Surrey · England
External Mastic in Stonehill
Sealing brickwork movement joints, render, cladding and façade joints for Stonehill, backed by a 12-month guarantee. Call for a quick quote.
- Rigid filler in a joint that should flex
- Water getting into walls through failed joints
- Panel joints letting water in
When it is not the sealant
Before booking, it’s worth knowing the limits:
- Adding movement joints to masonry that has none
- Structural movement, which needs a surveyor or engineer
- Render that’s blown, hollow or coming away
If you are not sure, just phone 0345 464 0079 or email us and we will give you a straight answer.
Joints and surfaces we work on
- Brickwork movement joints
- Render & cladding joints
- Concrete & block
- Copings & trims
- Joints between brick and frames
- Façade panels
How we handle external mastic in Stonehill
A movement joint is only as good as its depth. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, leaving it bonded to two faces so it can move with the wall. If you are dealing with sealant pulling away from one side of the joint and weathered mastic that no longer stretches, we can put it right.
Around Stonehill, older buildings can be stone, brick or timber-framed, many with extensions added later. Where one material meets another is where water normally gets in, and they need the right sealant at the right depth.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Where
- Stonehill (KT16)
- Wider area
- Surrey
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Your questions about external mastic in Stonehill
Do you work for landlords with property near Longcross station?
Yes, we work for letting agents and landlords. You can call 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before work begins.
Is Stonehill in your area for external mastic?
Yes, Stonehill is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or drop us an email and tell us what needs doing, and we’ll send you a clear quote.
Do I need to be at home?
That depends on where the joints are. Inside work needs someone to give us access.
Where are you based?
Our base is Crawley. Our area covers South East England, London and Scotland.
When will the joints need doing again?
That varies with the weather the wall faces, how much it moves and the sealant used. Sealant is a maintenance item, so check the joints once a year.
Which products do you use?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Do you work at height?
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.
Why is there a gap in my brick wall?
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.
How it works
There’s no need to move everything out before we come, just the space around the work. We protect the rest, and the job takes a few hours for a handful of joints, longer for a whole elevation for a typical job. Somewhere like Stonehill needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
How to prepare
- Mention if the joints have been sealed before
- Mention any tricky access
- Tell us if parking is tricky
How to get a quote
For a quick quote, get us on the phone, or email us if that is easier. Tell us about the joints that need doing and we’ll explain what’s involved before giving you a price.
Advice
How to look after the new joints
No joint lasts for ever, but care makes a real difference. A few tips:
- Get split or bare joints resealed while the damage is small
- Clear growth from the base of walls and joints
- Keep movement joints as flexible joints, not mortar
- Check the sealant is paintable before painting near it
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They should be kept open and resealed, not filled.
An open movement joint lets rain into the wall every time it pours. That can lead to damp patches, staining and frost damage which cost more to put right than the joint.
For landlords and businesses
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.
In hotels, rooms out of use cost money, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
External mastic in Stonehill: local notes
Historic houses like Botleys Mansion (about 1.4 miles north-east) are a reminder that the area around Stonehill has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. 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.
In the older streets around Christ Church, old and new materials meet at the roofline and walls, which is where sealant earns its keep. Rented homes near Longcross station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies. If you look after a building such as Salesian School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Stonehill is about 3 miles north of Woking, in Surrey. Jobs in Stonehill get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Across Surrey, we cover 395 places, and Stonehill is one of them. Our Reading page covers work nearby (19 miles or so).
Every address in KT16 is within our area for external mastic. We cover properties on Stonehill Road and Stonehill Crescent and the roads around them. Neighbouring places we cover for external mastic include Ottershaw (1 mile east), Longcross (1 mile north-west), Mimbridge (2 miles south-west), Lyne (2 miles north-east) and Trumps Green (2 miles north). Within a short drive, we also cover Guildford (8 miles south), Woking (3 miles south), Camberley (8 miles west), Epsom (13 miles east), Farnham (15 miles south-west) and Ewell (13 miles east).
Landmarks near Stonehill
Around Stonehill, our work takes us to homes and buildings near Gracious Pond, among other places. For rail, the closest station is Longcross station, roughly 2.1 miles north-west. Well-known places in the area include Chobham Museum (2.2 miles south-west) and The Peacocks (3.1 miles south). Not far away are Gracious Pond and St Ann's Lake.
DIY sealant or a professional job?
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
Other services in Stonehill
Quotes for external mastic in Stonehill
Jobs vary more than people expect. What affects the quote:
- The size of the job
- The old material and how stubborn it is
- When we can work, for business premises
- The type of sealant required
Combining jobs into one visit generally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. You will get one clear quote for the whole job.
Helping us quote
Photos by email are helpful but not essential. Try to tell us:
- Where the job is, and your postcode
- Whether it’s a home or a business
- Roughly how big the job is
- What’s wrong with the joints now
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.
What happens if it’s left?
Sealing over the top of old mastic does not hold for long. The new layer cannot bond properly to old, weathered material, so the old joint is cut out fully first. Around Stonehill, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
What you pay reflects the work, not guesswork. That is why we ask about the job first and give you a clear quote before work begins.
Why choose Mr Mastic in Stonehill
- Quality sealants from Arbo and Everbuild
- Colour picked to suit the job
- Experience in homes, commercial sites and hotels
- Neat joints and a tidy finish
Take a look at our cost guide or customer reviews.