Surrey · England
Longcross External Mastic
External mastic for Longcross, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Damp patches traced to an open external joint
- Gaps where render, brick and frames meet
- Hard, crazed mastic that has stopped moving
External mastic for homes and businesses in Longcross
On houses, flats and commercial buildings across Longcross, we reseal joints in brickwork, render, cladding and façade panels. The preparation is the same whatever the wall: clean joint faces and the right depth. We work on concrete & block, façade panels and joints between brick and frames, and the jobs we see most are damp patches traced to an open external joint and joints where the bead has come unstuck.
External sealant needs dry, clean surfaces, so work around Longcross is planned for dry weather. Tell us about access to all sides of the building, including outbuildings and garages.
We stand behind the work with a 12-month guarantee.
- Location
- Longcross (KT16)
- Region
- Surrey
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Why deal with it now?
The longer a joint stays open, the more water the wall takes in. Wet masonry is more easily damaged by frost near the open joint, so the damage spreads beyond the joint. Where a wall is exposed, as many are in small places like Longcross, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
What you get with us
- Sealant colour chosen to suit
- We agree the colour with you first
- Full insurance on every job
- Tidy, careful work
Take a look at how sealant jobs are priced or our reviews.
Quotes for external mastic in Longcross
There’s no set price list, because no two jobs are the same. What we look at:
- How much there is to do
- Whether old sealant or filler has to be cut out
- Access and height
- The type of sealant required
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote and we’ll talk you through it.
Asking for a quote
To make quoting easier, please include:
- The rough size of the job
- Pictures of the joints, sent by email
- Access, such as stairs, a lift or height
- What’s wrong with the joints now
We quote each job on its own. Just phone 0345 464 0079 or email us with the details and send pictures if you have them.
What external mastic looks like in Longcross
The South East is one of 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 Botleys Mansion (about 2.3 miles east) nearby, there’s older building stock in the area around Longcross as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
Rented homes near Longcross station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Longcross is about 4 miles south-west of Egham, in Surrey. For external mastic in and around Longcross, it’s easy to get a quote: please phone 0345 464 0079 or email us. We cover Surrey from our Crawley base, Longcross included. Our Surrey coverage runs to 395 places, Longcross among them. You can also see our page for Reading, roughly 18 miles from Longcross.
Here we cover the KT16 postcode area for external mastic. If you need external mastic at a property on Longcross Road, Tanglewood Close and Albury Close or anywhere close by, our applicators can take on the job. Nearby, we also carry out external mastic in Trumps Green (1 mile north-east), Stonehill (1 mile south-east), Lyne (2 miles east), Mimbridge (3 miles south) and Ottershaw (3 miles south-east). Larger places within reach include Guildford (9 miles south), Woking (4 miles south), Camberley (7 miles south-west), Epsom (14 miles east), Farnham (15 miles south-west) and Ewell (14 miles east).
Landmarks near Longcross
Typical jobs here are in homes near Gracious Pond and the streets around them. The closest station to Longcross is Longcross station, roughly 0.6 miles north-west. A little further out are St. Peter's Hospital (2.6 miles east) and Chobham Museum (2.2 miles south). Open spaces near Longcross include Virginia Water Lake and St Ann's Hill.
Work for landlords, hotels and businesses
Landlords and agents in Longcross can book us as well as householders. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
If you manage several properties in or around Longcross, several properties can be quoted together. Send us the addresses and the work at each, and pictures by email help.
Do you need external mastic in Longcross?
Joints sealed without backing rod, or far too deep, rarely last. Sealant bonded to three sides has nowhere to go and rips as the joint opens.
The problems people generally mention when they call are:
- Rigid filler in a joint that should flex
- Sealant that has lost its bond to the brick or render
- Damp patches traced to an open external joint
- Moss and dirt in joints with no sealant left
Homes close to Longcross Church include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
What your quote should include
- How long the guarantee is
- Whether VAT is included
- How the surfaces are prepared before sealing
- How hidden problems are handled
What sealant work can’t fix
Sealant isn’t the answer to every problem, and we’d rather say so up front. It won’t solve:
- Walls that need new movement joints cut into them
- Rising or penetrating damp from elsewhere in the wall
- Cracking across the wall rather than at a joint
If you’re not sure, just phone 0345 464 0079 or drop us an email and we’ll give you a straight answer.
What we seal
- Concrete & block
- Brickwork movement joints
- Joints between brick and frames
- Render & cladding joints
- Copings & trims
- Façade panels
How the job changes by surface
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. The movement joint takes that up, so its sealant has to stay flexible.
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. The old joint is removed and a sealant that bonds to both sides goes in.
How it works
There’s no need to move everything out, just the space around the work. We protect the rest, and the work takes anything from a few hours to several days, depending on the building in most cases. Somewhere like Longcross 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.
- 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.
- We clean both faces of the joint and prime them where the product calls for it.
- 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.
How to prepare
- Mention if the joints have been sealed before
- Move anything stored near the joints
- Mention any leaks or damp you’ve noticed
Getting a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. Whenever you are ready, ring 0345 464 0079 or drop us an email.
Related advice
What else we do in Longcross
Longcross questions
Is Longcross in your area for external mastic?
Yes, Longcross is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or email us and tell us what needs doing.
Will you come out to Longcross?
Yes, Longcross is covered. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Can I do it myself?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
Will it make a mess?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
Can you seal joints between render and window frames?
Yes. Joints between dissimilar materials are a big part of external work. We use a flexible sealant suited to both surfaces with primer where required.
Can I add another job to the visit?
Yes, we can. Several rooms, windows or areas can go on one quote.
What is backing rod for?
That is backing rod, a closed-cell foam. It keeps the sealant at the right depth and bonded to the sides only so it can flex with the joint.
Do the sealants smell?
Sometimes, a little. It fades as the sealant cures, and ventilation helps.