Greater London · England
External Mastic in Feltham
Specialist external mastic for Feltham: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Sealant that has lost its bond to the brick or render
- Weeds or debris growing in open joints
- Leaking joints around cladding and façade panels
What we can’t put right
Some problems need a builder, plumber or other trade rather than us:
- Structural movement, which needs a surveyor or engineer
- Cracked brickwork or render that needs a builder or plasterer
- Failed render or damaged cladding panels
If you are not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer.
Surfaces we seal
- Brickwork movement joints
- Copings & trims
- Façade panels
- Render & cladding joints
- Joints between brick and frames
- Concrete & block
About our external mastic in Feltham
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible exterior sealant takes up that movement. If you’re dealing with rigid filler in a joint that should flex and rain getting behind render or cladding at a joint, we can put it right.
Modern London flats rely on sealed movement joints and cladding joints. Period houses have different weak points, such as gutter joints, trims and the line where an extension meets the old wall.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Location
- Feltham (TW14, TW13)
- Region
- Greater London
- Cover
- A year, on every job
- Quote
- A clear price before work begins
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Walls and rooflines in Feltham
With historic houses such as Strawberry Hill House (about 3.5 miles east) nearby, there’s older building stock in the area around Feltham as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. In terraces and conversions, gutters and walls are often shared with the neighbours, so check who is responsible for the outside before booking.
As a London address, Feltham can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. Managing a site like St Lawrence Catholic Primary School? Then its movement joints, gutters and trims need looking after like any other building’s.
Feltham is about 6 miles south-west of Ealing, in Greater London. For external mastic in and around Feltham, it’s easy to get a quote: please call 0345 464 0079 or send us an email. We cover Greater London from our Crawley base, Feltham included. Feltham is one of 764 towns and villages in Greater London we cover. Our London page covers work nearby (14 miles or so).
Every address in TW14 and TW13 is covered for external mastic, from the main roads to the quietest streets. We cover properties on High Street, Railway Terrace and Sandycombe Road. With the A244 and B377 close by, Feltham is easy for our applicators to reach for external mastic. Neighbouring places we cover for external mastic include Bedfont (1 mile west), Hounslow (1 mile south-west), Hatton (1 mile north), Ashford Common (2 miles south-west) and Cranford (2 miles north). Larger places within reach include London (14 miles east), City of Westminster (12 miles east), Marylebone (12 miles north-east), Kensington (10 miles east), St Pancras (14 miles north-east) and Shoreditch (15 miles east).
Around Feltham
Around Feltham, our work takes us to homes and buildings near Hounslow Heath, Moon On The Square pub and Rivers Academy West London. Feltham has its own railway station: Feltham station. Other landmarks nearby include Hounslow Hospital (2.3 miles north-east) and Kempton Steam Museum (1.6 miles south). For a walk, there’s Richmond Hill and Pevensey Road Nature Reserve.
DIY sealant or a professional job?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
More services for Feltham
What we do, step by step
Every visit runs the same way: we check the joints, protect the area around them, do the work and clear up. Most jobs take a few hours for a handful of joints, longer for a whole elevation. In Feltham, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- 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.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
How to prepare
- Let us know about stairs, lifts or work at height
- Clear the area around the work
- Tell us about any previous sealing or DIY attempts
Getting a quote
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we will talk you through the work.
Advice
Landlords, agents and businesses in Feltham
If you manage several properties in or around Feltham, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Signs you need external mastic in Feltham
Joints sealed without backing rod, or far too deep, rarely last. If the sealant sticks to the back as well as the sides, it cannot stretch and rips as the joint opens.
The most common problems we see are:
- Movement joints filled with mortar instead of sealant
- Sealant that has lost its bond to the brick or render
- Weeds or debris growing in open joints
- Rain getting behind render or cladding at a joint
Rented homes near Feltham station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Before booking anyone
- Who turns up on the day
- Is VAT in the price?
- Whether all the old sealant comes out first
- Whether you can choose the colour
Why deal with it now?
A failed movement joint lets water into the wall, behind render and cladding. Resealing early keeps the job to the joint itself, instead of the wall and finishes around it. Converted houses in London often have a bathroom above someone else’s living room, and a slow leak from a failed seal can end up in the flat below. Putting it right early is much less trouble for homes in Feltham.
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please call 0345 464 0079 or send us an email.
Why book with us
- Tidy, careful work
- Colour picked to suit the job
- More than 20 years in sealant work
- 12-month guarantee on every job
Read how sealant jobs are priced and our reviews.
What affects the quote in Feltham
You’ll get a clear quote before we start. It takes into account:
- How much old sealant there is and how hard it is to remove
- Which sealant suits the joint
- The number of rooms or windows
- Working hours on commercial sites
Doing several joints on one visit is generally more efficient than separate visits, so it’s worth mentioning everything you’d like done. We’ll give you a clear quote for the lot.
Helping us quote
When you call or email, these details help:
- If it’s domestic, commercial or a hotel
- Access, such as stairs, a lift or height
- How many joints, rooms or windows are involved
- Where the job is, and your postcode
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.
Your questions about external mastic in Feltham
Is parking an issue for external mastic in Feltham?
Parking in Feltham, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
Do you work for landlords with property near Feltham station?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before we start.
Are you ARBOMaster approved?
Yes. We are an ARBOMaster approved applicator, which is run for the Arbo sealant brand.
Do you use backing rod?
Backing rod controls the sealant depth and keeps it off the back of the joint. Then the sealant bonds to two faces and can move.
How long does external mastic last?
It varies with how exposed the wall is and how much the joint moves. Signs to watch for are cracking, hardening and gaps at the edges.
Is it OK to seal over old sealant?
No, because it fails. The old sealant always comes out first.
When is the sealant fully cured?
Different products cure at different speeds, so follow the cure time we give you.
How long does external mastic take?
Most jobs take a few hours for a handful of joints, longer for a whole elevation, including preparation and clearing up. We’ll confirm how long when we quote.