Kent · England
Swift's Green External Mastic
External mastic for Swift's Green, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Brick movement joints where the sealant has split
- Sealant pulling away from one side of the joint
- Joints pointed up with cement by mistake
How we handle external mastic in Swift's Green
A movement joint is only as good as its depth. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, so it bonds to the two sides only and can stretch. Common call-outs are for plants rooting in failed movement joints and brick movement joints where the sealant has split, across joints between brick and frames, façade panels and render & cladding joints.
Older homes in small places like Swift's Green may be stone, brick or timber-framed, often with later extensions. The joints where those materials meet are the weak points.
The work is covered for a year after we finish. If there’s a problem with it, please call 0345 464 0079 or drop us an email.
- Place
- Swift's Green (TN27)
- Wider area
- Kent
- Cover
- 12 months on all our work
- Quote
- A clear price before we start
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What external mastic looks like in Swift's Green
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.
For landlords with property near Headcorn station, outside joints that have cracked can let damp into a rental, so check them between lets.
Swift's Green is about 9 miles west of Ashford, in Kent. From the centre of Swift's Green 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 Swift's Green is one of them. There’s also a page for Crawley, roughly 38 miles from Swift's Green.
Postcode districts we cover here for external mastic: TN27. Other places close to Swift's Green include Smarden Bell (1 mile south), Southernden (1 mile north), Smarden (1 mile south-east), Biddenden Green (1 mile south-east) and Monk's Hill (2 miles south). Within a short drive, we also cover Maidstone (9 miles north-west), Ashford (9 miles east), Sittingbourne (12 miles north), Faversham (14 miles north-east), Kings Hill (14 miles north-west) and Davington (14 miles north-east).
Local landmarks in Swift's Green
Typical jobs here are in homes near The Bell Inn and the streets around them. Swift's Green’s nearest station is Headcorn station, about 2.1 miles west of the centre. Well-known places in the area include Kent Firefighting Museum (3.3 miles south-west) and Romden Castle (2.1 miles south-east).
What we are called out for in Swift's Green
The wrong product in a moving joint is a classic cause. A stiff, general-purpose sealant can’t cope with a joint that moves a lot, and it tears off the sides.
The problems people usually mention when they call are:
- Gaps where render, brick and frames meet
- Water getting into walls through failed joints
- Brick movement joints where the sealant has split
- Movement joints filled with mortar instead of sealant
Around Swift's Green, as everywhere, external mastic is only as good as the preparation behind it.
What your quote should include
- How hidden problems are handled
- Who does the work, and how experienced they are
- How long to leave it before use
- Are they insured?
How it works
The work is kept neat and contained to the area we are working on, so you can carry on as normal. Expect the work to take anything from a few hours to several days, depending on the building, and we tell you how long to leave it before we go. In a small place like Swift's Green, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
- Clear items away from the joints we are working on
- Tell us about any previous sealing or DIY attempts
Ask for a quote
For a quote, phone 0345 464 0079 or email us with the location and a short description of the problem. You will have a clear quote before any work starts.
Advice
How we quote for external mastic
Jobs vary more than people expect. The main factors:
- Access and height
- When we can work, for business premises
- The amount of work
- The product the joint needs
We don’t show prices on the website, because each job is priced on what it involves. For a quick quote, please ring 0345 464 0079 or send us an email.
What we need to know
Photos help, but a description is a good start. Please mention:
- The address or postcode of the job
- The problem you’ve noticed
- A few pictures by email, if you can
- How many joints, rooms or windows are involved
Want a quote for external mastic? Please ring 0345 464 0079 or email us and tell us about the job. We’ll explain what we’d do and send you a clear quote before any work starts.
When something else is needed
We will always be straight with you, so here’s what sealant can’t fix:
- Adding movement joints to masonry that has none
- Render that’s blown, hollow or coming away
- Cracked brickwork or render that needs a builder or plasterer
If you’re not sure, just call 0345 464 0079 or send us an email and we’ll give you a straight answer.
What we seal
- Brickwork movement joints
- Joints between brick and frames
- Copings & trims
- Façade panels
- Concrete & block
- Render & cladding joints
Can I do it myself?
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so just mention it when you contact us.
A careful DIYer can reseal a simple joint, 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.
Surface by surface
Copings and trims
Copings expand and contract through the day, so a flexible sealant suits them best.
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. The old joint is removed and a sealant that bonds to both sides goes in.
Why act early in Swift's Green
Sealing over the top of old mastic does not hold for long. New sealant does not bond well to old, weathered sealant, so the old joint is cut out fully first. Around Swift's Green, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
The cost depends on how much there is to do, how hard the old material is to remove and how easy the joints are to reach. You’ll have a clear quote before any work starts.
Why book with us
- Sanitary silicone with an anti-fungal additive in wet areas
- An ARBOMaster approved applicator
- More than 20 years in sealant work
- Homes, businesses and hotels
Also near Swift's Green
Also in Swift's Green
Swift's Green: your questions answered
Do you cover Swift's Green for external mastic?
Yes, Swift's Green is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or email us and let us know what needs doing, and we will give you a clear quote.
Do you work for landlords with property near Headcorn station?
Yes, we work for landlords and letting agents. You can ring 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before we start.
Is there any odour?
Some sealants have a smell while they cure, which fades as it sets. Ventilation helps.
Will it make a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
When is the sealant fully cured?
Many sealants skin over quickly but take longer to cure fully. We’ll tell you how long to leave the joint.
Are you ARBOMaster approved?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Can you work on commercial sites?
Yes. Commercial and hotel work is a large part of what we do. We can talk about working times when we quote.
What does external mastic cost?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. You will get a clear quote before any work starts.