Kent · England
Harvel External Mastic
External mastic across Harvel and nearby, with every bit of old sealant taken out first and a 12-month guarantee.
- Movement joints with cracked, split or missing sealant
- Water getting into walls through failed joints
- Weathered mastic that no longer stretches
About our external mastic in Harvel
On houses, flats and commercial buildings across Harvel, we reseal joints in brickwork, render, cladding and façade panels. Every joint gets the same careful preparation: clean, sound faces and a controlled depth. We work on brickwork movement joints, concrete & block and render & cladding joints, and people most often call us about cracked joints where brick meets render or frames and failed sealant between panels on a façade.
Outside joints can only be sealed when they’re dry, so work in Harvel is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
All of our work is guaranteed for twelve months.
- Place
- Harvel (DA13)
- Wider area
- Kent
- Guarantee
- One year on every job
- Quote
- A clear price before we start
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What happens on the day
Most of a good job is in the preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. In total, it usually takes a few hours to a few days, depending on the length of joint and the access. Somewhere as small as Harvel, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- Clear the area around the work
- Tell us about any water getting in
- On commercial sites, let us know about site rules
How to get a quote
We don’t publish a price list. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or send us an email.
Related advice
Leave it or put it right?
Mortar or ordinary filler might look like a quick way to close an open joint, but it locks the joint solid. The movement then cracks the brickwork or render nearby. A flexible sealant over backing rod is what the joint needs. Around Harvel, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
Why book with us
- More than 20 years in sealant work
- Old sealant always removed completely
- 180+ five-star Google reviews
- A sealant colour to suit the surroundings
Read what affects the cost or our reviews.
When something else is needed
Some problems need a builder, plumber or other trade rather than us:
- Cracking across the wall rather than at a joint
- Walls that need new movement joints cut into them
- Failed render or damaged cladding panels
If in doubt, phone 0345 464 0079 or drop us an email and we will say what we think.
Surfaces we seal
- Brickwork movement joints
- Copings & trims
- Render & cladding joints
- Façade panels
- Joints between brick and frames
- Concrete & block
Places near Harvel
What else we do in Harvel
Harvel: your questions answered
Do you cover smaller places like Harvel?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
I let a flat near Sole Street station. Can you help?
Yes. We work for letting agents and landlords as well as homeowners, and several properties can be quoted together. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we’ll give you a clear price.
Do you do commercial work?
Yes, regularly. Larger jobs can be planned room by room or area by area to suit the site.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
What do you need from me for a quote?
A short description and the location, with pictures by email if possible. If we need more, we will ask.
What sealant do you use?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We will tell you what we’re using and why.
Is it worth trying it myself?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Is there any odour?
Sometimes, a little. It fades as the sealant cures.
What external mastic looks like in Harvel
With historic houses such as Cobham College (about 3.4 miles north-east) nearby, there’s older building stock in the area around Harvel as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. Rainfall in the South East is lower than in much 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 Culverstone Green 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.
Harvel is about 6 miles south of Gravesend, in Kent. From the centre of Harvel to the outskirts, we cover external mastic for every kind of property, from flats and houses to offices and hotels. Our Kent coverage runs to 922 places, and Harvel is one of them. For nearby work, see our London page (23 miles or so).
Jobs for external mastic in DA13 works the same way as everywhere else we cover. You will find streets such as St Francis Road, Hart Lane and Harvel Street, and we cover them all. We also cover the places around Harvel: Priestwood Green (1 mile north), Culverstone Green (1 mile south-west), Priestwood (1 mile north), South Street (1 mile north-west) and Vigo Village (1 mile south). Larger places within reach include Maidstone (9 miles south-east), Dartford (9 miles north-west), Sevenoaks (9 miles south-west), Royal Tunbridge Wells (15 miles south), Gravesend (6 miles north) and Tonbridge (11 miles south).
Landmarks near Harvel
Typical jobs here are in homes near Meopham School and Trosley Country Park, among other places. The nearest railway station is Sole Street station, roughly 2.7 miles north of the centre. Nearby you’ll also find Leybourne Castle (3.6 miles south-east) and Coldrum Long Barrow (1.6 miles south). Open spaces near Harvel include Ranscombe Farm.
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Make sure movement joints are not pointed over
- Wash walls gently around the sealant
- Get split or bare joints resealed while the damage is small
- Check external joints each spring
Keep the joints clear of soil, plants and climbing growth. Damp material against the sealant shortens its life.
A joint that has stopped moving pushes the movement elsewhere, generally as cracking in the brickwork or render nearby. Catch it early and you reduce the risk.
What the job involves on each surface
Concrete and blockwork
Wide joints in concrete need the depth controlling carefully. Backing rod sized to the joint sets it and keep the sealant to the right depth.
Brickwork movement joints
People sometimes point up a brick movement joint by mistake. If that is happened, we rake it out and reseal it properly.
Quotes for external mastic in Harvel
We quote each job individually. These are the things that affect it:
- Whether old sealant or filler has to be cut out
- The product the joint needs
- Access and height
- The size of the job
Combining jobs into one visit generally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. You’ll get one clear quote for the whole job.
Helping us quote
You do not need to know the technical terms. Just tell us:
- What the problem is, such as mould, gaps, leaks or cracking
- Any access issues, like height or stairs
- If it’s domestic, commercial or a hotel
- Any previous sealing or DIY work
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. Whenever you’re ready, phone 0345 464 0079 or drop us an email.
Signs you need external mastic in Harvel
The wrong product in a moving joint is a classic cause. A high-modulus or general-purpose sealant can be too rigid for a busy joint, so it pulls away from the edges.
Look out for these signs:
- Cracked joints where brick meets render or frames
- Damp patches traced to an open external joint
- Joints where the bead has come unstuck
- Hard, crazed mastic that has stopped moving
Homes close to Church of Our Lady of the Meadow include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
What to look for in a quote
- Whether you can choose the colour
- How long to leave it before use
- Whether the sealant suits the joint
- What happens if they find a problem under the old sealant