Kent · England
External & façade joints in Denton, Kent
Sealing brickwork movement joints, render, cladding and façade joints for homeowners, landlords and businesses in Denton. Fully insured, ARBOMaster approved and guaranteed for a year.
- Weeds or debris growing in open joints
- Water getting into walls through failed joints
- Leaking joints around cladding and façade panels
How we quote for external mastic
Jobs vary more than people expect. The main factors:
- Whether the work is at height
- Any mould that needs treating
- Which sealant suits the joint
- The size of the job
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 we need extra access for height. Your quote takes all of that into account.
Asking for a quote
Photos by email are helpful but not essential. Try to tell us:
- Where the job is, and your postcode
- Pictures of the joints, sent by email
- Access, such as stairs, a lift or height
- Whether it has been sealed before
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we’ll explain what’s involved before giving you a price.
External mastic for homes and businesses in Denton
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible sealant bridges the two where mortar or filler would crack. We work on render & cladding joints, joints between brick and frames and concrete & block, and the jobs we see most are movement joints with cracked, split or missing sealant and old sealant gone brittle and cracked.
Homes around Denton range from older cottages to newer houses, with walls and rooflines of every type. Older gutters and trims need their joints resealed; newer brick and render need their movement joints kept sound.
There’s a 12-month guarantee on every job, whatever its size.
- Place
- Denton (DA12)
- Region
- Kent
- Cover
- 12 months on all our work
- Quote
- A clear price before work begins
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
For landlords and businesses
Letting agents and landlords in Denton can book us as well as householders. Sealant work between tenants is a simple way to keep a property in good order before the next move-in.
Hotels need rooms back in use, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
Signs you need external mastic in Denton
Sometimes a movement joint was filled with mortar or a rigid filler by mistake. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
Any of these means the joints need attention:
- Movement joints filled with mortar instead of sealant
- Movement joints with cracked, split or missing sealant
- Water getting into walls through failed joints
- Failed sealant between panels on a façade
For site and facilities teams at buildings such as St John's Catholic Primary School, its movement joints, gutters and trims need looking after like any other building’s.
Before booking anyone
- Whether you can choose the colour
- How long to leave it before use
- How the surfaces are prepared before sealing
- Whether they’re fully insured
When something else is needed
We’d rather tell you now than do work that won’t last, so here’s what sealant cannot put right:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Cracking across the wall rather than at a joint
- Failed render or damaged cladding panels
If in doubt, call 0345 464 0079 or send us an email and we’ll say what we think before you book.
What we seal
- Joints between brick and frames
- Copings & trims
- Render & cladding joints
- Brickwork movement joints
- Concrete & block
- Façade panels
Common questions in Denton
Does the coastal weather in Denton affect outside sealant?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Is Denton 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 use backing rod?
That’s backing rod, a closed-cell foam. It keeps the sealant at the right depth and bonded to the sides only, which would stop it stretching.
How long does external mastic last?
That varies with the weather the wall faces, how much it moves and the sealant used. Sealant is a maintenance item, so check the joints once a year.
How much does external mastic cost in Denton?
It depends on the job, so we quote each one individually. To get one, ring 0345 464 0079 or email us with a short description of the job.
Can you reach joints on upper floors?
That depends on the building and the joints. We work on joints that can be reached safely. Tell us about the building and we’ll confirm what access is needed.
Can you do several jobs on one visit?
Yes. Several rooms, windows or areas can go on one quote.
Will you leave a mess?
No. The area is protected while we work and cleaned up afterwards.
Can I do it myself?
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.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Outside joints around Denton
Denton is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Rented homes near Gravesend station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies. In the older streets around Church of St Peter and St Paul, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Denton is about 1 mile east of Gravesend, in Kent. Denton gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Denton is one of 922 towns and villages in Kent we cover for external mastic. You can also see our page for Chelmsford, roughly 21 miles from Denton.
Jobs for external mastic in DA12 works the same way as everywhere else we cover. That includes homes and businesses on Barr Road, Mark Lane and Forge Lane and the roads around them. Main roads around Denton include the A226. Other places close to Denton include Milton-next-Gravesend (1 mile north-west), Gravesend (1 mile west), Windmill Hill (1 mile west), Singlewell or Ifield (2 miles south-west) and Northfleet (2 miles west). Within a short drive, we also cover Maidstone (13 miles south-east), Dartford (7 miles west), Sevenoaks (14 miles south-west), Swanley (10 miles west), Kings Hill (11 miles south) and Foley Park (12 miles south-east).
Landmarks near Denton
In Denton, that means homes and buildings near The Ship & Lobster pub, St John's Catholic Comprehensive and St John's Catholic Comprehensive, among other places. For rail, the closest station is Gravesend station, about 1.2 miles north-west. Other landmarks nearby include Gravesham Museum (1.2 miles north-west) and Gravesham Community Hospital (1.4 miles north-west). Not far away are Sawyers Lake and Gad's Hill.
Surface by surface
Joints between dissimilar materials
Each side of the joint may need its own preparation. Both surfaces are cleaned and primed as the product requires.
Copings and trims
Coping and trim joints face rain and sun head on. We reseal them with an exterior sealant suited to the material.
Nearby places to Denton
What else we do in Denton
The process
We work through the job in order: protect, prepare, seal, tidy. Typically it takes a few hours to a few days, depending on the length of joint and the access and we leave things clean and tidy. In a smaller place like Denton, parking is seldom the issue; lanes, gates and long drives are worth mentioning. For outside work, side access and the height of the joints help us plan.
- 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.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
How to prepare
- Let us know if you’ve seen damp or leaks
- Let us know about stairs, lifts or work at height
- Tell us about any previous sealing or DIY attempts
Get a quote
Asking for a quote is easy: let us know what needs doing and where. Photos by email help us understand the job.