Common bricklayer problems and how to spot them early (2026)
Quick Answer
Common bricklaying problems usually show up early as stepped cracks, bulging or leaning walls, crumbling mortar, damp patches, white salt deposits, or bricks that sound loose when tapped. The key is to separate cosmetic issues from structural ones: small local mortar defects may be repairable, but movement, bulging, widespread cracking or persistent damp need prompt professional assessment.
Overview
Brickwork often gives warning signs before a serious failure develops, but they are easy to miss if you only look at the wall straight on. Early checks should focus on movement, moisture and mortar condition, because these are the main routes by which minor defects turn into expensive repairs. Typical trouble spots include around windows and doors, at the top of garden walls, near ground level, around rooflines, and anywhere rain regularly hits the wall. Look for cracks that follow mortar joints, bricks that are out of line, joints that are recessed or powdery, and staining that suggests trapped moisture. Not every defect means the bricklayer did poor work. Some problems come from building movement, frost damage, sulphate attack, blocked drainage, failed flashings, unsuitable mortar, or later alterations. What matters is pattern and progression. A hairline crack that does not change may be less urgent than a bulge, a crack that widens, or mortar that can be scraped out by hand. If you catch defects early, repointing, drainage improvements or local repairs may be enough. If you leave them, moisture can get deeper into the wall, freeze-thaw damage can worsen, and structural stability can be affected.
Who this is for
Homeowners, landlords and property managers who want to spot brickwork problems early and know when simple monitoring is enough and when to call a qualified bricklayer, builder or structural professional.
What you’ll need
- torch
- camera or phone for dated photos
- notebook or notes app
- straight edge or spirit level
- binoculars for high areas
- dry screwdriver or pointing key for very light surface checks
- safe access from ground level only unless properly equipped
Before you start
Check whether the wall is loadbearing, retaining soil, part of a chimney, near a boundary, or showing signs of active movement such as new cracking, leaning or fallen fragments. Do not climb ladders or remove bricks to inspect. If there is any risk of collapse, cordon the area off and get professional help.
Step-by-step
- 1
Scan the whole wall for movement
Stand back and sight along the wall from both ends if possible. Check whether the brickwork bows outward, leans, twists, or looks uneven around openings such as doors and windows. Compare courses of bricks to see if they still run level and straight.
Why: Movement is one of the clearest signs of a serious problem. Bulging or leaning can point to failed ties, foundation movement, overload, or water-related deterioration.
- 2
Inspect cracks closely
Look at any cracks to see where they run. Note whether they follow mortar joints in a stepped pattern, pass through bricks, or radiate from corners of openings. Take clear dated photos and monitor whether the crack appears to lengthen or widen over time.
Why: Crack pattern helps indicate the likely cause. Stepped cracks often relate to movement in masonry, while cracks concentrated around openings may point to local stress or support issues.
- 3
Check mortar condition
Examine mortar joints at low level and in exposed areas. Look for joints that are missing, deeply recessed, cracked, soft, sandy, or crumbling. Gently rub the surface or lightly probe a loose area without digging into sound mortar.
Why: Mortar is the first line of defence against water ingress and helps distribute loads. Failing joints let in moisture and can allow bricks to loosen.
- 4
Look for damp-related warning signs
Check for white powdery deposits on the brick face, dark damp patches, algae, spalling brick faces, internal staining on the corresponding inside wall, and deterioration near gutters, downpipes and ground level. Also look for blocked air bricks or raised ground levels against the wall.
Why: Moisture is a major driver of brickwork damage. It can lead to salt deposits, frost damage, decay of embedded metalwork, and failure of finishes inside the building.
- 5
Test for loose or hollow areas carefully
From ground level, gently tap suspect bricks and joints with a knuckle or the handle of a tool. Listen for obvious differences and watch for movement. Do not strike hard or disturb unstable masonry.
Why: Loose bricks or detached areas can indicate failing mortar, hidden voids, or loss of bond, all of which can worsen quickly if ignored.
