,500 PSI for brick, hold the wand at least 12 inches from the surface, and never use a zero-degree nozzle. High pressure can erode mortar joints and drive water deep into the wall assembly.
⚠ Avoid These Cleaning Mistakes
Never use muriatic acid on colored or glazed brick without professional guidance — it can permanently alter the surface. Avoid wire brushes on soft historic brick; they’ll scratch the face. And never use bleach-based cleaners near limestone or marble-containing stone, as they can cause irreversible etching.
Tackling Efflorescence
That white, chalky haze you sometimes see on brick is efflorescence — mineral salts carried to the surface by water movement. It’s usually harmless and often disappears on its own, but persistent efflorescence signals an ongoing moisture problem worth investigating. Dry-brushing removes most of it; specialty efflorescence cleaners handle the stubborn cases.
Sealing and Waterproofing
This is where homeowners face the most conflicting advice. The masonry industry is divided on sealing, and for good reason: a quality breathable sealant applied correctly can reduce moisture infiltration significantly, while the wrong product can trap moisture inside the wall and dramatically worsen damage.
✦ Professional Insight
The key word is “breathable.” Always choose a penetrating silane or siloxane-based water repellent — never a film-forming sealer that coats the surface. Film sealers trap vapor and can cause the brick face to spall away. Look for products labeled “vapor permeable” or specifically formulated for masonry.
Sealing is most beneficial in two situations: on porous brick in climates with significant freeze-thaw cycles, and on stone types like limestone or sandstone that absorb water readily. Dense granite or hard-fired modern brick rarely needs sealing. When in doubt, have a masonry professional assess your specific situation before applying any product.
Stone-Specific Considerations
Natural stone exteriors share many maintenance needs with brick, but differ in a few important ways.
Limestone and Sandstone
These softer sedimentary stones are the most porous and most vulnerable to acid rain, pollution, and moisture. They benefit the most from a high-quality breathable sealant applied every 3–5 years. Avoid any acidic cleaners — even diluted vinegar — as they will etch the surface.
Granite and Quartzite
Dense, hard, and highly resistant, these stones require minimal intervention. Occasional cleaning and inspecting the mortar or setting material is generally all that’s needed. Watch the joints and flashing details rather than the stone itself.
Fieldstone and Rubble Masonry
Older homes built with fieldstone often used lime-based mortars, not the modern Portland cement mortars commonly used today. This distinction is critical: repointing historic lime-mortar walls with Portland cement is one of the most common — and damaging — mistakes in masonry restoration. Portland cement is too rigid and will force cracking into the softer stone rather than the joint. Always match the mortar type to the original.
Vegetation and Your Walls
Few things look more charming than ivy climbing an old stone wall — and few things cause more gradual damage. The rootlets of clinging vines like English ivy and Virginia creeper work their way into mortar joints and microscopic cracks, expanding as they grow. When removed, they often take chunks of mortar or even brick face with them.
If you love the look of climbing plants, consider a trellis system that keeps the vines a few inches off the wall, allowing air circulation and preventing direct attachment. Keep any plantings trimmed well below the roofline, and inspect the wall beneath them closely each spring.
The Gutter Connection– A significant number of masonry problems trace back to poorly functioning gutters and downspouts. Water overflowing from clogged gutters saturates the wall below, and downspouts discharging too close to the foundation drive moisture into the base of the wall. Keep gutters clean and extend downspouts at least four feet from the foundation — it’s among the highest-return investments in masonry longevity.
When to Bring in a Professional
A skilled mason’s eye is invaluable for anything beyond routine cleaning and cosmetic repointing. Bring in a professional when you notice:
- Any cracking that appears to be progressing or that follows structural lines
- Bulging or bowing sections of wall
- Water infiltration inside the home that correlates with rain
- Deteriorated flashing at chimneys, windows, or roof intersections
- Historic or unusual masonry you’re uncertain how to treat
- Widespread mortar failure affecting more than a few square feet
Get at least two quotes from masons who specialize in restoration rather than new construction — the skill sets are different, and the details matter enormously with older masonry.
The Long View
A well-maintained brick or stone exterior is one of the most enduring things about a home. These materials have proven themselves over centuries — some of the oldest brick buildings in North America are still standing and perfectly sound. What keeps them that way isn’t magic; it’s attentive owners who catch small problems before they become large ones, keep water moving away from the wall, and treat the masonry with respect.
Add a spring walkthrough to your annual routine, take photos to track changes year over year, and address mortar failures promptly. Do that, and your masonry exterior will likely outlast everything else about the house.