East Sussex · England
External Mastic in Alciston
External mastic across Alciston and nearby, with old sealant always removed completely and a 12-month guarantee.
- Sealant pulling away from one side of the joint
- Movement joints filled with mortar instead of sealant
- Hard, crazed mastic that has stopped moving
About our external mastic in Alciston
Failed sealant is cut out, the depth set with closed-cell backing rod, and the joint resealed with a low-modulus sealant made for outside. The colour is chosen to suit the brick or render so the line blends in. We work on façade panels, joints between brick and frames and brickwork movement joints, and people most often call us about movement joints filled with mortar instead of sealant and rain getting behind render or cladding at a joint.
Somewhere as small as Alciston, homes and farm buildings often face open ground, so walls and rooflines take the full force of wind and rain. Joints on those walls need a sealant that moves with the building and stays in place.
A one-year guarantee comes as standard.
- Location
- Alciston (BN26)
- Wider area
- East Sussex
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
When something else is needed
It helps to know what we can’t do:
- Render that is blown, hollow or coming away
- Adding movement joints to masonry that has none
- Damp that isn’t coming from the joint
If you are not sure, just phone 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Joints and surfaces we work on
- Façade panels
- Brickwork movement joints
- Concrete & block
- Copings & trims
- Render & cladding joints
- Joints between brick and frames
Leave it or put it right?
Water gets in through a failed movement joint and can run behind render or cladding. Dealing with it early keeps the repair to the joint, rather than the wall around it. Older cottages and farmhouses around Alciston can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
The cost reflects the work involved, not guesswork. That is why we ask a few questions first.
Why us?
- Neat joints and a tidy finish
- 20+ years of sealant experience
- Approved under the ARBOMaster scheme
- Anti-fungal sanitary silicone in wet areas
Take a look at how sealant jobs are priced and our reviews.
Nearby places to Alciston
Other services in Alciston
Looking after it afterwards
So the new joints stay in good condition:
- Keep movement joints as flexible joints, not mortar
- Get split or bare joints resealed while the damage is small
- Look over the joints every year, ideally after winter
- Deal with leaking gutters that soak the joints below
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.
Water getting behind cladding or render can go unnoticed for a long time. When it finally shows inside, the joint may have been open for years, so it’s worth resealing at the first signs.
Different surfaces, different methods
Concrete and blockwork
The face of concrete or block is often dusty, so preparation is key. A primer goes on where the product requires one before sealing.
Copings and trims
Metal and stone copings both move with temperature, so a flexible sealant suits them best in all weathers.
Alciston buildings and the weather
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. Historic houses like Charleston Farmhouse (about 1.3 miles north-west) are a reminder that the area around Alciston has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
For an older house near a landmark such as The Parish Church, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Alciston is about 4 miles north of Seaford, in East Sussex. Anywhere in BN26, we can carry out external mastic at your property. Our East Sussex coverage runs to 289 places, and Alciston is one of them. You can also see our page for Brighton, roughly 12 miles from Alciston.
Our applicators cover all of BN26 for external mastic. Close by, we work in Selmeston (1 mile north), Berwick (1 mile north-east), Winton (1 mile south-east), Alfriston (2 miles south-east) and Milton Street (2 miles south-east). Within a short drive, we also cover Eastbourne (7 miles south-east), Bexhill-on-Sea (14 miles east), Seaford (4 miles south), Lewes (7 miles north-west), Hailsham (6 miles north-east) and Crowborough (15 miles north).
Landmarks near Alciston
Locally, jobs take us to homes and businesses close to Rose Cottage Inn. The closest station to Alciston is Berwick (Sussex) station, roughly 1.3 miles north-east of the centre. A little further out are Arlington Castle (1.7 miles south-east) and Chailey Heritage Marine Hospital (4.6 miles south-west). Open spaces near Alciston include Firle Beacon.
What we do, step by step
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The work itself takes anything from a few hours to several days, depending on the building. For a village or hamlet like Alciston, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Before we arrive
- For indoor joints, keep the area dry beforehand if you can
- Let us know about stairs, lifts or work at height
- Tell us about any water getting in
Getting a quote
If you’re in Alciston and need external mastic, 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 work begins.
Read more
Common problems we fix in Alciston
Joints sealed without backing rod, or far too deep, rarely last. If the sealant sticks to the back as well as the sides, it can’t stretch and tears as soon as the joint widens.
Keep an eye out for these signs:
- Joints pointed up with cement by mistake
- Gaps where render, brick and frames meet
- Panel joints letting water in
- Joints with sealant missing in places
For landlords with property near Berwick (Sussex) station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
What to look for in a quote
- Who turns up on the day
- What guarantee comes with the work
- Is VAT in the price?
- Which sealant they’ll use, and why
Questions from Alciston
Do you work for landlords with property near Berwick (Sussex) station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can call 0345 464 0079 or email us with the details for a clear quote.
Is Alciston in your area for external mastic?
Yes. We work across London and the South East, and Alciston is part of that. You can phone 0345 464 0079 or email us and tell us what needs doing, and we’ll send you a clear quote.
Is it worth trying it myself?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
Is there a guarantee?
Yes. All our work carries our 12-month guarantee.
How long before the joint can be used?
That depends on the sealant used, so please follow the time we give you when we finish.
What should I tell you?
Just the basics: the address or postcode, what’s wrong and any access issues. After that, simply phone 0345 464 0079 or email us.
Will the new joint stand out?
The aim is a neat, even joint in a colour that suits the wall. We’ll talk through colour options before work begins from the range available.
Can you work on commercial sites?
Yes. Larger jobs can be planned room by room or area by area to suit the site.
Landlord and commercial work in Alciston
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. Several properties can be quoted together.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.