Greater London · England
External Mastic in Romford
External mastic for Romford, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Leaking joints around cladding and façade panels
- Brick movement joints where the sealant has split
- Failed seals between different materials
External mastic for homes and businesses in Romford
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible exterior sealant takes up that movement where mortar or filler would crack. If you are dealing with failed seals between different materials and panel joints letting water in, we can help, on brickwork movement joints, render & cladding joints and copings & trims alike.
In London terraces and converted houses, gutters and walls are often shared with the house next door, so a leaking gutter joint or failed wall joint can affect more than one home. In a converted house in Romford, it’s worth checking who is responsible for the outside before booking.
Every job is covered by our one-year guarantee.
- Where
- Romford (RM1, RM7, RM11, RM2)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
DIY sealant or a professional job?
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
Also in Romford
What affects the quote in Romford
Every job gets its own quote. This is what makes a difference:
- Whether old sealant or filler has to be cut out
- The number of rooms or windows
- Access and height
- Which sealant suits the joint
Combining jobs into one visit is usually more efficient than separate visits, so tell us about everything that needs sealing. You’ll get one clear quote for the whole job.
Helping us quote
To help us quote quickly, please include:
- If it’s domestic, commercial or a hotel
- What the problem is, such as mould, gaps, leaks or cracking
- Any previous sealing or DIY work
- The address or postcode of the job
We do not publish a price list. Instead, we give you a clear price for your job. To arrange one, ring 0345 464 0079 or send us an email.
How the job changes by surface
Cladding and façade panels
Cladding and façade panels are normally separated by sealed joints. We reseal them with a sealant suited to the panel material.
Brickwork movement joints
Brick movement joints are often mistaken for a missing mortar line. Where one has been mortared, we cut it out and reseal it with sealant where it can be done safely.
Honest limits
A few problems are outside what sealant work can do:
- Rising or penetrating damp from elsewhere in the wall
- Structural movement, which needs a surveyor or engineer
- Loose or hollow render, which needs re-rendering
If in doubt, call 0345 464 0079 or send us an email and we’ll say what we think.
What we seal
- Render & cladding joints
- Concrete & block
- Joints between brick and frames
- Façade panels
- Brickwork movement joints
- Copings & trims
How to look after the new joints
A little care helps the new joints last. Our advice:
- Ask before painting over external sealant
- Don’t let climbing plants root in the sealant
- Keep high-pressure jets off the joints
- Never let anyone fill a movement joint with mortar
Keep the joints clear of soil, plants and climbing growth. Damp material against the sealant shortens its life.
A joint that has stopped moving pushes the movement elsewhere, often as cracks near the joint. Catch it early and you reduce the risk.
Questions from Romford
Is Romford in your area for external mastic?
Yes, Romford is within the area we cover. We work across London and the South East. Just phone 0345 464 0079 or drop us an email with a few details of the job.
Can you help a landlord with a rental near Romford station?
Yes, landlords and agents are among the people we work for. Just call 0345 464 0079 or email us with the address and what needs doing, and we’ll send you a clear quote.
Is it messy?
Tidy work is part of the job. We protect what’s around the joints, and the area is left clean when we finish.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done and we will quote it together.
Can a movement joint be filled with mortar?
No, not if it’s a movement joint. Filling it with mortar defeats its purpose and can lead to cracking. A flexible sealant is the right fill.
Should I try DIY first?
It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
Do you seal joints where cladding meets other materials?
Yes. The old joint is removed, both surfaces cleaned and primed where needed, and a flexible sealant applied. We pick a colour that works with both materials.
What colours does the sealant come in?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We pick the one that suits your wall best.
Signs you need external mastic in Romford
Joints sealed without backing rod, or far too deep, rarely last. Sealant bonded to three sides has nowhere to go and rips as the joint opens.
Signs it’s time to call us include:
- Movement joints with cracked, split or missing sealant
- Joints pointed up with cement by mistake
- Damp patches traced to an open external joint
- Failed seals between different materials
For an older house near a landmark such as Parish Church of St Edward the Confessor, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Questions to ask before booking
- How much experience the applicator has
- Whether all the old sealant comes out first
- Whether VAT is included
- How hidden problems are handled
External mastic in Romford: local notes
With historic houses such as Hare Hall (about 1.4 miles north-east) nearby, there’s older building stock in the area around Romford as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. 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.
Romford is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. For landlords with property near Romford station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Romford is about 12 miles west of Basildon, in Greater London. Across the RM1 area, we can carry out external mastic at your property. Romford is one of 764 towns and villages in Greater London where we work. London is on our list too, about 13 miles from Romford.
All of RM1, RM7, RM11 and RM2 is within our area for external mastic. If you need external mastic at a property on High Street, Market Place and Market Link or anywhere close by, our applicators can take on the job. Main roads around Romford include the A1251, which makes travel easy. If you’re just outside Romford, we cover Rush Green (1 mile south-west), Collier Row (1 mile north), Rise Park (1 mile north), Becontree Heath (1 mile south-west) and Chadwell Heath (2 miles west). Within a short drive, we also cover London (13 miles south-west), City of Westminster (15 miles west), Marylebone (15 miles west), St Pancras (13 miles west), Shoreditch (12 miles west) and Walthamstow (9 miles west).
Landmarks near Romford
Typical jobs here are in homes near Lodge Farm Park, Frances Bardsley Academy for Girls and The Moon & Stars pub, among other places. There’s a railway station in Romford itself: Romford station. Nearby you will also find The Brewery (less than half a mile south-west) and Oldchurch Hospital (under half a mile south). The countryside around Romford includes The Chase Nature Reserve.
What we do, step by step
There’s no need to move everything out before we come, only the area right around the joints. We protect the rest, and the job takes a few hours for a handful of joints, longer for a whole elevation for a typical job. In Romford, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- Plan for the work area to be out of bounds to pets and children
- Let us know about earlier repairs to the joints
- Tell us if parking is tricky
How to get 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 before giving you a price.