Hertfordshire · England
External & façade joints in Charlton, Hertfordshire
Sealing brickwork movement joints, render, cladding and façade joints for householders, landlords and businesses in Charlton. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Leaking joints around cladding and façade panels
- Plants rooting in failed movement joints
- Joints with sealant missing in places
Leave it or put it right?
A properly done movement joint is an even line in a colour that suits the wall. A rushed bead with no backing looks untidy and does not last so it’s worth doing right. Older cottages and farmhouses around Charlton can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Why us?
- Tidy, careful work
- 4.9 on Google from 180+ five-star reviews
- Colour picked to suit the job
- Every job guaranteed for a year
See our cost guide and our reviews.
External mastic in Charlton
For buildings in Charlton, we reseal external joints of all kinds, from brick movement joints to cladding panels. Every joint gets the same careful preparation: clean joint faces and the right depth. Typical jobs include brick movement joints where the sealant has split and gaps where render, brick and frames meet, across façade panels, joints between brick and frames and render & cladding joints.
Around Charlton, older buildings can be stone, brick or timber-framed, many with extensions added later. The joints where those materials meet are the weak points, and they need the right sealant at the right depth.
Each job carries a 12-month guarantee, whatever its size.
- Place
- Charlton (SG5)
- Wider area
- Hertfordshire
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
How to look after the new joints
Good habits help new joints last longer. A few tips:
- Fix overflowing gutters above sealed joints
- Point out the joints to other trades
- Have failed joints looked at early
- Keep high-pressure jets off the joints
Don’t let soil, plants or ivy build up against the new joints. Damp material against the sealant shortens its life.
Small splits are the time to act. Then it’s a straightforward cut-out and reseal before water has had years to get in.
How the visit works
Most of a good job is in the preparation, and we do not rush it. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours to a few days, depending on the length of joint and the access. In a small place like Charlton, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- The old mastic and anything lodged in the joint is removed.
- We clean both faces of the joint and prime them where the product calls for it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
How to prepare
- Mention any sign-in or site rules at work premises
- Let us know if you’ve seen damp or leaks
- Mention any parking rules near the property
Ask for a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we’ll explain how we’d tackle it. When it suits you, phone 0345 464 0079 or send us an email.
Related advice
Work for landlords, hotels and businesses
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can be quoted together.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Should I try it myself first?
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so just mention it when you contact us.
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Honest limits
We won’t take on work that won’t last, so here’s what sealant cannot put right:
- Damp that is not coming from the joint
- Loose or hollow render, which needs re-rendering
- Structural movement, which needs a surveyor or engineer
If in doubt, call 0345 464 0079 or drop us an email and we’ll say what we think.
What we seal
- Concrete & block
- Brickwork movement joints
- Façade panels
- Joints between brick and frames
- Render & cladding joints
- Copings & trims
Walls and rooflines in Charlton
The South East is one of the drier parts 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 Hitchin station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. Homes close to St Mary's Church include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant.
Charlton is about 1 mile south-west of Hitchin, in Hertfordshire. For external mastic in and around Charlton, it’s easy to get a quote: please call 0345 464 0079 or email us. We cover Hertfordshire from our Crawley base, Charlton included. Across Hertfordshire, we cover 381 places, Charlton among them. London is on our list too, around 31 miles away.
All of SG5 is covered for external mastic. Other places close to Charlton include Gosmore (1 mile south-east), Hitchin (1 mile north-east), Benslow (1 mile north-east), Bearton (1 mile north) and Westmill (1 mile north). Larger places within reach include Hemel Hempstead (15 miles south-west), Stevenage (5 miles south-east), St Albans (13 miles south), Welwyn Garden City (11 miles south), Harpenden (9 miles south) and Hatfield (12 miles south).
Around Charlton
We work in homes and buildings around Hitchin Boys' School, The Three Moorhens Public House and Kingshott School, among other places. Charlton’s nearest station is Hitchin station, roughly 1.4 miles north-east of the centre. A little further out are North Hertfordshire Museum (0.8 miles north-east) and Lister Hospital (3.3 miles east). Open spaces near Charlton include Markham's Hill and Oughtonhead Nature Reserve.
FAQs for Charlton
Is Charlton within the area you cover?
Yes. Charlton is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
I let a flat near Hitchin station. Can you help?
Yes, we work for landlords and agents. Just call 0345 464 0079 or drop us an email and tell us about the property, and we’ll send you a clear quote.
Why is there a gap in my brick wall?
Brickwork, render and cladding all move a little, so long walls have planned gaps to take that movement. The gap is sealed with a flexible sealant over backing rod.
Will there be a smell?
Possibly a little. It fades as the sealant cures, and ventilation helps.
How long will you be here?
As a guide, most jobs take a few hours to a few days, depending on the length of joint and the access. Bigger jobs take longer.
Do I need to be at home?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
What colours does the sealant come in?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We choose the closest to your brick or render so it doesn’t stand out.
Are you insured?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
What we are called out for in Charlton
Sunlight, wet weather and frost wear exterior sealant down. In time it goes hard, crazes on the surface and stops stretching, so the joint eventually tears or comes away from one side.
These are the problems we are asked about most:
- Failed sealant between panels on a façade
- Gaps where render, brick and frames meet
- Joints where the bead has come unstuck
- Water getting into walls through failed joints
For site and facilities teams at buildings such as Highbury Infant School and Nursery, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Comparing quotes
- Is the old sealant removed completely?
- What happens if they find a problem under the old sealant
- What insurance they hold
- Who turns up on the day