East Sussex · England
External Mastic in Beckley Furnace
Problem with your movement joints in Beckley Furnace? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Old sealant gone brittle and cracked
- Movement joints filled with mortar instead of sealant
- Gaps where render, brick and frames meet
External mastic for homes and businesses in Beckley Furnace
Short cuts in external joints show up within a season or two. Overfilled joints, missing backing rod and sealant laid over old sealant rarely last long. We take the old material out and do it properly. If you have rigid filler in a joint that should flex and gaps where render, brick and frames meet, we can put it right.
External sealant needs dry, clean surfaces, so work around Beckley Furnace is planned for dry weather. Tell us about access to all sides of the building, including outbuildings and garages.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Location
- Beckley Furnace (TN31)
- Region
- East Sussex
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
DIY versus a professional finish
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
When it isn’t the sealant
In fairness, some problems need a different trade:
- Rising or penetrating damp from elsewhere in the wall
- Structural movement, which needs a surveyor or engineer
- Cutting new joints into brickwork, which is building work rather than sealant work
If you’re not sure, just call 0345 464 0079 or send us an email and we will give you a straight answer before booking.
What we seal
- Copings & trims
- Façade panels
- Concrete & block
- Joints between brick and frames
- Render & cladding joints
- Brickwork movement joints
More services for Beckley Furnace
Aftercare tips
Looking after new joints is easy, and it makes a real difference:
- Keep soil, plants and ivy away from the joints
- Avoid pressure-washing directly into sealant joints
- Ask before painting over external sealant
- Never let anyone fill a movement joint with mortar
Don’t paint over the new sealant unless we’ve said the product is paintable. Paint can crack on a flexible joint, and paint can crack as the joint moves.
Act while the splits are small. At that stage it’s a simple cut out and reseal with no damage behind it to deal with.
Quotes for external mastic in Beckley Furnace
There’s no set price list, because no two jobs are the same. The quote depends on:
- Working hours on commercial sites
- Access and height
- The old material and how stubborn it is
- How much there is to do
We do not show prices on the website, because each job is priced on what it involves. For a quick quote, please call 0345 464 0079 or send us an email and we’ll talk you through it.
What we need to know
When you call or email, these details help:
- How many joints, rooms or windows are involved
- Access, such as stairs, a lift or height
- Where the job is, and your postcode
- The problem you’ve noticed
To get a quote, phone 0345 464 0079 or drop us an email with the location and a short description of the problem. We will give you a clear quote before any work starts.
How the job changes by surface
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. Their movement joints are sealed over backing rod with a flexible sealant.
Joints between dissimilar materials
Different materials may need different primers. Both surfaces are cleaned and primed as the product requires.
Beckley Furnace questions
Will you come out to Beckley Furnace?
Yes, Beckley Furnace is covered. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Can you do external mastic in Beckley Furnace?
Yes, Beckley Furnace is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or email us and tell us what needs doing, and we will send you a clear quote.
Will you leave a mess?
Tidy work is part of the job. We protect what’s around the joints, and we clear up when we’re done.
How long does external mastic last?
It depends on the exposure, the movement and the product. Sealant is a maintenance item, so check the joints once a year and reseal when it splits.
Do you guarantee your work?
Yes, always. There’s a 12-month guarantee on every job, large or small.
What do you put in the joint?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
Where is Mr Mastic based?
We’re based in Crawley, and we work across South East England, London and Scotland.
Can you quote for more than one area?
Yes, and it often makes sense. Combining jobs makes good use of the visit.
When to call us in Beckley Furnace
A lot of failed joints come down to preparation: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The sealant never bonds properly.
If you can see any of these, it’s time to have the joints looked at:
- Joints where the bead has come unstuck
- Plants rooting in failed movement joints
- Old sealant gone brittle and cracked
- Brick movement joints where the sealant has split
If you look after a building such as Brede Primary School, larger buildings have long runs of movement joint that eventually need resealing.
Questions to ask before booking
- How the colour is chosen
- What preparation is included
- How long to leave it before use
- Is the old sealant removed completely?
What happens on the day
When we get to you, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. Most jobs then take a few hours to a few days, depending on the length of joint and the access. For a village or hamlet like Beckley Furnace, the journey is planned in advance: 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.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Before we arrive
- Clear items away from the joints we’re working on
- Try not to wet indoor joints just before the visit
- For business premises, tell us about site rules or sign-in
Get a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.
Advice
Walls and rooflines in Beckley Furnace
Historic houses like Great Dixter (about 2.7 miles north) are a reminder that the area around Beckley Furnace has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you let a flat or house near Doleham station, outside joints that have cracked can let damp into a rental, so check them between lets. Great Dixter, about 2.7 miles north, is one of the historic houses in the wider area around Beckley Furnace.
Beckley Furnace is about 7 miles north of Hastings, in East Sussex. Across the TN31 area, we cover external mastic for homes and businesses. We cover 289 towns and villages across East Sussex. We also work in Brighton, about 34 miles from Beckley Furnace.
Work in TN31 works the same way as everywhere else we cover. Other places close to Beckley Furnace include Broad Oak (1 mile south-west), Broadland Row (1 mile south-east), Beckley (2 miles north-east), Udimore (2 miles south-east) and Northiam (3 miles north). Within a short drive, we also cover Hastings (7 miles south), Bexhill-on-Sea (10 miles south-west), St Leonards (8 miles south), Hastings Old Town (7 miles south), Belmont (7 miles south) and Hollington (7 miles south-west).
Local landmarks in Beckley Furnace
Beckley Furnace’s nearest station is Doleham station, roughly 2.9 miles south of the centre. Nearby you’ll also find Conquest Hospital (5.6 miles south). For a walk, there’s Flatropers Wood.