Greater London · England
Silvertown External Mastic
Professional external mastic in and around Silvertown, with old sealant always removed completely and a 12-month guarantee.
- Failed sealant between panels on a façade
- Gaps where render, brick and frames meet
- Weathered mastic that no longer stretches
Questions from Silvertown
Is parking an issue for external mastic in Silvertown?
Parking in Silvertown, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Can you do external mastic in Silvertown?
Yes, Silvertown is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or email us and tell us what needs doing.
Why is there a gap in my brick wall?
It’s a deliberate gap that lets the wall expand and contract without cracking. It should be filled with flexible sealant, never mortar.
Should I try DIY first?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
Do you remove the old sealant?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
What does external mastic cost?
It depends on the job, so we quote each one individually. To get one, phone 0345 464 0079 or drop us an email and let us know what needs doing and where.
When is the sealant fully cured?
It depends on the product. Before we leave, we’ll tell you the cure time.
Can you do several jobs on one visit?
Yes. More than one area can go on one quote.
External mastic in Silvertown, done properly
For buildings in Silvertown, we reseal external joints of all kinds, from brick movement joints to cladding panels. The preparation is the same whatever the wall: clean joint faces and the right depth. We work on joints between brick and frames, façade panels and brickwork movement joints, and the jobs we see most are plants rooting in failed movement joints and damp patches traced to an open external joint.
Newer London blocks are built with movement joints in brick and render, and with cladding joints sealed with mastic. Period houses have different weak points, such as gutter joints, trims and the line where an extension meets the old wall.
There’s a 12-month guarantee on every job.
- Place
- Silvertown (E16, SE10, SE7)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What we’re called out for in Silvertown
Sometimes a movement joint was filled with mortar or a rigid filler by mistake. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
It’s worth asking for a quote if you see:
- Weathered mastic that no longer stretches
- Movement joints filled with mortar instead of sealant
- Failed seals between different materials
- Moss and dirt in joints with no sealant left
As a London address, Silvertown can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Before you book anyone
- How long the guarantee is
- Whether VAT is included
- What happens if the job turns out different
- Whether they seal over old material or remove it
Walls and rooflines in Silvertown
London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For site and facilities teams at buildings such as Britannia Village Primary School, larger buildings have long runs of movement joint that eventually need resealing. Letting a property close to Custom House station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Silvertown is about 1 mile south of Canning Town, in Greater London. From the centre of Silvertown to the outskirts, we cover external mastic for every kind of property, from flats and houses to offices and hotels. Silvertown is one of 764 places in Greater London we cover.
We work across E16, SE10 and SE7 for external mastic. You’ll find streets such as Booth Road, Thames Road and Knights Road, and we cover them all. We also cover the places around Silvertown: West Silvertown (1 mile north-west), Custom House (1 mile north), Royal Docks (1 mile north-east), Canning Town (1 mile north) and Limmo Peninsula (1 mile north-west). Further out, we also cover London (5 miles west), City of Westminster (8 miles west), Marylebone (8 miles west), Kensington (10 miles west), St Pancras (7 miles west) and Shoreditch (5 miles west).
Landmarks near Silvertown
In Silvertown, that means homes and buildings near Anchor & Hope pub, Thames Barrier Park and The Royal Docks Community School. The closest station to Silvertown is Custom House station, about 0.7 miles north. Nearby you’ll also find Charlton Athletic Museum (1 mile south) and Gallions Reach Shopping Park (2.3 miles east). The countryside around Silvertown includes Tower Hill and Gilbert's Pit.
When something else is needed
We will always be straight with you, so here’s what new sealant will not do:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Subsidence or other structural problems
- Failed render or damaged cladding panels
If in doubt, phone 0345 464 0079 or drop us an email and we’ll say what we think before booking.
Surfaces we seal
- Façade panels
- Render & cladding joints
- Brickwork movement joints
- Copings & trims
- Joints between brick and frames
- Concrete & block
Why deal with it now?
Running new sealant over the old bead rarely lasts. New sealant does not bond well to old, weathered sealant, so we always take the old sealant out. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Putting it right early is much less trouble.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed. Ask us for a quote and we’ll go through it with you.
Why choose Mr Mastic in Silvertown
- A choice of colours where the product allows
- Approved under the ARBOMaster scheme
- Sealant colour chosen to suit
- Full insurance on every job
How we quote for external mastic
The quote reflects the job in front of us. We look at:
- The product the joint needs
- When we can work, for business premises
- How much old sealant there is and how hard it is to remove
- Whether there’s mould to deal with
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.
What to tell us for a quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- A few pictures by email, if you can
- Where the property is
- The type of property
- The problem you’ve noticed
We do not publish a price list. Instead, we give you a clear price for your job. To get started, ring 0345 464 0079 or drop us an email.
Landlords, agents and businesses in Silvertown
Failed sealant is one of the commonest items on a check-out report. Several properties can be quoted together.
For anyone letting property in or around Silvertown, jobs at different addresses can go on one quote. Send us the addresses and the work at each, and photos by email help.
Different surfaces, different methods
Cladding and façade panels
Cladding and façade panels are usually separated by sealed joints. We reseal them with a sealant suited to the panel material.
Copings and trims
Joints in copings, parapets and trims are exposed to the worst of the weather. Each is resealed with a weatherproof, flexible sealant.
Places near Silvertown
Also in Silvertown
How it works
There is not much for you to do on the day. Point us to the joints and we will get on with it. The work itself takes a few hours for a handful of joints, longer for a whole elevation from start to finish. In Silvertown, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- First we look over the joints with you, agree which to renew and talk through access.
- The old mastic and anything lodged in the joint is removed.
- The joint faces are cleaned and primed where the sealant needs it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Before we arrive
- For indoor joints, keep the area dry beforehand if you can
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us if parking is tricky
Get a quote
For external mastic in Silvertown, phone 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.