Kent · England
Larkfield External Mastic
External mastic for Larkfield, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Sealant that has lost its bond to the brick or render
- Movement joints filled with mortar instead of sealant
- Moss and dirt in joints with no sealant left
Do you need external mastic in Larkfield?
If plants are growing out of a joint, the sealant has usually failed or was never there. Dirt and roots then trap moisture in the joint and speed up the damage.
Keep an eye out for any of the following:
- Joints with sealant missing in places
- Weeds or debris growing in open joints
- Rain getting behind render or cladding at a joint
- Sealant pulling away from one side of the joint
Homes close to Church of the Holy Trinity include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
What your quote should include
- Is the old sealant removed completely?
- When the joint can take water or movement
- What preparation is included
- What product goes in the joint
External mastic for homes and businesses in Larkfield
External mastic is a job where short cuts show quickly. Overfilled joints, missing backing rod and sealant laid over old sealant rarely last long. We strip the joint back and start again. Common call-outs are for water getting into walls through failed joints and hard, crazed mastic that has stopped moving, on brickwork movement joints, concrete & block and façade panels.
External sealant needs dry, clean surfaces, so work around Larkfield is planned for dry weather. Tell us about access to all sides of the building, including outbuildings and garages.
Every job is covered by our 12-month guarantee.
- Where
- Larkfield (ME20, ME19)
- Wider area
- Kent
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What the job involves on each surface
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. We reseal them with a low-modulus sealant over backing rod in a colour to suit the brick.
Copings and trims
Coping joints that leak let water straight down into the wall. Resealing them is a small job that protects a lot.
Outside joints around Larkfield
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. With historic houses such as Starkey Castle (about 4.3 miles north) nearby, there’s older building stock in the area around Larkfield as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
Schools such as Brookfield Junior School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. For landlords with property near New Hythe station, split movement joints are easy to miss on a rental until damp shows inside.
Larkfield is about 4 miles north-west of Maidstone, in Kent. If you need external mastic in Larkfield, it’s easy to get a quote: please ring 0345 464 0079 or email us. We are based in Crawley and cover Kent. Our area takes in 922 places across Kent. Our London page covers work nearby (27 miles or so).
Every address in ME20 and ME19 is within our area for external mastic, from the main roads to the quietest streets. External mastic is available to properties on Martin Square, London Road and New Hythe Lane and the roads around them. Neighbouring places we cover for external mastic include Lunsford (1 mile north), Leybourne (1 mile west), New Hythe (1 mile north-east), Birling (2 miles north-west) and Snodland (2 miles north). Within a short drive, we also cover Maidstone (4 miles south-east), Sittingbourne (13 miles east), Dartford (14 miles north-west), Sevenoaks (11 miles west), Royal Tunbridge Wells (14 miles south-west) and Gravesend (9 miles north).
Landmarks near Larkfield
Locally, jobs take us to homes and businesses close to The Malling School, The Malling School and Leybourne Lakes Country Park, among other places. For rail, the closest station is New Hythe station, roughly 1 mile north-east of the centre. Well-known places in the area include Fremlin Walk (3.9 miles south-east) and Leybourne Castle (0.9 miles west). Green spaces nearby include Burham Down and Blue Bell Hill.
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. A few tips:
- Make sure movement joints aren’t pointed over
- Deal with leaking gutters that soak the joints below
- Ask before painting over external sealant
- Point out the joints to other trades
Have a quick look at the joints each spring. Watch for splits, edges coming away or growth in the joint.
An open movement joint lets rain into the wall every time it pours. Over time it can mean damp inside, stained render or frost-damaged brick, all bigger jobs than a reseal.
How we quote for external mastic
We quote each job individually. This is what makes a difference:
- How easy the joints are to reach
- The type of sealant required
- Working hours on commercial sites
- Any mould that needs treating
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
What we need to know
When you contact us, these details help:
- Whether it has been sealed before
- Any access issues, like height or stairs
- What’s wrong with the joints now
- Where the property is
We do not publish a price list. Instead, we give you a clear price for your job. To arrange one, ring 0345 464 0079 or drop us an email.
Can I do it myself?
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so just mention it when you contact us.
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Other services in Larkfield
When it is not the sealant
To be straight with you, some problems need a different trade:
- Cracked brickwork or render that needs a builder or plasterer
- Cutting new joints into brickwork, which is building work rather than sealant work
- Render that is blown, hollow or coming away
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly.
Where we work in Larkfield
- Render & cladding joints
- Brickwork movement joints
- Concrete & block
- Joints between brick and frames
- Copings & trims
- Façade panels
Questions from Larkfield
Can you do external mastic in Larkfield?
Yes. Our work covers London and the South East, and Larkfield is part of that. Just phone 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear price.
Do you work for landlords with property near New Hythe station?
Yes. We work for letting agents and landlords as well as householders, and several properties can be quoted together. You can phone 0345 464 0079 or drop us an email with the details for a clear quote.
Why do you put foam in the joint first?
We fit closed-cell backing rod wherever the joint depth needs controlling. It sets the sealant depth and prevents three-sided bonding so the bead can stretch.
Is it OK to fill a movement joint with cement?
No, not where the gap is a movement joint. Pointing it stops it working, and the wall may crack nearby. We’ll reseal it with a flexible sealant.
Where do you work from?
We’re a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
Will you leave a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
Do you have insurance?
Yes. We’re fully insured.
Do you work at height?
That depends on how high the joints are and the ground below. Low-level joints are straightforward; for higher ones, send details and we’ll confirm the access.
How the visit works
We work through the job in order: protection first, then preparation, sealing and a tidy-up. Typically it takes anything from a few hours to several days, depending on the building. Somewhere as small as Larkfield, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Mention any sign-in or site rules at work premises
- Mention if the joints have been sealed before
Getting a quote
Call for a quick quote, or email us if that is easier. Tell us about the joints that need doing and we’ll talk you through the work and send you a clear quote.