Water is one of the biggest long-term threats to masonry, foundations and other exterior structures around a home.
Brick, stone, concrete and mortar are designed to withstand weather, but they are not immune to continuous moisture exposure. When rainwater repeatedly collects around a foundation, behind a retaining wall or underneath a patio, small problems can gradually become expensive repairs.
Cracked mortar, loose bricks, settling walkways, leaning retaining walls and basement moisture may appear to be unrelated problems. In many cases, however, they share the same underlying cause: poor drainage.
Understanding how water moves around a property can help homeowners identify problems earlier and protect masonry structures before serious deterioration occurs.
Why Drainage Is So Important Around a Home
Every property needs a way to safely move rainwater away from buildings and outdoor structures.
During a storm, water may come from several sources:
- Roof runoff
- Gutters and downspouts
- Driveways
- Patios
- Walkways
- Sloped landscaping
- Neighboring properties
- Groundwater
- Snowmelt
If that water drains away properly, it generally creates fewer problems.
If it collects beside a house or becomes trapped behind masonry structures, however, the surrounding soil can remain saturated for extended periods.
This moisture can contribute to deterioration both above and below ground.
1. Water Can Weaken Mortar Joints
Mortar holds masonry units such as brick, block and stone together.
Although properly installed mortar can last for decades, repeated exposure to moisture and seasonal weather eventually causes deterioration.
Signs may include:
- Crumbling joints
- Missing mortar
- Surface erosion
- Gaps between bricks
- Loose stones
- Water staining
- Efflorescence
Once mortar joints deteriorate, additional water can penetrate deeper into the wall.
That creates a cycle in which water contributes to mortar deterioration, deteriorated mortar allows more water inside, and the additional moisture accelerates further damage.
Professional masonry and hardscape repair services can address damaged mortar, brick, stone and concrete, but correcting the source of excessive moisture is equally important if drainage caused the deterioration.
Otherwise, repaired masonry may eventually experience the same problem again.
2. Freeze-Thaw Cycles Make Water Damage Worse
Drainage problems can become particularly damaging in areas that experience cold winters.
Brick, concrete, mortar and stone can absorb varying amounts of moisture.
When temperatures fall below freezing, water within small cracks and pores can freeze and expand. When temperatures rise, the ice melts.
Repeated freezing and thawing can gradually enlarge cracks and weaken masonry surfaces.
This may contribute to:
- Spalling brick
- Cracked concrete
- Loose mortar
- Flaking masonry surfaces
- Broken steps
- Crumbling retaining walls
A masonry structure that remains relatively dry generally experiences less water-related freeze-thaw stress than one that is constantly saturated.
This is one reason good drainage is an important part of long-term masonry maintenance.
3. Poor Drainage Can Contribute to Foundation Problems
Foundations interact directly with the soil surrounding a building.
When that soil becomes saturated, water pressure around the foundation can increase.
This can contribute to moisture entering through:
- Foundation cracks
- Mortar joints
- Concrete pores
- Wall-floor connections
- Basement windows
- Pipe penetrations
- Open masonry joints
Water can also contribute to deterioration in older brick, block and stone foundations.
A foundation problem should therefore be evaluated in context.
Repairing a visible crack may be appropriate, but homeowners should also consider why the crack developed and whether drainage, settlement or soil pressure played a role.
If foundation cracks are accompanied by recurring moisture or deteriorating masonry, professional foundation repair and waterproofing may involve both repairing the wall and improving conditions around it.
4. Standing Water Around the Foundation Is a Warning Sign
One of the easiest drainage problems for homeowners to identify is standing water.
After significant rain, walk around the property and look for puddles near the foundation.
Water should not repeatedly remain beside basement walls for extended periods.
Common causes include:
- Low areas beside the house
- Settled soil
- Incorrect grading
- Downspouts discharging too close to the foundation
- Poorly pitched patios
- Driveways directing runoff toward the house
- Blocked drainage systems
Standing water does not automatically mean foundation damage has occurred.
However, it indicates that the drainage system around the property deserves attention.
