Surrey · England
External Mastic in Shortheath
Professional external mastic in and around Shortheath, with every bit of old sealant taken out first and a one-year guarantee.
- Gaps where render, brick and frames meet
- Movement joints with cracked, split or missing sealant
- Plants rooting in failed movement joints
How the visit works
Every visit runs the same way: we look at the joints together, mask and protect the surrounding surfaces, carry out the job and tidy away. Most jobs take anything from a few hours to several days, depending on the building. For a village or hamlet like Shortheath, 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.
- First we look over the joints with you, agree which to renew and talk through access.
- We cut out the failed sealant and rake out any dirt or growth.
- Both sides are cleaned back to sound material and primed if needed.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Before we arrive
- Mention if the joints have been sealed before
- Tell us if parking is tricky
- Clear items away from the joints we are working on
Ask for a quote
Need a quote? Please call 0345 464 0079 or email us and tell us about the job. We’ll explain what we’d do and give you a clear quote before work begins.
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About our external mastic in Shortheath
Short cuts in external joints show up within a season or two. New sealant over old, joints packed with mortar and beads with no backing all tend to fail early. We take the old material out and do it properly. Common call-outs are for rigid filler in a joint that should flex and movement joints with cracked, split or missing sealant, on brickwork movement joints, copings & trims and façade panels.
Older homes in small places like Shortheath may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water normally gets in.
The work is covered for a year after we finish. If anything isn’t right with it, phone 0345 464 0079 or drop us an email.
- Where
- Shortheath (GU9, GU10)
- Region
- Surrey
- Guarantee
- 12 months on all our work
- Quote
- A clear price before work begins
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What the job involves on each surface
Brickwork movement joints
Brick movement joints are often mistaken for a missing mortar line. Where one has been mortared, we cut it out and reseal it with sealant where it can be done safely.
Joints between dissimilar materials
Different materials may need different primers. We prepare both faces so the sealant bonds properly.
Questions from Shortheath
Do you cover smaller places like Shortheath?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
I let a flat near Farnham station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just phone 0345 464 0079 or email us with the address and what needs doing, and we will send you a clear quote.
How much does external mastic cost in Shortheath?
We don’t publish prices, because the cost depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Do you take out the old sealant first?
Yes, always, and completely. New silicone doesn’t stick to old silicone, so the joint is cleaned back first.
Can you seal joints between two different materials?
Yes. Where different materials meet is one of the most common joints we seal. We use a flexible sealant suited to both surfaces with primer where required.
Is it OK to seal over old sealant?
No. New silicone will not bond to old silicone, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
Where is Mr Mastic based?
Our base is in Crawley, and we cover South East England, London and all of Scotland.
Do you use backing rod?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. Then the sealant bonds to two faces and can move.
How we quote for external mastic
Jobs vary more than people expect. The main factors:
- Any working-time requirements on site
- The old material and how stubborn it is
- The amount of work
- How many rooms, windows or areas are involved
Doing several joints on one visit usually makes better use of the time than several visits, so tell us about everything that needs sealing. We will give you a clear quote for the lot.
What we need to know
To make quoting easier, let us know:
- Any previous sealing or DIY work
- Where the job is, and your postcode
- What the problem is, such as mould, gaps, leaks or cracking
- Roughly how big the job is
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we’ll explain what’s involved.
Nearby places to Shortheath
Also in Shortheath
What we are called out for in Shortheath
Weeds, moss and debris in a joint are a sign the sealant has gone. Dirt and roots then trap moisture in the joint and make things worse.
Look out for these signs:
- Cracked joints where brick meets render or frames
- Moss and dirt in joints with no sealant left
- Joints pointed up with cement by mistake
- Damp patches traced to an open external joint
For an older house near a landmark such as St Peter's Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
Before you book anyone
- How long the guarantee is
- Which colour the sealant will be
- Who does the work, and how experienced they are
- Whether they’re fully insured
Looking after it afterwards
So the new joints stay in good condition:
- Leave the joints unpainted unless we’ve said otherwise
- Never let anyone fill a movement joint with mortar
- Deal with leaking gutters that soak the joints below
- Get split or bare joints resealed while the damage is small
Don’t paint over the new sealant unless we’ve said the product is paintable. Paint can crack on a flexible joint.
Leave a failed movement joint and water keeps getting into the wall. That can lead to damp patches, staining and frost damage, all bigger jobs than a reseal.
Shortheath buildings and the weather
With historic houses such as Farnham Castle (about 1.6 miles north) nearby, there’s older building stock in the area around Shortheath 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, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Letting a property close to Farnham station? Then outside joints that have cracked can let damp into a rental, so check them between lets. Schools such as St Peter's CofE Primary School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s.
Shortheath is about 1 mile south-west of Farnham, in Surrey. Our applicators cover external mastic for homeowners, landlords and businesses in Shortheath. 395 places in Surrey are on our list, from the larger towns to small villages. Reading is on our list too, around 19 miles away.
We work across the GU9 and GU10 postcode area for external mastic and the streets around it. If you need external mastic at a property on Shortheath Road, Little Thurbans Close and Sunnydell Lane or anywhere close by, we can help. Main roads around Shortheath include the B3384, which makes travel easy. Other places close to Shortheath include Wrecclesham (1 mile west), Boundstone (1 mile south), Rowledge (1 mile south-west), Holt Pound (1 mile south-west) and Bucks Horn Oak (2 miles south-west). Larger places within reach include Guildford (11 miles east), Woking (13 miles north-east), Camberley (10 miles north), Frimley (9 miles north-east), Haslemere (8 miles south-east) and Cranleigh (15 miles east).
Local landmarks in Shortheath
Around Shortheath, our work takes us to homes and buildings near The Royal Oak Public House, Weydon School and Weydon School. The closest station to Shortheath is Farnham station, about 1.3 miles north-east. Well-known places in the area include Farnham Castle (1.6 miles north) and Museum of Farnham (1.2 miles north). For a walk, there’s Aunt's Pool and Farnham Heath.
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 getting the depth right matters as much as the look.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Leave it or put it right?
Water gets in through a failed movement joint, behind render and cladding. Dealing with it early keeps the repair to the joint, rather than the wall around it. Where a wall is exposed, as many are in small places like Shortheath, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed. Ask us for a quote and we will go through it with you.
Why book with us
- Every job guaranteed for a year
- ARBOMaster approved applicator
- We are fully insured
- 180+ five-star Google reviews
See our cost guide or our reviews.