Protect your chimney, roof, and home with professional flaunching repairs from Astral Roofing.
Damaged or deteriorating chimney flaunching is one of the most common and most overlooked causes of chimney leaks and structural issues. At Astral Roofing, we provide expert chimney flaunching and re-flaunching services to restore the weatherproof integrity of your chimney stack and prevent costly long-term damage.
Whether you’re seeing cracks in your chimney crown, water ingress in the loft, or just want peace of mind, our qualified team is here to help. With years of experience and a reputation for reliable workmanship across Hertfordshire, we deliver safe, long-lasting repairs you can trust.
What is Chimney Flaunching?
Chimney flaunching refers to the angled cement or mortar bedding that sits on top of the chimney stack, securing the chimney pots in place and helping to shed rainwater away from the stack itself.
Also known as chimney haunching or chimney crown mortar, this protective layer plays a vital role in:
- Stabilising chimney pots against wind and weather
- Preventing water ingress into the brickwork and flue system
- Directing rainwater safely off the top of the stack
- Sealing the upper portion of the chimney against frost and moss damage
Over time, exposure to harsh UK weather causes flaunching mortar to crack, crumble, or detach leaving the chimney vulnerable to leaks, instability, and brick deterioration.
Left untreated, damaged flaunching can lead to water staining, internal damp patches, loose chimney pots, and even falling masonry.
That’s why timely inspection and repair by experienced roofers is so important.
Common Signs of Damaged Chimney Flaunching
Recognising early signs of flaunching failure is essential to avoiding water ingress, chimney instability, and costly structural repairs. At Astral Roofing, we often identify chimney flaunching issues during routine roof inspections especially on older or exposed properties.
Here are the most common warning signs that your flaunching may need repair or full re-flaunching:
Visible Signs to Look Out For
- Cracked or crumbling mortar at the top of the chimney stack
- Loose, leaning, or unstable chimney pots
- Moss or vegetation growing in or around the flaunching area
- Mortar fragments or debris on the roof or in the gutters
- Water marks or damp patches in the loft or upper rooms
- Internal chimney flue leaks or staining on internal walls
- Birds or pests gaining access through gaps in the chimney crown
When to Act
If you notice any of the above signs especially following heavy rain, wind, or frost, it’s important to arrange a professional inspection as soon as possible. Neglecting chimney flaunching issues can lead to further deterioration, damage to the chimney stack, and potential safety hazards.
Did you know?
A single dislodged chimney pot caused by failed flaunching can lead to thousands of pounds in repairs and poses a serious risk to people and property below.
Our Chimney Flaunching Services
At Astral Roofing, we provide a complete range of chimney flaunching services tailored to the condition of your chimney stack and the severity of the damage. From minor mortar repairs to full re-flaunching and chimney pot rebedding, our qualified team ensures every job is completed to the highest standard safely, efficiently, and in full compliance with building regulations.
Chimney Flaunching Repairs in Hertfordshire
For chimneys showing early signs of wear, such as hairline cracks or small patches of erosion, a targeted flaunching repair may be sufficient. This involves:
- Removing any loose or failing mortar
- Repointing or patching affected areas with fresh, weatherproof mortar
- Ensuring the existing flaunching remains securely bonded
- Checking and re-seating any slightly loosened chimney pots
Ideal for: Minor deterioration, early-stage cracks, or preventative maintenance
Full Chimney Re-Flaunching
If your flaunching is severely cracked, loose, or has failed completely, we recommend a full re-flaunch. This involves:
- Complete removal of all existing mortar from the chimney crown
- Thorough cleaning and preparation of the chimney top
- Application of a new, angled flaunching bed using high-strength mortar
- Re-bedding of chimney pots to ensure a firm, wind-resistant hold
- Smoothing and shaping the new mortar for maximum water run-off
Built to Last: Our re-flaunching work is carried out using robust materials and best-practice techniques to withstand extreme weather and seasonal expansion.
Additional Chimney Services
In many cases, damaged flaunching may be part of a wider issue affecting the chimney stack. That’s why we also offer:
- Chimney repointing (replacing mortar joints between bricks)
- Chimney pot replacement or removal
- Lead flashing repairs around the chimney base
- Chimney stack removal or capping (where safe and appropriate)
All work is fully insured and carried out by our experienced roofing team with proper access equipment and site safety controls.
