East Sussex · England
Magham Down External Mastic
Professional external mastic in and around Magham Down, with old sealant always removed completely and a one-year guarantee.
- Rigid filler in a joint that should flex
- Gaps where render, brick and frames meet
- Old sealant gone brittle and cracked
External mastic in Magham Down
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 where a rigid filler would soon crack. If you’re dealing with leaking joints around cladding and façade panels and rain getting behind render or cladding at a joint, we can put it right.
External sealant needs dry, clean surfaces, so work around Magham Down is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
Every job is covered by our 12-month guarantee, wherever you are in East Sussex.
- Where
- Magham Down (BN27)
- Wider area
- East Sussex
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
FAQs for Magham Down
Do you cover smaller places like Magham Down?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you work for landlords with property near Polegate station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before work begins.
Do you remove the old sealant?
Yes, every time. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
Can you seal over the old sealant?
No. Fresh sealant doesn’t stick to old sealant, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
What is a movement joint?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It should be filled with flexible sealant, never mortar.
Will you leave a mess?
No. We work neatly, protect the area around the joints and tidy up afterwards.
Are you ARBOMaster approved?
Yes. We hold ARBOMaster approved applicator status.
Does someone need to be in?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
What we cannot put right
To be straight with you, some problems need a different trade:
- Movement that is more than a sealant joint can take
- Walls that need new movement joints cut into them
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
If in doubt, call 0345 464 0079 or email us and we will say what we think before booking.
What we seal
- Brickwork movement joints
- Render & cladding joints
- Concrete & block
- Joints between brick and frames
- Copings & trims
- Façade panels
What affects the cost of external mastic
For a quick quote, just ask. What matters most is:
- How many areas need sealing
- The product the joint needs
- When we can work, for business premises
- Mould in or behind the old joints
The cost depends on how much there is to do, how much old material has to come out and access to the work. You’ll have a clear quote before any work starts, so you know where you stand.
Asking for a quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- How many joints, rooms or windows are involved
- Pictures of the joints, sent by email
- The problem you’ve noticed
- Access, such as stairs, a lift or height
If you’re in Magham Down and need external mastic, call 0345 464 0079 or drop us an email. Tell us what the problem is and where, and you will get a clear quote before any work starts.
What external mastic looks like in Magham Down
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Horselunges Manor (about 1.7 miles west) nearby, there’s older building stock in the area around Magham Down as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
If you let a flat or house near Polegate station, split movement joints are easy to miss on a rental until damp shows inside. Managing a site like Hailsham Community College? Then larger buildings have long runs of movement joint that eventually need resealing.
Magham Down is about 2 miles north-east of Hailsham, in East Sussex. We carry out external mastic for homes and businesses in Magham Down and the surrounding area. 289 places in East Sussex are on our list, large and small. We also work in Brighton, around 18 miles away.
Jobs for external mastic in BN27 works the same way as everywhere else we cover. Whether your property is on Old Road and Nodes Lane or a nearby road, we can help. Close by, we work in Hellingly (1 mile west), Upper Horsebridge (1 mile west), Hailsham (2 miles south-west), Lower Horsebridge (2 miles west) and Tile Hurst (2 miles west). Further out, we also cover Eastbourne (7 miles south), Hastings (12 miles east), Bexhill-on-Sea (8 miles east), Seaford (11 miles south-west), Lewes (12 miles west) and Crowborough (13 miles north-west).
Around Magham Down
For rail, the closest station is Polegate station, about 4.5 miles south-west. Other landmarks nearby include Amberstone Hospital (0.5 miles west) and Herstmonceux Castle (2.4 miles east).
Nearby places to Magham Down
What else we do in Magham Down
DIY sealant or a professional job?
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
What we are called out for in Magham Down
Sometimes a movement joint was filled with mortar or a rigid filler by mistake. The joint cannot move, so the wall cracks somewhere else instead.
Any of these means the joints need attention:
- Movement joints with cracked, split or missing sealant
- Sealant that has lost its bond to the brick or render
- Plants rooting in failed movement joints
- Failed seals between different materials
Horselunges Manor, about 1.7 miles west, is one of the historic houses in the wider area around Magham Down, and older homes nearby need a sealant that suits their walls.
Questions to ask before you book
- Whether the sealant suits the joint
- Which colour the sealant will be
- What happens if the job turns out different
- How the surfaces are prepared before sealing
What happens if it’s left?
Done well, a resealed joint is a neat, straight line that suits the wall. A rushed bead with no backing looks untidy and doesn’t last, so it pays to do it properly once. Where a wall is exposed, as many are in small places like Magham Down, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Combining jobs into one visit normally makes better use of the time than several visits. You’ll get one clear quote for the whole job.
Why us?
- We agree the colour with you first
- Fully insured
- Over 20 years’ experience
- Anti-fungal sanitary silicone in wet areas
Take a look at what affects the cost and our reviews.
How the job changes by surface
Cladding and façade panels
Panel systems often rely on sealant between and around the panels. We reseal them with a sealant suited to the panel material.
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. They’re resealed over backing rod with a low-modulus sealant.
The process
On the day, we start by going over the job with you, so there are no surprises. We protect the surfaces around the joints before any work begins. The work usually takes a few hours for a handful of joints, longer for a whole elevation. In a small place like Magham Down, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- 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.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Getting ready for the visit
- Let us know about earlier repairs to the joints
- Clear the area around the work
- Mention any sign-in or site rules at work premises
Getting a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. Whenever you’re ready, ring 0345 464 0079 or email us.