Greater London · England
Sand Mastic in Silvertown
Professional sand mastic in and around Silvertown, with old sealant always removed completely and a 12-month guarantee.
- A silicone bead on a sash window that spoils the look
- Draughts and rain around sash boxes
- Open joints round the window box
The process
Once we are on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. After that, the work takes anything from a few hours to a full day, depending on how many windows. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Silvertown. A visitor permit or a nearby bay makes the visit run more smoothly.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Getting ready for the visit
- Let us know about parking restrictions
- Keep pets and children clear of the area while we work
- Where the joints are inside, avoid wetting them before we arrive
Getting a quote
Every job is quoted individually, so start by telling us what you need. Just ring 0345 464 0079 or drop us an email with the details.
Advice
How we handle sand mastic in Silvertown
Old sand mastic cracks, crumbles and falls out over time, leaving gaps round the window. We rake it out and renew it so the surround looks right again. We work on timber door frames, period & listed homes and tenement windows, and people most often call us about old cement repairs round a window that have failed and mastic dropping out of the joint.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. The mastic around them dries out and cracks with age, letting in draughts and water.
We stand behind the work with a one-year guarantee.
- Place
- Silvertown (E16, SE10, SE7)
- Region
- Greater London
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Work for landlords, hotels and businesses
In hotels, rooms out of use cost money, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we will quote.
Can I do it myself?
If you’ve already had a go yourself, that is fine. We cut it out and start again, so just mention it when you contact us.
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
Also near Silvertown
What else we do in Silvertown
Different surfaces, different methods
Tenement and terrace windows
Where a building is shared, window work may involve neighbours, so check who is responsible first.
Timber door frames
Sand mastic is used round timber door frames too. We renew it the same way as on windows.
What we can’t put right
Before you book, it’s worth knowing the limits:
- Broken panes
- Sashes that need overhauling
- Whether work needs listed building consent
If you’re not sure, just phone 0345 464 0079 or send us an email and we will give you a straight answer.
Where we work in Silvertown
- Brick reveals
- Timber door frames
- Stone surrounds
- Period & listed homes
- Sash and case windows
- Tenement windows
Aftercare tips
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Keep modern sealant off the mastic
- Make sure water runs off the sill
- Ask a joiner to look at soft timber first
- Inspect the joints round the windows every year or so
Avoid painting over the new mastic, as traditional guidance advises. Ask us before any decorating around it.
An open joint round the box lets weather through. The longer it’s left, the more the joint opens.
What happens if it’s left?
Before painting the windows, it pays to renew the mastic. Paint over cracked mastic won’t stop the gaps, and the new mastic is traditionally left unpainted. In London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Putting it right early is much less trouble.
No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part, and we’ll explain the quote if you ask.
Why choose Mr Mastic in Silvertown
- Neat joints and a tidy finish
- Arbo and Everbuild products
- Sanitary silicone with an anti-fungal additive in wet areas
- We never seal over old sealant
Read what affects the cost and what customers say.
Your questions about sand mastic in Silvertown
I let a flat near Custom House station. Can you help?
Yes. We work for letting agents and landlords as well as homeowners. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear price.
Can you do sand mastic in Silvertown?
Yes. Our work covers London and the South East, and Silvertown is part of that. Just ring 0345 464 0079 or email us with a few details of the job, and we will give you a clear quote.
Are you fully insured?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
Is it OK to seal over old sealant?
No, it will not last. It can look neat for a few weeks, but the new layer lifts away from the old one. The old sealant has to come out completely.
Can sand mastic be painted?
It’s traditionally left unpainted, which is what traditional guidance recommends. Talk to us before any painting near it.
Do you do commercial work?
Yes. Commercial and hotel work is a large part of what we do. Working times can be discussed when we quote.
What is sand mastic?
It’s sand mixed with a linseed-oil-based binder for the joint between timber frames and masonry.
What sealant do you use?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Windows and doors in Silvertown
In London conversions and blocks, the lease decides who is responsible for the frames, so check that before booking. Historic houses like Queen's House (about 1.9 miles south-west) are a reminder that the area around Silvertown has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
For landlords with property near Custom House station, any sash windows need sound mastic to keep draughts and rain out. In the older streets around St Barnabas' Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. For site and facilities teams at buildings such as Britannia Village Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Silvertown is about 1 mile south of Canning Town, in Greater London. Across the E16 area, our applicators can take on sand mastic. Silvertown is one of 764 towns and villages in Greater London we cover.
Here we cover the E16, SE10 and SE7 postcode area for sand mastic. Whether your property is on Booth Road, Thames Road and Knights Road or a nearby road, our applicators can take on the job. Other places close to Silvertown include 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). We also work in nearby towns such as 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).
Local landmarks in Silvertown
In Silvertown, that means homes and buildings near Anchor & Hope pub, Thames Barrier Park and The Royal Docks Community School and the streets around them. For rail, the closest station is Custom House station, roughly 0.7 miles north of the centre. A little further out are Charlton Athletic Museum (1 mile south) and Gallions Reach Shopping Park (2.3 miles east). Open spaces near Silvertown include Tower Hill and Gilbert's Pit.