Greater London · England
Moor Park External Mastic
Sealing brickwork movement joints, render, cladding and façade joints in Moor Park, with a one-year guarantee on every job. Ask us for a quote.
- Rain getting behind render or cladding at a joint
- Movement joints with cracked, split or missing sealant
- Failed sealant between panels on a façade
What happens on the day
All our tools and materials come with us in the van, so you do not need to buy or prepare anything. After a quick look at the joints together, we protect the area and start. It normally takes a few hours for a handful of joints, longer for a whole elevation. In Moor Park, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- The old mastic and anything lodged in the joint is removed.
- Both sides are cleaned back to sound material and primed if needed.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Preparing for the visit
- Move anything stored near the joints
- Keep pets and children clear of the area while we work
- For business premises, tell us about site rules or sign-in
How to get a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is.
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External mastic in Moor Park, done properly
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible exterior sealant takes up that movement where a rigid filler would soon crack. We work on concrete & block, joints between brick and frames and render & cladding joints, and people most often call us about old sealant gone brittle and cracked and joints where the bead has come unstuck.
London’s terraces and conversions often share walls, gutters and downpipes with their neighbours, so one failed joint can cause damp for more than one household. For a flat in Moor Park, check the lease for who looks after the outside.
The work is covered for a year after we finish. If there’s a problem with it, please call 0345 464 0079 or send us an email.
- Place
- Moor Park (HA6, WD3)
- Region
- Greater London
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Questions from Moor Park
Do you cover Moor Park for external mastic?
Yes. Our work covers London and the South East, and Moor Park is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job.
I let a flat near Rickmansworth station. Can you help?
Yes. We work for landlords and letting agents as well as householders. You can phone 0345 464 0079 or send us an email with the details for a clear quote.
Can I add another job to the visit?
Of course. Doing several areas at once is usually more efficient.
Do you work for hotels and businesses?
Yes. Hotels, offices and other businesses use us.
Is there a guarantee?
Yes, always. There’s a 12-month guarantee on every job, wherever you are.
Is it worth trying it myself?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. If it does not work out, we can redo it.
What do you need from me for a quote?
Only a few details: the address or postcode, what’s wrong and any access issues. After that, simply ring 0345 464 0079 or drop us an email.
Do you take out the old sealant first?
Yes, always, and completely. New silicone doesn’t stick to old silicone, so any old material comes out before anything new goes in.
Keeping the joints in good condition
Simple care keeps the joints in good condition. We recommend:
- Keep high-pressure jets off the joints
- Make sure movement joints aren’t pointed over
- Leave the joints unpainted unless we have said otherwise
- Look over the joints every year, ideally after winter
Have a quick look at the joints each spring. Splits, gaps at the edges or plants in the joint are early warning signs.
If you can see gaps, plants or bare sections in a joint, have it checked. Early work is quicker and leaves a better finish.
What external mastic looks like in Moor Park
In terraces and conversions, gutters and walls are often shared with the neighbours, so check who is responsible for the outside before booking. 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.
Moor Park is in London, so parking needs planning: let us know about parking bays, permits or a driveway. For site and facilities teams at buildings such as St Martins School Northwood, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Moor Park is about 2 miles south-east of Rickmansworth, in Greater London. Whether you’re in the middle of Moor Park or further out, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Moor Park is one of 764 towns and villages in Greater London where we work for external mastic. We also work in London, about 17 miles from Moor Park.
All of HA6 and WD3 is covered for external mastic. If you need external mastic at a property on Bedford Road, Ormonde Road and Russell Road or anywhere close by, our applicators can take on the job. Close by, we work in Batchworth Heath (1 mile west), Northwood (1 mile south-east), Eastbury (1 mile east), Batchworth (1 mile west) and Woodcock Hill (2 miles west). Larger places within reach include City of Westminster (14 miles south-east), Marylebone (14 miles south-east), Kensington (13 miles south-east), St Pancras (15 miles south-east), Hampstead (12 miles south-east) and Ruislip (3 miles south).
Landmarks near Moor Park
We work in homes and buildings around Eastbury Farm Primary School, Rickmansworth School and King George V Playing Fields. Moor Park’s nearest station is Rickmansworth station, about 2.1 miles north-west of the centre. Well-known places in the area include Mount Vernon Hospital (0.7 miles south-west) and Hilfield Castle (4.7 miles north-east). For a walk, there’s Dews Farm Sand Pits and Tumbling Bay.
What affects the cost of external mastic
Call for a quick quote. The main things that affect it are:
- How easy the joints are to reach
- Which sealant suits the joint
- When we can work, for business premises
- The old material and how stubborn it is
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all make a difference, and we will explain the quote if you ask.
Helping us quote
When you call or email, it’s useful to know:
- Roughly how big the job is
- Any access issues, like height or stairs
- A few photos by email, if you can
- What the problem is, such as mould, gaps, leaks or cracking
For external mastic in Moor Park, call 0345 464 0079 or email us. Tell us what the problem is and where, and we will agree the price before any work begins.
What we’re called out for in Moor Park
Every building moves. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. The sealant in the movement joints takes that strain.
Keep an eye out for these signs:
- Cracked joints where brick meets render or frames
- Joints where the bead has come unstuck
- Brick movement joints where the sealant has split
- Hard, crazed mastic that has stopped moving
For an older house near a landmark such as Holy Trinity Church, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Comparing quotes
- How long to leave it before use
- What happens if the job turns out different
- Who does the work, and how experienced they are
- How long the guarantee is
Leave it or put it right?
Resealing a run of joints in one go is usually better than patching one at a time. They’ve weathered the same way and it means sorting access once. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Moor Park, the repair is bigger than a sealant job.
Doing several joints on one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. We’ll give you a clear price for the lot.
Why Moor Park clients choose us
- Quality sealants from Arbo and Everbuild
- 180+ five-star Google reviews
- Tidy, careful work
- Colour agreed with you before work begins
See our cost guide and customer reviews.
Surface by surface
Concrete and blockwork
Big joints in concrete need careful depth control. We size the backing rod to the gap so the sealant is not too deep.
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.
When it isn’t the sealant
We will always be straight with you, so here’s what sealant can’t fix:
- Adding movement joints to masonry that has none
- Movement that’s more than a sealant joint can take
- Loose or hollow render, which needs re-rendering
If in doubt, ring 0345 464 0079 or email us and we’ll say what we think before booking.
What we seal
- Copings & trims
- Joints between brick and frames
- Brickwork movement joints
- Concrete & block
- Render & cladding joints
- Façade panels