Bracknell Forest · England
External & façade joints in Harmans Water, Bracknell Forest
Movement joints in Harmans Water need attention? We cut out the old, prepare the joints and apply the right sealant.
- Movement joints filled with mortar instead of sealant
- Old sealant gone brittle and cracked
- Brick movement joints where the sealant has split
External mastic in Harmans Water, done properly
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible exterior sealant takes up that movement where a rigid filler would soon crack. If you’re dealing with gaps where render, brick and frames meet and failed sealant between panels on a façade, we can help, on brickwork movement joints, copings & trims and joints between brick and frames alike.
In a smaller place like Harmans Water, some homes face open ground, so exposed walls and rooflines take more wind-driven rain. Joints on those sides are generally the first to go.
Whatever the size of the job, it’s backed by our one-year guarantee.
- Where
- Harmans Water (RG12)
- Region
- Bracknell Forest
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Harmans Water questions
Should the sealant in an older Harmans Water home be renewed?
Normally, yes, if it’s cracked, shrunk, mouldy or coming away. The key is cutting all the old sealant out, as new sealant won’t bond to it.
Can you help a landlord with a rental near Martins Heron station?
Yes, landlords and agents are among the people we work for. You can call 0345 464 0079 or email us with the details for a clear quote.
Can you seal joints between render and window frames?
Yes. Joints between dissimilar materials are a big part of external work. The sealant is chosen to bond to both sides.
Where is Mr Mastic based?
Our base is in Crawley, and we work across South East England, London and Scotland.
Do you come to Harmans Water?
Yes, we do. Harmans Water is part of the area we cover.
Do you do commercial work?
Yes. We’ve worked for hotels, offices and other businesses, and we are fully insured.
Can you do several jobs on one visit?
Yes, we can. More than one area can be quoted together.
Will there be a smell?
Possibly a little. Any smell clears as the sealant cures.
Places near Harmans Water
More services for Harmans Water
Outside joints around Harmans Water
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Harmans Water is part of Bracknell, one of the post-war new towns. Many homes date from the post-war decades and were built in phases, so neighbouring houses often have rooflines and wall joints of the same age, wearing out at the same time.
Schools such as Harmans Water Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing. In the older streets around St Paul, an extension built onto an older house moves differently, and the joint between them takes the strain.
Harmans Water is about 1 mile south-east of Bracknell, in Bracknell Forest. Jobs in Harmans Water get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Across Bracknell Forest, we cover 41 places, and Harmans Water is one of them. For nearby work, see our Reading page (11 miles or so).
Postcode districts we cover here for external mastic: RG12. Whether your property is on The Square, Jaguar Lane and Mendip Road or anywhere close by, we can help. Harmans Water sits on or near the A322, which makes travel easy. Close by, we work in Jennett's Park (1 mile north-east), Forest Park (1 mile east), The Warren (1 mile east), Easthampstead (1 mile west) and Bracknell (1 mile north-west). Larger places within reach include Sandhurst (4 miles south-west), Binfield (3 miles north-west), College Town (5 miles south), Little Sandhurst (5 miles south-west) and Owlsmoor (4 miles south-west).
Local landmarks in Harmans Water
Around Harmans Water, our work takes us to homes and buildings near The Brakenhale School, The Horse And Groom Public House and The Brakenhale School, among other places. The nearest railway station is Martins Heron station, about 0.6 miles north-east of the centre. Nearby you will also find The Lexicon (1.1 miles north-west) and Heatherwood Hospital (2.3 miles east). Green spaces nearby include Wildmoor Heath and Heath Lake.
Common problems we fix in Harmans Water
Buildings move more than people expect. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. All of that ends up in the joint sealant.
Most people get in touch after spotting one of these:
- Sealant that has lost its bond to the brick or render
- Movement joints filled with mortar instead of sealant
- Joints with sealant missing in places
- Leaking joints around cladding and façade panels
Letting a property close to Martins Heron station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Comparing quotes
- Whether all the old sealant comes out first
- How hidden problems are handled
- What preparation is included
- When the joint can take water or movement
Why act early in Harmans Water
Mortar or ordinary filler might look like a quick way to close an open joint, but it locks the joint solid. The movement then cracks the brickwork or render nearby. The correct repair is a flexible sealant with the right backing. In a smaller place like Harmans Water, wherever a wall is exposed, a failed outside joint is a real source of damp. Indoors, a failed seal lets water into floors and panels as it would anywhere.
What it costs depends on the size of the job, how much old material has to come out and access to the work. We give a clear quote before we start.
Why us?
- 12-month guarantee on every job
- Old sealant always removed completely
- 4.9 on Google from 180+ five-star reviews
- Domestic, commercial and hotel work
Read what affects the cost and our reviews.
When something else is needed
In fairness, some problems need a different trade:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Damp that isn’t coming from the joint
- Movement that’s more than a sealant joint can take
Not sure which it is? You can phone 0345 464 0079 or send us an email and we’ll tell you honestly before you book.
Where we work in Harmans Water
- Joints between brick and frames
- Render & cladding joints
- Concrete & block
- Brickwork movement joints
- Copings & trims
- Façade panels
Aftercare tips
So the new joints stay in good condition:
- Act on the first splits you see
- Tell anyone working on the walls about the movement joints
- Keep water from gutters off the wall
- Keep high-pressure jets off the joints
Give the sealant the cure time we tell you before anything rubs against it. The surface skins over quickly, but full cure takes longer.
A joint that has stopped moving pushes the movement elsewhere, usually as cracking in the brickwork or render nearby. Catch it early and you reduce the risk.
For landlords and businesses
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
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.
What happens on the day
Good joint work is mostly preparation, and we do not rush it. Joints are cleaned back and dried before anything new goes in. In total, it usually takes anything from a few hours to several days, depending on the building. For a job in Harmans Water, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- 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.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
- On commercial sites, let us know about site rules
- Keep pets and children clear of the area while we work
How to get a quote
Getting a quote is simple: let us know what needs doing and where. A few photos by email make the job easier to understand.
Advice
Can I do it myself?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.