East Sussex · England
Birling Gap External Mastic
Professional external mastic in and around Birling Gap, with every bit of old sealant taken out first and a one-year guarantee.
- Joints pointed up with cement by mistake
- Panel joints letting water in
- Cracked joints where brick meets render or frames
Signs you need external mastic in Birling Gap
Sunlight, wet weather and frost wear exterior sealant down. Over the years it hardens, cracks on the surface and loses its give, so the joint eventually tears or comes away from one side.
Any of these means the joints need attention:
- Old sealant gone brittle and cracked
- Sealant pulling away from one side of the joint
- Failed sealant between panels on a façade
- Failed seals between different materials
For landlords with property near Eastbourne station, outside joints that have cracked can let damp into a rental, so check them between lets.
Before booking anyone
- Whether you can choose the colour
- What happens if the job turns out different
- Who turns up on the day
- Whether they’re fully insured
External mastic in Birling Gap
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 where a rigid filler would soon crack. If you’re dealing with old sealant gone brittle and cracked and leaking joints around cladding and façade panels, we can help.
External sealant needs dry, clean surfaces, so work around Birling Gap is planned for dry weather. Tell us about access to all sides of the building, including outbuildings and garages.
Whatever the size of the job, it’s backed by our 12-month guarantee.
- Place
- Birling Gap (BN20)
- Wider area
- East Sussex
- Cover
- One year on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Other services in Birling Gap
Birling Gap buildings and the weather
Birling Gap 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. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
In the older streets around The Parish Church of St Simon and St Jude, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Birling Gap is about 5 miles south-east of Seaford, in East Sussex. For external mastic in and around Birling Gap, please ring 0345 464 0079 or drop us an email for a quick quote. We’re based in Crawley and cover East Sussex. Birling Gap is one of 289 towns and villages in East Sussex where we work for external mastic. For nearby work, see our Brighton page, about 16 miles away.
Work in BN20 works the same way as everywhere else we cover. If you’re just outside Birling Gap, we cover East Dean (1 mile north), Friston (1 mile north), Meads (3 miles east), Holywell (3 miles east) and Old Town (3 miles north-east). Within a short drive, we also cover Eastbourne (5 miles north-east), Bexhill-on-Sea (14 miles north-east), Seaford (5 miles north-west), Lewes (13 miles north-west), Hailsham (9 miles north) and Newhaven (8 miles north-west).
Landmarks near Birling Gap
The nearest railway station is Eastbourne station, roughly 3.9 miles north-east. Nearby you will also find Eastbourne District General Hospital (4.1 miles north-east) and Rnli Eastbourne Lifeboat Museum (3.9 miles east). Green spaces nearby include Combe Hill.
How we quote for external mastic
Call for a quick quote. What matters most is:
- The type of sealant required
- Access and height
- The number of rooms or windows
- Whether old sealant or filler has to be cut out
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we will explain the quote if you ask.
What we need to know
What to tell us when you ask for a quote:
- The problem you’ve noticed
- If someone has resealed it before
- Where the property is
- Pictures of the joints, sent by email
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. Whenever you’re ready, phone 0345 464 0079 or email us.
DIY versus a professional finish
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.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly.
For landlords and businesses
If you manage several properties in or around Birling Gap, several properties can be quoted together. Just tell us the addresses and what each one needs.
In hotels, rooms out of use cost money, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Leave the joints unpainted unless we have said otherwise
- Walk round the building once a year and look at the joints
- Clear growth from the base of walls and joints
- Tell anyone working on the walls about the movement joints
Do not paint over the new sealant unless we’ve said the product is paintable. Many exterior sealants are not designed to be painted and spoil the finish.
A joint that has stopped moving pushes the movement elsewhere, usually as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
How the visit works
Once we are on site, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. Most jobs then take anything from a few hours to several days, depending on the building. In a small place like Birling Gap, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- 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.
How to prepare
- Clear items away from the joints we’re working on
- On commercial sites, let us know about site rules
- Keep pets and children clear of the area while we work
Ask for a quote
We quote each job on its own. Simply phone 0345 464 0079 or drop us an email and describe the job, and pictures are welcome.
Advice
Different surfaces, different methods
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.
Cladding and façade panels
Metal and composite panels move a lot with temperature, so the joints work hard every day. The sealant is chosen with that in mind.
Common questions in Birling Gap
I let a flat near Eastbourne station. Can you help?
Yes. We work for letting agents and landlords as well as homeowners. Just phone 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear quote.
Does the coastal weather in Birling Gap affect outside sealant?
Near the sea, outside joints face more wind, rain and salt than they would inland, so preparation and the right sealant matter all the more. Walls facing the sea are generally the first to need attention.
What is backing rod for?
Backing rod controls the sealant depth and keeps it off the back of the joint. Then the sealant bonds to two faces and can move.
Can I do 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.
Are you an approved applicator?
Yes. We’re an ARBOMaster approved applicator, which is run for the Arbo sealant brand.
Can I add another job to the visit?
Yes. Several rooms, windows or areas can go on one quote.
Will the new joint stand out?
Exterior sealants are made in a range of colours, from greys and browns to whites and stone shades. We pick the one that suits your wall best so the joint does not draw the eye.
How much does external mastic cost in Birling Gap?
We do not publish prices, because the cost depends on the job: its size, the old material, access and the product needed. You will get a clear quote before any work starts.