Medway · England
External & façade joints in Dunn Street, Medway
Sealing brickwork movement joints, render, cladding and façade joints for Dunn Street, backed by a one-year guarantee. Call for a quick quote.
- Sealant that has lost its bond to the brick or render
- Rigid filler in a joint that should flex
- Rain getting behind render or cladding at a joint
About our external mastic in Dunn Street
Movement joints let brickwork, render and cladding expand and shrink without cracking. Its sealant has to flex with the building, season after season, and when it fails, the wall takes the strain and water finds a way in. If you are dealing with rain getting behind render or cladding at a joint and joints pointed up with cement by mistake, we can put it right, whatever the surface.
Older homes in small places like Dunn Street 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.
Whatever the size of the job, you get the same one-year guarantee.
- Location
- Dunn Street (ME7)
- Wider area
- Medway
- Cover
- One year on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Leave it or put it right?
Mortar or ordinary filler might look like a quick way to close an open joint, but it locks the joint solid. The wall then cracks somewhere else. A flexible sealant over backing rod is what the joint needs. Older cottages and farmhouses around Dunn Street can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part, and we’ll explain the quote if you ask.
Why book with us
- Sanitary silicone with an anti-fungal additive in wet areas
- Any old sealant cut out fully, not covered over
- Rated 4.9 stars on Google
- Over 20 years’ experience
Take a look at what affects the cost or what customers say.
Also near Dunn Street
More services for Dunn Street
What we do, step by step
Most of a good job is in the preparation, so that is where we spend the time. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours for a handful of joints, longer for a whole elevation. Somewhere as small as Dunn Street, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- Tell us if parking is tricky
- For indoor joints, keep the area dry beforehand if you can
- Move anything stored near the joints
Get a quote
To get a quote, phone 0345 464 0079 or drop us an email with the location and a short description of the problem. We’ll give you a clear price before any work starts.
Related advice
How we quote for external mastic
We quote each job individually. This is what makes a difference:
- Whether old sealant or filler has to be cut out
- How much there is to do
- How many rooms, windows or areas are involved
- Working hours on commercial sites
Combining jobs into one visit is generally more efficient than separate visits. We will give you a clear quote for the lot.
Asking for a quote
To make quoting easier, let us know:
- Roughly how big the job is
- Any previous sealing or DIY work
- Where the property is
- Access, such as stairs, a lift or height
Every job is quoted individually, so start by telling us what you need. Just ring 0345 464 0079 or send us an email with the details, and photos are welcome.
When something else is needed
It helps to know what we cannot do:
- Damp that is not coming from the joint
- Failed render or damaged cladding panels
- Structural movement, which needs a surveyor or engineer
Not sure which it is? You can phone 0345 464 0079 or send us an email and we’ll tell you honestly.
What we seal
- Concrete & block
- Façade panels
- Brickwork movement joints
- Render & cladding joints
- Copings & trims
- Joints between brick and frames
Do you need external mastic in Dunn Street?
Sunlight, wet weather and frost wear exterior sealant down. Over the years it hardens, cracks on the surface and loses its give, so the next time the wall moves, it splits or pulls away.
People generally contact us after spotting one of these:
- Movement joints filled with mortar instead of sealant
- Old sealant gone brittle and cracked
- Cracked joints where brick meets render or frames
- Plants rooting in failed movement joints
Managing a site like Swingate Primary School? Then its movement joints, gutters and trims need looking after like any other building’s.
What your quote should include
- Whether they’re fully insured
- Who does the work, and how experienced they are
- The length of the guarantee
- How the surfaces are prepared before sealing
Can I do it myself?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
The biggest DIY mistake is sealing over old sealant. 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.
FAQs for Dunn Street
Will you come out to Dunn Street?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Can you help a landlord with a rental near Rainham (Kent) station?
Yes, we work for letting agents and landlords. Just phone 0345 464 0079 or email us and tell us about the property, and we will give you a clear quote.
What do you need from me for a quote?
Just the basics: the address or postcode, what’s wrong and any access issues. Then ring 0345 464 0079 or email us.
Do you take out the old sealant first?
Yes, always, and completely. New sealant won’t bond properly to old, so the joint is cleaned back first.
Can you do several jobs on one visit?
Yes. Tell us about everything you’d like done and we’ll quote it together.
How long does external mastic take?
Most jobs take anything from a few hours to several days, depending on the building. Your quote will say how long we expect yours to take.
Is there any odour?
There can be a smell while the sealant cures, which fades as it sets. Ventilation helps.
Should I point up the gap in my brickwork?
No. Cement or mortar cannot stretch, so the joint stops doing its job. Where a joint has been mortared, it can often be raked out and sealed properly.
For landlords and businesses
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.
Landlords and agents in Dunn Street can book us as well as homeowners. Resealing between tenancies keeps a property looking cared for before the next move-in.
What external mastic looks like in Dunn Street
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you live in an older home near Church of St Peter, older walls, gutters and the joints where extensions meet them need a flexible sealant. Letting a property close to Rainham (Kent) station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
Dunn Street is about 3 miles south-east of Chatham, in Medway. Every kind of property in Dunn Street can book us for external mastic, old or new, large or small. The work is guaranteed for a year. We cover 68 towns and villages across Medway. There’s also a page for Chelmsford, roughly 29 miles from Dunn Street.
Jobs for external mastic in ME7 works the same way as everywhere else we cover. Close by, we work in Lidsing (1 mile north-west), Bredhurst (1 mile north-east), Scragged Oak (1 mile south-east), Kemsley Street (1 mile north-east) and Lower Cox Street (1 mile south-east). Further out, we also cover Gillingham (3 miles north), Chatham (3 miles north-west), Rochester (5 miles north-west), Rainham (3 miles north-east), Strood (6 miles north-west) and Luton (3 miles north-west).
Landmarks near Dunn Street
Around Dunn Street, our work takes us to homes and buildings near South Wood and The Harrow pub, among other places. For rail, the closest station is Rainham (Kent) station, about 3.3 miles north-east of the centre. A little further out are KIMS hospital (2.8 miles south) and Allington Castle (3.4 miles south-west). For a walk, there’s Boxley Hills and Burham Down.