Surrey · England
External & façade joints in Dorking, Surrey
Sealing brickwork movement joints, render, cladding and façade joints for Dorking, backed by a 12-month guarantee. Call for a quick quote.
- Weathered mastic that no longer stretches
- Rain getting behind render or cladding at a joint
- Sealant pulling away from one side of the joint
Leave it or put it right?
The longer a joint stays open, the more water the wall takes in. In cold weather, frost can damage wet brick and render around the joint, so the problem grows beyond the joint itself. Draughts from a gap round a frame, damp under a sill or water behind a bath panel all start small, and they’re far easier to fix early.
Leaving a failed joint normally makes the job bigger, not smaller, as water and mould keep getting in. If you are not sure whether it needs doing, call 0345 464 0079 or send us an email and we will give you an honest view and a quote.
Why choose Mr Mastic in Dorking
- A choice of colours where the product allows
- Every job guaranteed for a year
- Tidy, careful work
- Sealant colour chosen to suit
Take a look at our cost guide or our reviews.
External mastic in Dorking, done properly
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 have water getting into walls through failed joints and brick movement joints where the sealant has split, we can put it right, on render & cladding joints, concrete & block and façade panels alike.
Around Dorking, outside jobs take in garage door frames, porches, gutters and trims as well as walls. Each joint between different materials moves in its own way, so the sealant has to cope with that.
You are covered for a year from the day we finish. If there’s a problem with it, please call 0345 464 0079 or email us.
- Location
- Dorking (RH4, RH5)
- Wider area
- Surrey
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Surface by surface
Cladding and façade panels
Panels heat up and cool down quickly, so the joint sealant has to cope with frequent movement. The sealant is chosen with that in mind.
Render joints
The face of render can be soft, so a low-modulus sealant is kinder to the joint edges. We prime where the product needs it.
Questions from Dorking
Is Dorking in your area for external mastic?
Yes, Dorking is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or send us an email and tell us what needs doing.
What guarantee comes with external mastic in Dorking?
Every job comes with our 12-month guarantee, wherever it is. We’re fully insured, and an ARBOMaster approved applicator.
How long does external mastic take?
It depends on the size of the job, but most jobs take a few hours for a handful of joints, longer for a whole elevation. We’ll tell you when we quote.
What do you need from me for a quote?
Let us know what needs doing and where, with pictures by email if possible. We will ask anything else we need to know.
Can you seal over the old sealant?
No, it won’t last. It may look fine at first, but the new layer lifts away from the old one. The old sealant has to come out completely.
Should I point up the gap in my brickwork?
No. Mortar locks the joint solid, so the wall cracks somewhere else instead. It needs a flexible sealant over backing rod.
Will the new joint stand out?
Exterior sealants are made in a range of colours, from greys and browns to whites and stone shades. We pick the one that suits your wall best.
How long should I leave it?
Cure times vary by product. We tell you how long to leave it before we go.
Signs you need external mastic in Dorking
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.
These are the problems we are asked about most:
- Movement joints filled with mortar instead of sealant
- Joints where the bead has come unstuck
- Weathered mastic that no longer stretches
- Moss and dirt in joints with no sealant left
If you let a flat or house near Dorking Deepdene station, outside joints that have cracked can let damp into a rental, so check them between lets.
Before you book anyone
- Whether all the old sealant comes out first
- What preparation is included
- Whether the sealant suits the joint
- What happens if the job turns out different
Outside joints around Dorking
With historic houses such as Polesden Lacey (about 2.7 miles north-west) nearby, there’s older building stock in the area around Dorking as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you live in an older home near Church of St Paul, older walls, gutters and the joints where extensions meet them need a flexible sealant. For site and facilities teams at buildings such as St Paul's CofE (Aided) Primary School, larger buildings have long runs of movement joint that eventually need resealing.
Dorking is about 10 miles north-west of Crawley, in Surrey. Whether you’re in the middle of Dorking or further out, external mastic is available for homes and businesses alike. Our area takes in 395 places across Surrey. You can also see our page for Crawley, about 10 miles away.
Our applicators cover all of RH4 and RH5 for external mastic. External mastic is available to properties on High Street, Station Road and London Road. Main roads around Dorking include the A24 and A25, which makes travel easy. Nearby, we also carry out external mastic in Pixham (1 mile north-east), North Holmwood (1 mile south), Westhumble (2 miles north), Westcott (2 miles west) and Blackbrook (2 miles south-east). We also work in nearby towns such as Guildford (11 miles west), Woking (12 miles north-west), Epsom (8 miles north), Horley (8 miles south-east), Redhill (7 miles east) and Ewell (9 miles north).
Local landmarks in Dorking
Around Dorking, our work takes us to homes and buildings near The Wheatsheaf Public House, The Ashcombe School and Deepdene Terrace and the streets around them. Nearby too are The Ashcombe School (0.6 miles north) and Pippbrook House (0.5 miles north). Dorking’s nearest station is Dorking Deepdene station, roughly 0.6 miles north. A little further out are Mesolithic Museum (3.9 miles south-west) and Headley Court (4.8 miles north-east). Open spaces near Dorking include Reigate Heath and Box Hill.
Quotes for external mastic in Dorking
Your quote is based on your job. We take into account:
- Any mould that needs treating
- The number and length of the joints
- How much old sealant there is and how hard it is to remove
- The type of sealant required
The cost depends on the amount of work, how much old material has to come out and access to the work. You will have a clear quote before any work starts, so you know where you stand.
Asking for a quote
To make quoting easier, let us know:
- Where the job is, and your postcode
- Access, such as stairs, a lift or height
- The problem you’ve noticed
- How many joints, rooms or windows are involved
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email photos if that is easy.
Also in Dorking
Aftercare tips
To keep the joints looking good and working properly:
- Fix overflowing gutters above sealed joints
- Show decorators and builders where the movement joints are
- Avoid pressure-washing directly into sealant joints
- Act on the first splits you see
Don’t paint over the new sealant unless we’ve said the product is paintable. Paint can crack on a flexible joint.
Small splits are the time to act. Then it’s a straightforward cut-out and reseal before water has had years to get in.
What we do, step by step
We work through the job in order: protect, prepare, seal, tidy. For most jobs that takes a few hours to a few days, depending on the length of joint and the access and we leave things clean and tidy. In Dorking, parking is rarely complicated, though it helps to know about driveways or restrictions, and mention if the work is upstairs, in a flat or high on the outside.
- First we look over the joints with you, agree which to renew and talk through access.
- The old mastic and anything lodged in the joint is removed.
- Both sides are cleaned back to sound material and primed if needed.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
How to prepare
- Tell us about any previous sealing or DIY attempts
- Tell us about access, such as stairs, a lift or high-level joints
- Keep children and pets away from the work area
How to get a quote
Call for a quick quote, or email us if that’s easier. Describe what needs sealing and we’ll talk you through the work before giving you a price.
Advice
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.
Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.