East Sussex · England
External & façade joints in Offham, East Sussex
External mastic across Offham and nearby, with every bit of old sealant taken out first and a 12-month guarantee.
- Plants rooting in failed movement joints
- Rigid filler in a joint that should flex
- Panel joints letting water in
About our external mastic in Offham
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. The colour is chosen to suit the brick or render. If you have joints with sealant missing in places and leaking joints around cladding and façade panels, we can put it right, whatever the surface.
Outside joints can only be sealed when they’re dry, so work in Offham is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
We stand behind the work with a 12-month guarantee, so you’re not left on your own once the job is done.
- Where
- Offham (BN7)
- Wider area
- East Sussex
- Cover
- 12 months on all our work
- Quotes
- A clear price before work begins
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Common problems we fix in Offham
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.
These are the problems we’re asked about most:
- Water getting into walls through failed joints
- Old sealant gone brittle and cracked
- Movement joints filled with mortar instead of sealant
- Failed sealant between panels on a façade
For an older house near a landmark such as Church of St Peter, older walls, gutters and the joints where extensions meet them need a flexible sealant.
What to look for in a quote
- What the quote includes, VAT included or not
- How the surfaces are prepared before sealing
- Whether all the old sealant comes out first
- Who turns up on the day
How to look after the new joints
Looking after new joints is easy:
- Fix overflowing gutters above sealed joints
- Act on the first splits you see
- Tell anyone working on the walls about the movement joints
- Leave the joints unpainted unless we’ve said otherwise
Follow the cure time we give you before the joint is knocked or disturbed. Most exterior sealants skin fast but take longer to cure right through.
Leaks behind façade panels and render often go unseen. By the time there’s a damp patch, the damage can be well established.
What happens on the day
At the end, we look at the finished work together and tell you how long to leave it. The work normally takes a few hours for a handful of joints, longer for a whole elevation, depending on the size of the job. In a small place like Offham, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- Where the joints are inside, avoid wetting them before we arrive
- For business premises, tell us about site rules or sign-in
- Plan for the work area to be out of bounds to pets and children
Get a quote
Every job is quoted individually. Simply phone 0345 464 0079 or drop us an email and describe the job.
Advice
FAQs for Offham
Is Offham in your area for external mastic?
Yes. We work across London and the South East, and Offham is part of that. Just phone 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear price.
Can you help a landlord with a rental near Cooksbridge station?
Yes. We work for landlords and agents as well as householders. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we’ll send you a clear quote.
What is a movement joint?
Brickwork, render and cladding all move a little, and planned joints take up that movement. The gap is sealed with a flexible sealant over backing rod.
Do you use backing rod?
Backing rod goes into deeper joints as a matter of course. It sets the sealant depth and prevents three-sided bonding, so the joint can move.
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. We remove it all first.
Should I try DIY first?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. If it doesn’t work out, we can redo it.
What do you need from me for a quote?
Just the basics: the address or postcode, what’s wrong and any access issues. After that, simply phone 0345 464 0079 or email us.
Can I add another job to the visit?
Yes, we can. Several rooms, windows or areas can go on one quote.
Places near Offham
More services for Offham
Quotes for external mastic in Offham
Your quote is based on your job. We look at:
- How much old sealant there is and how hard it is to remove
- Whether the work is at height
- Working hours on commercial sites
- Any mould that needs treating
The cost depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before any work starts.
Helping us quote
Photos by email are helpful but not essential. Please mention:
- Whether it has been sealed before
- What’s wrong with the joints now
- The rough size of the job
- Whether it’s a home or a business
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email photos if that’s easy.
Offham buildings and the weather
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Anne of Cleves House (about 1.7 miles south-east) nearby, there’s older building stock in the area around Offham as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
Schools such as Wallands Community Primary School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. For landlords with property near Cooksbridge station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Offham is about 1 mile north-west of Lewes, in East Sussex. Anywhere in BN7, we can carry out external mastic at your property. Our East Sussex coverage runs to 289 places, Offham among them. We also work in Brighton, around 7 miles away.
All of BN7 is covered for external mastic. Other places close to Offham include Hamsey (1 mile north-east), Lewes (1 mile south-east), South Malling (1 mile south-east), Southover (2 miles south-east) and Cliffe (2 miles south-east). Within a short drive, we also cover Eastbourne (15 miles south-east), Seaford (10 miles south-east), Hailsham (12 miles east), Crowborough (14 miles north-east), Uckfield (7 miles north-east) and Newhaven (7 miles south).
Local landmarks in Offham
Locally, jobs take us to homes and businesses close to Railway Land, The Blacksmiths Arms and Lewes Old Grammar School and the streets around them. The closest station to Offham is Cooksbridge station, roughly 0.9 miles north of the centre. Nearby you will also find Brighton And Hove Albion Football Club Museum (3.8 miles south-west) and Lewes Castle (1.5 miles south-east). Open spaces near Offham include Malling Down and Offham Hill.
What we can’t put right
In fairness, some problems need a different trade:
- Movement that’s more than a sealant joint can take
- Cracks in the bricks or render themselves, away from the joints
- Walls that need new movement joints cut into them
If in doubt, call 0345 464 0079 or send us an email and we will say what we think before booking.
Where we work in Offham
- Brickwork movement joints
- Render & cladding joints
- Copings & trims
- Concrete & block
- Façade panels
- Joints between brick and frames
Should I try it myself 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.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
Landlords, agents and businesses in Offham
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
In hotels, rooms out of use cost money, so we plan the work room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.