Chimney Flaunching Repair Cost (2025)
Understanding the cost of chimney flaunching work is an important part of planning your roof maintenance. At Astral Roofing, we believe in transparent, honest pricing with no hidden extras. Below is a guide to the average ballpark costs for chimney flaunching-related services in 2025.
Average Chimney Flaunching Costs (Excl. VAT)
| Service Type | Estimated Cost Range | Description |
|---|---|---|
| Minor Flaunching Repairs | £150 – £250 | Patching small cracks, re-pointing localised areas |
| Full Chimney Re-Flaunching | £300 – £500 | Full mortar removal and new angled flaunching installation |
| Chimney Repointing | £250 – £400 | Replacement of mortar joints around chimney stack |
| Chimney Pot Replacement | £100 – £200 per pot | Removal and rebedding or installation of new pots |
| Scaffolding (if required) | £200 – £600 | For properties above single-storey or with difficult access |
Important: These are approximate figures based on typical UK domestic properties. Final costs depend on roof height, chimney condition, access requirements, and any additional work identified during the survey.
What Affects the Cost?
- Height and access – two-storey or steeply pitched roofs may require scaffolding
- Extent of damage – minor cracks cost less than a complete re-flaunch
- Additional repairs – repointing, flashing or pot replacement may be necessary
- Location – roofing labour rates vary slightly by region (e.g. higher in London/South East)
Tip: Bundling multiple chimney or roof repairs at the same time can often reduce overall costs, especially where scaffold access is needed.
Why Timely Flaunching Repair Matters
While chimney flaunching may seem like a small detail at the top of your property, its role in protecting your home is critical. When flaunching is left cracked, loose, or eroded, it can quickly escalate into serious structural and safety issues, not only for the chimney but for the wider roof and interior of your home.
Below are the key reasons why prompt flaunching repair or re-flaunching should never be delayed:
Prevents Water Ingress
Damaged flaunching allows rainwater to seep into the chimney structure and surrounding roof area. Over time, this can cause:
- Damp patches on ceilings or upper floors
- Water-stained plasterwork or mould growth
- Internal damage to chimney liners or flues
- Accelerated brickwork deterioration
Protects Chimney Stability
The flaunching holds the chimney pots firmly in place. When it fails, chimney pots can become loose or dislodged, especially during high winds posing a serious risk to people, vehicles, and property below.
Health & Safety Risk: Loose chimney pots are a known hazard and can invalidate insurance policies if not properly maintained.
Avoids Costly Structural Repairs
Neglected flaunching often leads to widespread mortar failure across the chimney stack. This can necessitate:
- Full chimney repointing
- Chimney rebuilds
- Internal plaster and ceiling repairs
- Roof and flashing replacement
All of which are far more expensive than a routine flaunching repair.
Maintains the Value and Integrity of Your Property
A well-maintained chimney reflects well on your overall property condition and can help preserve value, particularly if you’re planning to sell or remortgage. Surveyors often flag chimney issues as part of structural reports, and poor flaunching is one of the most common findings.
Pro Tip: Regular roof inspections especially after storms or freezing weather, are the best way to catch flaunching issues early and avoid long-term damage.
Why Choose Astral Roofing for Chimney Flaunching Services?
When it comes to chimney flaunching, experience, safety, and workmanship matter. At Astral Roofing, we’re proud to be Hertfordshire’s trusted roofing specialists offering dependable chimney repairs, re-flaunching, and associated services backed by decades of hands-on expertise.
We don’t just patch problems; we solve them properly.
What Sets Us Apart
- Specialists in Chimney Work: From flaunching repairs to complete stack rebuilds, our roofers have the tools, training, and technical knowledge to carry out work safely and correctly – first time.
- Local and Trusted: Based in Hertfordshire, we’re a local business with a strong reputation built on word of mouth, reliability, and repeat customers across the county and beyond.
- Fully Insured and Qualified: All work is carried out by trained professionals, fully covered by public liability insurance and health & safety compliant.
- Clear, Honest Pricing: We provide itemised quotes, free surveys, and no pushy sales tactics. Just expert advice and solutions tailored to your property and budget.
- Customer Satisfaction Guaranteed: We take pride in our work and offer guarantees on both labour and materials. Your chimney is in safe hands with Astral Roofing.
Get a Chimney Flaunching Quote
Concerned about damaged flaunching on your chimney? Don’t wait for a small issue to become a costly repair. At Astral Roofing, we make it easy to get the expert help you need.
Call us on 08000 868 468 or click here to request your free quote.
Let Astral Roofing restore your chimney’s integrity with professional flaunching services you can rely on.
