Greater London · England
Monkhams External Mastic
External mastic for Monkhams and the surrounding area: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Damp patches traced to an open external joint
- Sealant pulling away from one side of the joint
- Cracked joints where brick meets render or frames
External mastic in Monkhams, done properly
We’re ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Some surfaces need a primer before sealing. Common call-outs are for sealant pulling away from one side of the joint and panel joints letting water in, on concrete & block, façade panels and render & cladding joints.
Modern London flats rely on sealed movement joints and cladding joints. Older terraces have their own weak points: gutter joints, roofline trims and the joint where an extension meets the original wall.
Big or small, you get the same 12-month guarantee.
- Location
- Monkhams (IG8, IG9, E4)
- Region
- Greater London
- Guarantee
- One year on every job
- Quote
- A clear price before work begins
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
When to call us in Monkhams
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, so it pulls away from the edges.
Most people get in touch after spotting one of these:
- Old sealant gone brittle and cracked
- Failed seals between different materials
- Brick movement joints where the sealant has split
- Plants rooting in failed movement joints
Schools such as Wells Primary School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s.
Questions to ask before you book
- What the cure time is
- The length of the guarantee
- Whether all the old sealant comes out first
- What happens if the job turns out different
What external mastic looks like in Monkhams
In terraces and conversions, gutters and walls are often shared with the neighbours, so it’s worth agreeing who is responsible before work starts. 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.
If you let a flat or house near Highams Park station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. Monkhams is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Monkhams is about 1 mile north of Woodford, in Greater London. Our applicators cover external mastic for householders, landlords and businesses in Monkhams. Our Greater London coverage runs to 764 places, Monkhams among them. There’s also a page for London, about 10 miles away.
All of IG8, IG9 and E4 is covered for external mastic. If you need external mastic at a property on Oak Lane, Wood Lane and Mill Lane or a nearby road, we can help. Monkhams is on the A121, so it’s easy for us to get to with everything needed for external mastic. We also cover Woodford Wells (1 mile east), Friday Hill (1 mile west), Woodford (1 mile south), Buckhurst Hill (1 mile north-east) and Chingford Hatch (1 mile west). We also work in nearby towns such as London (10 miles south-west), City of Westminster (10 miles south-west), Marylebone (10 miles south-west), Kensington (13 miles south-west), St Pancras (9 miles south-west) and Shoreditch (8 miles south-west).
Landmarks near Monkhams
In Monkhams, that means homes and buildings near Woodford Green Preparatory School, The Highams Park and Trinity Catholic High School and the streets around them. The closest station to Monkhams is Highams Park station, roughly 1.2 miles south-west of the centre. Well-known places in the area include The Epping Forest Museum (1.3 miles north) and Claybury Hospital (2.1 miles south-east). For a walk, there’s Highams Park Lake and Pole Hill.
What affects the cost of external mastic
There’s no set price list, because jobs vary so much. The quote depends on:
- Which sealant suits the joint
- Any mould that needs treating
- How many rooms, windows or areas are involved
- How much old sealant there is and how hard it is to remove
We don’t show prices on the website, because the cost depends so much on the job itself. For a quick quote, please call 0345 464 0079 or drop us an email.
Asking for a quote
Before you ask for a quote, have a think about:
- The rough size of the job
- How we’d reach the joints
- Whether it has been sealed before
- Where the property is
Need a quote? Please ring 0345 464 0079 or drop us an email and tell us about the job. We’ll explain what we’d do and give you a clear quote before work begins.
Your questions about external mastic in Monkhams
Can parking be tricky for a visit in Monkhams?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
I let a flat near Highams Park station. Can you help?
Yes, landlords and agents are among the people we work for. Just call 0345 464 0079 or email us with the address and what needs doing, and we’ll send you a clear quote.
How long does external mastic last?
That varies with the weather the wall faces, how much it moves and the sealant used. Treat it as a maintenance item and look at it yearly.
Are you fully insured?
Yes. We are fully insured.
Can you reach joints on upper floors?
That depends on the building and the joints. We work on joints that can be reached safely. Tell us about the building and we will confirm what access is needed.
Will there be a smell?
It depends on the product. Some products have a noticeable smell, others very little, and any smell fades as they cure.
What’s an expansion joint in brickwork?
Walls move with heat, cold and moisture, and planned joints take up that movement. It’s closed with backing rod and a flexible sealant.
How long should I leave it?
Cure times vary by product. We tell you how long to leave it before we go.
Towns and villages near Monkhams
Also in Monkhams
What we do, step by step
The work is kept neat and contained to the joints we’re treating. Expect the work to take a few hours to a few days, depending on the length of joint and the access, and we explain the cure time before we leave. For a job in Monkhams, parking and access are the things to plan: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
Before we arrive
- Mention if the joints have been sealed before
- Tell us about any water getting in
- Tell us about access, such as stairs, a lift or high-level joints
How to get a quote
Every job is quoted individually, so the first step is telling us about yours. Simply phone 0345 464 0079 or drop us an email and describe the job, and pictures are welcome.
Advice
How to look after the new joints
A little care helps the new joints last. Our advice:
- Wash walls gently around the sealant
- Never let anyone fill a movement joint with mortar
- Fix overflowing gutters above sealed joints
- Clear growth from the base of walls and joints
Make sure anyone working on the wall later knows where the movement joints are. They should be kept open and resealed, not filled.
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.
DIY versus a professional finish
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Leave it or put it right?
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That matters on brick, render and concrete, which can be weaker at the face. A stiffer product can damage the joint edge as it fails. In a flat in Monkhams, failed sealant seldom stays inside your own four walls: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
Doing several joints on one visit usually makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. You will get one clear quote for the whole job.
Why choose Mr Mastic in Monkhams
- A sealant colour to suit the surroundings
- A 12-month guarantee on all work
- Homes, businesses and hotels
- A choice of colours where the product allows
What sealant work cannot fix
It helps to know what we cannot do:
- Damp that isn’t coming from the joint
- Failed render or damaged cladding panels
- Subsidence or other structural problems
Not sure which it is? You can phone 0345 464 0079 or send us an email and we will tell you honestly.
What we seal
- Copings & trims
- Render & cladding joints
- Brickwork movement joints
- Façade panels
- Concrete & block
- Joints between brick and frames