Reducing the amount of water collecting beside the structure can help lower moisture pressure against foundation walls.
5. Retaining Walls Are Especially Sensitive to Drainage
Retaining walls have one primary job: holding back soil.
However, they may also have to deal with large quantities of water.
When rainfall enters the soil behind a retaining wall, that water increases the weight and pressure pushing against the structure.
A properly constructed wall generally incorporates drainage features that allow water to escape.
These may include:
- Drainage stone
- Perforated pipe
- Filter fabric
- Weep holes
- Proper grading
- Suitable outlets
Without adequate drainage, pressure may gradually cause a retaining wall to:
- Lean
- Bulge
- Crack
- Separate
- Lose mortar
- Shift at the base
Simply repairing cracks in a retaining wall without addressing trapped water may provide only a temporary solution.
Drainage should therefore be evaluated whenever significant retaining-wall movement occurs.
6. Water Can Wash Away the Base Beneath Patios and Walkways
Patios and walkways rely on stable material underneath them.
Whether the surface consists of pavers, stone or concrete, the supporting base needs to remain relatively stable.
Poor drainage can cause water to move through or beneath that base.
Over time, fine material may wash away.
The surface above can then begin to:
- Settle
- Sink
- Crack
- Separate
- Become uneven
- Hold water
A sunken walkway is therefore not always simply the result of age.
Water movement beneath the surface may be contributing to the problem.
If the walkway is reset without correcting significant drainage issues, settlement can return.
7. Driveways Can Direct Large Amounts of Water Toward a Home
Driveways cover a relatively large surface area.
Because rain cannot easily soak through solid asphalt or concrete, much of that water runs across the surface.
The slope of the driveway determines where it goes.
Ideally, runoff should be directed toward an appropriate drainage location.
Problems develop when a driveway pitches toward:
- A garage
- Basement entrances
- Foundation walls
- Steps
- Retaining walls
- Low sections of the yard
Even a relatively small slope can move a surprising amount of water during heavy rainfall.
Homeowners experiencing moisture problems should therefore consider surrounding hardscapes as part of the drainage investigation.
8. Roof Drainage Can Affect Masonry at Ground Level
The roof may appear unrelated to foundation and masonry damage, but all of these systems are connected.
Rain falls onto the roof and enters the gutters.
The gutters move water toward the downspouts.
The downspouts then determine where the water reaches the ground.
If a downspout terminates directly beside the foundation, a large portion of the roof runoff may repeatedly saturate one small area.
This can contribute to:
- Foundation moisture
- Soil erosion
- Basement leaks
- Mortar deterioration
- Hardscape settlement
Gutter and downspout maintenance is therefore an important part of protecting masonry around the lower portion of a home.
9. French Drains Can Help Control Certain Drainage Problems
When water consistently accumulates in particular areas, additional drainage systems may be needed.
French drains are commonly used to collect and redirect water.
An exterior French drain can help manage water around:
- Foundations
- Retaining walls
- Patios
- Walkways
- Sloped yards
- Low landscape areas
Interior systems may be used when groundwater or foundation seepage reaches a basement.
Homeowners dealing with recurring water problems can learn more about interior and exterior French drain systems and how each approach handles water differently.
A French drain should not simply be installed wherever water appears.
Effective drainage design requires considering:
- Ground slope
- Soil conditions
- Water source
- Drain depth
- Pipe slope
- Available discharge points
- Nearby structures
The objective is not merely to collect water but to move it somewhere appropriate.
10. Efflorescence Can Reveal Hidden Moisture
White powdery deposits occasionally appear on brick, block and concrete.
This is known as efflorescence.
Moisture moving through masonry can dissolve naturally occurring salts. When the water reaches the surface and evaporates, those salts remain behind.
Efflorescence itself is not usually structural damage.
However, it can be evidence that moisture is traveling through the masonry.
If it repeatedly returns after cleaning, homeowners should investigate where that moisture is coming from.
