Hampshire · England
Chawton External Mastic
Problem with your movement joints in Chawton? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Hard, crazed mastic that has stopped moving
- Failed seals between different materials
- Brick movement joints where the sealant has split
When it is not the sealant
Sealant is not the answer to every problem, and we will tell you before we start. Sealant will not put right:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Cracks in the bricks or render themselves, away from the joints
- Adding movement joints to masonry that has none
Not sure which it is? You can call 0345 464 0079 or drop us an email and we will tell you honestly.
Surfaces we seal
- Render & cladding joints
- Brickwork movement joints
- Façade panels
- Concrete & block
- Copings & trims
- Joints between brick and frames
How we handle external mastic in Chawton
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible exterior sealant takes up that movement. We work on concrete & block, joints between brick and frames and façade panels, and the jobs we see most are cracked joints where brick meets render or frames and failed sealant between panels on a façade.
Around Chawton, 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.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Where
- Chawton (GU34)
- Wider area
- Hampshire
- Cover
- A year, on every job
- Quote
- A clear price before we start
- Call
- 0345 464 0079
- Updated
- 26 October 2026
How we quote for external mastic
Every job gets its own quote. These are the things that affect it:
- The number and length of the joints
- The type of sealant required
- How easy the joints are to reach
- Mould in or behind the old joints
A failed joint rarely gets cheaper to fix by waiting. If you are unsure, call 0345 464 0079 or drop us an email for an honest opinion and a quote.
What we need to know
When you call or email, these details help:
- Whether it has been sealed before
- How many joints, rooms or windows are involved
- Access, such as stairs, a lift or height
- Pictures of the joints, sent by email
Every job is quoted individually, so the first step is telling us about yours. Simply ring 0345 464 0079 or drop us an email and describe the job and send photos if you have them.
What we do, step by step
Once we’re on site, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. Most jobs then take anything from a few hours to several days, depending on the building. In a small place like Chawton, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- 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.
Getting ready for the visit
- Let us know about parking restrictions
- Tell us about any previous sealing or DIY attempts
- For business premises, tell us about site rules or sign-in
How to get a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that is easy.
Related advice
FAQs for Chawton
Can you do external mastic in Chawton?
Yes, Chawton is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we will send you a clear quote.
I let a flat near Alton station. Can you help?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we’ll send you a clear quote.
Do you do commercial work?
Yes. Larger jobs can be planned room by room or area by area to suit the site.
Do you seal joints where cladding meets other materials?
Yes. Joints between dissimilar materials are a big part of external work. The sealant is chosen to bond to both sides with primer where required.
What is a movement joint?
It’s a deliberate gap that lets the wall expand and contract without cracking. It’s sealed with a flexible sealant, not mortar.
Can you reach joints on upper floors?
It depends on the building. We work on joints that can be reached safely. Tell us about the building and we’ll confirm what access is needed.
Is it OK to fill a movement joint with cement?
No. Rigid materials can’t move with the wall. Where a joint has been mortared, it can often be raked out and sealed properly.
Are you fully insured?
Yes. We are fully insured, and we can confirm the details when we quote.
More services for Chawton
Outside joints around Chawton
Historic houses like Bentworth Hall (about 2.8 miles west) are a reminder that the area around Chawton 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. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For landlords with property near Alton station, split movement joints are easy to miss on a rental until damp shows inside. Schools such as Chawton Church of England Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
Chawton is about 1 mile south-west of Alton, in Hampshire. Whether you are in the middle of Chawton or further out, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Chawton is one of 683 places in Hampshire where we work. There’s also a page for Reading, about 22 miles away.
We cover every part of GU34 for external mastic and the streets around it. We cover properties on Winchester Road and Wolf's Lane. Close by, we work in Alton (1 mile north-east), Upper Farringdon (2 miles south), Lower Farringdon (2 miles south), Farringdon (2 miles south) and Hartley Mauditt (2 miles south-east). Within a short drive, we also cover Basingstoke (10 miles north-west), Winchester (15 miles west), Farnborough (15 miles north-east), Fleet (12 miles north-east), Aldershot (13 miles north-east) and Petersfield (9 miles south).
What’s near Chawton
Typical jobs here are in homes near The Greyfriar pub and Amery Hill School. For rail, the closest station is Alton station, about 1.6 miles north-east of the centre. Nearby you will also find Allen Gallery (1.3 miles north-east) and Alton Community Hospital (under half a mile north). Not far away are King's Hill.
What the job involves on each surface
Cladding and façade panels
Panel systems often rely on sealant between and around the panels. Each joint gets a sealant that suits the panel and its movement.
Concrete and blockwork
The face of concrete or block is often dusty, so cleaning and priming matter. A primer goes on where the product requires one before the bead.
For landlords and businesses
Housing providers, facilities teams and property managers book us too in Chawton and across Hampshire. We can quote a run of properties together, and we are fully insured for the work.
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. Our tips:
- Ask before painting over external sealant
- Deal with leaking gutters that soak the joints below
- Act on the first splits you see
- Avoid pressure-washing directly into sealant joints
Do not paint over the new sealant unless we’ve said the product is paintable. Many exterior sealants are not designed to be painted.
If you can see gaps, plants or bare sections in a joint, have it checked. Early work is quicker and leaves a better finish.
Signs you need external mastic in Chawton
Weeds, moss and debris in a joint are a sign the sealant has gone. Roots and dirt hold water against the wall and make things worse.
Keep an eye out for any of the following:
- Weathered mastic that no longer stretches
- Moss and dirt in joints with no sealant left
- Movement joints with cracked, split or missing sealant
- Rain getting behind render or cladding at a joint
In the older streets around Church of St Nicholas, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Before booking anyone
- Who turns up on the day
- The length of the guarantee
- Which colour the sealant will be
- Is VAT in the price?