Kent · England
External & façade joints in Kennington, Kent
External mastic in Kennington from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Failed seals between different materials
- Weeds or debris growing in open joints
- Rigid filler in a joint that should flex
External mastic in Kennington
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Porous or awkward surfaces are primed where the sealant needs it, and we don’t skip that step. If you are dealing with sealant pulling away from one side of the joint and moss and dirt in joints with no sealant left, we can put it right, whatever the surface.
In a smaller place like Kennington, some homes face open ground, and walls and rooflines facing the weather take the worst of it. Joints on those sides are usually the first to go.
The work is covered for a year after we finish. If there’s a problem with it, please phone 0345 464 0079 or email us.
- Where
- Kennington (TN24, TN25)
- Region
- Kent
- Guarantee
- One year on every job
- Quotes
- A clear price before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Kennington: your questions answered
Will you come out to Kennington?
Yes. Kennington is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Is Kennington in your area for external mastic?
Yes. Our work covers London and the South East, and Kennington is part of that. You can ring 0345 464 0079 or email us and tell us what needs doing.
Is it OK to seal over old sealant?
No. Fresh sealant doesn’t stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Can you seal joints between two different materials?
Yes. We cut out the old sealant, prepare both faces and reseal with a flexible exterior product. The colour is chosen to suit.
Do you work for letting agents?
Yes. We work for homeowners, landlords, letting agents, businesses and hotels.
Which products do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We’ll tell you what we are using and why.
Can you reach joints on upper floors?
Each building is different. Send us pictures and a rough idea of the height and we’ll confirm how they can be reached safely.
I’m a tenant. Can you help?
Of course. Ask your landlord first, and we can send them the quote if that helps.
Also near Kennington
Also in Kennington
Looking after it afterwards
So the new joints stay in good condition:
- Check the sealant is paintable before painting near it
- Keep movement joints as flexible joints, not mortar
- Have failed joints looked at early
- Wash walls gently around the sealant
Avoid pressure-washing straight into the joints. High-pressure water can lift the edges over time.
Once a joint can’t move, the wall finds another way, normally as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
The process
On the day, there’s very little for you to do. Show us the job and we will take it from there. The work itself takes a few hours for a handful of joints, longer for a whole elevation, including the tidy-up. A visit to Kennington is planned like any other: the time, the access and where to park are agreed in advance. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- The old mastic and anything lodged in the joint is removed.
- We clean both faces of the joint and prime them where the product calls for it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
How to prepare
- Keep children and pets away from the work area
- Move anything stored near the joints
- Let us know if you’ve seen damp or leaks
How to get a quote
To get a quote, call 0345 464 0079 or send us an email with the location and a short description of the problem. You will have a clear quote before we start.
Read more
Landlords, agents and businesses in Kennington
If you manage several properties in or around Kennington, several properties can be quoted together. Send us the addresses and the work at each.
We work for letting agents and landlords as well as householders. Resealing between tenancies keeps a property looking cared for before the next move-in.
What the job involves on each surface
Render joints
Water behind render can lead to blown patches. A sound joint keeps the render dry behind.
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. They’re resealed over backing rod with a low-modulus sealant.
Quotes for external mastic in Kennington
For a quick quote, just ask. The main things that affect it are:
- Any mould that needs treating
- Any working-time requirements on site
- Whether old sealant or filler has to be cut out
- The number of rooms or windows
A failed joint rarely gets cheaper to fix by waiting. If you are unsure, phone 0345 464 0079 or email us and we will give you an honest view and a quote.
Asking for a quote
You do not need to know the technical terms. It helps if you can tell us:
- How many joints, rooms or windows are involved
- The problem you’ve noticed
- Where the job is, and your postcode
- Whether it’s a home or a business
Need a quote? Please phone 0345 464 0079 or drop us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
What happens if it’s left?
Sealing over the top of old mastic doesn’t hold for long. New sealant does not bond well to old, weathered sealant, so the old joint is cut out fully first. In a smaller place like Kennington, wherever a wall is exposed, a failed outside joint is a real source of damp. Inside, a split seal lets water into floors and panels just as it would anywhere.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Ask us for a quote and we will go through it with you.
Why Kennington clients choose us
- Quality sealants from Arbo and Everbuild
- We agree the colour with you first
- A 12-month guarantee on all work
- Tidy, careful work
Take a look at what affects the cost and customer reviews.
Walls and rooflines in Kennington
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. Historic houses like Godinton House (about 2.3 miles west) are a reminder that the area around Kennington has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
For site and facilities teams at buildings such as Kennington Church of England Academy, larger buildings have long runs of movement joint that eventually need resealing. If you live in an older home near Church of St Mary, an extension built onto an older house moves differently, and the joint between them takes the strain. If you let a flat or house near Ashford International station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Kennington is about 2 miles north-east of Ashford, in Kent. If you need external mastic in Kennington, please phone 0345 464 0079 or email us for a quick quote. We cover Kent from our Crawley base, Kennington included. Kennington is one of 922 towns and villages in Kent we cover. Our Chelmsford page covers work nearby.
We cover every part of the TN24 and TN25 postcode area for external mastic and the streets around it. Local streets include Park Road, York Road and Ball Lane, all of which we cover. Kennington sits on or near the A28. Close by, we work in Bockhanger (1 mile south-west), Potters Corner (1 mile west), Boughton Lees (2 miles north), Godinton (2 miles south-west) and Willesborough (2 miles south). Larger places within reach include Canterbury (12 miles north-east), Sittingbourne (14 miles north-west), Folkestone (13 miles south-east), Whitstable (14 miles north-east), Faversham (10 miles north) and Hythe (11 miles south-east).
Landmarks near Kennington
Locally, jobs take us to homes and businesses close to Towers School and Sixth Form Centre, Conningbrook Lakes Country Park and The Rose Inn and the streets around them. Kennington’s nearest station is Ashford International station, roughly 1.7 miles south. Other landmarks nearby include County Square (1.4 miles south-west) and William Harvey Hospital (2.1 miles south-east). For a walk, there’s Hatch Park.
What sealant work can’t fix
We will always be straight with you, so here’s what sealant can’t fix:
- Walls that need new movement joints cut into them
- Damp that is not coming from the joint
- Cracking across the wall rather than at a joint
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we’ll tell you honestly before booking.
Joints and surfaces we work on
- Concrete & block
- Façade panels
- Render & cladding joints
- Copings & trims
- Joints between brick and frames
- Brickwork movement joints