Kent · England
Heaverham External Mastic
Specialist external mastic for Heaverham: careful preparation, the right product and tidy work. Call for a quick quote.
- Brick movement joints where the sealant has split
- Weathered mastic that no longer stretches
- Rigid filler in a joint that should flex
External mastic in Heaverham: local notes
With historic houses such as Ightham Mote (about 3.3 miles south) nearby, there’s older building stock in the area around Heaverham as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Managing a site like Kemsing Primary School? Then larger buildings have long runs of movement joint that eventually need resealing. For an older house near a landmark such as Church of St Mary, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Heaverham is about 3 miles north-east of Sevenoaks, in Kent. Every kind of property in Heaverham can book us for external mastic, old or new, large or small. The work is guaranteed for a year. We cover 922 towns and villages across Kent. Our London page covers work nearby, about 20 miles away.
Every address in TN15 is covered for external mastic. We also cover Cotman's Ash (1 mile north-west), Woodlands (1 mile north), Kemsing (2 miles west), Knatts Valley (2 miles north) and Romney Street (2 miles north-west). Further out, we also cover Maidstone (12 miles east), Dartford (10 miles north), Sevenoaks (3 miles south-west), Royal Tunbridge Wells (12 miles south), Gravesend (10 miles north-east) and Tonbridge (7 miles south).
Local landmarks in Heaverham
We work in homes and buildings around Wrotham School, The Chequers Public House and Kemsing Down and the streets around them. For rail, the closest station is Kemsing station, roughly 0.6 miles south-west. A little further out are Otford Heritage Centre (2.5 miles west) and Kemsing Castle Bank (1 mile west). For a walk, there’s Dryhill Nature Reserve.
How we handle external mastic in Heaverham
We are ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Some surfaces need a primer before sealing. We work on render & cladding joints, copings & trims and façade panels, and common reasons people get in touch are panel joints letting water in and sealant pulling away from one side of the joint.
In a village or hamlet like Heaverham, older cottages and farm buildings often stand in the open, so walls and rooflines take the full force of wind and rain. Joints on those walls need a sealant that moves with the building and stays in place.
Big or small, it’s backed by our 12-month guarantee in Heaverham and across Kent.
- Place
- Heaverham (TN15)
- Wider area
- Kent
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Places near Heaverham
Also in Heaverham
Keeping the joints in good condition
Simple care keeps the joints in good condition. Our advice:
- Avoid pressure-washing directly into sealant joints
- Ask before painting over external sealant
- Walk round the building once a year and look at the joints
- Fix overflowing gutters above sealed joints
Have a quick look at the joints each spring. Watch for splits, edges coming away or growth in the joint.
A joint that has stopped moving pushes the movement elsewhere, often as cracks near the joint. Resealing it early helps prevent that.
Signs you need external mastic in Heaverham
Weeds, moss and debris in a joint are a sign the sealant has gone. Dirt and roots then trap moisture in the joint and speed up the damage.
Signs it’s time to call us include:
- Moss and dirt in joints with no sealant left
- Rigid filler in a joint that should flex
- Joints where the bead has come unstuck
- Old sealant gone brittle and cracked
For landlords with property near Kemsing station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
What your quote should include
- How long to leave it before use
- Whether they seal over old material or remove it
- What preparation is included
- What insurance they hold
How the visit works
You don’t need to clear the whole room or building, only the area right around the joints. We protect the rest, and the work takes anything from a few hours to several days, depending on the building for a typical job. In a small place like Heaverham, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- First we look over the joints with you, agree which to renew and talk through access.
- Old sealant and any debris are cut and raked out.
- We clean both faces of the joint and prime them where the product calls for it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Preparing for the visit
- Mention any tricky access
- Tell us if parking is tricky
- For indoor joints, keep the area dry beforehand if you can
Ask for a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. When it suits you, phone 0345 464 0079 or send us an email.
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How we quote for external mastic
Every job gets its own quote. These are the things that affect it:
- The type of sealant required
- How many rooms, windows or areas are involved
- Any mould that needs treating
- The old material and how stubborn it is
Doing several joints on one visit normally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. We will give you a clear price for the lot.
Helping us quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- If it’s domestic, commercial or a hotel
- Pictures of the joints, sent by email
- Roughly how big the job is
- Any previous sealing or DIY work
Asking for a quote is easy: let us know the job and the location and its rough size. A few photos by email make the job easier to understand, and we’ll come back to you with a quote.
When something else is needed
We won’t take on work that will not last, so here’s what sealant can’t put right:
- Cracked brickwork or render that needs a builder or plasterer
- Render that is blown, hollow or coming away
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
If in doubt, call 0345 464 0079 or send us an email and we’ll say what we think before you book.
What we seal
- Brickwork movement joints
- Façade panels
- Render & cladding joints
- Joints between brick and frames
- Concrete & block
- Copings & trims
How the job changes by surface
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. We cut out the old sealant and reseal with a product suited to both surfaces.
Render joints
Rendered walls have joints at beads, openings and changes of material. We reseal them with a flexible exterior sealant that suits the render colour.
Work for landlords, hotels and businesses
Landlords and letting agents in Heaverham can book us as well as homeowners. Resealing between tenancies keeps a property looking cared for before the next move-in.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Questions from Heaverham
Do you cover Heaverham for external mastic?
Yes, Heaverham is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or drop us an email with a few details of the job.
I let a flat near Kemsing station. Can you help?
Yes, we work for landlords and agents. You can phone 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before work begins.
Which products do you use?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
When will the joints need doing again?
That varies with the weather the wall faces, how much it moves and the sealant used. Treat it as a maintenance item and look at it yearly.
Do you guarantee your work?
Yes. All our work carries our one-year guarantee.
How do you reach high-level joints?
It depends on the building. We work on joints that can be reached safely. Tell us about the building and we’ll confirm what access is needed.
Should I try DIY first?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Can you match the colour of my brickwork?
The aim is a neat, even joint in a colour that suits the wall. Colour is agreed with you before we begin.