Specialist Brickwork: Traditional vs Modern Techniques

Brickwork is far more than simply laying one brick on top of another. It is a craft that has shaped Kent's built environment for centuries — from medieval churches and Tudor manor houses to Victorian terraces and contemporary new builds. Understanding the difference between traditional and modern brickwork techniques is valuable for anyone planning a building project, particularly if you are extending a period property or seeking a distinctive finish.

Kent's Brick Heritage

Kent has one of the richest brickwork traditions in England. The county's abundant clay deposits — particularly the Weald Clay stretching from Tonbridge through to the Sussex border — fuelled brick production for hundreds of years. Many Kent bricks were hand-made, resulting in subtle variations in colour, texture, and size that give older buildings their distinctive character.

Traditional Kent bricks include:

• Stock bricks: The workhorse of Kent construction. Yellow London stocks and red stocks are the most common, produced by mixing clay with ash or chalk to reduce shrinkage during firing. Their mottled, irregular appearance is unmistakable.
• Red rubbers: Soft, finely textured bricks used for decorative work — gauged arches over windows, string courses, and quoins. These bricks can be rubbed and cut to precise shapes, allowing intricate detailing.
• Blue engineering bricks: Dense, hard bricks used for damp-proof courses, below-ground work, and industrial buildings. Staffordshire Blues are the most well-known.
• Hand-made bricks: Individual bricks shaped in moulds by hand, producing unique variations in each brick. Many Kent buildings up to the early 20th century used locally hand-made bricks.

When extending or renovating these properties, matching the existing brickwork is both an art and a technical challenge.

Traditional Brickwork Techniques

Lime Mortar

Before Portland cement became widely available in the late 19th century, all brickwork was laid using lime mortar — a mixture of lime putty (or hydraulite lime), sand, and sometimes additives like animal hair or pozzolans.

Advantages of lime mortar:

• Flexibility: Lime mortar accommodates minor structural movement without cracking. Cement mortar is rigid and transfers stress to the bricks, causing them to crack instead.
• Breathability: Lime mortar allows moisture to evaporate through the joints, keeping walls dry. Cement mortar traps moisture, leading to damp problems and accelerated brick decay.
• Compatibility: Historic bricks are softer than modern bricks. Using hard cement mortar against soft bricks causes the bricks to spall (flake apart) as the mortar forces the bricks to absorb all movement and moisture.
• Aesthetic authenticity: Lime mortar has a softer, warmer appearance than cement mortar, matching the character of period buildings.

When to use lime mortar:

• Repointing or repairing any building constructed before 1920
• Extending listed buildings or properties in conservation areas
• Working with soft, handmade, or stock bricks
• Any project where breathability and flexibility are priorities

Our approach: We always use appropriate lime mortar when working with period properties in Kent. Using cement mortar on a Victorian terrace in Tonbridge or an Edwardian villa in Tunbridge Wells causes long-term damage that is expensive to rectify.

Traditional Bond Patterns

Bond patterns — the arrangement of bricks in a wall — are both structural and decorative. Common traditional bonds include:

Flemish Bond: Alternating headers (short face) and stretchers (long face) in each course. The most common bond for facing brickwork in Kent's Georgian, Victorian, and Edwardian buildings. Produces an attractive, rhythmic pattern.

English Bond: Alternating courses of all headers and all stretchers. Structurally the strongest bond, commonly used for engineering brickwork, boundary walls, and industrial buildings.

Stretcher Bond: All stretchers (long face) in every course, staggered by half a brick. The standard bond for modern cavity walls. Less visually interesting but efficient for two-leaf construction.

English Garden Wall Bond: Three courses of stretchers to one course of headers. A economical compromise between appearance and structural performance, common for boundary walls.

Header Bond: Entire courses of headers. Used decoratively and for curved walls where the shorter dimension accommodates the curve more easily.

Matching the correct bond pattern is essential when extending period properties. An extension in stretcher bond against a main house in Flemish bond looks obviously wrong and diminishes the property's character.

