Greater London · England
External & façade joints in Twickenham, Greater London
Specialist external mastic for Twickenham: careful preparation, the right product and tidy work. Call for a quick quote.
- Damp patches traced to an open external joint
- Weeds or debris growing in open joints
- Hard, crazed mastic that has stopped moving
When it is not the sealant
We won’t take on work that won’t last, so here’s what sealant can’t put right:
- Damp that is not coming from the joint
- Cracks in the bricks or render themselves, away from the joints
- Structural movement, which needs a surveyor or engineer
If you are not sure, just ring 0345 464 0079 or send us an email and we will give you a straight answer.
Joints and surfaces we work on
- Render & cladding joints
- Brickwork movement joints
- Concrete & block
- Copings & trims
- Joints between brick and frames
- Façade panels
External mastic in Twickenham
Joints in render and cladding are easy to overlook until a damp patch appears. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant. We work on joints between brick and frames, façade panels and brickwork movement joints, and people most often call us about failed sealant between panels on a façade and movement joints with cracked, split or missing sealant.
London’s terraces and conversions often share walls, gutters and downpipes with their neighbours, so one failed joint can cause damp for more than one household. For a flat in Twickenham, check the lease for who looks after the outside.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Where
- Twickenham (TW1, TW2, TW4, TW3)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Do you need external mastic in Twickenham?
The wrong product in a moving joint is a classic cause. A stiff, general-purpose sealant can’t cope with a joint that moves a lot, so it pulls away from the edges.
Common reasons people contact us include:
- Gaps where render, brick and frames meet
- Damp patches traced to an open external joint
- Rigid filler in a joint that should flex
- Failed sealant between panels on a façade
For site and facilities teams at buildings such as St Richard Reynolds Catholic Primary School, larger buildings have long runs of movement joint that eventually need resealing.
Before you book anyone
- Is the old sealant removed completely?
- What the cure time is
- How the surfaces are prepared before sealing
- How much experience the applicator has
External mastic in Twickenham: local notes
London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Historic houses such as Richmond House, about 0.5 miles east, show how far back building around Twickenham goes. Rented homes near Twickenham station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Twickenham is about 7 miles south-west of Kensington, in Greater London. Jobs in Twickenham get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. Twickenham is one of 764 places in Greater London where we work. We also work in London, about 11 miles from Twickenham.
Here we cover the TW1, TW2, TW4 and TW3 postcode area for external mastic. You will find streets such as Station Road, London Road and Talbot Road. You will find Twickenham on the A305 and A310, which makes it straightforward to reach. Other places close to Twickenham include Whitton (1 mile west), Eel Pie Island (1 mile east), Strawberry Hill (1 mile south), Ivybridge (1 mile north) and Fulwell (1 mile south). We also work in nearby towns such as London (11 miles east), City of Westminster (9 miles north-east), Marylebone (10 miles north-east), Kensington (7 miles north-east), St Pancras (11 miles north-east) and Shoreditch (12 miles north-east).
Landmarks near Twickenham
We work in homes and buildings around Richmond upon Thames School, St Richard Reynolds Catholic High School and Marble Hill Park and the streets around them. For rail, the closest station is Twickenham station, about 0.5 miles north-east. Nearby you will also find Eel Pie Island Museum (0.6 miles east) and Treaty Centre (1.8 miles north-west). Not far away are Richmond Hill and Ham Lands.
What happens on the day
We keep the work tidy and contained to the joints we’re treating, so you can get on with your day. Expect the work to take a few hours for a handful of joints, longer for a whole elevation, and we tell you how long to leave it before we go. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Twickenham. A visitor permit or a nearby bay makes the visit run more smoothly.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Before we arrive
- Mention if the joints have been sealed before
- Tell us if parking is tricky
- Let us know if you’ve seen damp or leaks
Get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job. When it suits you, call 0345 464 0079 or email us.
Read more
How to look after the new joints
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Ask before painting over external sealant
- Act on the first splits you see
- Look over the joints every year, ideally after winter
- Fix overflowing gutters above sealed joints
Look over the joints once a year, ideally after winter. Splits, gaps at the edges or plants in the joint are early warning signs.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.
Common questions in Twickenham
Is parking a problem for a job in Twickenham?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.
Do you cover Twickenham for external mastic?
Yes. Our work covers London and the South East, and Twickenham is part of that. You can call 0345 464 0079 or email us and tell us what needs doing.
Do you do commercial work?
Yes. Commercial and hotel work is a large part of what we do. We can talk about working times when we quote.
Can landlords and businesses book you?
Yes. As well as homeowners, we work for landlords, agents, businesses and hotels.
Is the work guaranteed?
Yes. Every job comes with our 12-month guarantee.
Why do you put foam in the joint first?
Backing rod goes into deeper joints as a matter of course. It sets the sealant depth and prevents three-sided bonding.
Do I have to be there?
If the work is inside, we need someone to let us in. Once we’ve agreed the job, you do not need to watch us work.
Can you seal over the old sealant?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. It all has to come out first.
Different surfaces, different methods
Joints between dissimilar materials
Wherever two materials meet, they move differently. We seal the joint with a flexible exterior sealant so neither cracks the other.
Concrete and blockwork
Blockwork and concrete shrink over time and move with the seasons. Their movement joints are sealed over backing rod with a flexible sealant.
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
Towns and villages near Twickenham
Other services in Twickenham
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too in Twickenham and across Greater London. Several sites can be quoted together, and we are fully insured for the work.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.