West Sussex · England
External & façade joints in Lumley, West Sussex
Sealing brickwork movement joints, render, cladding and façade joints for householders, landlords and businesses in Lumley. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Movement joints with cracked, split or missing sealant
- Plants rooting in failed movement joints
- Joints where the bead has come unstuck
How to look after the new joints
How long the joints last depends on use and care. Here’s what we suggest:
- Look over the joints every year, ideally after winter
- Show decorators and builders where the movement joints are
- Make sure movement joints are not pointed over
- Keep water from gutters off the wall
Only paint over the joint if we have confirmed the sealant can take paint. Paint can crack on a flexible joint.
If you can see gaps, plants or bare sections in a joint, have it checked. Early work is quicker and leaves a better finish.
External mastic in Lumley
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. If you have plants rooting in failed movement joints and joints with sealant missing in places, we can help.
Older homes in small places like Lumley may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water usually gets in.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we will put it right.
- Place
- Lumley (PO10)
- Wider area
- West Sussex
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Should I try it myself first?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
Lumley: your questions answered
Do you work for landlords with property near Emsworth station?
Yes, we work for letting agents and landlords. You can phone 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before we start.
Is Lumley within the area you cover?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Do you use backing rod?
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.
Are you insured?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
Where do you work from?
We’re based in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
Is it OK to fill a movement joint with cement?
No. A mortar-filled joint cannot move, so the wall cracks somewhere else instead. Use a flexible sealant with backing rod.
Is there a guarantee?
Yes. There’s a 12-month guarantee on every job.
What colours does the sealant come in?
We choose a sealant colour to suit the brick, stone or render, so the joint sits quietly in the wall. There’s a wide choice of exterior colours.
External mastic in Lumley: local notes
Lumley is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That is hard on movement joints and outside wall joints, especially on the side facing the sea. 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.
Letting a property close to Emsworth station? Then outside joints that have cracked can let damp into a rental, so check them between lets. For an older house near a landmark such as Church of St James, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Lumley is about 1 mile east of Emsworth, in West Sussex. We provide external mastic to homes and businesses in Lumley and the surrounding area, as part of our work across West Sussex. Our West Sussex coverage runs to 371 places, Lumley among them. You can also see our page for Portsmouth, roughly 7 miles from Lumley.
Postcode districts we cover here for external mastic: PO10. Local streets include Lumley Road and Northlands Park, and we cover them all. Other places close to Lumley include Emsworth (1 mile west), Westbourne (1 mile north), Southbourne (1 mile east), Woodmancote (1 mile north-east) and Denvilles (1 mile west). Larger places within reach include Bognor Regis (12 miles east), Chichester (7 miles east), Selsey (10 miles south-east), Portfield (7 miles east), Yapton (14 miles east) and East Wittering (7 miles south-east).
Near you in Lumley
Locally, jobs take us to homes and businesses close to Eames Farm, Bourne Community College and Lord Raglan P.H. Pub, among other places. Lumley has its own railway station: Emsworth station. Well-known places in the area include Warblington Castle (1.6 miles west) and Emsworth Museum (less than half a mile south-west). Not far away are Stoke Down and Brook Meadow (Emsworth).
Why act early in Lumley
The longer a joint stays open, the more water the wall takes in. Wet masonry is more easily damaged by frost near the open joint, so the damage spreads beyond the joint. Around Lumley, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
What you pay reflects the work, not a rough estimate. That’s why we ask a few questions first.
Why us?
- A choice of colours where the product allows
- Every job guaranteed for a year
- Any old sealant cut out fully, not covered over
- An ARBOMaster approved applicator
Different surfaces, different methods
Concrete and blockwork
The face of concrete or block is often dusty, so preparation is key. We prime where the sealant needs it.
Cladding and façade panels
Metal and composite panels move a lot with temperature, so the joints work hard every day. The sealant is chosen with that in mind.
What sealant work cannot fix
Sealant isn’t the answer to every problem, and we’d rather say so up front. Sealant won’t put right:
- Rising or penetrating damp from elsewhere in the wall
- Subsidence or other structural problems
- Cracking across the wall rather than at a joint
Not sure which it is? You can call 0345 464 0079 or drop us an email and we will tell you honestly.
Where we work in Lumley
- Render & cladding joints
- Copings & trims
- Joints between brick and frames
- Façade panels
- Concrete & block
- Brickwork movement joints
When to call us in Lumley
Some movement joints have been pointed up with mortar. The joint cannot move, so the wall cracks somewhere else instead.
Common reasons people contact us include:
- Water getting into walls through failed joints
- Moss and dirt in joints with no sealant left
- Movement joints with cracked, split or missing sealant
- Leaking joints around cladding and façade panels
Managing a site like St James Church of England Controlled Primary School? Then larger buildings have long runs of movement joint that eventually need resealing.
Questions to ask before you book
- Whether VAT is included
- What happens if the job turns out different
- Who turns up on the day
- What the cure time is
How the visit works
There is not much for you to do on the day. Point us to the joints and we will get on with it. The work itself takes a few hours for a handful of joints, longer for a whole elevation from start to finish. In a small place like Lumley, access is normally the main thing to plan. 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.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
How to prepare
- Mention any sign-in or site rules at work premises
- Tell us about any water getting in
- Plan for the work area to be out of bounds to pets and children
Get a quote
There’s no standard price list. Instead, we give you a clear price for your job. To arrange one, phone 0345 464 0079 or drop us an email.