Kent · England
Sand mastic for sash & case windows in Ash, Kent
Professional sand mastic in and around Ash, with every bit of old sealant taken out first.
- Gaps where the frame meets the masonry
- Window mastic to renew ahead of painting
- Failed mastic on an exposed elevation
Do you need sand mastic in Ash?
Over the years, sand mastic weathers. It dries out, cracks and loses its grip from the frame or the masonry.
The problems people usually mention when they call are:
- Window mastic to renew ahead of painting
- Patchy fillers round a sash window
- Draughts and rain around sash boxes
- Mastic round period door frames that has failed
Managing a site like New Ash Green Primary School? Then its window and door frames need their mastic kept sound, just like a home’s.
What to look for in a quote
- Whether you can choose the colour
- What happens if the job turns out different
- How much experience the applicator has
- Are they insured?
Sand mastic for homes and businesses in Ash
Sand mastic skins over fairly quickly but full hardening takes longer. Traditionally, sand mastic is left unpainted and we’ll advise if you’re redecorating. If you’re dealing with cracked mastic round a front door frame and window mastic to renew ahead of painting, we can help, on sash and case windows, period & listed homes and timber door frames alike.
Homes in small places like Ash often stand in the open, with little to shelter their windows from wind and rain. Exposed frames and sills lose their mastic sooner than sheltered ones.
We stand behind the work with a 12-month guarantee.
- Location
- Ash (TN15, DA3)
- Region
- Kent
- Guarantee
- A year, on every job
- Quote
- A clear price before we start
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Common questions in Ash
Will you come out to Ash?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Do you work for landlords with property near Longfield station?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before any work starts.
What exactly is sand mastic?
It’s a mix of sand and a linseed-oil-based binder. It’s applied by hand and finished to sit neatly against the masonry.
Should I use sand mastic or silicone?
That depends on your windows. On many period windows, sand mastic looks right and suits the building and newer frames generally get a flexible sealant.
How long does sand mastic take to go off?
Not right away. It skins first and hardens fully later and we’ll give you an idea for your job.
What should I tell you?
The location, the problem and the rough size of the job. Photos by email help too.
Is it OK to seal over old sealant?
No, it won’t 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.
Is it possible to paint over sand mastic?
It’s traditionally left unpainted, which is what traditional guidance recommends. Ask us before decorating.
Ash homes and the weather
With historic houses such as Lullingstone Castle (about 4.2 miles west) nearby, there’s older building stock in the area around Ash as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. 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.
If you live in an older home near Parish Church of Saint Peter and Saint Paul, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Rented homes near Longfield station change hands often, and any sash windows need sound mastic to keep draughts and rain out.
Ash is about 6 miles south-west of Northfleet, in Kent. Every kind of property in Ash is covered for sand mastic, old or new, large or small. The work is guaranteed for a year. Ash is one of 922 places in Kent where we work for sand mastic. There’s also a page for London, roughly 19 miles from Ash.
We work across the TN15 and DA3 postcode area for sand mastic and the streets around it. You will find streets such as Ash Road, The Street and Billet Hill, and we cover them all. If you’re just outside Ash, we cover West Yoke (1 mile north), Fawkham Green (1 mile north-west), Speed Gate (1 mile north-west), Stansted (2 miles south) and West Kingsdown (2 miles south-west). We also work in nearby towns such as Maidstone (12 miles south-east), Dartford (7 miles north-west), Sevenoaks (7 miles south-west), Royal Tunbridge Wells (15 miles south), Gravesend (6 miles north-east) and Tonbridge (11 miles south).
Around Ash
In Ash, that means homes and buildings near The White Swan Public House and the streets around them. Ash’s nearest station is Longfield station, roughly 2.8 miles north of the centre. Nearby you will also find Darent Valley Hospital (5.6 miles north) and Eynsford Castle (3.6 miles west).
More services for Ash
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. A few tips:
- Do not run silicone over sand mastic
- Ask a joiner to look at soft timber first
- Ask us before painting near the mastic
- Make sure water runs off the sill
Make sure water drains away from the window surround. Constant wetting wears the mastic faster.
Once mastic starts to crumble, rain gets in. That water can reach the timber frame and the wall so early renewal protects both.
The process
Most of a good job is in the preparation, so that is where we spend the time. Every joint is cleaned and dried before new material goes in. All told, the work takes anything from a few hours to a full day, depending on how many windows. For a village or hamlet like Ash, the journey is planned in advance: 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.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
How to prepare
- Let us know about earlier repairs to the joints
- Clear items away from the joints we’re working on
- Mention any sign-in or site rules at work premises
Get a quote
We quote each job on its own, so the first step is telling us about yours. Just call 0345 464 0079 or email us with the details and send photos if you have them.
Related advice
Why it’s worth doing now in Ash
New mastic over crumbling mastic won’t hold. We remove the loose material first so the new work lasts. Where a wall is exposed, as many are in small places like Ash, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote and we will talk you through it.
Why us?
- ARBOMaster approved applicator
- Trusted Arbo and Everbuild sealants
- Homes, businesses and hotels
- Fully insured
Take a look at our cost guide and what customers say.
What affects the quote in Ash
Jobs vary more than people expect. What affects the quote:
- The type of sealant required
- The number of rooms or windows
- The old material and how stubborn it is
- The amount of work
Leaving a failed joint generally makes the job bigger, not smaller, as water and mould keep getting in. If you are not sure whether it needs doing, call 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
Helping us quote
What to tell us when you ask for a quote:
- The address or postcode of the job
- How many joints, rooms or windows are involved
- Whether it’s a home or a business
- How we’d reach the joints
If you’re in Ash and need sand mastic, phone 0345 464 0079 or email us. Tell us what the problem is and where, and you’ll get a clear quote before any work starts.
How the job changes by surface
Period and listed homes
A traditional finish suits a period property.
Timber door frames
Period doors in stone or brick openings are often pointed with sand mastic. We renew it the same way as on windows.
When something else is needed
In fairness, some problems need a different trade:
- Sash cords, weights and draught-proofing of the sashes
- Damaged stone surrounds
- Decisions on consent for listed homes
If in doubt, call 0345 464 0079 or drop us an email and we will say what we think before you book.
What we seal
- Timber door frames
- Period & listed homes
- Stone surrounds
- Brick reveals
- Tenement windows
- Sash and case windows