Surrey · England
External & façade joints in Westhumble, Surrey
Specialist external mastic for Westhumble: careful preparation, the right product and tidy work. Call for a quick quote.
- Damp patches traced to an open external joint
- Plants rooting in failed movement joints
- Brick movement joints where the sealant has split
About our external mastic in Westhumble
On houses, flats and commercial buildings across Westhumble, we reseal joints in brickwork, render, cladding and façade panels. The preparation is the same whatever the wall: clean joint faces and the right depth. If you have joints pointed up with cement by mistake and failed sealant between panels on a façade, we can put it right, on joints between brick and frames, render & cladding joints and brickwork movement joints alike.
Older homes in small places like Westhumble may be stone, brick or timber-framed, often with later extensions. The joints where those materials meet are the weak points.
We stand behind the work with a 12-month guarantee, so you’re covered after we have gone.
- Location
- Westhumble (RH5)
- Wider area
- Surrey
- Cover
- One year on every job
- Price
- A clear price before we start
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What we do, step by step
On the day, we look over the joints with you first, so there are no surprises. Surfaces next to the work are protected before any work begins. The work generally takes a few hours to a few days, depending on the length of joint and the access. For a village or hamlet like Westhumble, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Before we arrive
- Mention any leaks or damp you’ve noticed
- Move anything stored near the joints
- Try not to wet indoor joints just before the visit
Get a quote
If you’re in Westhumble and need external mastic, call 0345 464 0079 or email us. Tell us what the problem is and where, and you will get a clear quote before any work starts.
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DIY versus a professional finish
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Sealing over old silicone is the commonest DIY error. 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.
Quotes for external mastic in Westhumble
We quote each job individually. This is what makes a difference:
- Any working-time requirements on site
- The number and length of the joints
- Which sealant suits the joint
- How many rooms, windows or areas are involved
The cost reflects the work involved, not a rough estimate. That’s why we ask about the job first.
Helping us quote
To make quoting easier, let us know:
- Whether it’s a home or a business
- Any previous sealing or DIY work
- Any access issues, like height or stairs
- How many joints, rooms or windows are involved
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.
Aftercare tips
Good habits help new joints last longer. Our tips:
- Keep water from gutters off the wall
- Tell anyone working on the walls about the movement joints
- Leave the joints unpainted unless we have said otherwise
- Make sure movement joints are not pointed over
Have a quick look at the joints each spring. Splits, gaps at the edges or plants in the joint are early warning signs.
Leave a failed movement joint and water keeps getting into the wall. Over time it can mean damp inside, stained render or frost-damaged brick.
What external mastic looks like in Westhumble
With historic houses such as Polesden Lacey (about 1.8 miles west) nearby, there’s older building stock in the area around Westhumble as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. 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.
If you look after a building such as The Ashcombe School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. Letting a property close to Box Hill & Westhumble station? Then split movement joints are easy to miss on a rental until damp shows inside.
Westhumble is about 2 miles north of Dorking, in Surrey. Jobs in Westhumble get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. Across Surrey, we cover 395 places, and Westhumble is one of them. Crawley is on our list too, around 12 miles away.
We cover every part of RH5 for external mastic and the streets around it. Whether your property is on Adlers Lane, Chapel Lane and Burney Road or anywhere close by, our applicators can take on the job. If you’re just outside Westhumble, we cover Pixham (1 mile south-east), Mickleham (1 mile north-east), Ranmore Common (2 miles south-west), Dorking (2 miles south) and Westcott (2 miles south-west). We also work in nearby towns such as Guildford (10 miles west), Woking (11 miles north-west), Epsom (6 miles north-east), Horley (9 miles south-east), Redhill (7 miles east) and Ewell (8 miles north-east).
What’s near Westhumble
In Westhumble, that means homes and buildings near Norbury Park, Stepping Stones pub and Pippbrook House, among other places. There’s a railway station in Westhumble itself: Box Hill & Westhumble station. Other landmarks nearby include Headley Court (3.6 miles north-east) and Betchworth Castle (1.9 miles south-east). Not far away are Box Hill and Reigate Heath.
Common questions in Westhumble
Is Westhumble within the area you cover?
Yes. Westhumble is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Can you help a landlord with a rental near Box Hill & Westhumble station?
Yes, we work for letting agents and landlords. Just call 0345 464 0079 or send us an email and tell us about the property, and we’ll send you a clear quote.
Does someone need to be in?
Access is agreed with you when the job is booked. Indoors, that normally means someone at home.
What’s an expansion joint in brickwork?
Most straight vertical gaps in brickwork are movement joints. It gives the wall room to move, and it should be sealed with a flexible sealant.
Do you work for hotels and businesses?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. We can talk about working times when we quote.
How long does external mastic last?
It varies with how exposed the wall is and how much the joint moves. Look for splits, hardening or edges coming away.
Are you ARBOMaster approved?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Can a movement joint be filled with mortar?
No. Mortar locks the joint solid, so the wall cracks somewhere else instead. It needs a flexible sealant over backing rod.
Nearby places to Westhumble
What else we do in Westhumble
When something else is needed
We’d rather tell you now than do work that will not last, so these are the limits:
- Failed render or damaged cladding panels
- Damp that isn’t coming from the joint
- Adding movement joints to masonry that has none
If in doubt, call 0345 464 0079 or email us and we will say what we think.
Where we work in Westhumble
- Render & cladding joints
- Concrete & block
- Brickwork movement joints
- Joints between brick and frames
- Copings & trims
- Façade panels
Common problems we fix in Westhumble
Every building moves. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. The sealant in the movement joints takes that strain.
The most common problems we see are:
- Panel joints letting water in
- Sealant that has lost its bond to the brick or render
- Brick movement joints where the sealant has split
- Gaps where render, brick and frames meet
In the older streets around Church of St Michael, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Questions to ask before you book
- How the colour is chosen
- The length of the guarantee
- How the joint is cleaned and prepared
- What happens if the job turns out different
For landlords and businesses
We also work for property managers and facilities teams. Several sites can go on one quote, and we’re fully insured for the work.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.