Kent · England
External & façade joints in Crockenhill, Kent
Problem with your movement joints in Crockenhill? We remove the old material, prepare the joints and seal them properly.
- Old sealant gone brittle and cracked
- Leaking joints around cladding and façade panels
- Weeds or debris growing in open joints
DIY sealant or a professional job?
If you’ve already had a go yourself, that’s fine. We cut it out and start again, so just mention it when you contact us.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
External mastic for homes and businesses in Crockenhill
We’re ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Porous or awkward surfaces are primed where the sealant needs it, and we don’t skip that step. We work on concrete & block, copings & trims and joints between brick and frames, and the jobs we see most are movement joints with cracked, split or missing sealant and water getting into walls through failed joints.
External sealant needs dry, clean surfaces, so work around Crockenhill is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Location
- Crockenhill (BR8)
- Wider area
- Kent
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Places near Crockenhill
More services for Crockenhill
What external mastic looks like in Crockenhill
Historic houses like Lullingstone Castle (about 2.3 miles south-east) are a reminder that the area around Crockenhill has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. 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.
Schools such as Crockenhill Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing. For an older house near a landmark such as Church of All Souls, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Crockenhill is about 2 miles east of Orpington, in Kent. Every kind of property in Crockenhill can book us for external mastic. Every job comes with our one-year guarantee. Our area takes in 922 places across Kent, large and small. For nearby work, see our London page, about 14 miles away.
Jobs for external mastic in BR8 is quoted and booked the same way as anywhere else. Streets in the area include Church Road, Old Chapel Road and Sounds Lodge, and we cover them all. Nearby, we also carry out external mastic in Kevington (1 mile west), Swanley (1 mile north-east), Well Hill (2 miles south), Derry Downs (2 miles west) and Maypole (2 miles south-west). Further out, we also cover Dartford (5 miles north-east), Sevenoaks (7 miles south), Gravesend (10 miles east), Tonbridge (14 miles south), Northfleet (9 miles north-east) and Kings Hill (13 miles south-east).
Local landmarks in Crockenhill
We work in homes and buildings around Orchards Academy, among other places. The closest station to Crockenhill is Swanley station, roughly 0.8 miles north. Other landmarks nearby include London Borough of Bromley Museum (2.5 miles west) and Orpington Hospital (3.2 miles south-west). Green spaces nearby include The Warren and Summer Hill.
Do you need external mastic in Crockenhill?
UV, rain and frost all age exterior sealant. In time it goes hard, crazes on the surface and stops stretching, so the next time the wall moves, it splits or pulls away.
If you can see any of these, it’s time to have the joints looked at:
- Old sealant gone brittle and cracked
- Joints with sealant missing in places
- Cracked joints where brick meets render or frames
- Weeds or debris growing in open joints
Rented homes near Swanley station change hands often, and split movement joints are easy to miss on a rental until damp shows inside.
Before booking anyone
- What preparation is included
- How long to leave it before use
- What insurance they hold
- How hidden problems are handled
Aftercare tips
Once the sealant has cured, a few habits help it last:
- Clear growth from the base of walls and joints
- Ask before painting over external sealant
- Never let anyone fill a movement joint with mortar
- Keep high-pressure jets off the joints
Have a quick look at the joints each spring. Watch for splits, edges coming away or growth in the joint.
An open movement joint lets rain into the wall every time it pours. That can lead to damp patches, staining and frost damage which cost more to put right than the joint.
What affects the quote in Crockenhill
Call for a quick quote. What matters most is:
- The old material and how stubborn it is
- Working hours on commercial sites
- Which sealant suits the joint
- Access and height
We do not show prices on the website, because each job is priced on what it involves. Call for a quick quote.
Asking for a quote
There’s no need for technical detail. It helps if you can tell us:
- Roughly how big the job is
- Access, such as stairs, a lift or height
- Pictures of the joints, sent by email
- The address or postcode of the job
For a quote, call 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We’ll give you a clear price before any work starts.
How the visit works
On the day, we start by going over the job with you, so there are no surprises. We protect the surfaces around the joints before any work begins. Most jobs take a few hours for a handful of joints, longer for a whole elevation. For a village or hamlet like Crockenhill, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- Old sealant and any debris are cut and raked out.
- 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.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Getting ready for the visit
- Mention any sign-in or site rules at work premises
- Mention if the joints have been sealed before
- Let us know about parking restrictions
Get a quote
Every job is quoted individually, so start by telling us what you need. Simply phone 0345 464 0079 or email us and describe the job and send pictures if you have them.
Read more
Leave it or put it right?
A properly done movement joint is an even line in a colour that suits the wall. A rushed bead with no backing looks untidy and doesn’t last. Where a wall is exposed, as many are in small places like Crockenhill, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
The cost depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before we start, so you know where you stand.
Why book with us
- More than 20 years in sealant work
- Arbo and Everbuild products
- We are fully insured
- White, clear, grey or coloured to suit, where the product allows
Read our cost guide or our reviews.
Questions from Crockenhill
Can you help a landlord with a rental near Swanley station?
Yes. We work for letting agents and landlords as well as householders. Just ring 0345 464 0079 or drop us an email with the address and what needs doing, and we will give you a clear quote.
Can you do external mastic in Crockenhill?
Yes, Crockenhill is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or email us with a few details of the job.
How long does external mastic last?
It varies from wall to wall: joints on exposed walls or with a lot of movement age sooner. A yearly look will tell you when they need doing. Every job carries our 12-month guarantee.
Can new sealant go over the old?
No. New silicone won’t bond to old silicone, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
How long will you be here?
As a guide, most jobs take anything from a few hours to several days, depending on the building. Bigger jobs take longer.
Do you do commercial work?
Yes. We can plan bigger jobs in stages.
Can a movement joint be filled with mortar?
No. Cement or mortar cannot stretch, so the joint stops doing its job. Where a joint has been mortared, it can often be raked out and sealed properly.
Can I add another job to the visit?
Yes, and it often makes sense. Doing several areas at once is generally more efficient.
Surface by surface
Copings and trims
Copings expand and contract through the day, so the joints need a sealant that stays flexible.
Render joints
Render has movement joints and stop beads that need sealing. They’re resealed in a sealant that suits the render.