Kent · England
External & façade joints in Hazelwood, Kent
Specialist external mastic for Hazelwood: careful preparation, the right product and tidy work. Call for a quick quote.
- Sealant pulling away from one side of the joint
- Brick movement joints where the sealant has split
- Water getting into walls through failed joints
About our external mastic in Hazelwood
Getting the depth right is half the job. 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 have brick movement joints where the sealant has split and plants rooting in failed movement joints, we can put it right, on façade panels, copings & trims and concrete & block alike.
Around Hazelwood, older buildings can be stone, brick or timber-framed, many with extensions added later. Where one material meets another is where water generally gets in, and they need the right sealant at the right depth.
All our work comes with a 12-month guarantee.
- Location
- Hazelwood (TN14)
- Wider area
- Kent
- Guarantee
- One year on every job
- Price
- A clear price before we start
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Keeping the joints in good condition
Good habits help new joints last longer. Our tips:
- Wash walls gently around the sealant
- Keep soil, plants and ivy away from the joints
- Check the sealant is paintable before painting near it
- Never let anyone fill a movement joint with mortar
Have a quick look at the joints each spring. Watch for splits, edges coming away or growth in the joint.
Water getting behind cladding or render can go unnoticed for a long time. By the time there’s a damp patch, the damage can be well established, so it’s worth resealing at the first signs.
Honest limits
Before you book, it’s worth knowing the limits too:
- Adding movement joints to masonry that has none
- Cracking across the wall rather than at a joint
- Movement that is more than a sealant joint can take
Not sure which it is? You can ring 0345 464 0079 or email us and we will tell you honestly.
What we seal
- Render & cladding joints
- Concrete & block
- Façade panels
- Joints between brick and frames
- Brickwork movement joints
- Copings & trims
Questions from Hazelwood
Do you cover smaller places like Hazelwood?
Yes, Hazelwood is covered. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Can you help a landlord with a rental near Chelsfield station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or email us and tell us about the property, and we will give you a clear price.
Why do you put foam in the joint first?
That is backing rod, a closed-cell foam. It stops the sealant going in too deep and bonding to three sides, which would stop it stretching.
How long does the job take?
As a guide, most jobs take a few hours to a few days, depending on the length of joint and the access. Larger jobs naturally take longer, and we’ll say how long yours will take.
Can I do it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Why is there a gap in my brick wall?
Walls move with heat, cold and moisture, and planned joints take up that movement. The gap is sealed with a flexible sealant over backing rod.
Do you remove the old sealant?
Yes, every time. New sealant won’t bond properly to old, so the joint is cleaned back first.
Will the new joint stand out?
We aim for a joint that suits the wall rather than one that jumps out. We will talk through colour options before we start, matched as closely as the range allows.
Common problems we fix in Hazelwood
Every building moves. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. All of that ends up in the joint sealant.
Common reasons people contact us include:
- Weeds or debris growing in open joints
- Panel joints letting water in
- Rigid filler in a joint that should flex
- Joints where the bead has come unstuck
For landlords with property near Chelsfield station, outside joints that have cracked can let damp into a rental, so check them between lets.
What to look for in a quote
- How long to leave it before use
- How the colour is chosen
- Are they insured?
- What product goes in the joint
What the job involves on each surface
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 coloured to suit the wall.
Copings and trims
Coping joints that leak let water straight down into the wall. Sealing them early saves the wall below.
What happens on the day
Good joint work is mostly preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. In total, it normally takes a few hours to a few days, depending on the length of joint and the access. Somewhere as small as Hazelwood, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by checking each joint, agreeing the ones to redo and how we will 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.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Getting ready for the visit
- Keep pets and children clear of the area while we work
- Let us know about parking restrictions
- For business premises, tell us about site rules or sign-in
How to get a quote
For external mastic in Hazelwood, ring 0345 464 0079 or drop us an email. Tell us what the problem is and where, and you’ll get a clear quote before work begins.
Related advice
Towns and villages near Hazelwood
Other services in Hazelwood
Why deal with it now?
Pointing a movement joint with mortar might seem a neat fix, but it locks the joint solid. The movement then cracks the brickwork or render nearby. The correct repair is a flexible sealant with the right backing. Older cottages and farmhouses around Hazelwood can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
The cost depends on the size of the job, how much old material has to come out and how easy the joints are to reach. You’ll have a clear quote before any work starts, so you know where you stand.
Why book with us
- Arbo and Everbuild products
- Neat joints and a tidy finish
- A 12-month guarantee on all work
- Full insurance on every job
Take a look at our cost guide and customer reviews.
Quotes for external mastic in Hazelwood
Every job gets its own quote. This is what makes a difference:
- How many rooms, windows or areas are involved
- The size of the job
- Access and height
- When we can work, for business premises
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we’ll go through it with you.
Helping us quote
Photos by email are helpful but not essential. Try to tell us:
- Where the job is, and your postcode
- How many joints, rooms or windows are involved
- What’s wrong with the joints now
- Whether it has been sealed before
We don’t publish a price list, as no two jobs are quite the same. Instead, we send you a clear quote for your job. To arrange one, phone 0345 464 0079 or email us.
Outside joints around Hazelwood
Historic houses like Down House (about 1 mile west) are a reminder that the area around Hazelwood has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Managing a site like Downe Primary School? Then its movement joints, gutters and trims need looking after like any other building’s. In the older streets around St Mary's Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
Hazelwood is about 4 miles south of Orpington, in Kent. From the centre of Hazelwood to the outskirts, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Our Kent coverage runs to 922 places, Hazelwood among them. You can also see our page for London, roughly 14 miles from Hazelwood.
We work across TN14 for external mastic. Streets in the area include Hazelwood Road, Cudham Lane North and Spinney Way, all of which we cover. Close by, we work in Downe (1 mile west), Luxted (1 mile south-west), Cudham (1 mile south), Single Street (1 mile south-west) and Green Street Green (1 mile north-east). Larger places within reach include Dartford (10 miles north-east), Sevenoaks (6 miles south-east), Gravesend (15 miles north-east), Tonbridge (13 miles south-east), Northfleet (14 miles north-east) and Swanley (6 miles north-east).
Near you in Hazelwood
In Hazelwood, that means homes and buildings near George and Dragon pub and Green Street Green Primary School. The nearest railway station is Chelsfield station, about 2.1 miles north-east. Well-known places in the area include Orpington Hospital (2.1 miles north-east) and Crofton Roman Villa (2.7 miles north). Not far away are Betsom's Hill and Downe Bank Nature Reserve.