Hampshire · England
Long Sutton External Mastic
External mastic across Long Sutton and nearby, with old sealant always removed completely and a one-year guarantee.
- Cracked joints where brick meets render or frames
- Joints pointed up with cement by mistake
- Joints with sealant missing in places
About our external mastic in Long Sutton
Many failed façade joints only get noticed once there’s a stain or a damp patch inside. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant in a matching colour. If you are dealing with cracked joints where brick meets render or frames and weathered mastic that no longer stretches, we can help, on brickwork movement joints, copings & trims and concrete & block alike.
In a village or hamlet like Long Sutton, older cottages and farm buildings often stand in the open, so walls and rooflines take the full force of wind and rain. Joints on those walls need a sealant that moves with the building and stays in place.
All our work is covered by our 12-month guarantee.
- Place
- Long Sutton (RG29)
- Region
- Hampshire
- Cover
- One year on every job
- Quote
- A clear price before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What we cannot put right
Sealant is not the answer to every problem, and we will tell you before work begins. Sealant won’t put right:
- Cracks in the bricks or render themselves, away from the joints
- Loose or hollow render, which needs re-rendering
- Damp that isn’t coming from the joint
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think before booking.
Where we work in Long Sutton
- Concrete & block
- Brickwork movement joints
- Render & cladding joints
- Façade panels
- Copings & trims
- Joints between brick and frames
What we are called out for in Long Sutton
Weeds, moss and debris in a joint are a sign the sealant has gone. Dirt and roots then trap moisture in the joint and make things worse.
It’s worth asking for a quote if you see:
- Hard, crazed mastic that has stopped moving
- Brick movement joints where the sealant has split
- Leaking joints around cladding and façade panels
- Moss and dirt in joints with no sealant left
Schools such as Long Sutton Church of England Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
What to look for in a quote
- Whether VAT is included
- What insurance they hold
- Who does the work, and how experienced they are
- How the surfaces are prepared before sealing
What we do, step by step
We keep the work tidy and contained to the area we are working on, so you can carry on as normal. Expect the work to take a few hours to a few days, depending on the length of joint and the access, and we explain the cure time before we leave. Somewhere like Long Sutton needs a little journey planning: 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, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Preparing for the visit
- Try not to wet indoor joints just before the visit
- Tell us if parking is tricky
- Mention any sign-in or site rules at work premises
Ask for a quote
Every job is quoted individually, so the first step is telling us about yours. Just phone 0345 464 0079 or drop us an email with the details.
Related advice
What external mastic looks like in Long Sutton
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.
For landlords with property near Bentley (Hampshire) station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. Homes close to Church of All Saints include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Long Sutton is about 5 miles north of Alton, in Hampshire. Homes, rented property, offices and hotels in Long Sutton can book us for external mastic, old or new, large or small. The work is guaranteed for a year. We cover 683 towns and villages across Hampshire, from the larger towns to small villages. Reading is on our list too, around 16 miles away.
Here we cover the RG29 postcode area for external mastic. If you need external mastic at a property on The Street, Wingate Meadow and Wingate Lane or anywhere close by, we can help. Other places close to Long Sutton include South Warnborough (1 mile west), Well (1 mile east), Bidden (2 miles west), Odiham (2 miles north) and Little Hoddington (2 miles west). Further out, we also cover Basingstoke (8 miles north-west), Farnborough (9 miles north-east), Fleet (6 miles north-east), Aldershot (8 miles east), Alton (5 miles south) and Petersfield (15 miles south).
Near you in Long Sutton
We work in homes and buildings around Lord Wandsworth College and Robert May's School, among other places. The closest station to Long Sutton is Bentley (Hampshire) station, about 4.2 miles south-east of the centre. Well-known places in the area include Odiham Castle (3 miles north) and Alton Community Hospital (5.8 miles south). Not far away are Dogmersfield Lake and Holybourne Hill.
Looking after it afterwards
Joint life depends on how it’s used and looked after. We suggest:
- Never let anyone fill a movement joint with mortar
- Look over the joints every year, ideally after winter
- Keep water from gutters off the wall
- Avoid pressure-washing directly into sealant joints
Only paint over the joint if we have confirmed the sealant can take paint. Many exterior sealants are not designed to be painted, and paint can crack as the joint moves.
Water getting behind cladding or render can go unnoticed for a long time. When it finally shows inside, the joint may have been open for years.
How we quote for external mastic
Call for a quick quote. What matters most is:
- The product the joint needs
- Whether there’s mould to deal with
- The number of rooms or windows
- Whether the work is at height
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
What we need to know
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- If it’s domestic, commercial or a hotel
- Photos by email, if that’s easy
- The address or postcode of the job
- How many joints, rooms or windows are involved
Asking for a quote is easy: let us know the job and the location. A few photos by email make the job easier to understand, and we’ll take it from there.
Questions from Long Sutton
I let a flat near Bentley (Hampshire) station. Can you help?
Yes, we work for landlords and letting agents. Just call 0345 464 0079 or email us and tell us about the property, and we’ll give you a clear price.
Is Long Sutton within the area you cover?
Yes, Long Sutton is covered. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
What is a movement joint?
Brickwork, render and cladding all move a little, and planned joints take up that movement. It’s closed with backing rod and a flexible sealant.
Do you seal joints where cladding meets other materials?
Yes. The old joint is removed, both surfaces cleaned and primed where needed, and a flexible sealant applied. The colour is chosen to suit.
Do you take out the old sealant first?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
What sealant do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
How long will you be here?
That depends on the amount of work, but most jobs take a few hours to a few days, depending on the length of joint and the access. We will tell you when we quote.
How often do external joints need resealing?
It depends on the exposure, the movement and the product. Treat it as a maintenance item and look at it yearly and renew it when it starts to fail.
What happens if it’s left?
A properly done movement joint is an even line in a colour that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner. Around Long Sutton, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Leaving a failed joint usually makes the job bigger, not smaller, as water and mould keep getting in. If you’re unsure, ring 0345 464 0079 or send us an email and we’ll give you an honest view and a quote.
Why choose Mr Mastic in Long Sutton
- A 12-month guarantee on all work
- A sealant colour to suit the surroundings
- You choose the colour before work begins
- Approved under the ARBOMaster scheme
Take a look at our cost guide and customer reviews.
Also near Long Sutton
More services for Long Sutton
Different surfaces, different methods
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
Brick against render, concrete against metal, stone against timber: every change of material is a joint. A flexible sealant bridges the two.