Chimney Waterproofing Services In South West London & SE Surrey
Water is the biggest threat to your chimney. Once it gets in, it starts breaking things down from the inside. We stop it getting in at all.
Abel Roofing covers London and Surrey. We treat chimneys properly so you are not dealing with damp walls and ceiling stains further down the line.
Were Rated Excellent In The Area
“Repair/replacement of roof”
Job location: GU15
“Complete Roof Replacement”
“This is the second large job Abel Roofing have completed for us in the last 12-months. Same high standard of workmanship and customer service. Cliff and his team are brilliant and we couldn’t recommend them highly enough.”
Job location: GU15
“Replacing flat roof after storm damage”
Job location: SW11
“A first rate job”
Job location: RG27
“Fantastic Service, Fantastic People”
Job location: SW4
Keeping Water Out for Good
A chimney sits fully exposed to the weather all year round. Rain, frost, and wind work their way into any crack or weak point they can find. Once water is inside the brickwork, it freezes in winter, expands, and breaks the structure apart piece by piece. Most homeowners only notice when there is already damp inside the house.
Chimney waterproofing deals with this at the source. We seal the brickwork, fix the mortar, sort the flashing and make sure the cap on top is doing its job. The result is a chimney that sheds water rather than soaking it up.
It is one of the most straightforward ways to protect your home. The treatment is not expensive, and it stops problems that are. Abel Roofing carries out chimney waterproofing across London and Surrey using materials rated for the UK climate.
What Is Chimney Waterproofing?
Chimney waterproofing is the process of treating every surface and joint on your chimney that water can use to get inside. It covers the brickwork, the mortar, the crown at the top, the flashing where the chimney meets the roof and the cap that sits on the pot.
Some treatments are surface sealants that coat the brickwork and repel water. Others are repairs fixing the mortar, resealing the crown or replacing a flashing that has given up. Most chimneys need a combination of both.
It does not change how your chimney looks. A good waterproofing treatment is invisible once it is done. What changes is what happens the next time it rains.
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Why You Should Not Leave It
It Gets Worse Every Winter Water that gets in freezes. When it freezes, it expands. That expansion forces cracks wider. Every winter that passes without treatment does more damage than the last.
Damp Spreads Inside the House A wet chimney breast transfers moisture into the wall. Once damp is in the wall, you are dealing with plaster, insulation and decoration. The chimney repair bill becomes a much bigger renovation bill.
It Flags on Surveys Buyers’ surveyors check chimneys. A chimney with visible water damage, crumbling mortar or staining will be flagged in the report. That can affect your sale price or hold up a sale completely.
Early Treatment Is Cheap Waterproofing a sound chimney costs a fraction of what it costs to repair a damaged one. Catching it early is always the more affordable option. We give you a straight price before any work begins.
We Know What We Are Doing Abel Roofing has been treating chimneys across London and Surrey for years. We use products designed for the UK climate and back our work with proper paperwork so you have a record of what was done.
One Job Protects for Years A professionally applied waterproofing treatment can last well over a decade. It is not something you need to do every year. One job, done right, gives you long-term peace of mind.
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🛠️ Our Chimney Waterproofing Locations 🛠️
Take a look at our Chimney Waterproofing Locations here:
Chimney Waterproofing Frequently Asked Questions
Chimney waterproofing involves sealing all the surfaces and joints on your chimney that water can penetrate. This includes the brickwork, mortar, crown, flashing and cap. Breathable sealants are applied to the masonry so water runs off rather than soaking in, and any damaged sections are repaired before treatment begins.
Common signs include damp patches on the chimney breast inside the house, white staining on the external brickwork, crumbling or receding mortar joints, cracks in the crown or around the flashing, and musty smells in rooms near the chimney. If your chimney has not been treated in over ten years, a survey is a good idea regardless of visible symptoms.
No. We use breathable, clear waterproof sealants that do not change the colour or texture of the brickwork. Once the treatment has dried, your chimney looks exactly as it did before — it simply repels water instead of absorbing it.
When applied properly using the right products, a chimney waterproofing treatment typically lasts between ten and twenty years. Longevity depends on weather exposure and the condition of the chimney at the time of treatment. We use products designed for the UK climate and apply them correctly so you get the full lifespan from the treatment.
Yes, but the damaged areas need to be repaired first. Applying a sealant over cracked mortar or a broken crown will not solve the underlying problem. We assess the chimney, carry out any necessary repairs and then apply the waterproofing treatment so the work is done in the right order.
Flashing fails due to age, thermal movement and corrosion. As the chimney and roof expand and contract with temperature changes, the seal between them works loose over time. Poor original installation also plays a role. Once the flashing lifts or cracks, there is a direct route for water to enter the roof and walls below.
This depends on the height and location of the chimney. Some chimneys can be safely accessed by ladder for treatment, but most work of this kind requires scaffolding to be done properly and safely. We assess this during the initial inspection and include the cost of any access equipment in your quote upfront.
Most sealants and repair materials need dry conditions and temperatures above freezing to cure correctly. We can carry out chimney waterproofing through autumn and into winter provided the conditions are suitable. We will advise you on timing and will not carry out work that cannot be completed to a proper standard because of the weather.
The chimney crown is the concrete or mortar layer that sits at the very top of the chimney stack, surrounding the pot. It slopes outward to direct water away from the flue. Over time, it cracks due to weather and thermal movement. Cracks in the crown allow water to enter the chimney structure directly and must be repaired and sealed.
No. We use breathable waterproofing products that allow moisture vapour to escape from the brickwork naturally. This means the flue and internal workings of the chimney continue to function normally. The treatment is purely external and does not interfere with airflow or combustion.
The cost depends on the size of the chimney, its condition and whether any repairs are needed before treatment can be applied. We provide a full, itemised quote before any work starts so you know exactly what you are paying for. Call us on 07789 182040 to arrange a free survey and quotation.
Yes. We provide written confirmation of the work carried out, the products used and any guarantees that apply. This is useful for your own records and also reassures buyers or surveyors if you sell your home in the future.
Yes. Chimney waterproofing applies to the exterior masonry and structural components only. It has no effect on the flue or on the chimney’s ability to draw. A waterproofed chimney functions in exactly the same way — it just does not let water in from the outside.
We cover London and Surrey, including South West London, South East London, the surrounding boroughs and into the Surrey commuter belt. If you are not sure whether we cover your area, give us a call on 07789 182040 and we will confirm straight away.