Kent · England
Pembury External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for householders, landlords and businesses in Pembury. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Plants rooting in failed movement joints
- Joints pointed up with cement by mistake
- Joints where the bead has come unstuck
How to look after the new joints
No joint lasts for ever, but care makes a real difference. A few tips:
- Fix overflowing gutters above sealed joints
- Walk round the building once a year and look at the joints
- Wash walls gently around the sealant
- Get split or bare joints resealed while the damage is small
Only paint over the joint if we have confirmed the sealant can take paint. Paint can crack on a flexible joint.
Once a joint cannot move, the wall finds another way, usually as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
About our external mastic in Pembury
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. We pick a colour that sits well with the wall so the joint doesn’t stand out. We are often asked to deal with old sealant gone brittle and cracked and rigid filler in a joint that should flex, across façade panels, render & cladding joints and concrete & block.
Outbuildings, garages and conservatories around homes in places like Pembury add more joints to look after. Leaks normally start at a gutter end, a garage door frame or where an extension meets the house.
Each job carries a 12-month guarantee.
- Where
- Pembury (TN2)
- Region
- Kent
- Guarantee
- A year, on every job
- Quotes
- A clear price before work begins
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
How it works
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The job generally takes a few hours for a handful of joints, longer for a whole elevation. Parking around Pembury is normally easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- 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.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- Mention if the joints have been sealed before
- Move anything stored near the joints
- Mention any sign-in or site rules at work premises
Ask for a quote
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we’ll talk you through the work before giving you a price.
Related advice
DIY versus a professional finish
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly.
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
Nearby places to Pembury
Other services in Pembury
Your questions about external mastic in Pembury
Do you work for landlords with property near High Brooms station?
Yes. We work for landlords and letting agents as well as homeowners. 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.
Is Pembury within the area you cover?
Yes. Pembury is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
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 from the range available.
Can you seal joints between render and window frames?
Yes. Different materials move at different rates, so the joint between them must be flexible. We choose one that suits both surfaces.
What information do you need?
The location, the problem and the rough size of the job. Photos by email help too.
Do you remove the old sealant?
Yes, every time. New silicone does not stick to old silicone, so the joint is cleaned back first.
Where is Mr Mastic based?
Our base is Crawley, with over 20 years’ experience. We work across South East England, London and Scotland.
Do you have insurance?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
Landlord and commercial work in Pembury
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we will give you a quote.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
How the job changes by surface
Concrete and blockwork
Blockwork and concrete shrink over time and move with the seasons. We reseal their joints with backing rod and a flexible product.
Render joints
Water behind render can lead to blown patches. A sound joint keeps the render dry behind and protects the render itself.
Outside joints around Pembury
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you let a flat or house near High Brooms station, 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 Upper Church of St Peter, older walls, gutters and the joints where extensions meet them need a flexible sealant. Managing a site like Pembury School? Then its movement joints, gutters and trims need looking after like any other building’s.
Pembury is about 3 miles east of Royal Tunbridge Wells, in Kent. Anywhere in TN2, we cover external mastic for homes and businesses. We cover 922 towns and villages across Kent. There’s also a page for Crawley, roughly 23 miles from Pembury.
Work in TN2 works the same way as everywhere else we cover. External mastic is available to properties on High Street, Church Road and Henwood Green Road and the roads around them. Nearby, we also carry out external mastic in Key's Green (2 miles south-east), Matfield (2 miles east), Lamberhurst Quarter (2 miles south-east), Capel (2 miles north) and Petteridge (2 miles east). Further out, we also cover Maidstone (12 miles north-east), Sevenoaks (11 miles north-west), Royal Tunbridge Wells (3 miles west), Tonbridge (4 miles north-west), Kings Hill (9 miles north) and Foley Park (13 miles north-east).
Local landmarks in Pembury
Locally, jobs take us to homes and businesses close to Skinners' Kent Academy, King William IV pub and Brenchley Wood, among other places. The nearest railway station is High Brooms station, about 2.2 miles west. Other landmarks nearby include Tunbridge Wells Museum and Art Gallery (2.9 miles west) and Tunbridge Wells Hospital (0.9 miles west). Green spaces nearby include Barden Lake and Tudeley Woods RSPB reserve.
What affects the cost of external mastic
Every job gets its own quote. This is what makes a difference:
- The type of sealant required
- How many areas need sealing
- Whether the work is at height
- The amount of work
Doing several joints on one visit is usually more efficient than separate visits, so it’s worth mentioning everything you’d like done. We will give you a clear quote for the lot.
Helping us quote
Photos by email are helpful but not essential. Please mention:
- The address or postcode of the job
- The problem you’ve noticed
- Any access issues, like height or stairs
- Roughly how big the job is
To get a quote, phone 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. We will give you a clear quote before any work starts.
What we cannot put right
We will always be straight with you, so here’s what sealant can’t fix:
- Loose or hollow render, which needs re-rendering
- Subsidence or other structural problems
- Cracks in the bricks or render themselves, away from the joints
If you are not sure, just ring 0345 464 0079 or send us an email and we’ll give you a straight answer.
What we seal
- Render & cladding joints
- Joints between brick and frames
- Concrete & block
- Brickwork movement joints
- Façade panels
- Copings & trims