Kent · England
External & façade joints in Barham, Kent
External mastic for Barham, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Rigid filler in a joint that should flex
- Plants rooting in failed movement joints
- Brick movement joints where the sealant has split
What happens if it’s left?
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That matters on brick, render and concrete, which can be weaker at the face. A stiffer product can damage the joint edge as it fails. Where a wall is exposed, as many are in small places like Barham, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
There are no prices on our website, because each job is priced on what it involves. Call for a quick quote.
Why choose Mr Mastic in Barham
- Quality sealants from Arbo and Everbuild
- Anti-fungal sanitary silicone in wet areas
- An ARBOMaster approved applicator
- We agree the colour with you first
See what affects the cost and what customers say.
External mastic for homes and businesses in Barham
For buildings in Barham, we reseal external joints of all kinds, from brick movement joints to cladding panels. Every joint gets the same careful preparation: clean joint faces and the right depth. If you have cracked joints where brick meets render or frames and sealant pulling away from one side of the joint, we can help.
Older homes in small places like Barham may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water usually gets in, and they need the right sealant at the right depth.
All our work is covered by our 12-month guarantee, wherever you are in Kent.
- Place
- Barham (CT4)
- Region
- Kent
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
When it isn’t the sealant
Before you book, it’s worth knowing the limits:
- Render that’s blown, hollow or coming away
- Damp that is not coming from the joint
- Movement that’s more than a sealant joint can take
Not sure which it is? You can call 0345 464 0079 or send us an email and we’ll tell you honestly before booking.
Joints and surfaces we work on
- Render & cladding joints
- Façade panels
- Brickwork movement joints
- Joints between brick and frames
- Concrete & block
- Copings & trims
Other services in Barham
How we quote for external mastic
There’s no set price list, because no two jobs are the same. The quote depends on:
- How many rooms, windows or areas are involved
- The number and length of the joints
- How easy the joints are to reach
- Whether old sealant or filler has to be cut out
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
What to tell us for a quote
Before you ask for a quote, have a think about:
- Pictures of the joints, sent by email
- Any previous sealing or DIY work
- Whether it’s a home or a business
- Roughly how big the job is
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and add pictures by email if you can.
Keeping the joints in good condition
After the cure time, these simple habits help:
- Deal with leaking gutters that soak the joints below
- Act on the first splits you see
- Walk round the building once a year and look at the joints
- Check the sealant is paintable before painting near it
Look over the joints once a year, ideally after winter. 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.
Barham questions
Is Barham within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you cover Barham for external mastic?
Yes, Barham is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job.
Which products do you use?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We explain the product when we quote.
How often do external joints need resealing?
It varies with how exposed the wall is and how much the joint moves. Signs to watch for are cracking, hardening and gaps at the edges, and reseal at that point.
Does someone need to be in?
We need access to the joints, so we will agree that with you when we book. Indoors, that usually means someone at home.
Will there be a smell?
Some sealants have a smell while they cure. Ventilation helps.
Are you an approved applicator?
Yes. We are approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
How long will you be here?
A typical job takes a few hours to a few days, depending on the length of joint and the access. We’ll confirm how long when we quote.
Surface by surface
Render joints
Water behind render can lead to blown patches. A sound joint keeps the render dry behind and helps it last.
Joints between dissimilar materials
Brick against render, concrete against metal, stone against timber: every change of material is a joint. A flexible sealant bridges the two.
The process
The work is kept neat and contained to the joints we’re treating, so you can carry on as normal. Expect the work to take a few hours for a handful of joints, longer for a whole elevation. Somewhere as small as Barham, access is often the only tricky part. 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.
- The old mastic and anything lodged in the joint is removed.
- 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.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Before we arrive
- Clear the area around the work
- Mention any parking rules near the property
- Let us know if you’ve seen damp or leaks
How to get a quote
Getting a quote is simple: tell us what needs doing and where. A few pictures by email make the job easier to understand.
Advice
Walls and rooflines in Barham
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Goodnestone Park (about 3.9 miles north-east) nearby, there’s older building stock in the area around Barham as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
If you let a flat or house near Snowdown station, split movement joints are easy to miss on a rental until damp shows inside. For an older house near a landmark such as Church of St John the Baptist, an extension built onto an older house moves differently, and the joint between them takes the strain.
Barham is about 6 miles south-east of Canterbury, in Kent. Anywhere in CT4, we can carry out external mastic at your property. Our area takes in 922 places across Kent, large and small. We also work in Chelmsford, around 47 miles away.
Jobs for external mastic in CT4 works the same way as everywhere else we cover. That includes homes and businesses on The Street, Valley Road and Church Lane and the roads around them. We also cover Derringstone (1 mile south), Gravel Castle (1 mile south-east), Heart's Delight (1 mile south-west), Out Elmstead (1 mile north) and Kingston (1 mile north-west). Further out, we also cover Ashford (13 miles west), Canterbury (6 miles north-west), Margate (15 miles north-east), Dover (8 miles south-east), Folkestone (8 miles south) and Ramsgate (14 miles north-east).
Near you in Barham
Typical jobs here are in homes near Jumping Downs and Black Robin Public House. The closest station to Barham is Snowdown station, about 2.4 miles east of the centre. Other landmarks nearby include Kent and Canterbury Hospital (5.1 miles north-west).
What we’re called out for in Barham
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, so it pulls away from the edges.
Signs it’s time to call us include:
- Leaking joints around cladding and façade panels
- Plants rooting in failed movement joints
- Cracked joints where brick meets render or frames
- Hard, crazed mastic that has stopped moving
For site and facilities teams at buildings such as Barham Church of England Primary School, larger buildings have long runs of movement joint that eventually need resealing.
Before booking anyone
- Who does the work, and how experienced they are
- Whether you can choose the colour
- How long to leave it before use
- How long the guarantee is