Slough · England
Brands Hill External Mastic
External mastic across Brands Hill and nearby, with old sealant always removed completely.
- Sealant pulling away from one side of the joint
- Joints with sealant missing in places
- Water getting into walls through failed joints
Quotes for external mastic in Brands Hill
Call for a quick quote. The main things that affect it are:
- The old material and how stubborn it is
- The type of sealant required
- Any working-time requirements on site
- Whether there’s mould to deal with
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you’re not sure whether it needs doing, ring 0345 464 0079 or drop us an email for an honest opinion and a quote.
What we need to know
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- Photos by email, if that’s easy
- Any previous sealing or DIY work
- Roughly how big the job is
- What’s wrong with the joints now
We do not publish a price list, because every job is different. Instead, we give you a clear price for your job. To arrange one, call 0345 464 0079 or drop us an email.
External mastic in Brands Hill, done properly
A movement joint is a deliberate break that lets a wall expand and contract. Its sealant has to flex with the building, season after season, and when it fails, the wall takes the strain and water finds a way in. We work on render & cladding joints, concrete & block and copings & trims, and the jobs we see most are failed sealant between panels on a façade and weeds or debris growing in open joints.
Outside joints can only be sealed when they’re dry, so work in Brands Hill is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Location
- Brands Hill (SL3)
- Region
- Slough
- Cover
- One year on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Different surfaces, different methods
Joints between dissimilar materials
Wherever two materials meet, they move differently. We seal the joint with a flexible exterior sealant so neither cracks the other.
Copings and trims
Coping joints that leak let water straight down into the wall. Sealing them early saves the wall below.
What we are called out for in Brands Hill
Joints sealed without backing rod, or far too deep, rarely last. If the sealant sticks to the back as well as the sides, it cannot stretch and tears as soon as the joint widens.
These are the problems we are asked about most:
- Movement joints with cracked, split or missing sealant
- Hard, crazed mastic that has stopped moving
- Failed seals between different materials
- Plants rooting in failed movement joints
In the older streets around Church of St Michael, older walls, gutters and the joints where extensions meet them need a flexible sealant.
What your quote should include
- What preparation is included
- What the quote includes, VAT included or not
- Whether they’re fully insured
- Who turns up on the day
Towns and villages near Brands Hill
Also in Brands Hill
How it works
There is not much for you to do on the day. Show us the job and we’ll take it from there. The job generally takes anything from a few hours to several days, depending on the building. Somewhere like Brands Hill 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.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Getting ready for the visit
- Mention any sign-in or site rules at work premises
- Clear items away from the joints we’re working on
- Mention any tricky access
Getting a quote
For a quote, call 0345 464 0079 or drop us an email with the location and a short description of the problem. We’ll send you a clear quote before any work starts.
Advice
DIY versus a professional finish
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly.
External mastic in Brands Hill: local notes
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. Historic houses like Frogmore House (about 2.4 miles west) are a reminder that the area around Brands Hill has older buildings as well as new. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
If you look after a building such as Colnbrook Church of England Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. Letting a property close to Sunnymeads station? Then split movement joints are easy to miss on a rental until damp shows inside.
Brands Hill is about 3 miles south-west of West Drayton, in Slough. Jobs in Brands Hill get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. Brands Hill is one of 31 towns and villages in Slough where we work. We also work in London, around 19 miles away.
Jobs for external mastic in SL3 is quoted and booked the same way as anywhere else. Nearby, we also carry out external mastic in Horton (1 mile south), Colnbrook (1 mile east), Poyle (1 mile east), Sunnymeads (1 mile south-west) and Ditton (1 mile north-west). Further out, we also cover Slough (4 miles north-west), Cippenham (5 miles north-west), Chalvey (4 miles north-west), Britwell (5 miles north-west), Upton (3 miles north-west) and Burnham (6 miles north-west).
Local landmarks in Brands Hill
Typical jobs here are in homes near Langley Grammar School, The Crown Public House And Attached Barn and Arthur Jacob Nature Reserve. The closest station to Brands Hill is Sunnymeads station, roughly 1.1 miles south-west of the centre. A little further out are Windsor Castle (2.8 miles west) and Museum of Eton Life (3.1 miles west). Open spaces near Brands Hill include Uxbridge Moor and Staines Reservoirs.
Leave it or put it right?
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That matters on brick, render and concrete, which can be weaker at the face. Too stiff a sealant can pull at the edges and break them. Where a wall is exposed, as many are in small places like Brands Hill, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
Why Brands Hill customers choose us
- Neat joints and a tidy finish
- We never seal over old sealant
- Over 20 years’ experience
- One-year guarantee on every job
Take a look at what affects the cost or what customers say.
Your questions about external mastic in Brands Hill
Can you do external mastic in Brands Hill?
Yes, Brands Hill is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or email us with a few details of the job, and we will give you a clear quote.
Do you cover smaller places like Brands Hill?
Yes, Brands Hill is covered. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
What information do you need?
Only a few details: the address or postcode, what’s wrong and any access issues. After that, simply ring 0345 464 0079 or email us.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done and we’ll quote it together.
Why is there a gap in my brick wall?
Most straight vertical gaps in brickwork are movement joints. It lets the bricks expand without cracking and needs a flexible seal, not mortar.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status.
Can you seal joints between two different materials?
Yes. Different materials move at different rates, so a flexible sealant is needed where they meet. We choose one that suits both surfaces.
How long does external mastic take?
That depends on the amount of work, but as a guide it takes anything from a few hours to several days, depending on the building. We’ll tell you when we quote.
How to look after the new joints
Simple care keeps the joints in good condition. We recommend:
- Look over the joints every year, ideally after winter
- Tell anyone working on the walls about the movement joints
- Keep movement joints as flexible joints, not mortar
- Deal with leaking gutters that soak the joints below
Keep pressure washers away from the sealant. High-pressure water can lift the edges over time.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.