East Sussex · England
External & façade joints in Holywell, East Sussex
External mastic for Holywell, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Plants rooting in failed movement joints
- Water getting into walls through failed joints
- Sealant pulling away from one side of the joint
About our external mastic in Holywell
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. Common call-outs are for panel joints letting water in and joints where the bead has come unstuck, across joints between brick and frames, façade panels and render & cladding joints.
Houses in smaller places like Holywell can stand more in the open than those in a built-up town, so exposed walls and rooflines take more wind-driven rain. That is where gutter joints and wall joints tend to fail first.
The work is covered for a year after we finish. If there’s a problem with it, please call 0345 464 0079 or send us an email.
- Location
- Holywell (BN20, BN21)
- Wider area
- East Sussex
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
DIY sealant or a professional job?
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
How we quote for external mastic
Some jobs are bigger than they look, and some smaller. The main factors:
- How many areas need sealing
- How easy the joints are to reach
- Which sealant suits the joint
- Mould in or behind the old joints
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs. Ask us for a quote and we will explain what it covers.
Asking for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- The rough size of the job
- Where the job is, and your postcode
- Photos by email, if that is easy
- If someone has resealed it before
Need a quote? Please call 0345 464 0079 or send us an email with a few details. You will know what we plan to do, and what it will cost, before any work begins.
External mastic in Holywell: local notes
Holywell is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you live in an older home near St John the Evangelist, old and new materials meet at the roofline and walls, which is where sealant earns its keep. Schools such as St John's Meads Church of England Primary School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s.
Holywell is about 2 miles south of Eastbourne, in East Sussex. Whether you are in the middle of Holywell or further out, external mastic is available for homes and businesses alike. Holywell is one of 289 towns and villages in East Sussex we cover. For nearby work, see our Brighton page (18 miles or so).
We work across the BN20 and BN21 postcode area for external mastic. That includes homes and businesses on Mount Road, Cliff Road and Denton Road. If you’re just outside Holywell, we cover Meads (1 mile north-west), Old Town (1 mile north), Upperton (1 mile north), Eastbourne (2 miles north) and Ratton Village (3 miles north). We also work in nearby towns such as Hastings (15 miles north-east), Bexhill-on-Sea (11 miles north-east), Seaford (7 miles west), Lewes (14 miles north-west), Hailsham (8 miles north) and St Leonards (14 miles north-east).
Near you in Holywell
We work in homes and buildings around Gildredge House, Roedean Moira House and Gildrege Park and the streets around them. The closest station to Holywell is Eastbourne station, about 1.2 miles north of the centre. A little further out are Eastbourne District General Hospital (2.3 miles north) and Rnli Eastbourne Lifeboat Museum (0.8 miles north-east). Open spaces near Holywell include Combe Hill.
Keeping the joints in good condition
A little care helps the new joints last. We recommend:
- Walk round the building once a year and look at the joints
- Keep high-pressure jets off the joints
- Show decorators and builders where the movement joints are
- Keep movement joints as flexible joints, not mortar
Do not let soil, plants or ivy build up against the new joints. Damp material against the sealant shortens its life.
Leaks behind façade panels and render often go unseen. By the time there’s a damp patch, the damage can be well established.
When it is not the sealant
Some problems need a builder, plumber or other trade rather than us:
- Walls that need new movement joints cut into them
- Cracking across the wall rather than at a joint
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
If in doubt, call 0345 464 0079 or drop us an email and we’ll say what we think before you book.
What we seal
- Façade panels
- Brickwork movement joints
- Concrete & block
- Copings & trims
- Joints between brick and frames
- Render & cladding joints
Different surfaces, different methods
Brickwork movement joints
People sometimes point up a brick movement joint by mistake. Where one has been mortared, we cut it out and reseal it with sealant.
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. The old joint is removed and a sealant that bonds to both sides goes in.
Common questions in Holywell
Can you help a landlord with a rental near Eastbourne station?
Yes. We work for landlords and agents as well as homeowners. You can phone 0345 464 0079 or email us with the details for a clear quote.
Does living near the coast affect external mastic in Holywell?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
What’s an expansion joint in brickwork?
Most straight vertical gaps in brickwork are movement joints. It lets the bricks expand without cracking, and it should be sealed with a flexible sealant.
Should I point up the gap in my brickwork?
No, not where the gap is a movement joint. Pointing it stops it working. A flexible sealant is the right fill.
Does someone need to be in?
If the work is inside, we need someone to let us in. Once we’ve agreed the job, you do not need to watch us work.
Why do you put foam in the joint first?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. That way it bonds to the two sides only and can stretch.
Do you work in Holywell?
Yes. From our base in Crawley, we cover South East England, London and all of Scotland.
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.
Common problems we fix in Holywell
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, so it pulls away from the edges.
The most common problems we see are:
- Joints with sealant missing in places
- Joints where the bead has come unstuck
- Failed seals between different materials
- Panel joints letting water in
If you let a flat or house near Eastbourne station, outside joints that have cracked can let damp into a rental, so check them between lets.
Comparing quotes
- Whether VAT is included
- Whether the sealant suits the joint
- Whether they’re fully insured
- Which colour the sealant will be
Places near Holywell
More services for Holywell
The process
When we get to you, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. After that, the work takes a few hours to a few days, depending on the length of joint and the access. A visit to Holywell is planned like any other: the time, the access and where to park are agreed in advance. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We look at every joint and agree a colour to suit the wall.
- 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
- Tell us if parking is tricky
- Let us know about earlier repairs to the joints
- On commercial sites, let us know about site rules
Getting a quote
To get a quote, phone 0345 464 0079 or send us an email with the location and a short description of the problem. We will give you a clear price before any work starts.