Results
The chimney is now:
- Structurally protected
- Fully weather‑tight
- Free from cement contamination
- Finished with a clean, crisp lime mortar joint
- Restored in a way that respects the building’s age and character
The repointing has significantly extended the lifespan of the chimney and improved the overall appearance of the roofline.
Why This Project Matters
Chimneys are some of the most exposed parts of a property, and using the wrong materials — especially cement — can cause serious long‑term damage.
This case study demonstrates:
- Correct conservation practice
- Skilled lime mortar application
- Safe, careful work at height
- Respect for historic fabric
🧱 Double Chimney Stack Repointing — Greatworth
Specialist Lime Mortar Repointing for a Period Property
Project Overview
This project involved the full repointing of a double chimney stack on a period property in Greatworth. The chimney had suffered from weathering, open joints, and failing cement mortar that was no longer protecting the brickwork or the roof junction. As a heritage repointing specialist, the goal was to restore the chimney using correct conservation methods and breathable lime mortar to ensure long‑term stability and weather resistance.
The work required careful access, controlled removal of defective mortar, and traditional hand‑tooled finishing to match the age and character of the property.
Scope of Work
- Full rake‑out of failing mortar
- Removal of inappropriate cement repairs
- Repointing using breathable lime mortar
- Hand‑tooled finish to match the original chimney style
- Careful protection of roof slates and lead flashing
- Final inspection for weather‑tightness and structural integrity
Condition Before Work
The chimney showed several issues typical of older properties:
- Mortar joints were open, cracked, or missing
- Cement patches were trapping moisture
- Weathering had eroded the bedding around the pots
- The stack was losing structural protection
- Water ingress risk was increasing around the flashing
Left untreated, this would eventually lead to brick spalling, internal damp, and potential chimney instability.
Our Conservation Approach
1. Careful Rake‑Out
All defective mortar was removed by hand to avoid damaging the historic brick arrises. No power tools were used on vulnerable areas.
2. Lime Mortar Selection
A breathable lime mortar was mixed to suit the age of the brickwork, ensuring:
- Flexibility
- Moisture movement
- Compatibility with the original materials
This prevents future cracking and allows the chimney to breathe naturally.
3. Traditional Hand‑Tooled Finish
The joints were packed fully and finished by hand to create a clean, durable, heritage‑appropriate appearance.
The finish blends seamlessly with the existing masonry and enhances the chimney’s character.
4. Roof & Flashing Protection
All slates and leadwork were protected throughout the process, ensuring no damage to the surrounding roof structure.
