Kent · England
Sand mastic for sash & case windows in Culmers, Kent
Sand mastic for Culmers, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Cement or filler used on old window joints that has cracked
- Weathered mastic on the most exposed windows
- Gaps where the frame meets the masonry
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
How we handle sand mastic in Culmers
For a listed home or one in a conservation area, ask your local planning authority if consent is needed before window work. Like-for-like sand mastic is often the preferred finish. We work on stone surrounds, tenement windows and period & listed homes, and the jobs we see most are open joints round the window box and old sand mastic that has cracked, crumbled or fallen out.
In a village or hamlet like Culmers, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these don’t always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
Our work is backed for twelve months.
- Location
- Culmers (ME13)
- Region
- Kent
- Cover
- One year on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What happens if it’s left?
Replacing sash windows is a big decision for a period home, and in listed buildings it may need consent. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. In a small place like Culmers, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, along with when we can work on site. Ask us for a quote and we’ll go through it with you.
Why Culmers clients choose us
- Trusted Arbo and Everbuild sealants
- Domestic, commercial and hotel work
- 4.9 on Google from 180+ five-star reviews
- Sanitary silicone with an anti-fungal additive in wet areas
Culmers: your questions answered
Does the coastal weather in Culmers affect outside sealant?
Near the sea, outside joints face more wind, rain and salt than they would inland, so preparation and the right sealant matter all the more. Walls facing the sea are generally the first to need attention.
Do you cover smaller places like Culmers?
Yes, Culmers is covered. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
How long does the job take?
It depends on the size of the job, but as a guide it takes a few hours for a single window, longer for several. We’ll give you a better idea when we quote.
Do you take out the old sealant first?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
What do you need from me for a quote?
Just the basics: the address or postcode, what’s wrong and any access issues. After that, simply call 0345 464 0079 or drop us an email.
Is sand mastic better than silicone for my windows?
That depends on your windows. On many period windows, sand mastic looks right and suits the building, while modern frames normally get a flexible sealant.
Can I choose the sealant colour?
Usually, yes. Sealants come in white, clear, grey and other colours, and we will agree it with you first.
What do you put in the joint?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
Surface by surface
Timber door frames
Round a period front door, sand mastic gives the right look.
Brick reveals
Gaps between frame and brick let in rain and draughts. Renewing the mastic closes it.
Aftercare tips
So the new joints stay in good condition:
- Inspect the joints round the windows every year or so
- Go gently near the mastic when preparing windows
- Clear gutters so water doesn’t pour onto the windows
- Avoid patching sand mastic with silicone
Don’t touch or press the mastic while it hardens. It skins over quickly, but takes longer to harden fully.
An open joint round the box lets weather through. The longer it’s left, the more the joint opens.
Nearby places to Culmers
More services for Culmers
What happens on the day
We work through the job in order: protection first, then preparation, sealing and a tidy-up. Typically it takes anything from a few hours to a full day, depending on how many windows and we leave things clean and tidy. Somewhere as small as Culmers, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check the window surrounds and agree which joints need renewing.
- Old, loose mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- We dress the surface so it sits neatly against the masonry.
How to prepare
- For business premises, tell us about site rules or sign-in
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us about any water getting in
Get a quote
To get a quote, phone 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You will have a clear quote before any work starts.
Related advice
Windows and doors in Culmers
Culmers is within about 3 miles of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That is hard on the mastic around older windows and doors, especially on the side facing the sea. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you look after a building such as Graveney Primary School, its window and door frames need their mastic kept sound, just like a home’s. If you let a flat or house near Faversham station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Culmers is about 2 miles east of Faversham, in Kent. Homes, rented property, offices and hotels in Culmers is covered for sand mastic. Every job comes with our one-year guarantee. 922 places in Kent are on our list, from the larger towns to small villages. There’s also a page for Chelmsford, about 35 miles away.
Jobs for sand mastic in ME13 is quoted and booked the same way as anywhere else. If you’re just outside Culmers, we cover Graveney (1 mile north-east), Goodnestone (1 mile south-west), Broom Street (1 mile north-west), Slutshole (1 mile south-east) and Hernhill (1 mile south-east). We also work in nearby towns such as Ashford (13 miles south), Canterbury (7 miles south-east), Sittingbourne (9 miles west), Whitstable (4 miles north-east), Herne Bay (9 miles east) and Minster (9 miles north-west).
Local landmarks in Culmers
Locally, jobs take us to homes and businesses close to Queen Elizabeth's Grammar School and Mount Ephraim Gardens. The nearest railway station is Faversham station, about 2.2 miles west of the centre. A little further out are Whitstable and Tankerton Hospital (5.5 miles north-east). Open spaces near Culmers include Blean Woods RSPB Reserve.
What we’re called out for in Culmers
Sand mastic slowly weathers. It dries out, cracks and loses its grip from the frame or the masonry.
Keep an eye out for these signs:
- Gaps between timber frames and stone or brick
- Mastic round period door frames that has failed
- Weathered mastic on the most exposed windows
- Modern sealant on a period surround
In the older streets around Church of All Saints, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Before booking anyone
- Whether you can choose the colour
- How much experience the applicator has
- When the joint can take water or movement
- What guarantee comes with the work
What affects the quote in Culmers
Call for a quick quote. The main things that affect it are:
- Whether the work is at height
- The product the joint needs
- How many areas need sealing
- The old material and how stubborn it is
The cost depends on the amount of work, how hard the old material is to remove and how easy the joints are to reach. You’ll have a clear quote before any work starts, so you know where you stand.
What we need to know
You do not need to know the technical terms. It helps if you can tell us:
- How many joints, rooms or windows are involved
- The type of property
- Whether it has been sealed before
- Where the job is, and your postcode
Asking for a quote is easy: let us know the job and the location and its rough size. Photos by email help us understand the job.