- 6
Check likely water entry points
Inspect the condition of copings, cappings, sills, flashings, sealant junctions, weep holes, gutters and downpipes. Check whether water is being directed onto the wall or trapped within it.
Why: Brickwork problems are often caused or accelerated by defective water management rather than the bricks alone.
- 7
Record, compare and decide urgency
Log what you found, where it is, and whether it changes after heavy rain or over time. Compare one elevation with another and note any worsening. If defects are isolated and superficial, plan maintenance. If there is movement, widespread decay, or safety risk, arrange a professional inspection promptly.
Why: A simple record helps distinguish an old stable defect from an active problem and gives a tradesperson useful evidence.
Why this works
Early brickwork diagnosis works because most serious masonry failures start with visible clues: movement changes alignment, moisture changes colour and surface condition, and mortar failure shows up before bricks fully loosen. Systematic checking helps you catch the cause, not just the symptom.
Common mistakes to avoid
- Assuming all cracks are cosmetic without checking whether they are changing
- Repointing over damp or moving masonry without fixing the underlying cause
- Using very hard cement-rich mortar on older brickwork that needs a more compatible mortar
- Ignoring gutters, flashings or ground levels and blaming the bricks alone
- Painting or sealing over damp brickwork, which can trap moisture
- Patching only the visible face when bricks or joints are loose deeper in the wall
Troubleshooting
Stepped crack in the mortar joints
Monitor it with dated photos and seek professional assessment if it is growing, appears in several places, or is near an opening or corner. Stable minor cracking may only need repair after the cause is checked.
Wall bulges or leans
Treat this as urgent. Keep people away from the area and get a qualified professional to inspect it. Do not try to push it back, repoint it, or remove individual bricks yourself.
Mortar is powdery or falling out
Arrange repointing with a mortar suitable for the age and type of brickwork, but first check for damp sources such as leaking rainwater goods or trapped moisture.
Brick faces are flaking or breaking away
Check for prolonged damp, freeze-thaw exposure, incompatible hard mortar, or previous sealing treatments. Damaged bricks may need replacement and moisture sources should be corrected first.
White powder on bricks
This is often salt deposit from moisture movement. Brush it off when dry and investigate where water is entering or being retained. Persistent recurrence needs further diagnosis.
Damp patch indoors opposite an external brick wall
Check the outside for cracked mortar, failed sealant, blocked cavities or weep holes, high ground levels, and leaking gutters or flashings. If the source is not obvious, get a professional inspection.
A few bricks feel loose
Do not rely on filler or surface mortar. Local rebuilding may be needed so the bond is restored properly. Keep the area clear if there is any chance of falling masonry.
Compare your options
Monitor and maintain
Best for: Small, apparently stable defects such as slight local mortar wear with no sign of movement
Pros: Lower cost, avoids unnecessary work, useful for confirming whether a defect is active
Cons: Not suitable if there is bulging, active cracking, loose masonry or ongoing damp
Local repair or repointing
Best for: Limited areas of failed mortar, isolated damaged bricks, or defects caused by a clear local issue
Pros: Can stop water ingress early, less disruptive than major rebuilding
Cons: Will fail again if the underlying cause is not fixed or if unsuitable materials are used
Professional structural assessment and remedial work
Best for: Bulging walls, significant cracking, chimney defects, retaining walls, or widespread deterioration
Pros: Addresses root cause and safety risk, appropriate for loadbearing or unstable masonry
Cons: More costly and may involve more extensive work
| Option | Best for | Pros | Cons |
|---|---|---|---|
| Monitor and maintain | Small, apparently stable defects such as slight local mortar wear with no sign of movement | Lower cost, avoids unnecessary work, useful for confirming whether a defect is active | Not suitable if there is bulging, active cracking, loose masonry or ongoing damp |
| Local repair or repointing | Limited areas of failed mortar, isolated damaged bricks, or defects caused by a clear local issue | Can stop water ingress early, less disruptive than major rebuilding | Will fail again if the underlying cause is not fixed or if unsuitable materials are used |
