Surrey · England
External & façade joints in Farnham, Surrey
Sealing brickwork movement joints, render, cladding and façade joints in Farnham, with a one-year guarantee on every job. Ask us for a quote.
- Gaps where render, brick and frames meet
- Moss and dirt in joints with no sealant left
- Water getting into walls through failed joints
Can I do it myself?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
External mastic in Farnham
A movement joint is only as good as its depth. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, so it bonds to the two sides only and can stretch. We work on façade panels, render & cladding joints and concrete & block, and the jobs we see most are movement joints filled with mortar instead of sealant and weeds or debris growing in open joints.
Extensions are a common sight on houses around Farnham, and the joint where new wall meets old is a classic place for water to get in. Getting the joint depth right matters as much as the sealant itself.
Your job is guaranteed for a year, as with all our work.
- Where
- Farnham (GU9, GU10)
- Region
- Surrey
- Cover
- One year on every job
- Quotes
- A clear price before we start
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Your questions about external mastic in Farnham
Is there a guarantee on external mastic in Farnham?
Every job comes with our one-year guarantee, wherever it is. We’re also fully insured and ARBOMaster approved.
Do you cover Farnham for external mastic?
Yes. We work across London and the South East, and Farnham is part of that. You can call 0345 464 0079 or send us an email and tell us what needs doing.
Do the sealants smell?
It depends on the product. Some products have a noticeable smell, others very little, and any smell fades as they cure.
Do I need to be at home?
That depends on where the joints are. For work indoors, someone needs to let us in.
Should I point up the gap in my brickwork?
No. Mortar locks the joint solid, so the movement cracks the wall elsewhere. Use a flexible sealant with backing rod.
Will it make a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
Are you insured?
Yes. We are fully insured.
Can new sealant go over the old?
No. The old sealant always comes out first, so the new sealant bonds properly.
When something else is needed
To be straight with you, there are a few things sealant will not fix:
- Cracked brickwork or render that needs a builder or plasterer
- Subsidence or other structural problems
- Failed render or damaged cladding panels
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we’ll tell you honestly before booking.
Surfaces we seal
- Render & cladding joints
- Copings & trims
- Brickwork movement joints
- Façade panels
- Concrete & block
- Joints between brick and frames
Common problems we fix in Farnham
Many joints fail because they were sealed too deep or with nothing behind them. Sealant bonded to three sides has nowhere to go and tears as soon as the joint widens.
These are the problems we are asked about most:
- Panel joints letting water in
- Failed seals between different materials
- Hard, crazed mastic that has stopped moving
- Weeds or debris growing in open joints
In the older streets around St Joan of Arc's Church, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Before booking anyone
- Whether VAT is included
- Is the old sealant removed completely?
- What the cure time is
- What preparation is included
Why deal with it now?
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That matters on brick, render and concrete, which can be weaker at the face. A stiffer product can damage the joint edge as it fails. Gaps in sealant and mould in the bead never get better on their own, and in a busy home in Farnham they get worse with every use. Replacing the sealant now is the simplest fix.
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you’re unsure, call 0345 464 0079 or email us for an honest opinion and a quote.
Why Farnham clients choose us
- Colour agreed with you before we start
- Neat joints and a tidy finish
- Fully insured
- Old sealant always removed completely
See what affects the cost and our reviews.
Landlords, agents and businesses in Farnham
We work for landlords and agents as well as homeowners. Resealing between tenancies keeps a property looking cared for.
We also work for property managers and facilities teams. We can quote a run of properties together, and we are fully insured.
Walls and rooflines in Farnham
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. With historic houses such as Farnham Castle (about 0.6 miles north-west) nearby, there’s older building stock in the area around Farnham as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
Schools such as Farnham College are buildings too, and larger buildings have long runs of movement joint that eventually need resealing. Rented homes near Farnham station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets.
Farnham is about 6 miles south of Farnborough, in Surrey. Every kind of property in Farnham can book us for external mastic, old or new, large or small. Every job comes with our 12-month guarantee. Our Surrey coverage runs to 395 places, and Farnham is one of them. There’s also a page for Reading, about 18 miles away.
Our applicators cover all of GU9 and GU10 for external mastic. If you need external mastic at a property on Barncroft, Approach Road and Saxon Croft or a nearby road, our applicators can take on the job. Farnham is on the A31 and A287, so it’s easy for us to get to. We also cover the places around Farnham: Compton (1 mile east), Hale (1 mile north), Upper Hale (2 miles north), Runfold (2 miles east) and Heath End (2 miles north). We also work in nearby towns such as Guildford (10 miles east), Woking (12 miles north-east), Camberley (9 miles north), Frimley (8 miles north), Haslemere (9 miles south) and Cranleigh (14 miles east). Farnham is among the bigger towns we cover in Surrey.
Around Farnham
Locally, jobs take us to homes and businesses close to Moor Park, William Cobbett Public House and Weydon School and the streets around them. Farnham has its own railway station: Farnham station. Nearby you’ll also find Museum of Farnham (less than half a mile north-west) and Farnham Castle (0.6 miles north-west). Open spaces near Farnham include Farnham Park and Aunt's Pool.
What we do, step by step
Once we are on site, 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. In Farnham, parking is rarely complicated, though it helps to know about driveways or restrictions, and let us know if the work is upstairs, in a flat or up high outside.
- 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.
How to prepare
- Mention any leaks or damp you’ve noticed
- Let us know about earlier repairs to the joints
- Let us know about parking restrictions
Getting a quote
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.
Related advice
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Also in Farnham
Different surfaces, different methods
Render joints
Render is weaker at the surface than brick, so a sealant that stretches easily protects the edges. Priming is done where the sealant calls for it.
Cladding and façade panels
Where a cladding system has its own specified sealant, we follow it or an approved alternative. Tell us what the building has when you get in touch.