Kent · England
External & façade joints in Hartley, Kent
Sealing brickwork movement joints, render, cladding and façade joints in Hartley, with a one-year guarantee on every job. Call for a quick quote.
- Movement joints filled with mortar instead of sealant
- Hard, crazed mastic that has stopped moving
- Weeds or debris growing in open joints
What the job involves on each surface
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. Their movement joints are sealed over backing rod with a flexible sealant.
Brickwork movement joints
People sometimes point up a brick movement joint by mistake. If that is happened, we rake it out and reseal it properly where it can be done safely.
External mastic in Hartley
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. The colour is chosen to suit the brick or render so the joint does not stand out. If you have cracked joints where brick meets render or frames and joints where the bead has come unstuck, we can put it right, whatever the surface.
In a smaller place like Hartley, some homes face open ground, so exposed walls and rooflines take more wind-driven rain. Joints on those sides are generally the first to go.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Location
- Hartley (DA3)
- Region
- Kent
- Cover
- One year on every job
- Quote
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What else we do in Hartley
What we are called out for in Hartley
The wrong product in a moving joint is a classic cause. A high-modulus or general-purpose sealant can be too rigid for a busy joint, so it pulls away from the edges.
People usually contact us after spotting one of these:
- Joints pointed up with cement by mistake
- Weathered mastic that no longer stretches
- Moss and dirt in joints with no sealant left
- Cracked joints where brick meets render or frames
Letting a property close to Longfield station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
What your quote should include
- What guarantee comes with the work
- Whether you can choose the colour
- Whether the sealant suits the joint
- How the surfaces are prepared before sealing
When something else is needed
Before booking, it’s worth knowing the limits too:
- Adding movement joints to masonry that has none
- Loose or hollow render, which needs re-rendering
- Subsidence or other structural problems
If you’re not sure, just ring 0345 464 0079 or send us an email and we’ll give you a straight answer.
Surfaces we seal
- Brickwork movement joints
- Concrete & block
- Copings & trims
- Render & cladding joints
- Joints between brick and frames
- Façade panels
What external mastic looks like in Hartley
Historic houses like Cobham College (about 3.9 miles east) are a reminder that the area around Hartley has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For site and facilities teams at buildings such as Hartley Primary Academy, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. Homes close to Church of Saint Mary include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move.
Hartley is about 4 miles south-west of Northfleet, in Kent. Hartley gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a 12-month guarantee. Our Kent coverage runs to 922 places, Hartley among them. Our London page covers work nearby.
Every address in DA3 is within our area for external mastic, from the main roads to the quietest streets. We cover properties on Church Road, Dickens Close and Stack Lane. We also cover Longfield (1 mile north), New Barn (1 mile north-east), Longfield Hill (1 mile east), New Ash Green (1 mile south) and Nash Street (2 miles east). Further out, we also cover Maidstone (13 miles south-east), Dartford (5 miles north-west), Sevenoaks (9 miles south-west), Gravesend (4 miles north-east), Tonbridge (13 miles south) and Northfleet (4 miles north-east).
Local landmarks in Hartley
In Hartley, that means homes and buildings near Railway Tavern, Rectory Meadow and Longfield Academy and the streets around them. For rail, the closest station is Longfield station, about 0.8 miles north-west. Other landmarks nearby include Darent Valley Hospital (4 miles north-west) and Stone Castle (4.1 miles north). The countryside around Hartley includes Sawyers Lake.
Your questions about external mastic in Hartley
Is Hartley in your area for external mastic?
Yes, Hartley is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job.
Will you come out to Hartley?
Yes. Hartley 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.
What should I tell you?
The location, the problem and the rough size of the job. Photos by email help too.
Is it messy?
No. The area is protected while we work and cleaned up afterwards.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status and we are fully insured too.
How much does external mastic cost in Hartley?
Every job is different, so each one gets its own quote. To get one, phone 0345 464 0079 or drop us an email with a short description of the job.
What colours does the sealant come in?
The sealant colour is picked to suit the wall. Exterior sealants come in a good range of colours.
Can you quote for more than one area?
Yes. Several rooms, windows or areas can go on one quote.
How it works
Before we leave, we go over the finished joints with you and tell you how long to leave it. The work normally takes a few hours for a handful of joints, longer for a whole elevation, depending on the size of the job. A visit to Hartley 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 start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- 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.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Getting ready for the visit
- Let us know about earlier repairs to the joints
- Mention any leaks or damp you’ve noticed
- Mention any tricky access
How to get a quote
Need a quote? Please phone 0345 464 0079 or send us an email with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Read more
Should I try it myself first?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Aftercare tips
Looking after new joints is easy:
- Never let anyone fill a movement joint with mortar
- Check the sealant is paintable before painting near it
- Avoid pressure-washing directly into sealant joints
- Point out the joints to other trades
Look over the joints once a year, ideally after winter. Splits, gaps at the edges or plants in the joint are early warning signs.
Once a joint cannot move, the wall finds another way, often as cracks near the joint. Resealing it early helps prevent that.
Landlord and commercial work in Hartley
We work for landlords and agents as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
Failed sealant is one of the commonest items on a check-out report. We can quote for more than one property at once.