Kent · England
Dunkirk Sand Mastic
Sand mastic across Dunkirk and nearby, with old sealant always removed completely and a 12-month guarantee.
- Gaps between timber frames and stone or brick
- Mastic round period door frames that has failed
- Draughts and rain around sash boxes
Sand mastic for homes and businesses in Dunkirk
Across Dunkirk, we renew sand mastic around sash and case windows. Each joint is raked out, prepared and pointed by hand, finished to suit the masonry. Common call-outs are for modern sealant on a period surround and weathered mastic on the most exposed windows, on sash and case windows, stone surrounds and tenement windows.
Somewhere as small as Dunkirk, older homes often have timber frames set in stone or brickwork. Older buildings like these do not always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
Each job carries a 12-month guarantee, large or small.
- Place
- Dunkirk (ME13)
- Wider area
- Kent
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Should I try it myself first?
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
Sand mastic in Dunkirk: local notes
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Rented homes near Selling station change hands often, and any sash windows need sound mastic to keep draughts and rain out.
Dunkirk is about 4 miles south-east of Faversham, in Kent. Every kind of property in Dunkirk can book us for sand mastic, old or new, large or small. The work is guaranteed for a year. Our Kent coverage runs to 922 places, and Dunkirk is one of them. We also work in Chelmsford, around 37 miles away.
Jobs for sand mastic in ME13 works the same way as everywhere else we cover. That includes homes and businesses on London Road and Courtenay Road and the roads around them. We also cover the places around Dunkirk: Boughton under Blean (1 mile west), Winterbourne (1 mile south-west), Hickmans Green (1 mile west), Oversland (1 mile south-west) and South Street (2 miles south-west). Further out, we also cover Ashford (12 miles south-west), Canterbury (5 miles east), Sittingbourne (11 miles west), Whitstable (5 miles north-east), Faversham (4 miles north-west) and Herne Bay (9 miles north-east).
Landmarks near Dunkirk
Around Dunkirk, our work takes us to homes and buildings near The Red Lion pub and Mount Ephraim Gardens. The nearest railway station is Selling station, about 1.9 miles south-west. Nearby you will also find Chilham Castle (3.5 miles south) and Eastbridge Hospital of St Thomas the Martyr (4.4 miles east). Not far away are Blean Woods RSPB Reserve.
Different surfaces, different methods
Tenement and terrace windows
Windows above ground floor need the right access. Let us know the floor and we’ll confirm access.
Stone surrounds
Stone openings are rarely perfectly straight, so the gap is not the same all the way round. Sand mastic is shaped by hand to suit.
How the visit works
There’s no need to move everything out, only the area right around the joints. We protect the rest, and the job takes a few hours per window, depending on the condition of the joints for a typical job. Somewhere like Dunkirk 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 start by checking each surround and agreeing the joints to renew.
- Old, loose mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic is not too thick.
- The mastic is mixed, pressed into the joint by hand and shaped.
- We dress the surface so it sits neatly against the masonry.
Before we arrive
- For indoor joints, keep the area dry beforehand if you can
- Clear the area around the work
- Tell us about any previous sealing or DIY attempts
Get a quote
For sand mastic in Dunkirk, call 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
Read more
For landlords and businesses
Letting agents and landlords in Dunkirk can book us as well as householders. Resealing between tenancies is a simple way to keep a property in good order.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
How to look after the new joints
To keep the joints looking good and working properly:
- Inspect the joints round the windows every year or so
- Leave the new mastic unpainted
- Do not run silicone over sand mastic
- Go gently near the mastic when preparing windows
Keep gutters and sills clear so water runs away from the surround. Constant wetting wears the mastic faster.
Small cracks are a sign the mastic is ageing. Renewing it then is simpler than waiting until it falls out.
FAQs for Dunkirk
Do you work for landlords with property near Selling station?
Yes, we work for landlords and letting agents. Just phone 0345 464 0079 or email us and tell us about the property, and we will give you a clear quote.
Is Dunkirk in your area for sand mastic?
Yes, Dunkirk is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or email us and tell us what needs doing.
Can old silicone round a sash window be swapped for sand mastic?
Often, yes. Once the silicone is out and the joint prepared we point it with sand mastic.
How much does sand mastic cost in Dunkirk?
Size, access and the old material all affect the cost. Ask us for a quote.
Is the work guaranteed?
All our work has a 12-month guarantee.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator and we’re fully insured too.
Where is Mr Mastic based?
We’re a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
Can I choose the sealant colour?
Most of the time, yes. We will explain which colours are available and agree one before any work starts.
Quotes for sand mastic in Dunkirk
We quote each job individually. This is what makes a difference:
- Mould in or behind the old joints
- Any working-time requirements on site
- How much there is to do
- Whether old sealant or filler has to be cut out
Rather than a set price list, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Helping us quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- A few photos by email, if you can
- Access, such as stairs, a lift or height
- The address or postcode of the job
- How many joints, rooms or windows are involved
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 is easy.
Signs you need sand mastic in Dunkirk
Paint, silicone or cement used over old mastic causes problems. They do not move with the timber and we normally remove them.
Any of these means the joints need attention:
- Cracked mastic round a front door frame
- Tired mastic found when preparing windows for paint
- Gaps between timber frames and stone or brick
- Draughts and rain around sash boxes
Homes close to Christ Church include some older properties, and the joint between an old wall and a newer frame is normally the first place rain gets in.
Questions to ask before you book
- What product goes in the joint
- Whether they’re fully insured
- What happens if they find a problem under the old sealant
- Whether all the old sealant comes out first