Expansion Joint Sealing in Gunnersbury
Expansion joint sealing for Gunnersbury, from a contractor working since 2005. Fully insured and CHAS accredited.
- Leaks through car park deck joints onto the level below
- New sealant over old, now failing
- Movement joints with split or torn sealant
Expansion joint sealing near Gunnersbury
Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.
About our expansion joint sealing in Gunnersbury
Mastic Doctor has sealed movement joints since 2005, for main contractors, FMs, managing agents and building owners. CHAS accredited, Constructionline member, CSCS-carded applicators and five million pounds of public liability insurance. Workmanship is backed by our 12-month guarantee. We work on brickwork movement joints, car park decks and ramps and precast concrete panel joints, and the failures we’re asked to look at most are movement joints with split or torn sealant and chipped joint edges on forklift routes. One point of contact handles commercial sealant work in Gunnersbury from the first photographs to the final walk-round, whether it’s one building or several.
Floor and movement joints in London take heavy use: car park decks, loading bays, shopping centre malls and podiums over occupied space. When a joint fails, grit and water get in and the arrises start to break up.
The 12-month guarantee is for workmanship rather than wear and tear. How long a sealant joint lasts depends on movement, exposure, cleaning and use, so we’re clear about what is covered before work starts.
- Location
- Gunnersbury (W4, W3, TW8)
- Region
- Greater London
- Guarantee
- A 12-month guarantee
- Quote
- Fixed quote, scope in writing
- Telephone
- 01277 525 020
- Page updated
- 3 November 2026
FAQs: Gunnersbury
Can you work at a site such as Kew Retail Park, by Gunnersbury?
Yes, sites like Kew Retail Park are within our area, along with the rest of Gunnersbury. Photos and a short description are enough for a first look.
Can you take on a job at a hospital such as Clayponds Hospital?
Yes, hospitals are one of the sectors we cover. The estates team’s permit system and infection-control rules come first, and the work is planned around them.
Will your applicators have CSCS cards?
Yes. We use CSCS-carded applicators.
What’s the difference between an expansion joint and a movement joint?
Put simply, it’s a planned break in a wall, slab or deck so the materials can move. Many people call it an expansion joint and both need a flexible seal.
Why do our movement joints keep failing?
The common causes are poor preparation, three-sided adhesion, the wrong movement class and weathering. Working out the cause comes first.
Can you follow the specification on our project?
Yes. Include it with the drawings when you ask for a quote, and the quote will be based on it, flagging anything that needs clarifying.
Do you seal on top of existing sealant?
No, never. Overlaying old sealant is a frequent cause of early failure, so it all comes out first.
Why deal with it now?
Leaving a failed movement joint rarely stays a small problem. Water and debris get in, the joint jams and the edges spall, so a reseal turns into an edge repair as well. Resealing early keeps the work to sealant. Failed sealant in a building in Gunnersbury can quickly affect neighbours, tenants or the floor below: water travels through shared structures, and a small leak becomes a dispute between occupiers. Putting it right early is less disruptive than dealing with the consequences.
Whether it’s a single area or a whole estate, the same things set the price: what’s in scope, how we reach it, what’s specified and when it needs doing. Call for a quote, and you’ll have a fixed figure to work with.
Why clients in Gunnersbury choose us
- A fixed quote before work starts
- Over 20 years of commercial sealing
- Constructionline member
- Failed material removed, not covered up
See our cost guide or our accreditations.
Our process
Inspect, seal, sign off: every visit follows that pattern. We inspect the joints and confirm what’s in scope, then we prepare and seal each joint with the specified product, and we finish with a walk round so the work can be signed off. Planning a London job such as one in Gunnersbury starts with access: booked loading, goods lifts, the building’s permit system and a spot to keep materials. Give us the hours we can be on site and we will schedule to suit.
- The first job is to check each joint: how wide it is, how it moves and why the old seal let go.
- A fixed quote follows, naming the sealant and its movement class.
- The failed seal is removed and both faces are cleaned until sound and dry.
- We control the depth with backing rod or, in shallow joints, bond-breaker tape.
- After any primer the maker requires, the bead is applied and tooled so it grips two sides only.
- Each joint is inspected and handed over with our 12-month guarantee.
