Kent · England
Henhurst External Mastic
Specialist external mastic for Henhurst: careful preparation, the right product and tidy work. Call for a quick quote.
- Joints where the bead has come unstuck
- Old sealant gone brittle and cracked
- Joints with sealant missing in places
About our external mastic in Henhurst
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible sealant bridges the two where mortar or filler would crack. If you have hard, crazed mastic that has stopped moving and water getting into walls through failed joints, we can help, whatever the surface.
External sealant needs dry, clean surfaces, so work around Henhurst is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
The work is covered for a year after we finish. If anything is not right with it, ring 0345 464 0079 or email us.
- Where
- Henhurst (DA12)
- Region
- Kent
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Wash walls gently around the sealant
- Have failed joints looked at early
- Deal with leaking gutters that soak the joints below
- Check the sealant is paintable before painting near it
Make sure anyone working on the wall later knows where the movement joints are. They must stay as flexible joints, never rendered or pointed over.
Water getting behind cladding or render can go unnoticed for a long time. By the time there’s a damp patch, the damage can be well established.
Should I try it myself first?
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Henhurst buildings and the weather
Historic houses like Cobham College (about 1 mile south-east) are a reminder that the area around Henhurst has older buildings as well as new. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For site and facilities teams at buildings such as Singlewell Primary School, its movement joints, gutters and trims need looking after like any other building’s. Rented homes near Sole Street station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets. For an older house near a landmark such as Church of St Margaret, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Henhurst is about 2 miles south of Gravesend, in Kent. For external mastic in and around Henhurst, it’s easy to get a quote: please ring 0345 464 0079 or email us. We cover Kent from our Crawley base, Henhurst included. Our area takes in 922 places across Kent, from the larger towns to small villages. For nearby work, see our London page (22 miles or so).
Work in DA12 works the same way as everywhere else we cover. Neighbouring places we cover for external mastic include Singlewell or Ifield (1 mile north-west), Istead Rise (1 mile west), Gravesend (2 miles north), Denton (2 miles north) and Northfleet Green (2 miles north-west). We also work in nearby towns such as Maidstone (11 miles south-east), Dartford (8 miles west), Sevenoaks (12 miles south-west), Tonbridge (15 miles south), Northfleet (3 miles north-west) and Swanley (9 miles west).
What’s near Henhurst
Locally, jobs take us to homes and businesses close to Jeskyns, The George Inn and Thamesview School and the streets around them. For rail, the closest station is Sole Street station, about 1.3 miles south of the centre. Other landmarks nearby include Gravesham Museum (2.8 miles north) and Gravesham Community Hospital (3 miles north). Open spaces near Henhurst include Sawyers Lake and Gad's Hill.
Common questions in Henhurst
Do you work for landlords with property near Sole Street station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or send us an email and tell us about the property, and we will send you a clear quote.
Do you cover smaller places like Henhurst?
Yes, Henhurst is covered. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Do you have insurance?
Yes, we are fully insured for domestic and commercial work.
What should I tell you?
Just the basics: the address or postcode, what’s wrong and any access issues. Then ring 0345 464 0079 or drop us an email.
Do you seal joints where cladding meets other materials?
Yes. Materials like render, brick, metal and uPVC all move differently, so a flexible sealant is needed where they meet. The sealant is matched to both sides.
How much does external mastic cost in Henhurst?
We do not publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
What is backing rod for?
Backing rod controls the sealant depth and keeps it off the back of the joint. Then the sealant bonds to two faces and can move.
Where do you work from?
Mr Mastic is based in Crawley. We cover Henhurst and the rest of Kent, along with the rest of our area.
How we quote for external mastic
The quote reflects the job in front of us. We look at:
- The old material and how stubborn it is
- The product the joint needs
- How easy the joints are to reach
- How many areas need sealing
What it costs depends on the size of the job, how much old material has to come out and access to the work. We give a clear quote before work begins.
What we need to know
You don’t need to know the technical terms. Just tell us:
- Photos by email, if that is easy
- Any previous sealing or DIY work
- Any access issues, like height or stairs
- What’s wrong with the joints now
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is. When it suits you, phone 0345 464 0079 or email us.
What we cannot put right
In fairness, some problems need a different trade:
- Render that is blown, hollow or coming away
- Damp that is not coming from the joint
- Adding movement joints to masonry that has none
If you’re not sure, just call 0345 464 0079 or send us an email and we’ll give you a straight answer.
What we seal
- Façade panels
- Concrete & block
- Joints between brick and frames
- Render & cladding joints
- Brickwork movement joints
- Copings & trims
Work for landlords, hotels and businesses
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
Nearby places to Henhurst
Other services in Henhurst
Surface by surface
Brickwork movement joints
Brick movement joints are often mistaken for a missing mortar line. If that’s happened, we rake it out and reseal it properly if the joint can be cleared.
Copings and trims
A failed coping joint lets water into the top of the wall. Resealing them is a small job that protects a lot.
The process
At the end, we look at the finished work together and explain the cure time. The visit itself normally takes a few hours to a few days, depending on the length of joint and the access, depending on the size of the job. Somewhere as small as Henhurst, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
How to prepare
- For indoor joints, keep the area dry beforehand if you can
- Let us know about earlier repairs to the joints
- For business premises, tell us about site rules or sign-in
Get a quote
To get a quote, call 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. You will have a clear quote before any work starts.