| Professional structural assessment and remedial work | Bulging walls, significant cracking, chimney defects, retaining walls, or widespread deterioration | Addresses root cause and safety risk, appropriate for loadbearing or unstable masonry | More costly and may involve more extensive work |
Alternatives
- Use a chartered building surveyor or structural engineer for diagnosis before hiring for repairs if the cause is unclear
- For historic or older solid-wall buildings, seek a contractor experienced in traditional masonry rather than general patch repair
Pro tips
- Always photograph defects from the same spot each time so changes are easier to see
- Inspect brickwork after heavy rain and again in dry weather; moisture-related patterns often become clearer
- Pay extra attention to parapets, chimneys and free-standing garden walls because they are more exposed
- If one area keeps failing, look above it for the water source rather than repairing the same patch repeatedly
- Older brickwork often needs compatible repair materials; matching the existing wall matters
Safety notes
- Do not inspect unstable walls, chimneys or high brickwork at close range if there is any risk of falling masonry
- Do not climb onto walls or use ladders unless you are trained and properly equipped
- Wear eye protection and gloves if checking loose mortar or brushing off salt deposits
- Keep children and others clear of any wall that is bulging, leaning or shedding bricks
Legal & regulatory notes
Structural repairs, boundary walls, retaining walls, work affecting fire separation, and changes to loadbearing elements may need consent, professional design, or compliance with local building rules. Requirements vary by location, so check with your local council or building authority before major repair work.
What this guide does not cover: This guide helps you spot common brickwork problems early, but it does not diagnose every cause or replace an on-site assessment. It does not cover detailed structural design, heritage conservation specifications, or step-by-step repair methods for unstable or loadbearing masonry.
Cost considerations
Early maintenance such as correcting rainwater defects or repointing a small area is usually far cheaper than rebuilding a wall after movement or water damage has spread. Costs rise quickly when access is difficult, bricks need matching, or the cause is structural rather than cosmetic.
Prefer to hire a professional?
If this job is beyond a confident DIY — or the work needs to be done by a licensed professional — you can find a verified builder or licensed tradesperson through these directories of real, verified trade businesses. Compare local tradespeople, read their details and request quotes before you commit.
Frequently asked questions
How can I tell if a crack is serious?+
A crack is more concerning if it is getting worse, appears with bulging or leaning, runs through multiple areas, or is around doors, windows, corners or a chimney. If in doubt, treat movement as potentially structural and get it assessed.
Is crumbling mortar always a sign of bad bricklaying?+
No. Mortar can fail because of age, weather exposure, trapped moisture, incompatible previous repairs, or movement. Poor workmanship is only one possible cause.
Can I just fill cracks with sealant or mortar?+
Only for very minor non-structural defects, and only after the cause is understood. Filling active or movement-related cracks without diagnosis can hide the problem while it worsens.
What does white powder on bricks mean?+
It usually suggests salts being carried to the surface by moisture. The deposit itself is often less important than the reason the wall is getting wet.
When should I call a professional straight away?+
Call promptly if the wall bulges or leans, bricks are loose, cracks are changing, part of the wall sounds hollow or unstable, there is repeated damp with visible deterioration, or the masonry is loadbearing, retaining or high level.
Sources & references
Guidance on this page is traced to documented sources. Last checked 25 September 2026.
- NHBC - Foundations and masonry topics in technical guidance · industry
Supports general guidance on masonry defects, cracking, movement and the importance of proper construction and moisture management in residential buildings.
- New Zealand Government - Building Performance · government
Supports checking local compliance requirements and recognising that some building work and structural repairs may require consent or professional input in New Zealand.
The defect-spotting principles stay fairly stable, but local compliance requirements and recommended repair methods can vary by building type, age and location.