Medway · England
Tunbridge Hill External Mastic
External mastic for Tunbridge Hill, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Cracked joints where brick meets render or frames
- Joints with sealant missing in places
- Plants rooting in failed movement joints
How we handle external mastic in Tunbridge Hill
A movement joint is only as good as its depth. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, leaving it bonded to two faces so it can move with the wall. If you are dealing with plants rooting in failed movement joints and sealant pulling away from one side of the joint, we can help, on copings & trims, concrete & block and façade panels alike.
Somewhere as small as Tunbridge Hill, homes and farm buildings often face open ground, so walls and rooflines take the full force of wind and rain. Gutter joints and wall joints there need a sealant that can flex and stay put.
Each job carries a 12-month guarantee.
- Place
- Tunbridge Hill (ME3)
- Region
- Medway
- Guarantee
- 12 months on all our work
- Price
- A clear price before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Should I try it myself first?
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
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.
What we do, step by step
We work through the job in order: protect, prepare, seal, tidy. Typically it takes anything from a few hours to several days, depending on the building and we leave things clean and tidy. Somewhere as small as Tunbridge Hill, access is often the only tricky part. 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.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
How to prepare
- Let us know about stairs, lifts or work at height
- Where the joints are inside, avoid wetting them before we arrive
- Keep children and pets away from the work area
Getting a quote
We do not publish a price list, because every job is different. Instead, your job gets its own clear quote. To get started, ring 0345 464 0079 or drop us an email.
Related advice
When to call us in Tunbridge Hill
Using the wrong sealant is another common reason. A stiff, general-purpose sealant cannot cope with a joint that moves a lot, and it tears off the sides.
Look out for any of the following:
- Movement joints filled with mortar instead of sealant
- Damp patches traced to an open external joint
- Hard, crazed mastic that has stopped moving
- Gaps where render, brick and frames meet
Letting a property close to Gillingham (Kent) station? Then split movement joints are easy to miss on a rental until damp shows inside.
What to look for in a quote
- Whether the sealant suits the joint
- Who turns up on the day
- Is VAT in the price?
- What happens if the job turns out different
How to look after the new joints
So the new joints stay in good condition:
- Ask before painting over external sealant
- Never let anyone fill a movement joint with mortar
- Look over the joints every year, ideally after winter
- Keep soil, plants and ivy away from the joints
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They should be kept open and resealed, not filled.
If you can see gaps, plants or bare sections in a joint, have it checked. Earlier resealing means a smaller job and a better result.
FAQs for Tunbridge Hill
Does the coastal weather in Tunbridge Hill affect outside sealant?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Can you help a landlord with a rental near Gillingham (Kent) station?
Yes. We work for landlords and agents as well as householders, and several properties can be quoted together. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we will give you a clear price.
Is it OK to seal over old sealant?
No. Fresh sealant does not stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Do you work at height?
It depends on the height and the site. Ground-floor joints are simple; for higher work, tell us about the building and we’ll confirm what’s needed.
Should I point up the gap in my brickwork?
No. A mortar-filled joint can’t move, so the wall cracks somewhere else instead. It needs a flexible sealant over backing rod.
Can you work on commercial sites?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. We can talk about working times when we quote.
Can I do it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
What’s an expansion joint in brickwork?
A vertical gap in a long brick wall is generally a movement joint. It lets the bricks expand without cracking.
Different surfaces, different methods
Cladding and façade panels
Cladding and façade panels are usually separated by sealed joints. Each joint gets a sealant that suits the panel and its movement.
Render joints
Water behind render can lead to blown patches. A sound joint keeps the render dry behind and protects the render itself.
Towns and villages near Tunbridge Hill
More services for Tunbridge Hill
Landlords, agents and businesses in Tunbridge Hill
Hotels need rooms back in use, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
What external mastic looks like in Tunbridge Hill
Tunbridge Hill is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on movement joints and outside wall joints, especially on the side facing the sea. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you look after a building such as The Hundred of Hoo Academy, its movement joints, gutters and trims need looking after like any other building’s.
Tunbridge Hill is about 5 miles north of Gillingham, in Medway. Every kind of property in Tunbridge Hill is covered for external mastic. Every job comes with our one-year guarantee. Tunbridge Hill is one of 68 towns and villages in Medway we cover for external mastic. Chelmsford is on our list too, about 21 miles from Tunbridge Hill.
We work across ME3 for external mastic and the streets around it. If you’re just outside Tunbridge Hill, we cover Kingsnorth (1 mile south), Fenn Street (1 mile north-west), Sharnal Street (1 mile north-west), St Mary Hoo (2 miles north) and High Halstow (2 miles north-west). Further out, we also cover Gillingham (5 miles south), Chatham (6 miles south-west), Rochester (5 miles south-west), Rainham (5 miles south), Strood (6 miles south-west) and Luton (5 miles south-west).
Local landmarks in Tunbridge Hill
The closest station to Tunbridge Hill is Gillingham (Kent) station, roughly 3.9 miles south-west of the centre. Other landmarks nearby include Medway Maritime Hospital (4.5 miles south-west) and Upnor Castle (3.6 miles south-west). Green spaces nearby include Bishop Saltings.
What sealant work can’t fix
We’d rather tell you now than do work that will not last, so these are the limits:
- Adding movement joints to masonry that has none
- Cracked brickwork or render that needs a builder or plasterer
- Subsidence or other structural problems
If you are not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer before you book.
Joints and surfaces we work on
- Copings & trims
- Joints between brick and frames
- Concrete & block
- Render & cladding joints
- Façade panels
- Brickwork movement joints