Medway · England
Fenn Street Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Fenn Street and across Medway. Fully insured, ARBOMaster approved and guaranteed for a year.
- Mastic dropping out of the joint
- Draughts and rain around sash boxes
- Open joints round the window box
Do you need sand mastic in Fenn Street?
Rain on the window surround works into any crack and pushes it out. Windows facing the weather tend to go first.
Keep an eye out for these signs:
- Gaps where the frame meets the masonry
- Old cement repairs round a window that have failed
- Mastic dropping out of the joint
- Gaps round a timber door in stone or brick
In the older streets around Church of St Mary, the joint between an old wall and a newer frame is normally the first place rain gets in.
Comparing quotes
- What guarantee comes with the work
- What preparation is included
- How much experience the applicator has
- What the cure time is
About our sand mastic in Fenn Street
If your home is listed or in a conservation area, check with your local planning authority if consent is needed before window work. Sand mastic is often favoured as a like-for-like material. We’re often asked to deal with draughts and rain around sash boxes and tired mastic found when preparing windows for paint, on timber door frames, stone surrounds and brick reveals.
Around Fenn Street, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
We stand behind the work with a 12-month guarantee, so you’re covered after we have gone.
- Where
- Fenn Street (ME3)
- Wider area
- Medway
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Questions from Fenn Street
Does living near the coast affect sand mastic in Fenn Street?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. The right product, a clean joint and the right depth all help it cope.
Do you work for landlords with property near Gillingham (Kent) station?
Yes. We work for landlords and agents as well as homeowners, and several properties can go on one quote. You can call 0345 464 0079 or send us an email with the details for a clear quote.
What exactly is sand mastic?
It’s the traditional filler for the joint round timber windows and doors. It’s made with sand and a linseed-oil-based binder.
Can you seal over the old sealant?
No, and we never do. It may look fine at first, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
How long does sand mastic take to harden?
A skin forms quite soon, but full hardening takes longer. We will tell you what to expect for your job.
Is it possible to paint over sand mastic?
Sand mastic is normally left unpainted, which is what traditional guidance recommends. Talk to us before any painting near it.
Do you remove the old sealant?
Yes, every time. New sealant will not bond properly to old, so the joint is cleaned back first.
Do you guarantee sand mastic work?
Our 12-month guarantee applies to all our work.
How the visit works
There isn’t much for you to do on the day. Show us the job and we’ll take it from there. The job generally takes anything from a few hours to a full day, depending on how many windows from start to finish. Somewhere like Fenn Street needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Getting ready for the visit
- Let us know if you’ve seen damp or leaks
- Mention any parking rules near the property
- Keep pets and children clear of the area while we work
Ask for a quote
There’s no standard price list. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or drop us an email.
Read more
Fenn Street homes and the weather
Fenn Street is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. London and the South East are among the drier parts 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 High Halstow Primary Academy, larger buildings have plenty of frames, and the mastic around each one ages. For landlords with property near Gillingham (Kent) station, any sash windows need sound mastic to keep draughts and rain out.
Fenn Street is about 5 miles north of Gillingham, in Medway. Homes, rented property, offices and hotels in Fenn Street is covered for sand mastic, old or new, large or small. The work is guaranteed for a year. Across Medway, we cover 68 places, and Fenn Street is one of them. You can also see our page for Chelmsford, about 21 miles away.
We work across ME3 for sand mastic. If you need sand mastic at a property on Winterberry Avenue, Sharnal Street and Parbrook Road or a nearby road, we can help. Neighbouring places we cover for sand mastic include Sharnal Street (1 mile south-west), High Halstow (1 mile west), Tunbridge Hill (1 mile south-east), St Mary Hoo (1 mile north-east) and Kingsnorth (1 mile south-east). Further out, we also cover Gillingham (5 miles south), Chatham (7 miles south), Rochester (5 miles south-west), Rainham (6 miles south), Strood (6 miles south-west) and Luton (6 miles south).
Near you in Fenn Street
Typical jobs here are in homes near The Hundred of Hoo Academy. The nearest railway station is Gillingham (Kent) station, about 4.4 miles south of the centre. Well-known places in the area include Medway Maritime Hospital (4.9 miles south) and Upnor Castle (3.7 miles south-west). Not far away are Bishop Saltings.
DIY versus a professional finish
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
When something else is needed
New sealant cannot fix everything, and we’ll tell you before any work starts. It will not solve:
- Crumbling stone or brickwork round the window
- Timber that has rotted
- Putty and glazing repairs
If you’re not sure, just ring 0345 464 0079 or drop us an email and we will give you a straight answer.
Joints and surfaces we work on
- Tenement windows
- Timber door frames
- Period & listed homes
- Brick reveals
- Stone surrounds
- Sash and case windows
How to look after the new joints
Aftercare is simple, and it makes a real difference:
- Ask the planning authority about consent for listed or conservation-area homes
- Leave the new mastic unpainted
- Avoid patching sand mastic with silicone
- Have rotten timber repaired before new mastic goes in
Don’t touch or press the mastic while it hardens. It forms a skin fairly soon but needs longer to fully harden.
Sound mastic protects the frame. Once it fails, water can sit against the timber, which can lead to rot.
Also near Fenn Street
More services for Fenn Street
Work for landlords, hotels and businesses
Failed sealant is one of the commonest items on a check-out report. Several properties can go on one quote.
Housing providers, facilities teams and property managers book us too in Fenn Street and across Medway. We can quote a run of properties together, and we’re fully insured for the work.
What the job involves on each surface
Stone surrounds
Old stone surrounds are often uneven, so the joint varies in width. Sand mastic is shaped by hand to suit.
Sash and case windows
The mastic round a sash window is on show, so a neat, even finish matters.