Kent · England
External Mastic in Plaxtol
Sealing brickwork movement joints, render, cladding and façade joints in Plaxtol, with a 12-month guarantee on every job. Call for a quick quote.
- Moss and dirt in joints with no sealant left
- Old sealant gone brittle and cracked
- Leaking joints around cladding and façade panels
What we do, step by step
When we arrive, we start by going over the job with you, so there are no surprises. We protect the surfaces around the joints before any work starts. Most jobs take a few hours for a handful of joints, longer for a whole elevation. Somewhere like Plaxtol needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- First we look over the joints with you, agree which to renew and talk through access.
- The old mastic and anything lodged in the joint is removed.
- Both sides are cleaned back to sound material and primed if needed.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Getting ready for the visit
- Mention if the joints have been sealed before
- Plan for the work area to be out of bounds to pets and children
- Mention any sign-in or site rules at work premises
How to get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. When it suits you, call 0345 464 0079 or email us.
Advice
How we handle external mastic in Plaxtol
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Porous or awkward surfaces are primed where the sealant needs it and we use one wherever it does. We work on copings & trims, brickwork movement joints and joints between brick and frames, and people most often call us about hard, crazed mastic that has stopped moving and failed sealant between panels on a façade.
Outside joints can only be sealed when they’re dry, so work in Plaxtol is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
You’re covered for a year from the day we finish. If there’s a problem with it, please ring 0345 464 0079 or email us.
- Location
- Plaxtol (TN15)
- Region
- Kent
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
External mastic in Plaxtol: local notes
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. Historic houses like Old Soar Manor (about 0.7 miles north-east) are a reminder that the area around Plaxtol 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.
For landlords with property near Borough Green & Wrotham station, split movement joints are easy to miss on a rental until damp shows inside. For site and facilities teams at buildings such as Plaxtol Primary School, larger buildings have long runs of movement joint that eventually need resealing.
Plaxtol is about 4 miles north of Tonbridge, in Kent. We provide external mastic to homes and businesses in Plaxtol and the surrounding area, as part of our work across Kent. Plaxtol is one of 922 places in Kent we cover for external mastic. For nearby work, see our London page.
Our applicators cover all of the TN15 postcode area for external mastic. You’ll find streets such as The Street, St Hildas and Long Mill Lane. Neighbouring places we cover for external mastic include Dunk's Green (1 mile south), Roughway (1 mile south-east), Claygate Cross (1 mile north), Crouch (1 mile north) and Basted (1 mile north). Within a short drive, we also cover Maidstone (10 miles east), Dartford (13 miles north), Sevenoaks (5 miles west), Royal Tunbridge Wells (9 miles south), Gravesend (12 miles north) and Tonbridge (4 miles south).
Local landmarks in Plaxtol
Typical jobs here are in homes near The Kentish Rifleman Public House and Ivy Hatch Nature Reserve and the streets around them. For rail, the closest station is Borough Green & Wrotham station, about 2.4 miles north of the centre. Nearby you will also find Ightham Court (2.6 miles north) and Sevenoaks Hospital (5.2 miles north-west). Green spaces nearby include Barden Lake.
When something else is needed
We’d rather tell you now than do work that will not last, so these are the limits:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Failed render or damaged cladding panels
- Cracks in the bricks or render themselves, away from the joints
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we’ll tell you honestly before you book.
What we seal
- Concrete & block
- Façade panels
- Copings & trims
- Joints between brick and frames
- Brickwork movement joints
- Render & cladding joints
What affects the quote in Plaxtol
You’ll get a clear quote before any work starts. It’s based on:
- When we can work, for business premises
- How many areas need sealing
- Which sealant suits the joint
- Whether old sealant or filler has to be cut out
The cost reflects the work involved, not a rough estimate. That’s why we ask about the job first and send you a clear quote before we start.
What to tell us for a quote
Before you ask for a quote, have a think about:
- Pictures of the joints, sent by email
- If someone has resealed it before
- How we’d reach the joints
- What the problem is, such as mould, gaps, leaks or cracking
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we’ll explain what’s involved before giving you a price.
Common questions in Plaxtol
Is Plaxtol in your area for external mastic?
Yes. Our work covers London and the South East, and Plaxtol is part of that. You can phone 0345 464 0079 or drop us an email and tell us what needs doing, and we will give you a clear quote.
Can you help a landlord with a rental near Borough Green & Wrotham station?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or send us an email and tell us about the property, and we will send you a clear quote.
Do I need to be at home?
We need access to the joints, so we will agree that with you when we book. Indoors, that normally means someone at home.
Do you take out the old sealant first?
Yes. We cut out all the old sealant and clean the joint before applying anything new.
What do you need from me for a quote?
Only a few details: the address or postcode, what’s wrong and any access issues. After that, simply phone 0345 464 0079 or email us.
Do you seal joints where cladding meets other materials?
Yes. We cut out the old sealant, prepare both faces and reseal with a flexible exterior product. The colour is chosen to suit.
How long does the job take?
Most jobs take anything from a few hours to several days, depending on the building, including the preparation. We’ll confirm how long when we quote.
Is it OK to seal over old sealant?
No, because it fails. We remove every bit of old sealant first, so the new sealant bonds properly.
Can I do it myself?
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Looking after it afterwards
After the cure time, these simple habits help:
- Leave the joints unpainted unless we have said otherwise
- Get split or bare joints resealed while the damage is small
- Clear growth from the base of walls and joints
- Fix overflowing gutters above sealed joints
Have a quick look at the joints each spring. Splits, gaps at the edges or plants in the joint are early warning signs.
A joint that has stopped moving pushes the movement elsewhere, generally as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
How the job changes by surface
Copings and trims
Metal and stone copings both move with temperature, so a flexible sealant suits them best.
Brickwork movement joints
People sometimes point up a brick movement joint by mistake. If that’s happened, we rake it out and reseal it properly.
Signs you need external mastic in Plaxtol
Every building moves. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. The sealant in the movement joints takes that strain.
The problems people usually mention when they call are:
- Brick movement joints where the sealant has split
- Gaps where render, brick and frames meet
- Joints where the bead has come unstuck
- Rigid filler in a joint that should flex
In the older streets around Plaxtol Church, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Comparing quotes
- How the joint is cleaned and prepared
- Are they insured?
- Whether you can choose the colour
- Who does the work, and how experienced they are