A Guide to Brickwork Repairs & Masonry Maintenance
Common Brickwork Failures and Their Causes
Brickwork is one of the most durable building materials available, but it is not indestructible. Over decades of exposure to the British climate, various forms of deterioration can occur. Understanding the common types of brickwork failure helps homeowners across Slough, Berkshire, and the surrounding areas recognise problems early and arrange timely repairs before minor issues become major structural concerns.
Spalling is the most visible form of brick deterioration. It occurs when moisture trapped inside the brick expands during freezing, forcing the outer face of the brick to flake or pop off. Spalling is particularly common on exposed elevations facing the prevailing weather, on chimney stacks, and on brickwork below leaking gutters or overflows. Soft, handmade bricks — the kind found on many pre-war properties across Berkshire and Surrey — are especially susceptible because their porous structure absorbs more moisture than dense modern bricks.
Cracking in brickwork can have several causes. Thermal expansion and contraction causes fine cracks that typically follow the mortar joints in a stepped pattern. Subsidence or ground movement causes more serious diagonal cracks that may extend through both the bricks and the mortar, often widening towards the top of the wall. Impact damage from vehicles or falling objects creates localised cracking. Overloaded lintels cause horizontal cracking above window and door openings. Each type of crack tells a different story, and identifying the cause is essential before planning the repair.
Mortar failure is the most common brickwork problem we deal with across the Home Counties. Mortar joints deteriorate faster than bricks because the mortar is designed to be softer and sacrificial. When mortar recedes or crumbles, water penetrates the joints, and the brickwork loses its weatherproofing. If left for too long, the structural integrity of the wall is compromised as the bricks lose their bonding medium. Repointing at the right time is the most cost-effective form of brickwork maintenance available.
- Spalling: brick faces flaking due to frost damage — caused by trapped moisture
- Stepped cracking: usually follows mortar joints — often indicates thermal movement
- Diagonal cracking through bricks: may indicate subsidence — seek structural advice
- Mortar recession: joints wearing back from the brick face — repointing is needed
- Efflorescence: white salt deposits on the surface — usually harmless but indicates moisture movement
- Sulphate attack: mortar expanding and cracking — common on chimneys and below DPC
Matching Bricks on Period Properties
One of the most challenging aspects of brickwork repair is achieving an invisible match on older properties. The bricks used in Victorian, Edwardian, and Georgian buildings across Berkshire and Surrey were often produced in local brickworks using local clays, giving them distinctive colours, textures, and sizes that are difficult to replicate with modern machine-made bricks.
The first approach we try is sourcing reclaimed bricks. There are specialist reclamation yards across the Home Counties that stock bricks salvaged from demolition sites, and with experience, we can usually identify the brick type and source a close match. London stocks, for example, are characterised by their yellow-brown colour with grey and pink variations — they were the dominant brick type in South-East England from the Georgian period through to the early twentieth century and are widely available from reclamation suppliers.
When reclaimed bricks are not available or the original bricks are an unusual type, we look at modern reproduction bricks. Several manufacturers now produce handmade bricks that closely replicate historic styles. These are more expensive than standard facing bricks but achieve a far better match than using off-the-shelf modern bricks. We always bring brick samples to the property and compare them against the existing brickwork in different lighting conditions — bricks can look very different in morning light versus afternoon light, and in wet conditions versus dry.
The mortar is equally important for achieving a good match. Even perfectly matched bricks will look wrong if the mortar colour, texture, or joint profile is different from the original. We prepare bespoke mortar mixes using appropriate sands and, where necessary, natural pigments to match the existing joints. For listed buildings and properties in conservation areas across Buckinghamshire and Greater London, this level of care is not just aesthetic — it may be a condition of Listed Building Consent or conservation area regulations.
Structural vs Decorative Brickwork Repairs
Not all brickwork repairs are the same. Some are purely cosmetic — replacing a few spalled bricks or repointing a section of wall to improve its appearance and weatherproofing. Others are structural — addressing cracks, failed wall ties, damaged lintels, or collapsed sections that affect the stability and load-bearing capacity of the wall. Understanding the difference is important because structural repairs require a different approach, different skills, and sometimes the involvement of a structural engineer.
Decorative or maintenance repairs include brick replacement, repointing, cleaning, and minor crack filling. These repairs address surface-level deterioration and can usually be carried out by experienced bricklayers without structural calculations. They are important for maintaining the weatherproofing and appearance of the brickwork, and we recommend regular inspection and timely maintenance to prevent small problems escalating into structural ones.
Structural repairs address problems that affect the stability or load-bearing capacity of the brickwork. These include crack stitching — inserting stainless steel helical bars into the mortar joints across a crack to tie the brickwork back together. Wall tie replacement is another common structural repair in this area, particularly on cavity-wall properties from the 1920s to 1970s where the original galvanised wall ties have corroded, causing horizontal cracking along the mortar courses. Lintel repairs or replacements above windows and doors prevent the brickwork above from cracking and dropping.
At Dripstop Roofing, we carry out both decorative and structural brickwork repairs. For structural work, we always ensure the repair is properly specified — either by following established best-practice methods for standard issues like wall tie failure, or by working to a structural engineer's design for more complex problems. We can recommend trusted local engineers in Berkshire and Surrey if you do not already have one.
Damp and Brickwork: Causes, Diagnosis, and Solutions
Damp and brickwork are intimately connected. Most damp problems in homes across Slough, Berkshire, and the surrounding areas have their origin in failed brickwork, missing or bridged damp-proof courses, or inadequate drainage around the base of external walls. Understanding how moisture interacts with your brickwork is key to diagnosing and solving damp problems effectively.
Rising damp occurs when moisture is drawn upward from the ground through the brickwork by capillary action. In most post-1875 properties, a damp-proof course (DPC) — originally slate, bitumen, or engineering brick — prevents moisture from rising above the base of the wall. When the DPC fails, is missing, or has been bridged by raised external ground levels, paths, or renders, moisture rises through the brickwork and causes damage to internal plaster and decoration. The solution involves either installing a new chemical DPC, lowering external ground levels, or removing renders that bridge the existing DPC.
Penetrating damp through brickwork is caused by rain being driven through cracks, failed mortar joints, or porous bricks. This is especially common on exposed elevations facing the prevailing south-westerly weather. Repointing, brick replacement, and in some cases applying a breathable water-repellent treatment to the brickwork surface can resolve penetrating damp. We always identify and treat the external cause rather than simply dealing with the internal symptoms.
We work closely with damp specialists where necessary, but in many cases, the solution is straightforward brickwork repair. Repointing failed joints, replacing spalled bricks, and ensuring the DPC is not bridged resolves the majority of damp problems we encounter across the Home Counties. Call us on 07405 391861 for a free assessment if you suspect your brickwork is contributing to a damp problem.
