Brighton and Hove · England
Brunswick External Mastic
Specialist external mastic for Brunswick: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Brick movement joints where the sealant has split
- Joints where the bead has come unstuck
- Joints pointed up with cement by mistake
External mastic in Brunswick, done properly
External mastic is a job where short cuts show quickly. New sealant over old, joints packed with mortar and beads with no backing all tend to fail early. We take the old material out and do it properly. If you are dealing with sealant that has lost its bond to the brick or render and hard, crazed mastic that has stopped moving, we can help, on façade panels, joints between brick and frames and brickwork movement joints alike.
Outbuildings, garages and conservatories around homes in places like Brunswick add more joints to look after. Leaks generally start at a gutter end, a garage door frame or where an extension meets the house.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Location
- Brunswick (BN1, BN3, BN50)
- Wider area
- Brighton and Hove
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Landlords, agents and businesses in Brunswick
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
Can I do it myself?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
What happens on the day
At the end, we look at the finished work together and explain the cure time. The visit itself usually takes anything from a few hours to several days, depending on the building, depending on the size of the job. Parking around Brunswick is normally easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- 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.
- The faces are brushed clean and primed where the product requires 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
- For indoor joints, keep the area dry beforehand if you can
- Clear items away from the joints we are working on
- For business premises, tell us about site rules or sign-in
Ask for a quote
Asking for a quote is easy: tell us what needs doing and where, and roughly how big it is. Photos by email help us understand the job, and we will take it from there.
Advice
FAQs for Brunswick
Is external mastic in a coastal place like Brunswick any different?
Near the sea, outside joints face more wind, rain and salt than they would inland, so the choice of sealant and the preparation matter even more. Walls facing the sea are normally the first to need attention.
Do you work for landlords with property near Brighton station?
Yes, we work for letting agents and landlords. You can phone 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before any work starts.
Can I add another job to the visit?
Yes. Just list everything you need and you’ll get one quote.
How do you reach high-level joints?
It depends on the building. Tell us the height, the number of joints and what’s below them and we’ll confirm how they can be reached safely.
What is a movement joint?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It’s sealed with a flexible sealant, not mortar.
How do I get a quote for external mastic in Brunswick?
Size, access and the old material all affect the cost. Ask us for a quote.
Will there be a smell?
Some sealants have a smell while they cure, which fades as it sets. Opening a window helps.
Is it worth trying it myself?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Looking after it afterwards
So the new joints stay in good condition:
- Get split or bare joints resealed while the damage is small
- Wash walls gently around the sealant
- Keep movement joints as flexible joints, not mortar
- Clear growth from the base of walls and joints
Give the sealant the cure time we tell you before anything rubs against it. Most exterior sealants skin fast but take longer to cure right through.
Leave a failed movement joint and water keeps getting into the wall. That can lead to damp patches, staining and frost damage which cost more to put right than the joint.
What affects the cost of external mastic
Your quote is based on your job. We look at:
- When we can work, for business premises
- How much old sealant there is and how hard it is to remove
- The number of rooms or windows
- Which sealant suits the joint
Leaving a failed joint normally makes the job bigger, not smaller, as water and mould keep getting in. If you are unsure, phone 0345 464 0079 or send us an email for an honest opinion and a quote.
What we need to know
When you contact us, it’s useful to know:
- A few photos by email, if you can
- Where the job is, and your postcode
- If it’s domestic, commercial or a hotel
- Whether it has been sealed before
For external mastic in Brunswick, ring 0345 464 0079 or drop us an email. Tell us what the problem is and where, and you will get a clear quote before we start.
What the job involves on each surface
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. We cut out the old sealant and reseal with a product suited to both surfaces.
Copings and trims
Joints in copings, parapets and trims are exposed to the worst of the weather. Each is resealed with a weatherproof, flexible sealant.
External mastic in Brunswick: local notes
Brunswick is within about 1 mile of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on movement joints and outside wall joints, especially on the side facing the sea. Historic houses like Royal Pavilion (about 0.7 miles east) are a reminder that the area around Brunswick has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
Rented homes near Brighton station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets. Homes close to St Stephen's Church include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain. Managing a site like St Mary Magdalen Catholic Primary School? Then its movement joints, gutters and trims need looking after like any other building’s.
Brunswick is about 1 mile south-west of Brighton, in Brighton and Hove. Whether you’re in the middle of Brunswick or further out, we cover external mastic for every kind of property. We cover 30 towns and villages across Brighton and Hove, large and small.
Jobs for external mastic in BN1, BN3 and BN50 works the same way as everywhere else we cover. External mastic is available to properties on Farm Road, York Road and Powis Road and the roads around them. We also cover the places around Brunswick: Seven Dials (1 mile north-east), West Hill (1 mile north-east), Prestonville (1 mile north), Hove (1 mile north-west) and Carlton Hill (1 mile east). Larger places within reach include Hangleton (3 miles north-west), Patcham (3 miles north), Hollingbury (3 miles north), Bevendean (3 miles north-east), Saltdean (5 miles east) and East Saltdean (6 miles east). Being one of Brighton and Hove’s larger places, Brunswick has every kind of property, from flats to offices.
What’s near Brunswick
Locally, jobs take us to homes and businesses close to St. Ann's Well Gardens, Maris & Otter pub and The Drive Prep School. Brunswick’s nearest station is Brighton station, roughly 0.6 miles north-east of the centre. A little further out are Old Police Cells Museum (0.7 miles south-east) and Churchill Square (under half a mile east). The countryside around Brunswick includes Whitehawk Hill and Newmarket Hill.
What we can’t put right
In fairness, there are a few things sealant will not fix:
- Movement that is more than a sealant joint can take
- Rising or penetrating damp from elsewhere in the wall
- Walls that need new movement joints cut into them
If you are not sure, just phone 0345 464 0079 or email us and we will give you a straight answer before you book.
Surfaces we seal
- Concrete & block
- Brickwork movement joints
- Copings & trims
- Joints between brick and frames
- Render & cladding joints
- Façade panels