Possible sources include:
- Exterior drainage
- Groundwater
- Leaking gutters
- Damaged masonry joints
- Failed flashing
- Foundation moisture
Finding and controlling the water source is often more important than repeatedly cleaning the visible deposits.
11. Soil Erosion Can Undermine Masonry Structures
Water moving too quickly across a property can also remove soil.
This is known as erosion.
Homeowners may notice:
- Channels forming in landscaping
- Soil disappearing beside walkways
- Exposed foundations
- Gaps beneath concrete
- Washed-out areas near retaining walls
- Loose pavers
Over time, erosion may remove some of the support surrounding or beneath masonry structures.
Correcting the drainage route can help prevent continued loss of material.
12. Grading Plays a Major Role in Water Management
Grading refers to the way the ground slopes.
In many situations, the land immediately surrounding a house should encourage water to travel away from the foundation rather than toward it.
Unfortunately, grading can change over time.
Soil settles.
Landscaping is altered.
Patios and walkways move.
New construction changes runoff patterns.
As a result, an area that drained properly years ago may eventually begin directing water toward the house.
Homeowners should periodically check how water moves around their property, particularly after major landscaping or hardscape work.
Warning Signs That Drainage May Be Damaging Masonry
Some drainage problems are obvious, while others develop gradually.
Watch for combinations of the following symptoms:
- Crumbling mortar
- Repeated masonry cracks
- White staining on basement walls
- Damp basement areas
- Standing water outside
- Sinking patios
- Uneven walkways
- Leaning retaining walls
- Soil erosion
- Water collecting near steps
- Foundation cracks
- Loose bricks or stones
- Basement leaks after rain
A single symptom may have several possible causes.
Several appearing together make drainage problems more likely to deserve investigation.
Why Surface Repairs Sometimes Fail
Imagine a cracked section of mortar caused by repeated saturation.
A contractor replaces the damaged mortar.
Visually, the wall looks repaired.
But the downspout above continues releasing roof water directly beside that wall.
The masonry becomes saturated again.
A few winters later, deterioration begins returning.
The mortar repair itself may have been completed correctly. The problem was that only the visible symptom was addressed.
This example illustrates an important principle:
Successful exterior repairs often require fixing both the damage and the condition that caused it.
Drainage, Foundations and Masonry Should Be Evaluated Together
Homes are made up of interconnected systems.
Foundation walls support masonry.
Retaining walls manage changes in elevation.
Patios and driveways affect surface runoff.
Gutters control roof water.
French drains manage groundwater or surface drainage.
When one part of that system fails, problems can appear somewhere else.
This is why contractors familiar with multiple exterior systems can sometimes identify connections that are easy to overlook when each problem is considered separately.
For homeowners in New York and New Jersey, Optane Masonry and Home Improvements works across masonry, hardscaping, foundations, waterproofing and drainage, allowing these related property conditions to be assessed together.
How Homeowners Can Reduce Water-Related Damage
Some basic preventative measures can make a significant difference.
Homeowners should periodically:
- Clean gutters and confirm they drain properly.
- Extend downspouts away from foundation walls where appropriate.
- Watch the property during heavy rainfall.
- Correct obvious areas of standing water.
- Inspect mortar joints for deterioration.
- Check retaining walls for leaning or cracking.
- Watch for settlement around patios and walkways.
- Maintain drainage outlets.
- Investigate recurring basement moisture.
- Repair masonry damage before water penetration becomes more extensive.
Preventative maintenance is generally easier than repairing large sections of deteriorated masonry later.
Final Thoughts
Poor drainage often causes damage slowly.
One storm rarely destroys a foundation or retaining wall. Instead, water repeatedly reaches the same vulnerable areas over months and years.
Mortar begins deteriorating.
Soil washes away.
A patio starts settling.
A foundation becomes damp.
A retaining wall develops a slight lean.
Eventually, homeowners see several seemingly separate problems when they may all originate from the way water moves around the property.
For this reason, drainage should be considered whenever recurring masonry or foundation damage appears.
Correcting the source of excessive water, alongside repairing damaged materials, provides a much stronger long-term approach than simply covering cracks and waiting for them to return.
