Greater London · England
Whitton External Mastic
External mastic across Whitton and nearby, with every bit of old sealant taken out first and a one-year guarantee.
- Joints with sealant missing in places
- Failed seals between different materials
- Movement joints filled with mortar instead of sealant
About our external mastic in Whitton
A movement joint is a deliberate break that lets a wall expand and contract. Its sealant has to flex with the building, season after season, and when it fails, the wall takes the strain and water finds a way in. Typical jobs include moss and dirt in joints with no sealant left and old sealant gone brittle and cracked, across façade panels, brickwork movement joints and joints between brick and frames.
Newer London blocks are built with movement joints in brick and render, and with cladding joints sealed with mastic. Older terraces have their own weak points: gutter joints, roofline trims and the joint where an extension meets the original wall.
Big or small, you get the same 12-month guarantee.
- Where
- Whitton (TW2, TW1, TW7)
- Wider area
- Greater London
- Cover
- A year, on every job
- Price
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
The process
On the day, we start by going over the job with you, so you know exactly what we are doing. We protect the surfaces around the joints before any work starts. Most jobs take a few hours for a handful of joints, longer for a whole elevation. For a job in Whitton, parking and access are the things to plan: let us know about parking, the floor we will be working on and any lift or shared entrance.
- First we look over the joints with you, agree which to renew and talk through access.
- We cut out the failed sealant and rake out any dirt or growth.
- Both sides are cleaned back to sound material and primed if needed.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
How to prepare
- For business premises, tell us about site rules or sign-in
- Keep children and pets away from the work area
- Clear items away from the joints we’re working on
Getting a quote
For a quote, phone 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You’ll have a clear quote before any work starts.
Advice
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Avoid pressure-washing directly into sealant joints
- Make sure movement joints aren’t pointed over
- Leave the joints unpainted unless we’ve said otherwise
- Check external joints each spring
Make sure anyone working on the wall later knows where the movement joints are. They must stay as flexible joints, never rendered or pointed over.
Leave a failed movement joint and water keeps getting into the wall. Over time it can mean damp inside, stained render or frost-damaged brick, all bigger jobs than a reseal.
Work for landlords, hotels and businesses
For anyone letting property in or around Whitton, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will quote.
What sealant work can’t fix
A few problems are outside what sealant work can do:
- Damp that isn’t coming from the joint
- Cracking across the wall rather than at a joint
- Subsidence or other structural problems
If you are not sure, just call 0345 464 0079 or email us and we’ll give you a straight answer.
Joints and surfaces we work on
- Façade panels
- Joints between brick and frames
- Brickwork movement joints
- Render & cladding joints
- Copings & trims
- Concrete & block
Leave it or put it right?
An open joint keeps letting water into the wall with every downpour. Wet masonry is more easily damaged by frost, so the problem grows beyond the joint itself. In a London flat, a failed joint rarely stays your problem alone: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs, plus any working-time requirements on site. Ask us for a quote and we’ll explain what it covers.
Why us?
- We leave the area clean and tidy
- Old sealant always removed completely
- A 12-month guarantee on all work
- Over 20 years’ experience
See what affects the cost and customer reviews.
Towns and villages near Whitton
Also in Whitton
Do you need external mastic in Whitton?
Poor preparation causes many early failures: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The sealant never bonds properly.
Look out for these signs:
- Movement joints with cracked, split or missing sealant
- Rigid filler in a joint that should flex
- Failed seals between different materials
- Sealant pulling away from one side of the joint
As a London address, Whitton can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
What to look for in a quote
- The length of the guarantee
- Is the old sealant removed completely?
- Whether you can choose the colour
- What insurance they hold
Common questions in Whitton
Is parking a problem for a job in Whitton?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
I let a flat near Whitton station. Can you help?
Yes. We work for landlords and letting agents as well as homeowners, and several properties can go on one quote. You can ring 0345 464 0079 or email us with the details for a clear quote.
Will you leave a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
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, so the joint can move.
Can you seal over the old sealant?
No. Fresh sealant doesn’t stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Can you match the colour of my brickwork?
The aim is a neat, even joint in a colour that suits the wall. Colour is agreed with you before we begin from the range available.
Will the old sealant be removed?
Yes, every time. New sealant won’t bond properly to old, so the joint is cleaned back first.
Where do you work from?
Mr Mastic is based in Crawley. Our applicators cover Whitton.
Different surfaces, different methods
Brickwork movement joints
Clay brickwork grows slightly over its life and moves with the weather. The movement joint takes that up, so the sealant in it must stay soft and stretchy.
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. The old joint is removed and a sealant that bonds to both sides goes in.
What external mastic looks like in Whitton
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Richmond House (about 1 mile east) nearby, there’s older building stock in the area around Whitton as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
Rented homes near Whitton station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies. Schools such as Royal Military School of Music are buildings too, and its movement joints, gutters and trims need looking after like any other building’s.
Whitton is about 1 mile west of Twickenham, in Greater London. Whitton gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a 12-month guarantee. Across Greater London, we cover 764 places, and Whitton is one of them. For nearby work, see our London page, about 12 miles away.
Postcode districts we cover here for external mastic: TW2, TW1 and TW7. Whether your property is on May Road, Mill Road and Ross Road or anywhere close by, our applicators can take on the job. We also cover Twickenham (1 mile east), Ivybridge (1 mile north-east), Fulwell (1 mile south), Strawberry Hill (1 mile south-east) and Eel Pie Island (1 mile east). Within a short drive, we also cover London (12 miles east), City of Westminster (10 miles north-east), Marylebone (10 miles north-east), Kensington (7 miles north-east), St Pancras (11 miles north-east) and Shoreditch (13 miles north-east).
Landmarks near Whitton
Around Whitton, our work takes us to homes and buildings near The Richmond upon Thames School, Trafalgar Infant School and Crane Park. Whitton has its own railway station: Whitton station. A little further out are Museum of Army Music (under half a mile north) and Treaty Centre (1.4 miles north). The countryside around Whitton includes Garden Lake and Richmond Hill.