Preparing the site
- Send your site hours and access windows
- Send asbestos survey details if the building is pre-2000
- Tell us which areas need to stay in use
Get a fixed quote
Every job follows the same four steps: send details, get a quote, we seal, guaranteed. The first step is to ring 01277 525 020 or send details through our quote form with what you know.
Related advice
Nearby places to Gunnersbury
More services for Gunnersbury
Traffic, movement and joints around Gunnersbury
The 3 miles around Gunnersbury take in at least three named trading estates, business parks or retail parks. Their warehouses, yards and car parks are exactly where joints take the most punishment. London car parks, loading bays and podium decks often can’t close for long, so we seal in sections and hand areas back as each cures.
Phasing is what makes joint work possible on busy sites such as Phoenix Trading Estate (1.1 miles west of Gunnersbury): one bay, aisle or car park row at a time. University campuses such as Richmond American University London (to the east of Gunnersbury) have car parks, paved walkways and building elevations with movement joints.
Gunnersbury is about 1 mile south of Acton, in Greater London. Across the W4 postcode area, it works the same way: details in, fixed quote out, then sealing and a 12-month guarantee. 764 places across Greater London fall within our area, Gunnersbury among them. Our London page has more on work in that area (8 miles or so).
We cover the W4, W3 and TW8 postcode districts for movement joints. Buildings on Kew Road, Kent Road and Power Road are within our area. You will find Gunnersbury on or near the A3000. Close to Gunnersbury, our area also takes in Strand-on-the-Green (1 mile south), Kew (1 mile south), Grove Park (1 mile south-east), Chiswick (1 mile east) and Turnham Green (1 mile south-east). Bigger towns within reach include London (8 miles east), City of Westminster (6 miles east), Marylebone (6 miles east), Kensington (3 miles east), St Pancras (7 miles east) and Shoreditch (9 miles east).
Around Gunnersbury
Recent enquiries here include premises near Clayton Hotel Chiswick, Kew College Prep and Ark Acton Academy, among other places. You’ll also find Turnham Green (0.5 miles east) and Library for Iranian Studies (1 mile north). There’s a railway station in Gunnersbury itself: Gunnersbury station. Nearby you’ll also find Barnes Hospital (2 miles south-east) and Livat Hammersmith (2.1 miles east). For a walk, there’s Kew Gardens Lake and Castlebar Hill.
Aftercare for building managers
Regular inspection catches problems early. Specifically:
- Inspect movement joints alongside other routine building checks
- Note which joints were done, when, and with what
- Clear dirt from joint lines during routine cleaning
- Leave barriers in place until fresh joint sealant has cured
Snow ploughs and scrapers catch on joint lines. Raising blades over joints where possible protects the seal.
On a multi-storey car park, a failed joint typically shows up as a leak onto the deck underneath. That water often carries de-icing salts with it and it can affect the structure over time. Resealing early limits the damage.
Signs you need expansion joint sealing in Gunnersbury
The edges of the material can fail rather than the sealant. If the edge of the joint is friable, the bond fails with it so edge repair has to come before resealing.
Typical triggers for a call:
- Sealant peeling off one face of the joint
- Chipped joint edges on forklift routes
- Layers of sealant in a movement joint
- Joints packed with grit and debris
Places like Kew Retail Park (to the south of Gunnersbury) put trolleys over floor joints inside and cars over slab joints outside.
What your quote should include
- The terms of the workmanship guarantee
- Whether old or failed sealant will be cut out, not overlaid
- What site paperwork they can supply
- How the joint faces will be prepared and primed
Commercial clients in Gunnersbury
For main contractors, we work as the sealant subcontractor on new-build and refurbishment projects. We work to your programme, your specification and your site rules, and our applicators hold CSCS cards.
When you manage a building on behalf of an owner, you need clear quotes and clear reporting. You get a fixed quote, an agreed scope and a walk round at the end.
What the job involves on each surface
Podium joints
Podium joints often sit within a waterproofing system. Where the specification calls for sealant, we reseal.
Car park decks and ramps
Water coming through deck joints is the usual first sign. The old seal comes out, the edges are prepared and the joint resealed, and we will tell you if any edges need repairing first.