Essex · England
Radwinter Sand Mastic
Professional sand mastic in and around Radwinter, with every bit of old sealant taken out first and a 12-month guarantee.
- Tired mastic found when preparing windows for paint
- Cement or filler used on old window joints that has cracked
- Gaps where the frame meets the masonry
Looking after it afterwards
A little care helps the new joints last. Our advice:
- Keep sills and gutters clear so water drains away
- Renew mastic before redecorating the windows
- Ask the planning authority about consent for listed or conservation-area homes
- Look over the window mastic once a year
Keep gutters and sills clear so water runs away from the surround. Constant wetting wears the mastic faster.
Renewing mastic before redecorating saves doing it twice. Painting over failed mastic hides the problem for a while.
Sand mastic in Radwinter, done properly
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s made from sand and a linseed-oil-based binder and built up by hand. On period homes, it looks right where silicone wouldn’t. We’re often asked to deal with mastic round period door frames that has failed and crumbling sand mastic round a window, on brick reveals, sash and case windows and tenement windows.
Mastic can only go onto a dry, clean joint, so window work in Radwinter is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
Every job is covered by a one-year guarantee, wherever you are in Essex.
- Where
- Radwinter (CB10)
- Wider area
- Essex
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
How the visit works
We work through the job in order: protection first, then preparation, sealing and a tidy-up. For most jobs that takes a few hours for a single window, longer for several. Somewhere like Radwinter needs a little journey planning: let us know about lanes, gates and parking. 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.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Preparing for the visit
- Mention any parking rules near the property
- Try not to wet indoor joints just before the visit
- Tell us about any previous sealing or DIY attempts
Getting a quote
Asking for a quote is easy: let us know what needs doing and where, and roughly how big it is. Photos by email help us understand the job.
Related advice
Different surfaces, different methods
Sash and case windows
The mastic round a sash window is on show, so a neat, even finish matters.
Period and listed homes
Sand mastic is the like-for-like choice for many period homes. On listed buildings, check with your planning authority first.
Can I do it myself?
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Signs you need sand mastic in Radwinter
Sand mastic slowly weathers. It dries out, cracks and loses its grip from the frame or the masonry.
Signs it’s time to call us include:
- Crumbling sand mastic round a window
- Draughts and rain around sash boxes
- Old cement repairs round a window that have failed
- A silicone bead on a sash window that spoils the look
Managing a site like Radwinter Church of England Voluntary Aided Primary School? Then larger buildings have plenty of frames, and the mastic around each one ages.
What to look for in a quote
- How long the guarantee is
- How hidden problems are handled
- Whether they seal over old material or remove it
- Whether you can choose the colour
Places near Radwinter
Also in Radwinter
Leave it or put it right?
If you’re redecorating, renew the mastic first. Paint over cracked mastic won’t stop the gaps and traditional guidance is to leave the new mastic unpainted. Older cottages and farmhouses around Radwinter can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
What you get with us
- Anti-fungal silicone where joints get wet
- 12-month guarantee on every job
- Approved under the ARBOMaster scheme
- We never seal over old sealant
Take a look at our cost guide and our reviews.
What sand mastic looks like in Radwinter
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 live in an older home near Church of St Mary the Virgin, the joint between an old wall and a newer frame is usually the first place rain gets in.
Radwinter is about 4 miles east of Saffron Walden, in Essex. We carry out sand mastic for homes and businesses in Radwinter and the surrounding area. Radwinter is one of 644 places in Essex where we work for sand mastic. For nearby work, see our Chelmsford page (20 miles or so).
Work in CB10 is quoted and booked the same way as anywhere else. You will find streets such as East View Close, Water Lane and Gillon Way. Neighbouring places we cover for sand mastic include The Common (1 mile north), Maple End (1 mile west), Wimbish (1 mile south-west), Hempstead (2 miles east) and Church End (3 miles north-west). We also work in nearby towns such as Braintree (13 miles south-east), Saffron Walden (4 miles west), Halstead (14 miles east), Great Dunmow (10 miles south), Stansted Mountfitchet (10 miles south-west) and Great Notley (13 miles south-east).
Near you in Radwinter
Nearby you’ll also find Castle Camps (3.3 miles north-east) and Saffron Walden Community Hospital (3.6 miles west). For a walk, there’s West Wood.
Honest limits
We won’t take on work that will not last, so these are the limits:
- Cracked or broken glass
- Whether work needs listed building consent
- Sashes that rattle, stick or won’t open
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly.
Where we work in Radwinter
- Tenement windows
- Timber door frames
- Brick reveals
- Sash and case windows
- Period & listed homes
- Stone surrounds
FAQs for Radwinter
Is there a guarantee on sand mastic in Radwinter?
All our work, in Radwinter and everywhere else, comes with a 12-month guarantee. We are also fully insured and ARBOMaster approved.
Can you do sand mastic in Radwinter?
Yes, Radwinter is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or email us with a few details of the job, and we will give you a clear quote.
Is it messy?
No. We protect the surfaces around the joints, and we clear up the old sealant and our materials before we leave.
Can you match the sealant colour?
In most cases you can choose. We’ll explain which colours are available.
Will the old sealant be removed?
Yes, always, and completely. New sealant will not bond properly to old, so any old material comes out before anything new goes in.
Do you work for hotels and businesses?
Yes. Larger jobs can be planned room by room or area by area.
Will there be a smell?
Sometimes, a little. It fades as the sealant cures, and ventilation helps.
Where are you based?
We work from Crawley. Our applicators cover Radwinter.