Surrey · England
External Mastic in Brockham
External mastic in Brockham from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Damp patches traced to an open external joint
- Leaking joints around cladding and façade panels
- Joints where the bead has come unstuck
Do you need external mastic in Brockham?
Every building moves. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. The sealant in the movement joints takes that strain.
It’s worth asking for a quote if you see:
- Sealant that has lost its bond to the brick or render
- Rain getting behind render or cladding at a joint
- Movement joints with cracked, split or missing sealant
- Panel joints letting water in
For site and facilities teams at buildings such as North Downs Primary School, larger buildings have long runs of movement joint that eventually need resealing.
Questions to ask before booking
- How long the guarantee is
- What product goes in the joint
- How the joint is cleaned and prepared
- What insurance they hold
External mastic in Brockham, done properly
Movement joints let brickwork, render and cladding expand and shrink without cracking. 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 are often asked to deal with rigid filler in a joint that should flex and sealant pulling away from one side of the joint, on concrete & block, brickwork movement joints and joints between brick and frames.
Somewhere as small as Brockham, homes and farm buildings often face open ground, where walls and rooflines take the weather head on. Joints on those walls need a sealant that moves with the building and stays in place.
Whatever the size of the job, you get the same 12-month guarantee.
- Where
- Brockham (RH3)
- Region
- Surrey
- Cover
- One year on every job
- Quote
- A clear price before work begins
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Also near Brockham
What else we do in Brockham
Different surfaces, different methods
Concrete and blockwork
Big joints in concrete need careful depth control. We size the backing rod to the gap so the sealant isn’t too deep.
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. They’re resealed over backing rod with a low-modulus sealant in a colour to suit the brick.
FAQs for Brockham
Is Brockham in your area for external mastic?
Yes. Our work covers London and the South East, and Brockham is part of that. You can ring 0345 464 0079 or send us an email and let us know what needs doing, and we will send you a clear quote.
Will you come out to Brockham?
Yes. Brockham is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Will the new joint stand out?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We pick the one that suits your wall best.
Will there be a smell?
That depends on the sealant. Some products have a noticeable smell, others very little.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator.
Can I do it myself?
It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
Is there a guarantee?
Yes. There’s a 12-month guarantee on every job.
Do you work for landlords and businesses?
Yes. Domestic, commercial and hotel work are all part of what we do.
How it works
We work through the job in order: protect, prepare, seal, tidy. Typically it takes anything from a few hours to several days, depending on the building. Somewhere like Brockham needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We start by walking round the building and agreeing the joints and the access.
- 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.
- Backing rod sized to the joint goes in to set 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
- Mention any tricky access
- Keep children and pets away from the work area
Getting a quote
We quote each job on its own, so start by telling us what you need. Just ring 0345 464 0079 or send us an email with the details.
Related advice
For landlords and businesses
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we will quote.
Brockham buildings and the weather
Historic houses like Polesden Lacey (about 4.2 miles west) are a reminder that the area around Brockham has older buildings as well as new. Where a home is older, 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, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Rented homes near Betchworth station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies. Homes close to Christ Church include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain.
Brockham is about 2 miles east of Dorking, in Surrey. Our applicators cover external mastic for householders, landlords and businesses in Brockham and nearby, as part of our work across Surrey. Brockham is one of 395 places in Surrey where we work. You can also see our page for Crawley, about 9 miles away.
Postcode districts we cover here for external mastic: RH3. Local streets include Holly Close, Nutwood Avenue and Kiln Lane, and we cover them all. Other places close to Brockham include Betchworth (1 mile north-east), Strood Green (1 mile south), Box Hill (1 mile north), Buckland (1 mile east) and Bunce Common (2 miles south). Further out, we also cover Guildford (13 miles west), Woking (14 miles north-west), Epsom (7 miles north), Horley (6 miles south-east), Redhill (5 miles east) and Ewell (8 miles north).
Local landmarks in Brockham
In Brockham, that means homes and buildings near The Ashcombe School, Pippbrook House and Inn on The Green, among other places. For rail, the closest station is Betchworth station, about 1.1 miles north-east. A little further out are Reigate Priory Museum (3.3 miles east) and Headley Court (3.9 miles north). The countryside around Brockham includes Reigate Heath and Box Hill.
What affects the cost of external mastic
We quote each job individually. This is what makes a difference:
- The old material and how stubborn it is
- The number and length of the joints
- Access and height
- Mould in or behind the old joints
A few things move the cost up or down: the old material and how easily it comes out, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
Asking for a quote
Photos help, but a description is a good start. Try to tell us:
- Pictures of the joints, sent by email
- The problem you’ve noticed
- The rough size of the job
- Where the property is
Asking for a quote is easy: let us know what needs doing and where, and roughly how big it is. A few pictures by email make the job easier to understand, and we’ll come back to you with a quote.
Honest limits
Sealant isn’t the answer to every problem, and we’d rather say so up front. It won’t solve:
- Render that’s blown, hollow or coming away
- Damp that is not coming from the joint
- Cracked brickwork or render that needs a builder or plasterer
If you are not sure, just ring 0345 464 0079 or send us an email and we’ll give you a straight answer before you book.
What we seal
- Concrete & block
- Copings & trims
- Joints between brick and frames
- Brickwork movement joints
- Façade panels
- Render & cladding joints
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Keep high-pressure jets off the joints
- Ask before painting over external sealant
- Clear growth from the base of walls and joints
- Check external joints each spring
Keep the joints clear of soil, plants and climbing growth. Anything that holds water against the joint wears it out sooner.
Gaps, plants or missing sealant in a joint are worth getting looked at. Early work is quicker and leaves a better finish.