Surrey · England
Keeper's Corner External Mastic
External mastic for Keeper's Corner, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Joints where the bead has come unstuck
- Movement joints filled with mortar instead of sealant
- Rain getting behind render or cladding at a joint
Keeper's Corner buildings and the weather
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Saint Hill Manor (about 4.8 miles south-east) nearby, there’s older building stock in the area around Keeper's Corner as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
Letting a property close to Gatwick Airport station? Then outside joints that have cracked can let damp into a rental, so check them between lets. In the older streets around Church of St Bartholomew, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Keeper's Corner is about 3 miles south-east of Horley, in Surrey. For external mastic in and around Keeper's Corner, please phone 0345 464 0079 or email us for a quick quote. We cover Surrey from our Crawley base. 395 places in Surrey are on our list, large and small.
Here we cover the RH6 and RH10 postcode area for external mastic. You will find streets such as Effingham Road and Redehall Road. With the B2037 close by, Keeper's Corner is easy for our applicators to reach. If you are just outside Keeper's Corner, we cover Burstow (1 mile west), Shipley Bridge (1 mile west), Copthorne (1 mile south-west), Fernhill (1 mile west) and Smallfield (1 mile north). Within a short drive, we also cover Epsom (14 miles north-west), Horley (3 miles north-west), Redhill (6 miles north-west), Ewell (15 miles north-west), Reigate (7 miles north-west) and Caterham (9 miles north).
Local landmarks in Keeper's Corner
Around Keeper's Corner, our work takes us to homes and buildings near The Curious Pig in the Parlour pub and Oakwood School. The closest station to Keeper's Corner is Gatwick Airport station, roughly 2.3 miles west of the centre. A little further out are Langley Green Hospital (3.9 miles west) and Effingham Park Motor Museum (1.1 miles south-east). Open spaces near Keeper's Corner include Hedgecourt Lake.
External mastic in Keeper's Corner
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Some surfaces need a primer before sealing. If you have joints pointed up with cement by mistake and weeds or debris growing in open joints, we can help.
External sealant needs dry, clean surfaces, so work around Keeper's Corner is planned for dry weather. Tell us about access to all sides of the building, including outbuildings and garages.
You are covered for a year from the day we finish. If anything is not right with it, call 0345 464 0079 or email us.
- Location
- Keeper's Corner (RH6, RH10)
- Region
- Surrey
- Guarantee
- A year, on every job
- Quote
- A clear price before work begins
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What we are called out for in Keeper's Corner
UV, rain and frost all age exterior sealant. In time it goes hard, crazes on the surface and stops stretching, so the joint eventually tears or comes away from one side.
It’s worth asking for a quote if you see:
- Cracked joints where brick meets render or frames
- Weathered mastic that no longer stretches
- Water getting into walls through failed joints
- Sealant pulling away from one side of the joint
For site and facilities teams at buildings such as Copthorne CofE Junior School, larger buildings have long runs of movement joint that eventually need resealing.
Questions to ask before you book
- Who does the work, and how experienced they are
- Whether the sealant suits the joint
- How the joint is cleaned and prepared
- How long the guarantee is
Work for landlords, hotels and businesses
Landlords and letting agents in Keeper's Corner can book us as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order before the next move-in.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance.
Common questions in Keeper's Corner
I let a flat near Gatwick Airport station. Can you help?
Yes, we work for landlords and letting agents. Just phone 0345 464 0079 or email us and tell us about the property, and we will send you a clear quote.
Will you come out to Keeper's Corner?
Yes, Keeper's Corner is covered. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Can you reach joints on upper floors?
It depends on the building. We work on joints that can be reached safely. Give us some details and we’ll confirm the access.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status.
Do you guarantee your work?
Yes. All our work carries our one-year guarantee.
What’s an expansion joint in brickwork?
Most straight vertical gaps in brickwork are movement joints. It lets the bricks expand without cracking.
How long does external mastic last?
It depends on the exposure, the movement and the product. Treat it as a maintenance item and look at it yearly and renew it when it starts to fail.
What is backing rod for?
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.
What we cannot put right
We’d rather tell you now than do work that will not last, so these are the limits:
- Walls that need new movement joints cut into them
- Movement that is more than a sealant joint can take
- Damp that is not coming from the joint
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly before booking.
What we seal
- Render & cladding joints
- Joints between brick and frames
- Concrete & block
- Copings & trims
- Façade panels
- Brickwork movement joints
Quotes for external mastic in Keeper's Corner
Call for a quick quote. What matters most is:
- The size of the job
- Any working-time requirements on site
- Whether old sealant or filler has to be cut out
- Whether there’s mould to deal with
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
Asking for a quote
To help us quote quickly, let us know:
- If someone has resealed it before
- Whether it’s a home or a business
- The problem you’ve noticed
- The address or postcode of the job
For a quick quote, get us on the phone, or email us if that is easier. Describe what needs sealing and we will talk you through the work and give you a clear price.
Towns and villages near Keeper's Corner
Also in Keeper's Corner
How it works
When we get to you, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. Most jobs then take anything from a few hours to several days, depending on the building. In a small place like Keeper's Corner, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First, the joints are inspected and the access agreed.
- 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.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- Tell us about any water getting in
- On commercial sites, let us know about site rules
- Move anything stored near the joints
Ask for a quote
If you’re in Keeper's Corner and need external mastic, ring 0345 464 0079 or email us. Tell us what the problem is and where, and you’ll get a clear quote before any work starts.
Advice
Aftercare tips
Looking after new joints is easy, and it makes a real difference:
- Keep high-pressure jets off the joints
- Do not let climbing plants root in the sealant
- Point out the joints to other trades
- Check external joints each spring
Have a quick look at the joints each spring. Watch for splits, edges coming away or growth in the joint.
Once a joint can’t move, the wall finds another way, often as cracks near the joint. Catch it early and you reduce the risk.
Different surfaces, different methods
Cladding and façade panels
If the façade has a specified sealant, that is what we use, or one the system allows. Send us any details you have about the façade.
Brickwork movement joints
Clay brickwork grows slightly over its life and moves with the weather. That movement goes into the joint, so the sealant in it must stay soft and stretchy.