Kent · England
Ebbsfleet Valley External Mastic
External mastic across Ebbsfleet Valley and nearby, with old sealant always removed completely.
- Joints pointed up with cement by mistake
- Old sealant gone brittle and cracked
- Panel joints letting water in
External mastic in Ebbsfleet Valley, done properly
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, leaving it bonded to two faces so it can move with the wall. We’re often asked to deal with sealant that has lost its bond to the brick or render and plants rooting in failed movement joints, across copings & trims, façade panels and render & cladding joints.
Outbuildings, garages and conservatories around homes in places like Ebbsfleet Valley add more joints to look after. Leaks generally start at a gutter end, a garage door frame or where an extension meets the house.
There’s a 12-month guarantee on every job, whatever its size.
- Place
- Ebbsfleet Valley (DA10)
- Region
- Kent
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Signs you need external mastic in Ebbsfleet Valley
Many joints fail because they were sealed too deep or with nothing behind them. If the sealant sticks to the back as well as the sides, it can’t stretch and rips as the joint opens.
Any of these means the joints need attention:
- Hard, crazed mastic that has stopped moving
- Failed seals between different materials
- Rigid filler in a joint that should flex
- Joints where the bead has come unstuck
Rented homes near Ebbsfleet International station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets.
Questions to ask before booking
- How hidden problems are handled
- How the joint is cleaned and prepared
- The length of the guarantee
- Who does the work, and how experienced they are
Why deal with it now?
Sealing over the top of old mastic doesn’t hold for long. New sealant doesn’t bond well to old, weathered sealant, so the old joint is cut out fully first. Around Ebbsfleet Valley, water from a failed joint in an older home can soak into timber and plaster, and that’s a much bigger job than renewing the sealant.
Combining jobs into one visit is normally more efficient than separate visits, so it’s worth mentioning everything you’d like done. You will get one clear quote for the whole job.
Why choose Mr Mastic in Ebbsfleet Valley
- You choose the colour before work begins
- We are fully insured
- Homes, businesses and hotels
- Quality sealants from Arbo and Everbuild
Ebbsfleet Valley: your questions answered
Is Ebbsfleet Valley within the area you cover?
Yes, we do. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
I let a flat near Ebbsfleet International station. Can you help?
Yes, landlords and agents are among the people we work for. You can ring 0345 464 0079 or email us with the details for a clear quote.
Where is Mr Mastic based?
We are based in Crawley, and we work across South East England, London and Scotland.
Do you use backing rod?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. Then the sealant bonds to two faces and can move.
Do you take out the old sealant first?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
How long does external mastic last?
It varies from wall to wall: sunny, exposed elevations and busy joints wear faster. Check them each year and reseal when they split or harden. Our work comes with a 12-month guarantee.
What is a movement joint?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It should be filled with flexible sealant, never mortar.
Do you have insurance?
Yes, we are fully insured for every job we do.
What we do, step by step
The work is kept neat and contained to the area we are working on. The job generally takes anything from a few hours to several days, depending on the building, and we tell you how long to leave it before we go. Parking around Ebbsfleet Valley is usually easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- First we look over the joints with you, agree which to renew and talk through access.
- We cut out the failed sealant and rake out any dirt or growth.
- Both sides are cleaned back to sound material and primed if needed.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Before we arrive
- Move anything stored near the joints
- Mention any leaks or damp you’ve noticed
- Tell us about access, such as stairs, a lift or high-level joints
Getting a quote
To get a quote, call 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.
Advice
Landlords, agents and businesses in Ebbsfleet Valley
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will quote.
What affects the cost of external mastic
Your quote is based on your job. We take into account:
- How many areas need sealing
- Working hours on commercial sites
- Any mould that needs treating
- Whether old sealant or filler has to be cut out
The cost reflects the work involved, not a rough estimate. That’s why we ask a few questions first and agree the price before starting.
Helping us quote
When you call or email, these details help:
- The problem you’ve noticed
- Photos by email, if that’s easy
- Any access issues, like height or stairs
- Any previous sealing or DIY work
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.
Places near Ebbsfleet Valley
Other services in Ebbsfleet Valley
Different surfaces, different methods
Joints between dissimilar materials
Wherever two materials meet, they move differently. A flexible sealant bridges the two so the movement is taken up.
Copings and trims
A failed coping joint lets water into the top of the wall. Resealing them is a small job that protects a lot.
What external mastic looks like in Ebbsfleet Valley
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Managing a site like Cherry Orchard Primary Academy? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. For an older house near a landmark such as Parish Church of St Peter and St Paul, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Ebbsfleet Valley is about 2 miles west of Northfleet, in Kent. Ebbsfleet Valley gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Our area takes in 922 places across Kent, large and small. For nearby work, see our London page (18 miles or so).
We work across the DA10 postcode area for external mastic. We cover properties on Cherry Orchard, Tomalin Drive and Mackerness Road and the roads around them. Other places close to Ebbsfleet Valley include Betsham (1 mile south), Springhead (1 mile east), Painters Ash (2 miles south-east), Southfleet (2 miles south-east) and Hook Green (2 miles south). Within a short drive, we also cover Maidstone (15 miles south-east), Dartford (3 miles west), Sevenoaks (12 miles south-west), Gravesend (3 miles east), Swanley (6 miles south-west) and Kings Hill (12 miles south).
Landmarks near Ebbsfleet Valley
We work in homes and buildings around Castle Hill Park, The Blue Anchor pub and The Ebbsfleet Academy and the streets around them. The closest station to Ebbsfleet Valley is Ebbsfleet International station, about 0.9 miles north-east of the centre. Nearby you will also find Stone Castle (1.2 miles north-west) and Stone Museum of Geology (2.7 miles west). Not far away are Chafford Gorges Nature Park and Sawyers Lake.
Looking after it afterwards
Aftercare is simple:
- Fix overflowing gutters above sealed joints
- Keep soil, plants and ivy away from the joints
- Leave the joints unpainted unless we have said otherwise
- Avoid pressure-washing directly into sealant joints
Only paint over the joint if we have confirmed the sealant can take paint. Paint can crack on a flexible joint.
Once a joint cannot move, the wall finds another way, normally as cracking in the brickwork or render nearby. Catch it early and you reduce the risk.