Kent · England
External Mastic in Derringstone
We cover Derringstone for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and a one-year guarantee.
- Weathered mastic that no longer stretches
- Joints where the bead has come unstuck
- Cracked joints where brick meets render or frames
External mastic in Derringstone, done properly
We are ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Porous or awkward surfaces are primed where the sealant needs it, and we do not skip that step. If you’re dealing with joints pointed up with cement by mistake and sealant pulling away from one side of the joint, we can put it right, whatever the surface.
Older homes in small places like Derringstone may be stone, brick or timber-framed, often with later extensions. The joints where those materials meet are the weak points.
Whatever the size of the job, you get the same 12-month guarantee in Derringstone and across Kent.
- Where
- Derringstone (CT4)
- Region
- Kent
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Landlord and commercial work in Derringstone
For anyone letting property in or around Derringstone, several properties can be quoted together. Send us the addresses and the work at each.
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together.
Walls and rooflines in Derringstone
With historic houses such as Goodnestone Park (about 4.2 miles north-east) nearby, there’s older building stock in the area around Derringstone as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For site and facilities teams at buildings such as Barham Church of England Primary School, its movement joints, gutters and trims need looking after like any other building’s. For landlords with property near Snowdown station, split movement joints are easy to miss on a rental until damp shows inside.
Derringstone is about 6 miles south-east of Canterbury, in Kent. Jobs in Derringstone get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Derringstone is one of 922 places in Kent where we work for external mastic. You can also see our page for Chelmsford, about 47 miles away.
All of CT4 is covered for external mastic, from the main roads to the quietest streets. If you need external mastic at a property on Derringstone Street, The Causeway and Railway Hill or anywhere close by, we can help. We also cover Heart's Delight (1 mile south-west), Barham (1 mile north), Gravel Castle (1 mile east), Out Elmstead (1 mile north) and Marley (1 mile north-west). Within a short drive, we also cover Ashford (13 miles west), Canterbury (6 miles north-west), Dover (8 miles south-east), Folkestone (8 miles south), Ramsgate (15 miles north-east) and Whitstable (12 miles north-west).
Local landmarks in Derringstone
Typical jobs here are in homes near Jumping Downs. The closest station to Derringstone is Snowdown station, about 2.6 miles east. Nearby you’ll also find Kent and Canterbury Hospital (5.3 miles north-west).
Nearby places to Derringstone
Other services in Derringstone
When to call us in Derringstone
Poor preparation causes many early failures: dusty or wet faces, no primer where one was needed, or old sealant left in. The sealant never bonds properly.
People usually contact us after spotting one of these:
- Weeds or debris growing in open joints
- Movement joints filled with mortar instead of sealant
- Panel joints letting water in
- Joints with sealant missing in places
Homes close to Church of St John the Baptist include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain.
What your quote should include
- Who turns up on the day
- How the surfaces are prepared before sealing
- What happens if they find a problem under the old sealant
- Are they insured?
The process
Every visit runs the same way: we look at the joints together, protect the area around them, do the work and tidy away. Most jobs take a few hours for a handful of joints, longer for a whole elevation. In a small place like Derringstone, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- We cut out the failed sealant and rake out any dirt or growth.
- We clean both faces of the joint and prime them where the product calls for it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Before we arrive
- Mention any parking rules near the property
- Let us know if you’ve seen damp or leaks
- Mention any tricky access
Ask for a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.
Read more
Why deal with it now?
Resealing a run of joints in one go is normally better than patching one at a time. They’ve weathered the same way. In a small place like Derringstone, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you’re not sure whether it needs doing, phone 0345 464 0079 or send us an email and we will give you an honest view and a quote.
Why Derringstone customers choose us
- Anti-fungal sanitary silicone in wet areas
- More than 20 years in sealant work
- A choice of colours where the product allows
- Colour agreed with you before work begins
Read our cost guide or what customers say.
How to look after the new joints
To keep the joints looking good and working properly:
- Avoid pressure-washing directly into sealant joints
- Show decorators and builders where the movement joints are
- Keep soil, plants and ivy away from the joints
- Keep water from gutters off the wall
Keep the joints clear of soil, plants and climbing growth. Anything that holds water against the joint wears it out sooner.
Leaks behind façade panels and render often go unseen. By the time there’s a damp patch, the damage can be well established.
Quotes for external mastic in Derringstone
You’ll get a clear quote before any work starts. It takes into account:
- Which sealant suits the joint
- Working hours on commercial sites
- Whether there’s mould to deal with
- How easy the joints are to reach
The cost reflects the work involved, not a rough estimate. That’s why we ask a few questions first.
Helping us quote
To help us quote quickly, please include:
- The rough size of the job
- Photos by email, if that’s easy
- The address or postcode of the job
- If it’s domestic, commercial or a hotel
For a quote, call 0345 464 0079 or drop us an email with the location and a short description of the problem. You will have a clear quote before we start.
DIY sealant or a professional job?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Derringstone: your questions answered
I let a flat near Snowdown station. Can you help?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before any work starts.
Will you come out to Derringstone?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
How long does external mastic last?
There’s no fixed answer: joints on exposed walls or with a lot of movement age sooner. Check them each year and reseal when they split or harden. Our work comes with a one-year guarantee.
Are you fully insured?
Yes, we are fully insured for every job we do.
What’s an expansion joint in brickwork?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It’s sealed with a flexible sealant, not mortar.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
How much does external mastic cost in Derringstone?
We do not publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. You’ll get a clear quote before any work starts.
Is the work guaranteed?
Yes: twelve months. If there’s a problem with our work in that time, tell us and we’ll put it right.