Greater London · England
External Mastic in Holloway Down
We cover Holloway Down for sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly and a 12-month guarantee.
- Leaking joints around cladding and façade panels
- Sealant pulling away from one side of the joint
- Rain getting behind render or cladding at a joint
External mastic in Holloway Down, done properly
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, so once it splits or hardens, the joint stops working and water gets in. If you have weathered mastic that no longer stretches and joints where the bead has come unstuck, we can help, whatever the surface.
In London terraces and converted houses, gutters and walls are often shared with the house next door, so one failed joint can cause damp for more than one household. In a converted house in Holloway Down, it’s worth checking who is responsible for the outside before booking.
The work is guaranteed for twelve months. If something is not right with it in that time, tell us and we will put it right.
- Location
- Holloway Down (E11, E15, E7)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear price before we start
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
How the job changes by surface
Joints between dissimilar materials
Brick against render, concrete against metal, stone against timber: every change of material is a joint. We seal the joint with a flexible exterior sealant so the movement is taken up.
Copings and trims
A failed coping joint lets water into the top of the wall. Resealing them is a small job that protects a lot.
What happens if it’s left?
It often makes sense to reseal all the failing joints on an elevation together. Joints of the same age tend to fail together. In a flat in Holloway Down, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Why choose Mr Mastic in Holloway Down
- Fully insured
- Arbo and Everbuild products
- White, clear, grey or coloured to suit, where the product allows
- Sealant colour chosen to suit
See our cost guide or what customers say.
Quotes for external mastic in Holloway Down
Your quote is based on your job. We look at:
- The size of the job
- When we can work, for business premises
- Whether there’s mould to deal with
- How many areas need sealing
Every job is a little different, so we quote each one individually. Size, access and the product the joint needs all play a part, and we’ll explain the quote if you ask.
What to tell us for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- The rough size of the job
- Whether it has been sealed before
- Access, such as stairs, a lift or height
- Pictures of the joints, sent by email
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we’ll talk you through the work.
Also near Holloway Down
What else we do in Holloway Down
For landlords and businesses
Hotels need rooms back in use, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements.
How the visit works
We bring everything the job needs with us. After a quick look at the joints together, we protect the area and start. It normally takes a few hours to a few days, depending on the length of joint and the access. In a London area like Holloway Down, the main things to plan are parking and access: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Before we arrive
- Mention any tricky access
- For business premises, tell us about site rules or sign-in
- Let us know about parking restrictions
Getting a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email pictures if that’s easy.
Advice
Keeping the joints in good condition
Looking after new joints is easy:
- Don’t let climbing plants root in the sealant
- Check the sealant is paintable before painting near it
- Fix overflowing gutters above sealed joints
- Wash walls gently around the sealant
Have a quick look at the joints each spring. Splits, gaps at the edges or plants in the joint are early warning signs.
Water getting behind cladding or render can go unnoticed for a long time. When it finally shows inside, the joint may have been open for years so early resealing is worth it.
When to call us in Holloway Down
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.
These are the problems we are asked about most:
- Brick movement joints where the sealant has split
- Weathered mastic that no longer stretches
- Weeds or debris growing in open joints
- Leaking joints around cladding and façade panels
If you look after a building such as The Jenny Hammond Primary School, its movement joints, gutters and trims need looking after like any other building’s.
What to look for in a quote
- Is VAT in the price?
- Whether they’re fully insured
- Who does the work, and how experienced they are
- What product goes in the joint
FAQs for Holloway Down
Do you work for landlords with property near Maryland station?
Yes, we work for landlords and letting agents. You can ring 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before any work starts.
Can you do external mastic in Holloway Down?
Yes, Holloway Down is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or send us an email and let us know what needs doing, and we’ll send you a clear quote.
Will you leave a mess?
No. We protect the surfaces around the joints, and we clear up the old sealant and our materials before we leave.
Will the new joint stand out?
Exterior sealants are made in a range of colours, from greys and browns to whites and stone shades. We choose the closest to your brick or render so the joint does not draw the eye.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
Are you insured?
Yes, we’re fully insured for every job we do.
Will there be a smell?
Possibly a little. Any smell clears as the sealant cures, and ventilation helps.
Which products do you use?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
External mastic in Holloway Down: local notes
London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts. Historic houses like Sutton House (about 2.4 miles west) are a reminder that the area around Holloway Down has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
As a London address, Holloway Down can be tricky for parking: let us know about parking bays, permits or a driveway. Homes close to Holy Trinity & St Augustine of Hippo include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move.
Holloway Down is about 1 mile north of Stratford, in Greater London. If you need external mastic in Holloway Down, it’s easy to get a quote: please call 0345 464 0079 or send us an email. We cover Greater London from our Crawley base, Holloway Down included. 764 places in Greater London are on our list. Our London page covers work nearby (6 miles or so).
We work across the E11, E15 and E7 postcode area for external mastic and the streets around it. We cover properties on Eve Road, Cary Road and Lynn Road. We also cover East Village (1 mile south-west), Temple Mills (1 mile west), Maryland (1 mile south), Stratford (1 mile south) and Leyton (1 mile north-west). Further out, we also cover London (6 miles south-west), City of Westminster (7 miles west), Marylebone (7 miles west), Kensington (10 miles south-west), St Pancras (6 miles west) and Shoreditch (4 miles south-west).
Local landmarks in Holloway Down
Locally, jobs take us to homes and businesses close to West Ham Park, Stratford Circus and Buxton School, among other places. Holloway Down’s nearest station is Maryland station, roughly 0.6 miles south of the centre. Well-known places in the area include Tower of London (4.7 miles south-west) and Queen Mary's Hospital for the East End (0.9 miles south). The countryside around Holloway Down includes Tower Hill and Old Ford Island.