Decorative Brickwork

Traditional Kent buildings frequently feature decorative brickwork that demonstrates the bricklayer's skill:

• Gauged arches: Precisely cut and rubbed bricks forming elegant arches over windows and doors. Each brick is shaped individually to create fine joints (sometimes less than 1mm).
• String courses: Projecting horizontal bands of brick dividing a facade into sections. Often using contrasting coloured bricks.
• Corbelling: Bricks projecting progressively outward to create decorative features, support eaves, or form chimney caps.
• Diaper patterns: Diamond or zigzag patterns created using bricks of contrasting colour set into the main wall. Found on many Kent oast houses and farmhouses.
• Dentil courses: Bricks set at alternating projections creating a tooth-like pattern beneath eaves or string courses.

Replicating these details when extending or restoring requires genuine specialist skill.

Modern Brickwork Techniques

Cement-Based Mortars

Modern brickwork predominantly uses cement-based mortars (Portland cement, lime, and sand). These mortars are:

• Stronger: Higher compressive strength than lime mortar
• Faster setting: Cement mortar sets within hours; lime mortar takes days or weeks to fully cure
• More consistent: Easier to achieve uniform colour and texture
• Less expensive: Cement is cheaper and more widely available than lime

Modern mortar is entirely appropriate for new builds and extensions using modern bricks. Problems arise only when cement mortar is incorrectly used with historic or soft bricks.

Thin-Joint Masonry

An increasingly popular modern technique using aircrete blocks (such as Thermalite) with 2-3mm thin-joint mortar rather than traditional 10mm beds. Thin-joint construction:

• Is faster to build (larger blocks, thinner joints)
• Provides superior thermal performance
• Creates very flat, true walls
• Requires specialist mortar and training

This technique is common for internal leaves of cavity walls in new builds, with a traditional brick outer leaf providing the aesthetic finish.

Mechanical Fixings and Cavity Ties

Modern cavity walls use stainless steel wall ties at specified centres to connect the inner and outer leaves. Traditional buildings used solid walls or occasionally bonded two leaves together using header bricks. Understanding this distinction is important when extending — the extension's cavity wall must be properly tied and connected to the existing structure.

Brick Matching for Extensions

One of the most important aspects of any extension is matching the existing brickwork. Poor brick matching makes an extension look like an afterthought rather than an integral part of the property. Here is our approach:

Step 1: Identify the existing brick: We photograph bricks in various lighting conditions, examine colour range and texture, measure dimensions (older bricks are often slightly larger than modern standards), and note any distinctive features (sand finish, creasing, colour variation).

Step 2: Source matching bricks: Options include:

• Reclaimed bricks: The best match for period properties. We have established relationships with reclamation yards across Kent and the South East.
• Manufacturer matching: Several brick manufacturers produce ranges specifically designed to match common historic bricks. We can order sample panels for comparison.
• Handmade bricks: For the closest match to pre-1920s brickwork, handmade bricks (from manufacturers like Michelmersh or Furness) replicate the irregular character of originals.

Step 3: Mortar matching: The mortar colour and profile (flush, weathered, recessed) must match existing work. We mix trial batches and compare against weathered mortar on the existing building. Even a perfect brick match looks wrong with the wrong mortar.

Step 4: Laying technique: Matching joint width, bond pattern, and pointing style. Our bricklayers are trained to replicate traditional techniques where required.

When You Need a Specialist

Standard brickwork is within the capability of any competent bricklayer. However, the following situations demand specialist skills:

• Listed building work: Legal requirement for appropriate materials and techniques
• Conservation area extensions: Planning conditions frequently specify brick matching and traditional methods
• Repointing with lime mortar: Incorrect repointing causes irreversible damage to historic brickwork
• Decorative features: Gauged arches, corbelling, and diaper patterns require craft skills beyond standard bricklaying
• Brick matching for visible extensions: Where the junction between old and new is prominent

Need specialist brickwork in Kent? Carey Brothers & Sons combine traditional craft skills with modern construction knowledge. Whether you need a seamless extension match on a Victorian villa or decorative features on a new build, our team delivers brickwork that stands the test of time. Contact us to discuss your project.