Greater London · England
Rowley Green External Mastic
Our applicators work in Rowley Green on sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Moss and dirt in joints with no sealant left
- Movement joints filled with mortar instead of sealant
- Failed sealant between panels on a façade
Different surfaces, different methods
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.
Render joints
Rendered walls have joints at beads, openings and changes of material. They’re resealed in a sealant that suits the render.
About our external mastic in Rowley Green
On houses, flats and commercial buildings across Rowley Green, we reseal joints in brickwork, render, cladding and façade panels. The preparation is the same whatever the wall: clean joint faces and the right depth. Common call-outs are for joints where the bead has come unstuck and joints pointed up with cement by mistake, on copings & trims, brickwork movement joints and façade panels.
Outside work in London starts with access: side passages, upper floors and where to park. In Rowley Green, joints up high may need ladders or other access, which is worth talking through when you book.
Big or small, you get the same 12-month guarantee.
- Where
- Rowley Green (EN5)
- Wider area
- Greater London
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Rowley Green questions
Is parking a problem for a job in Rowley Green?
Parking in Rowley Green, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly.
Can you do external mastic in Rowley Green?
Yes, Rowley Green is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or email us and let us know what needs doing, and we will give you a clear quote.
I rent my home. Can I book you?
We can work for tenants, landlords or agents. Just make sure your landlord agrees.
Do I need to be at home?
Access is agreed with you when the job is booked. Indoors, that usually means someone at home.
Do you work for hotels and businesses?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. Working times can be discussed when we quote.
Can I add another job to the visit?
Yes. Just list everything you need.
Is there any odour?
That depends on the sealant. Some smell for a while, some hardly at all, and any smell fades as they cure.
What sealant do you use?
Products from Arbo and Everbuild, among others, picked for each joint. We’ll tell you what we’re using and why.
When something else is needed
Before you book, it’s worth knowing the limits too:
- 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
If you’re not sure, just call 0345 464 0079 or email us and we will give you a straight answer before you book.
Surfaces we seal
- Brickwork movement joints
- Façade panels
- Copings & trims
- Concrete & block
- Joints between brick and frames
- Render & cladding joints
How to look after the new joints
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Keep movement joints as flexible joints, not mortar
- Deal with leaking gutters that soak the joints below
- Check the sealant is paintable before painting near it
- Keep high-pressure jets off the joints
Make sure anyone working on the wall later knows where the movement joints are. They should be kept open and resealed, not filled.
An open movement joint lets rain into the wall every time it pours. That can lead to damp patches, staining and frost damage.
Places near Rowley Green
More services for Rowley Green
Why act early in Rowley Green
A failed movement joint lets water into the wall, behind render and cladding. Resealing early keeps the job to the joint itself, rather than the wall around it. Converted houses in London often have a bathroom above someone else’s living room, and a slow leak from a failed seal can end up in the flat below. Putting it right early is much less trouble.
We do not show prices on the website, because each job is priced on what it involves. Call for a quick quote.
Why Rowley Green clients choose us
- Anti-fungal sanitary silicone in wet areas
- Domestic, commercial and hotel work
- You choose the colour before work begins
- Neat joints and a tidy finish
Read what affects the cost or our reviews.
What we do, step by step
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. For most jobs that takes a few hours for a handful of joints, longer for a whole elevation and we leave things clean and tidy. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- Old sealant and any debris are cut and raked out.
- The joint faces are cleaned and primed where the sealant needs it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
How to prepare
- Where the joints are inside, avoid wetting them before we arrive
- Let us know about stairs, lifts or work at height
- Tell us about any water getting in
Get a quote
There’s no standard price list, as no two jobs are quite the same. Instead, we give you a clear quote for your job. To get started, phone 0345 464 0079 or email us.
Advice
For landlords and businesses
Landlords and letting agents in Rowley Green can book us as well as householders. Resealing between tenancies keeps a property looking cared for.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll quote.
External mastic in Rowley Green: local notes
London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking. London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you look after a building such as Saffron Green Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. Rowley Green is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Rowley Green is about 1 mile east of Borehamwood, in Greater London. Wherever you are in the EN5 postcode area, our applicators can take on external mastic. Across Greater London, we cover 764 places, Rowley Green among them. We also work in London, around 13 miles away.
Every address in EN5 is within our area for external mastic. If you’re just outside Rowley Green, we cover Arkley (1 mile south-east), Well End (1 mile north-west), Borehamwood (1 mile west), Deacon's Hill (2 miles south-west) and High Barnet (2 miles east). Larger places within reach include London (13 miles south-east), City of Westminster (10 miles south), Marylebone (10 miles south-east), Kensington (11 miles south), St Pancras (10 miles south-east) and Shoreditch (11 miles south-east).
Near you in Rowley Green
Around Rowley Green, our work takes us to homes and buildings near Barnet Gate Wood and Elstree University Technical College, among other places. The closest station to Rowley Green is Elstree & Borehamwood station, about 1.4 miles west. Nearby you will also find Hilfield Castle (3.8 miles west) and Barnet General Hospital (1.4 miles east). For a walk, there’s Darland's Lake and Rowley Lodge Field.
When to call us in Rowley Green
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, and it tears off the sides.
People usually contact us after spotting something like this:
- Gaps where render, brick and frames meet
- Hard, crazed mastic that has stopped moving
- Rain getting behind render or cladding at a joint
- Leaking joints around cladding and façade panels
If you live in an older home near Holy Cross, the joints between older walls, newer extensions and the roofline need a sealant that can move.
What to look for in a quote
- Who turns up on the day
- How the colour is chosen
- How hidden problems are handled
- How long the guarantee is