Kent · England
Crockham Hill External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for Crockham Hill, backed by a 12-month guarantee. Call for a quick quote.
- Gaps where render, brick and frames meet
- Old sealant gone brittle and cracked
- Joints where the bead has come unstuck
When to call us in Crockham Hill
Many joints fail because they were sealed too deep or with nothing behind them. Sealant bonded to three sides has nowhere to go and rips as the joint opens.
It’s worth asking for a quote if you see:
- Hard, crazed mastic that has stopped moving
- Panel joints letting water in
- Movement joints with cracked, split or missing sealant
- Gaps where render, brick and frames meet
Rented homes near Edenbridge station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets.
Before booking anyone
- What preparation is included
- What happens if the job turns out different
- Whether all the old sealant comes out first
- What insurance they hold
External mastic for homes and businesses in Crockham Hill
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible exterior sealant takes up that movement where mortar or filler would crack. We work on joints between brick and frames, render & cladding joints and concrete & block, and common reasons people get in touch are movement joints filled with mortar instead of sealant and old sealant gone brittle and cracked.
External sealant needs dry, clean surfaces, so work around Crockham Hill is planned for dry weather. Tell us about access to all sides of the building, including outbuildings and garages.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Location
- Crockham Hill (TN8)
- Wider area
- Kent
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
How the visit works
All our tools and materials come with us in the van, so you don’t need to buy or prepare anything. Once we have agreed what’s being done, we protect the area and start. It normally takes a few hours for a handful of joints, longer for a whole elevation. Somewhere as small as Crockham Hill, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- 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.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
Preparing for the visit
- Mention any tricky access
- Mention any sign-in or site rules at work premises
- Plan for the work area to be out of bounds to pets and children
Ask for a quote
Every job is quoted individually, so start by telling us what you need. Just phone 0345 464 0079 or drop us an email with the details.
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Quotes for external mastic in Crockham Hill
For a quick quote, just ask. The main things that affect it are:
- Whether old sealant or filler has to be cut out
- How many areas need sealing
- The type of sealant required
- The amount of work
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
What to tell us for a quote
There’s no need for technical detail. It helps if you can tell us:
- How many joints, rooms or windows are involved
- A few pictures by email, if you can
- The address or postcode of the job
- The problem you’ve noticed
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. When it suits you, ring 0345 464 0079 or email us.
Landlords, agents and businesses in Crockham Hill
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Common questions in Crockham Hill
Is Crockham Hill in your area for external mastic?
Yes, Crockham Hill is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or send us an email and let us know what needs doing, and we will send you a clear quote.
Will you come out to Crockham Hill?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
How long will you be here?
Typically it takes anything from a few hours to several days, depending on the building. Bigger jobs take longer.
What do you put in the joint?
Each joint gets the product that suits it. Movement, water and weather all affect the choice, and we’ll explain our choice.
Will the old sealant be removed?
Yes, every time. New silicone doesn’t stick to old silicone, so any old material comes out before anything new goes in.
Can you quote for more than one area?
Yes, we can. Several rooms, windows or areas can go on one quote.
Do the sealants smell?
There can be a smell while the sealant cures, which fades as it sets. Ventilation helps.
What does external mastic cost?
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.
DIY versus a professional finish
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Leave it or put it right?
The longer a joint stays open, the more water the wall takes in. Wet masonry is more easily damaged by frost around the joint, so the damage spreads beyond the joint. Around Crockham Hill, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
The cost reflects the work involved, not guesswork. That is why we ask about the job first and give you a clear price before any work starts.
Why us?
- A 12-month guarantee on all work
- Quality sealants from Arbo and Everbuild
- Full insurance on every job
- Neat joints and a tidy finish
See what affects the cost and our reviews.
Walls and rooflines in Crockham Hill
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Chartwell (about 1 mile north-east) are a reminder that the area around Crockham Hill 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.
Homes close to Holy Trinity Church include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant.
Crockham Hill is about 6 miles south-west of Sevenoaks, in Kent. From the centre of Crockham Hill to the outskirts, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Crockham Hill is one of 922 places in Kent where we work. For nearby work, see our Crawley page, about 14 miles away.
Postcode districts we cover here for external mastic: TN8. If you need external mastic at a property on Deanery Road, Main Road and Spout Lane or anywhere close by, our applicators can take on the job. We also cover the places around Crockham Hill: Goodley Stock (1 mile north), Pootings (1 mile south-east), Puddledock (1 mile east), The Chart (1 mile north-west) and Troy Town (2 miles south-west). Further out, we also cover Sevenoaks (6 miles north-east), Royal Tunbridge Wells (11 miles south-east), Tonbridge (10 miles east), Swanley (12 miles north-east), Kings Hill (15 miles east) and Paddock Wood (15 miles east).
Landmarks near Crockham Hill
The closest station to Crockham Hill is Edenbridge station, about 1.9 miles south. Other landmarks nearby include Hever Castle (4 miles south-east) and Haxted Watermill Museum (3.4 miles south-west). For a walk, there’s Betsom's Hill and Dryhill Nature Reserve.
Surface by surface
Brickwork movement joints
Brick walls have vertical movement joints to absorb expansion. They’re resealed over backing rod with a low-modulus sealant.
Cladding and façade panels
Panel systems often rely on sealant between and around the panels. We reseal them with a sealant suited to the panel material.