Surrey · England
External & façade joints in Blackheath, Surrey
Problem with your movement joints in Blackheath? We cut out the old, prepare the joints and apply the right sealant.
- Failed seals between different materials
- Joints pointed up with cement by mistake
- Failed sealant between panels on a façade
External mastic in Blackheath, done properly
Ground-floor and low-level joints are straightforward to reach. For joints higher up, give us some details of the building and we will confirm what access is needed. If you are dealing with moss and dirt in joints with no sealant left and movement joints filled with mortar instead of sealant, we can put it right, whatever the surface.
Outside joints can only be sealed when they’re dry, so work in Blackheath is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
Your job is guaranteed for a year, as with all our work.
- Place
- Blackheath (GU4)
- Region
- Surrey
- Cover
- A year, on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Questions from Blackheath
Do you work for landlords with property near Chilworth station?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or email us and tell us about the property, and we will give you a clear price.
Is Blackheath in your area for external mastic?
Yes, Blackheath 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, and we will give you a clear quote.
What information do you need?
Where the job is, what the problem is and roughly how big it is. If you can, email a few photos.
Is there any odour?
There can be a smell while the sealant cures. Ventilation helps.
Will the old sealant be removed?
Yes, always, and completely. New sealant won’t bond properly to old, so the joint is cleaned back first.
How long does external mastic last?
There’s no fixed answer: joints on exposed walls or with a lot of movement age sooner. Check them each year and reseal when they split or harden. Our work comes with a 12-month guarantee.
Is there a guarantee?
Yes, for a year. If anything isn’t right with the work within the year, let us know and we’ll sort it.
Do you seal joints where cladding meets other materials?
Yes. Where different materials meet is one of the most common joints we seal. The sealant is chosen to bond to both sides.
How to look after the new joints
Looking after new joints is easy:
- Ask before painting over external sealant
- Check external joints each spring
- Wash walls gently around the sealant
- Point out the joints to other trades
Make sure anyone working on the wall later knows where the movement joints are. They should be kept open and resealed, not filled.
Small splits are the time to act. Then it’s a straightforward cut-out and reseal.
Blackheath buildings and the weather
Historic houses like Chilworth Manor (about 1.1 miles north) are a reminder that the area around Blackheath 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. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Rented homes near Chilworth station change hands often, and split movement joints are easy to miss on a rental until damp shows inside. If you live in an older home near Church of St Martin, an extension built onto an older house moves differently, and the joint between them takes the strain.
Blackheath is about 4 miles south-east of Guildford, in Surrey. Wherever you are in the GU4 postcode area, we can carry out external mastic at your property. Our area takes in 395 places across Surrey, large and small. We also work in Crawley, around 16 miles away.
We cover every part of GU4 for external mastic and the streets around it. Nearby, we also carry out external mastic in Chilworth (1 mile north-west), East Shalford (2 miles north-west), Shalford (2 miles west), Broadford (2 miles west) and Peasmarsh (3 miles west). Further out, we also cover Guildford (4 miles north-west), Woking (8 miles north), Camberley (13 miles north-west), Epsom (14 miles north-east), Horley (15 miles east) and Farnham (12 miles west).
What’s near Blackheath
Locally, jobs take us to homes and businesses close to The Percy Arms. The closest station to Blackheath is Chilworth station, about 0.6 miles north of the centre. Nearby you will also find Guildford Castle (2.9 miles north-west) and Shere Museum (2.8 miles east). Green spaces nearby include St Martha's Hill and St Martha's Hill and Colyer's Hanger.
Also in Blackheath
What we do, step by step
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. Most jobs then take a few hours to a few days, depending on the length of joint and the access. For a village or hamlet like Blackheath, the journey is planned in advance: 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 look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Before we arrive
- Plan for the work area to be out of bounds to pets and children
- Let us know about stairs, lifts or work at height
- On commercial sites, let us know about site rules
Ask for a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that’s easy.
Advice
Landlord and commercial work in Blackheath
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
If you manage several properties in or around Blackheath, jobs at different addresses can be quoted together. Send us the addresses and the work at each.
When it is not the sealant
Some problems need a builder, plumber or other trade rather than us:
- Failed render or damaged cladding panels
- Cracked brickwork or render that needs a builder or plasterer
- Cutting new joints into brickwork, which is building work rather than sealant work
If in doubt, call 0345 464 0079 or email us and we’ll say what we think.
Surfaces we seal
- Joints between brick and frames
- Brickwork movement joints
- Façade panels
- Copings & trims
- Concrete & block
- Render & cladding joints
Why act early in Blackheath
The longer a joint stays open, the more water the wall takes in. Wet masonry is more easily damaged by frost, so the problem grows beyond the joint itself. In a small place like Blackheath, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part.
Why Blackheath customers choose us
- An ARBOMaster approved applicator
- Anti-fungal silicone where joints get wet
- Colour picked to suit the job
- A 12-month guarantee on all work
Can I do it myself?
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
Common problems we fix in Blackheath
Many joints fail because they were sealed too deep or with nothing behind them. If the sealant sticks to the back as well as the sides, it cannot stretch and tears as soon as the joint widens.
The most common problems we see are:
- Water getting into walls through failed joints
- Brick movement joints where the sealant has split
- Panel joints letting water in
- Joints pointed up with cement by mistake
Managing a site like Chilworth CofE (Aided) Infant School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Comparing quotes
- Is the old sealant removed completely?
- Whether the sealant suits the joint
- How long to leave it before use
- How the joint is cleaned and prepared