East Sussex · England
Seaford External Mastic
Movement joints in Seaford need attention? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Movement joints with cracked, split or missing sealant
- Water getting into walls through failed joints
- Movement joints filled with mortar instead of sealant
The process
There’s no need to move everything out before we come, just the space around the work. We protect the rest, and the job takes anything from a few hours to several days, depending on the building in most cases. Parking in a town like Seaford is normally straightforward, but tell us if there’s a driveway or any restrictions, and let us know if the work is upstairs, in a flat or up high outside.
- 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.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Preparing for the visit
- Keep children and pets away from the work area
- Try not to wet indoor joints just before the visit
- Tell us if parking is tricky
Ask for a quote
For external mastic in Seaford, call 0345 464 0079 or email us. Tell us what the problem is and where, and you will get a clear quote before any work starts.
Related advice
External mastic in Seaford
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible sealant bridges the two. We work on façade panels, joints between brick and frames and brickwork movement joints, and the jobs we see most are moss and dirt in joints with no sealant left and joints pointed up with cement by mistake.
Around Seaford, outside jobs take in garage door frames, porches, gutters and trims as well as walls. Each joint between different materials moves in its own way, so the sealant has to cope with that.
All of our work is guaranteed for twelve months, in Seaford and everywhere else we cover.
- Place
- Seaford (BN25)
- Wider area
- East Sussex
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Nearby places to Seaford
More services for Seaford
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. Our tips:
- Check external joints each spring
- Ask before painting over external sealant
- Show decorators and builders where the movement joints are
- Keep water from gutters off the wall
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.
Leaks behind façade panels and render often go unseen. By the time there’s a damp patch, the damage can be well established, so it’s worth resealing at the first signs.
Walls and rooflines in Seaford
Seaford is close to 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. 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.
Schools such as Seaford Primary School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s. If you let a flat or house near Seaford station, split movement joints are easy to miss on a rental until damp shows inside.
Seaford is about 8 miles west of Eastbourne, in East Sussex. Anywhere in BN25, we cover external mastic for homes and businesses. Our area takes in 289 places across East Sussex, large and small. You can also see our page for Brighton, about 11 miles away.
Work in BN25 works the same way as everywhere else we cover. Local streets include High Street, Station Road and East Albany Road, and we cover them all. You’ll find Seaford on the A259, so it’s easy for us to get to with everything needed for external mastic. Neighbouring places we cover for external mastic include Bishopstone (1 mile north-west), Norton (2 miles north-west), Tide Mills (2 miles west), Westdean (2 miles east) and Dukes Green (3 miles north-east). Within a short drive, we also cover Eastbourne (8 miles east), Lewes (8 miles north-west), Hailsham (9 miles north-east), Uckfield (13 miles north), Newhaven (3 miles north-west) and Peacehaven (5 miles west). Being one of East Sussex’s larger places, Seaford has every kind of property, from flats to offices.
Landmarks near Seaford
We work in homes and buildings around St Peter's School, Seaford Head School and Seven Sisters pub. Seaford’s nearest station is Seaford station, about 0.5 miles south-west. A little further out are Newhaven Museum (2.9 miles north-west) and Arlington Castle (3.7 miles north-east). Open spaces near Seaford include Firle Beacon.
Common problems we fix in Seaford
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.
These are the problems we are asked about most:
- Sealant that has lost its bond to the brick or render
- Gaps where render, brick and frames meet
- Hard, crazed mastic that has stopped moving
- Panel joints letting water in
For an older house near a landmark such as Church of St Thomas More, an extension built onto an older house moves differently, and the joint between them takes the strain.
What to look for in a quote
- How long the guarantee is
- Is the old sealant removed completely?
- How the joint is cleaned and prepared
- Which colour the sealant will be
Surface by surface
Render joints
Rendered walls have joints at beads, openings and changes of material. We reseal them with a flexible exterior sealant that suits the render colour.
Copings and trims
Metal and stone copings both move with temperature, so the joints need a sealant that stays flexible in all weathers.
Landlord and commercial work in Seaford
If you manage several properties in or around Seaford, jobs at different addresses can go on one quote. Send us the addresses and the work at each, and photos by email help.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements.
Seaford questions
Can you do external mastic in Seaford?
Yes, Seaford is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear price.
Do you work for landlords with property near Seaford station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just ring 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear price.
Do you work at height?
That depends on how high the joints are and the ground below. Low-level joints are straightforward; for higher work, tell us about the building and we’ll confirm what’s needed.
Can I do it myself?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Will there be a smell?
That depends on the sealant. Some smell for a while, some hardly at all.
Are you ARBOMaster approved?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Where are you based?
We’re based in Crawley, and we cover South East England, London and all of Scotland.
Is it messy?
No. We protect the surfaces around the joints, and we tidy up before we go.
Should I try it myself first?
A DIY attempt doesn’t rule out a professional job. We cut it out and start again.
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 fails, we can still redo it.
When something else is needed
To be straight with you, there are a few things sealant will not fix:
- Cracked brickwork or render that needs a builder or plasterer
- Adding movement joints to masonry that has none
- Movement that is more than a sealant joint can take
If you are not sure, just ring 0345 464 0079 or drop us an email and we will give you a straight answer.
Surfaces we seal
- Copings & trims
- Brickwork movement joints
- Façade panels
- Joints between brick and frames
- Concrete & block
- Render & cladding joints