Greater London · England
External Mastic in Tyburn
Sealing brickwork movement joints, render, cladding and façade joints for Tyburn, backed by a one-year guarantee. Call for a quick quote.
- Failed seals between different materials
- Failed sealant between panels on a façade
- Weeds or debris growing in open joints
External mastic in Tyburn
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. We pick a colour that sits well with the wall so the line blends in. We work on brickwork movement joints, concrete & block and joints between brick and frames, and the jobs we see most are damp patches traced to an open external joint and joints with sealant missing in places.
Outside work in London starts with access: side passages, upper floors and where to park. In Tyburn, joints up high may need ladders or other access, which is worth talking through when you book.
Each job carries a 12-month guarantee, whatever its size.
- Location
- Tyburn (W1H, W1U, W1K)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Landlords, agents and businesses in Tyburn
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can go on one quote.
DIY versus a professional finish
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
How it works
We bring everything the job needs with us. Once we’ve agreed what’s being done, we protect the area and start. Most jobs take anything from a few hours to several days, depending on the building. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
How to prepare
- Tell us about any water getting in
- For indoor joints, keep the area dry beforehand if you can
- Mention any tricky access
How to get a quote
Call for a quick quote, or email us if that’s easier. Describe what needs sealing and we will talk you through the work before giving you a price.
Advice
What affects the cost of external mastic
The price is agreed before any work begins. It takes into account:
- The old material and how stubborn it is
- How many areas need sealing
- How easy the joints are to reach
- The product the joint needs
What you pay reflects the work, not a rough estimate. That is why we ask a few questions first and agree the price before starting.
Asking for a quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- The type of property
- The address or postcode of the job
- If someone has resealed it before
- The problem you’ve noticed
Need a quote? Please call 0345 464 0079 or drop us an email with a few details. We will explain what we’d do and give you a clear quote before any work starts.
Looking after it afterwards
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Avoid pressure-washing directly into sealant joints
- Look over the joints every year, ideally after winter
- Keep soil, plants and ivy away from the joints
- Never let anyone fill a movement joint with mortar
Have a quick look at the joints each spring. Splits, gaps at the edges or plants in the joint are early warning signs.
Leaks behind façade panels and render often go unseen. When it finally shows inside, the joint may have been open for years.
Common problems we fix in Tyburn
Weeds, moss and debris in a joint are a sign the sealant has gone. Dirt and roots then trap moisture in the joint and speed up the damage.
Common reasons people contact us include:
- Failed seals between different materials
- Weeds or debris growing in open joints
- Weathered mastic that no longer stretches
- Movement joints with cracked, split or missing sealant
As a London address, Tyburn can be tricky for parking: let us know about parking bays, permits or a driveway.
Questions to ask before you book
- What the cure time is
- Whether they seal over old material or remove it
- Whether you can choose the colour
- How the surfaces are prepared before sealing
Nearby places to Tyburn
What else we do in Tyburn
Walls and rooflines in Tyburn
Historic houses like Handel Hendrix House (about 0.8 miles east) are a reminder that the area around Tyburn has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking.
Schools such as Hampden Gurney CofE Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing. In the older streets around Church of the Annunciation, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Tyburn is about 1 mile west of City of Westminster, in Greater London. From the centre of Tyburn to the outskirts, we cover external mastic for every kind of property. Our area takes in 764 places across Greater London, large and small.
Postcode districts we cover here for external mastic: W1H, W1U and W1K. If you need external mastic at a property on Sussex Square, Oxford Square and Bayswater Road or a nearby road, our applicators can take on the job. Tyburn sits on or near the A4209, which makes travel easy. Other places close to Tyburn include Connaught Village (1 mile north-west), Hyde Park Estate (1 mile north-west), Paddington (1 mile north-west), City of Westminster (1 mile east) and Paddington Green (1 mile north-west). Further out, we also cover London (3 miles east), Shoreditch (4 miles east), Walthamstow (8 miles north-east), Hoxton (4 miles north-east), Whitechapel (4 miles east) and Hampstead (3 miles north).
Local landmarks in Tyburn
Around Tyburn, our work takes us to homes and buildings near Ark King Solomon Academy, Royal Society of Medicine Library and Duke Of Kendal pub and the streets around them. Other local landmarks include International Community School (less than half a mile north-west) and Hyde Park (under half a mile south). For rail, the closest station is London Paddington station, roughly 0.6 miles north-west. A little further out are Dunhill Museum & Archive (0.6 miles north-east) and Harrods (0.9 miles south). Green spaces nearby include Greville Place nature reserve and Campden Hill.
What the job involves on each surface
Concrete and blockwork
Wide joints in concrete need the depth controlling carefully. Backing rod sized to the joint sets it and keep the sealant to the right depth.
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. The old joint is removed and a sealant that bonds to both sides goes in.
FAQs for Tyburn
Do you cover Tyburn for external mastic?
Yes. We work across London and the South East, and Tyburn is part of that. You can call 0345 464 0079 or drop us an email and let us know what needs doing, and we’ll give you a clear price.
Is parking an issue for external mastic in Tyburn?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Will you leave a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
Can I do it myself?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. Our applicators cover Tyburn.
Should I point up the gap in my brickwork?
No. Cement or mortar can’t stretch and the joint fails. Where a joint has been mortared, it can often be raked out and sealed properly.
Can I add another job to the visit?
Of course. Doing several areas at once is generally more efficient.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.