Brighton and Hove · England
External Mastic in Hollingdean
External mastic for Hollingdean, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Rain getting behind render or cladding at a joint
- Failed sealant between panels on a façade
- Sealant pulling away from one side of the joint
What the job involves on each surface
Concrete and blockwork
Concrete faces can be dusty and porous, so cleaning and priming matter. We prime where the sealant needs it before the bead.
Copings and trims
Metal and stone copings both move with temperature, so the joints need a sealant that stays flexible year round.
How we handle external mastic in Hollingdean
A movement joint is a deliberate break that lets a wall expand and contract. Its sealant has to flex with the building, season after season, and when it fails, the wall takes the strain and water finds a way in. If you have failed seals between different materials and old sealant gone brittle and cracked, we can help, on render & cladding joints, joints between brick and frames and brickwork movement joints alike.
In a smaller place like Hollingdean, some homes face open ground, and walls and rooflines facing the weather take the worst of it. That’s where gutter joints and wall joints tend to fail first.
All our work comes with a one-year guarantee, wherever you are in Brighton and Hove.
- Location
- Hollingdean (BN1, BN2)
- Region
- Brighton and Hove
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Nearby places to Hollingdean
What else we do in Hollingdean
Signs you need external mastic in Hollingdean
Poor preparation causes many early failures: dusty or wet faces, no primer where one was needed, or old sealant left in. The new sealant then lets go long before it should.
If you can see any of these, it’s time to have the joints looked at:
- Joints pointed up with cement by mistake
- Joints where the bead has come unstuck
- Panel joints letting water in
- Damp patches traced to an open external joint
For an older house near a landmark such as St Richard's, an extension built onto an older house moves differently, and the joint between them takes the strain.
What to look for in a quote
- What the cure time is
- What happens if the job turns out different
- How the joint is cleaned and prepared
- Is the old sealant removed completely?
What happens if it’s left?
Mortar or ordinary filler might look like a quick way to close an open joint, but it stops the joint moving. The wall then cracks somewhere else. The correct repair is a flexible sealant with the right backing. In an older home around Hollingdean, damp from a failed joint can get into timber and plaster, and that is a much bigger job than renewing the sealant.
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. You’ll know the price before we begin.
What you get with us
- Fully insured
- Quality sealants from Arbo and Everbuild
- An ARBOMaster approved applicator
- Neat joints and a tidy finish
Read what affects the cost and customer reviews.
Aftercare tips
A little care helps the new joints last. We recommend:
- Have failed joints looked at early
- Check external joints each spring
- Leave the joints unpainted unless we’ve said otherwise
- Keep movement joints as flexible joints, not mortar
Keep the joints clear of soil, plants and climbing growth. Damp material against the sealant shortens its life.
Act while the splits are small. At that stage it’s a simple cut out and reseal.
Questions from Hollingdean
Will you come out to Hollingdean?
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.
Is external mastic in a coastal place like Hollingdean any different?
Near the sea, outside joints face more wind, rain and salt than they would inland, so the choice of sealant and the preparation matter even more. Walls facing the sea are normally the first to need attention.
Should I try DIY first?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
Do you remove the old sealant?
Yes. All of the old material is cut out and the joint cleaned before resealing.
Are you an approved applicator?
Yes. Mr Mastic is an ARBOMaster approved applicator, and we are fully insured.
When is the sealant fully cured?
Most sealants are touch-dry well before they’re fully cured. We’ll tell you how long to leave the joint before we leave.
Are you insured?
Yes. We’re fully insured.
Where are you based?
We’re a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
External mastic in Hollingdean: local notes
Hollingdean 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. Historic houses like Preston Manor & Gardens (about 0.9 miles west) are a reminder that the area around Hollingdean has older buildings as well as new. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
Letting a property close to Moulsecoomb station? Then split movement joints are easy to miss on a rental until damp shows inside. For site and facilities teams at buildings such as Hertford Infant and Nursery School, its movement joints, gutters and trims need looking after like any other building’s.
Hollingdean is about 1 mile north of Brighton, in Brighton and Hove. Jobs in Hollingdean get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Hollingdean is one of 30 places in Brighton and Hove where we work.
Here we cover the BN1 and BN2 postcode area for external mastic. We cover properties on Mayo Road, Dewe Road and Rugby Road. Close by, we work in Brighton (1 mile south), Preston (1 mile west), Moulsecoomb (1 mile east), Prestonville (1 mile south-west) and Hanover (1 mile south). We also work in nearby towns such as Brighton and Hove (3 miles west), Aldrington (3 miles west), Hangleton (3 miles west), Saltdean (5 miles south-east), East Saltdean (5 miles south-east) and Roedean (3 miles south-east). Hollingdean is one of the larger places we cover in Brighton and Hove.
What’s near Hollingdean
In Hollingdean, that means homes and buildings near Varndean School, William Clarke Park and The Pub at Fiveways and the streets around them. The nearest railway station is Moulsecoomb station, roughly 0.5 miles east of the centre. Other landmarks nearby include Brighton General Hospital (1.1 miles south-east) and Clayton Castle (4.6 miles north). Green spaces nearby include Newmarket Hill and Bevendean Down.
The process
The work is kept neat and contained to the area we’re working on. The job usually takes a few hours for a handful of joints, longer for a whole elevation, and we explain the cure time before we leave. Parking around Hollingdean is generally easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- 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.
How to prepare
- Let us know if you’ve seen damp or leaks
- Tell us about access, such as stairs, a lift or high-level joints
- For indoor joints, keep the area dry beforehand if you can
How to get a quote
We quote each job on its own. Just call 0345 464 0079 or drop us an email with the details.
Related advice
What sealant work cannot fix
We’d rather tell you now than do work that will not last, so here’s what sealant can’t put right:
- Movement that is more than a sealant joint can take
- Walls that need new movement joints cut into them
- Loose or hollow render, which needs re-rendering
If you are not sure, just call 0345 464 0079 or drop us an email and we will give you a straight answer before booking.
Surfaces we seal
- Concrete & block
- Façade panels
- Joints between brick and frames
- Render & cladding joints
- Brickwork movement joints
- Copings & trims