East Sussex · England
External Mastic in Selmeston
Our applicators work in Selmeston on sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly.
- Movement joints with cracked, split or missing sealant
- Hard, crazed mastic that has stopped moving
- Failed sealant between panels on a façade
External mastic for homes and businesses in Selmeston
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible sealant bridges the two. We’re often asked to deal with leaking joints around cladding and façade panels and sealant that has lost its bond to the brick or render, across render & cladding joints, brickwork movement joints and façade panels.
Older homes in small places like Selmeston may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water generally gets in.
There’s a 12-month guarantee on every job, whatever its size.
- Where
- Selmeston (BN26)
- Region
- East Sussex
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What we do, step by step
At the end, we look at the finished work together. The visit itself normally takes anything from a few hours to several days, depending on the building, depending on the size of the job. Somewhere like Selmeston needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- 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.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Getting ready for the visit
- Let us know if you’ve seen damp or leaks
- Clear the area around the work
- Tell us about access, such as stairs, a lift or high-level joints
Ask for a quote
Getting a quote is simple: let us know the job and the location. Photos by email help us understand the job, and we will come back to you with a quote.
Read more
Other services in Selmeston
Why deal with it now?
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That matters on brick, render and concrete, which can be weaker at the face. Too stiff a sealant can pull at the edges and break them. Where a wall is exposed, as many are in small places like Selmeston, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
We do not show prices on the website, because each job is priced on what it involves. Call for a quick quote.
Why Selmeston clients choose us
- Rated 4.9 stars on Google
- Sanitary silicone with an anti-fungal additive in wet areas
- Sealant colour chosen to suit
- White, clear, grey or another colour, product permitting
See what affects the cost and customer reviews.
What we are called out for in Selmeston
Buildings move more than people expect. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. The sealant in the movement joints takes that strain.
It’s worth asking for a quote if you see:
- Weathered mastic that no longer stretches
- Rain getting behind render or cladding at a joint
- Movement joints with cracked, split or missing sealant
- Panel joints letting water in
Homes close to The Parish Church of St Mary include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Questions to ask before you book
- Which colour the sealant will be
- How hidden problems are handled
- When the joint can take water or movement
- What product goes in the joint
Your questions about external mastic in Selmeston
Can you help a landlord with a rental near Berwick (Sussex) station?
Yes, we work for letting agents and landlords. Just ring 0345 464 0079 or send us an email and tell us about the property, and we will give you a clear quote.
Is Selmeston within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
How long will you be here?
That depends on the amount of work, but as a guide it takes anything from a few hours to several days, depending on the building. We will give you a better idea when we quote.
Do you seal joints where cladding meets other materials?
Yes. Where different materials meet is one of the most common joints we seal. The sealant is chosen to bond to both sides.
Will the old sealant be removed?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Are you an approved applicator?
Yes. We’re approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
Is there any odour?
Possibly a little. It fades as the sealant cures.
Does someone need to be in?
It depends on the job. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
Work for landlords, hotels and businesses
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Hotels need rooms back in use, so we plan the work room by room. We’ve worked in hotels as well as homes and businesses.
Can I do it myself?
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so just mention it when you contact us.
Aftercare tips
Good habits help new joints last longer. A few tips:
- Never let anyone fill a movement joint with mortar
- Check the sealant is paintable before painting near it
- Deal with leaking gutters that soak the joints below
- Don’t let climbing plants root in the sealant
Keep the joints clear of soil, plants and climbing growth. Anything that holds water against the joint wears it out sooner.
If you can see gaps, plants or bare sections in a joint, have it checked. Early work is quicker and leaves a better finish.
Selmeston buildings and the weather
Historic houses like Charleston Farmhouse (about 1.2 miles west) are a reminder that the area around Selmeston has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. 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.
Rented homes near Berwick (Sussex) station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Selmeston is about 5 miles north of Seaford, in East Sussex. Wherever you are in the BN26 postcode area, we cover external mastic for homes and businesses. Across East Sussex, we cover 289 places, Selmeston among them. Our Brighton page covers work nearby (12 miles or so).
Every address in BN26 is within our area for external mastic, from the main roads to the quietest streets. Streets in the area include The Street and Lewes Road, all of which we cover. We also cover the places around Selmeston: Alciston (1 mile south), Berwick (1 mile east), Ripe (2 miles north), Winton (2 miles south) and Wickstreet (2 miles north-east). Larger places within reach include Eastbourne (7 miles south-east), Bexhill-on-Sea (14 miles east), Seaford (5 miles south), Lewes (6 miles west), Hailsham (5 miles east) and Crowborough (14 miles north).
Landmarks near Selmeston
Locally, jobs take us to homes and businesses close to The Barley Mow pub and the streets around them. For rail, the closest station is Berwick (Sussex) station, roughly 1 mile east of the centre. Well-known places in the area include Drusillas Museum (1.8 miles south-east) and Chailey Heritage Marine Hospital (5.3 miles south-west). The countryside around Selmeston includes Firle Beacon.
What the job involves on each surface
Joints between dissimilar materials
Each side of the joint may need its own preparation. Both surfaces are cleaned and primed as the product requires.
Render joints
Rendered walls have joints at beads, openings and changes of material. They’re resealed in a sealant that suits the render.