Brick Heritage Repointing Specialists
Brick repointing is one of the most important interventions for protecting historic brickwork. Our lime‑only approach restores breathability, stabilises the wall, and preserves the original character of your home. Every project follows conservation‑correct methods and the Lewis™ heritage workflow.
Learn more: Request a Heritage Survey
WHAT BRICK REPOINTING ACTUALLY IS
Brick repointing is the process of renewing the mortar joints that hold historic brickwork together. Over time, weathering, moisture movement and previous cement repairs cause joints to crack, hollow out or fail completely. When this happens, the wall loses breathability, water becomes trapped, and the brick faces begin to erode. Heritage‑grade repointing restores the wall’s ability to manage moisture naturally while protecting the arrises and preserving the original character of the building.
Unlike builder‑grade pointing, heritage repointing uses soft lime mortar that moves with the building, releases moisture safely and prevents long‑term damage. The goal is not to make the wall look new, but to stabilise it, protect it and maintain its historic appearance. Every joint is prepared, compacted and finished using conservation‑correct methods that respect the original fabric of the structure.
Learn more: Lewis Heritage Wall Anatomy
WHY LIME‑ONLY REPOINTING IS ESSENTIAL
Lime‑only repointing is fundamental to the long‑term health of historic brickwork. Traditional brick walls were built to breathe, allowing moisture to move in and out of the structure naturally. When hard cement is used, this movement is blocked, trapping moisture inside the bricks. Over time, this leads to spalling, salt expansion, internal cracking and irreversible damage to the historic fabric.
Lime mortar works in harmony with old brickwork. It is softer, more flexible and vapour‑permeable, allowing moisture to escape safely through the joints rather than through the brick faces. This protects the arrises, reduces freeze‑thaw stress and maintains the wall’s original performance. Lime also self‑heals through carbonation, meaning small micro‑cracks naturally close over time.
Using lime is not an aesthetic choice — it is a conservation requirement. It ensures the wall remains stable, breathable and compatible with the materials it was originally built with. Every heritage brick repointing project must follow lime‑only principles to avoid long‑term structural and cosmetic damage.
Learn more: Lime Mortar Repointing
Historic Brick Types and Material Performance
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Handmade Clay Bricks — Traditionally clamp‑fired, producing natural variation in porosity, mineral content and arris definition. Their breathable structure requires lime‑only mortars with controlled aggregate grading to prevent salt entrapment and ensure long‑term compatibility with the brick fabric. These bricks respond best to low‑strength mixes that remain sacrificial and accommodate moisture movement.
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Soft Red Rubbers — Highly porous Victorian and Georgian bricks that readily absorb moisture. Their fragility demands extremely careful rake‑out to avoid arris loss, and low‑strength lime mortars (NHL 2 or hot‑lime) to maintain vapour permeability. Over‑strong mixes risk compressing the brick face and accelerating decay.
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Gault Bricks — Pale, dense, calcium‑rich bricks common across Oxfordshire and Cambridge. Their reduced moisture movement benefits from fine, compact lime joints that preserve the crisp detailing typical of high‑status heritage façades. Mortar selection must account for the brick’s lower porosity to avoid differential weathering.
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Pressed Victorian Bricks — Mechanically pressed for uniformity, producing sharp arrises and consistent dimensions. These bricks require precise joint formation and controlled compaction to maintain architectural rhythm across premium Victorian elevations. Lime mortars prevent moisture trapping behind the dense brick face.
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Heritage Engineering Bricks — Dense, low‑absorption bricks used in structural or damp‑exposed zones. Despite their robustness, lime mortars remain essential to maintain breathability within the wall core and prevent moisture accumulation behind the brick. Joint formation must be carefully managed to avoid surface glazing or mortar slippage.
THE LEWIS METHOD™
The Lewis Method™ is our structured, conservation‑correct workflow for heritage brick repointing. Every stage is designed to protect historic fabric, maintain breathability and deliver a finish that respects the age and character of the building. We begin with sensitive rake‑out, removing only failed mortar while preserving the arrises and avoiding vibration or brick disturbance. Each joint is cleaned, flushed and prepared so the lime can bond correctly.
Once prepared, the joints are filled using a controlled lime compaction process. This ensures the mortar is firmly pressed into the joint, eliminating voids and creating a durable, breathable bond. Timing is critical: lime must be applied at the correct moisture level, allowed to firm naturally, and finished without smearing or over‑working the brick faces. The final finish is shaped to suit the building’s period style, maintaining authenticity while improving performance.
The Lewis Method™ is not a cosmetic approach — it is a conservation system. Every step follows heritage standards, ensuring the wall performs as originally intended and remains protected for decades. This method is the foundation of all our brick repointing work and is what sets heritage‑grade craftsmanship apart from builder‑grade pointing.
Learn more: Lewis Method™
DEFECTS WE SOLVE
Historic brickwork develops a range of defects when old mortar fails or when inappropriate materials, such as cement, have been used in the past. Cracked joints allow water to enter the wall, leading to damp staining and internal moisture retention. Hollow or loose joints reduce structural stability and create pathways for accelerated weathering. Cement‑filled joints often force moisture into the brick faces, causing spalling, salt expansion and surface loss that permanently damages the historic fabric.
Our lime‑only repointing approach addresses these issues by restoring breathability and ensuring moisture escapes through the joints rather than the bricks. Each defect is assessed individually, allowing us to stabilise the wall, protect vulnerable arrises and prevent further deterioration. The goal is always conservation: repairing the wall in a way that respects its age, materials and original performance.
Learn more: Lewis Heritage Defects Library™
CONSERVATION STANDARDS
Conservation‑grade repointing is defined by compatibility, breathability and respect for historic fabric. Every heritage brick wall was originally built to manage moisture through soft, permeable lime joints. When repairs ignore this principle, the wall becomes stressed, trapping moisture and forcing it into the brick faces. Our conservation standards ensure every intervention supports the wall’s original performance rather than altering it.
We follow strict guidelines on reversibility, meaning all work can be safely removed in the future without damaging the brickwork. Material compatibility is equally important: lime mortar must be softer than the brick, allowing it to take on movement, salts and moisture instead of the masonry itself. Each joint is finished in a way that protects the arrises and maintains the building’s historic character. These standards ensure long‑term stability, authenticity and protection for the structure.
Learn more: Lewis Conservation Standards™
OUR LIME MORTAR
Our lime mortar is designed specifically for heritage brickwork, ensuring full compatibility with the original materials. Every mix is created using high‑purity lime and carefully selected aggregates that match the building’s period character. The mortar is intentionally softer than the brick, allowing it to take on movement, salts and moisture without stressing the masonry. Colour blending is carried out with precision so the finished joints sit naturally within the wall, preserving its historic appearance. This approach ensures long‑term breathability, stability and conservation‑correct performance across every repointing project.
Learn more: Knowledge Hub
COUNTIES WE COVER
We are based in Oxfordshire, our home county and the centre of our lime‑only heritage operations. Most of our work takes place here, close to family and within our preferred working area. For premium heritage repointing, we also travel to Surrey and Greater London, delivering conservation‑correct workmanship for high‑value period properties where specialist expertise is required.
Learn more — Oxfordshire
Learn more — Surrey
Learn more — Greater London
For homeowners who want certainty, clarity and conservation‑correct guidance, the Lewis Global Heritage Hotline™ provides direct access to specialist advice. If your brickwork is showing deterioration, failed joints or signs of cement damage, our heritage team can assess the issue and outline the safest lime‑only solution for your property.
Learn more: Lewis Global Heritage Hotline™