West Sussex · England
Walstead Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Walstead, with a one-year guarantee on every job. Ask us for a quote.
- Wind and rain getting in round a sash window
- Old sand mastic that has cracked, crumbled or fallen out
- Modern sealant on a period surround
Landlords, agents and businesses in Walstead
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance.
In hotels, rooms out of use cost money, so the work can be planned room by room. We have worked in hotels as well as homes and businesses.
How we handle sand mastic in Walstead
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s a mix of sand and a linseed-oil-based binder and built up by hand. On period homes, it looks right where silicone wouldn’t. We work on brick reveals, sash and case windows and period & listed homes, and the jobs we see most are weathered mastic on the most exposed windows and cement or filler used on old window joints that has cracked.
In a village or hamlet like Walstead, older cottages and farmhouses often have timber windows set in stone or brick. Not every older frame suits a modern silicone bead, and sometimes a traditional sand mastic is the better choice.
There’s a 12-month guarantee on every job.
- Location
- Walstead (RH16)
- Wider area
- West Sussex
- Guarantee
- 12 months on all our work
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Leave it or put it right?
Replacing sash windows is a big decision for a period home, and in listed buildings it may need consent. Where the frames are in good order, new mastic seals the surround. Around Walstead, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we will explain the quote if you ask.
Why book with us
- Anti-fungal silicone where joints get wet
- Over 20 years’ experience
- Every job guaranteed for a year
- We leave the area clean and tidy
Aftercare tips
How long the joints last depends on use and care. Here’s what we suggest:
- Avoid heavy scraping on the mastic joint
- Plan mastic work ahead of painting
- Leave the new mastic unpainted
- Inspect the joints round the windows every year or so
Look at the mastic when you look over the windows. Catching cracks early keeps repairs small.
Small cracks are a sign the mastic is ageing. Renewing it then is simpler than waiting until it falls out.
Questions from Walstead
Do you cover Walstead for sand mastic?
Yes, Walstead is within the area we cover. We work across London and the South East. Just phone 0345 464 0079 or drop us an email with a few details of the job.
Will you come out to Walstead?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
How long does sand mastic take to harden?
A skin forms quite soon, but full hardening takes longer. We’ll explain what to expect before we leave.
Do you offer different sealant colours?
We will suggest a colour to suit the surroundings, from white and clear to greys and other shades. The choice depends on the product the joint needs.
Will the old sealant be removed?
Always. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
What does sand mastic cost?
We don’t publish prices, because the cost depends on the job: its size, the old material, access and the product needed. You will get a clear quote before any work starts.
Do I have to be there?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
Are you ARBOMaster approved?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
Other services in Walstead
What the job involves on each surface
Period and listed homes
Many older homes were built with sand mastic round the windows. On listed buildings, check with your planning authority first.
Brick reveals
Brick reveals round timber windows are often pointed with sand mastic. It suits older brickwork.
How we quote for sand mastic
You’ll get a clear quote before work begins. It’s based on:
- Whether there’s mould to deal with
- How easy the joints are to reach
- The product the joint needs
- How much old sealant there is and how hard it is to remove
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
What to tell us for a quote
Photos by email are helpful but not essential. Try to tell us:
- Where the job is, and your postcode
- What’s wrong with the joints now
- The type of property
- Any previous sealing or DIY work
Every job is quoted individually, so start by telling us what you need. Just phone 0345 464 0079 or email us with the details, and pictures are welcome.
What sealant work cannot fix
We won’t take on work that will not last, so here’s what sealant cannot put right:
- Putty and glazing repairs
- Rotten sashes, sills or window boxes (a joiner’s job)
- Damaged stone surrounds
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we will tell you honestly before booking.
Joints and surfaces we work on
- Brick reveals
- Period & listed homes
- Stone surrounds
- Sash and case windows
- Tenement windows
- Timber door frames
Windows and doors in Walstead
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Ockenden Manor (about 3.2 miles west) are a reminder that the area around Walstead has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
For an older house near a landmark such as Church of the Good Shepherd, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Schools such as Northlands Wood Primary Academy are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages. For landlords with property near Haywards Heath station, any sash windows need sound mastic to keep draughts and rain out.
Walstead is about 1 mile east of Haywards Heath, in West Sussex. Across the RH16 area, our applicators can take on sand mastic. We cover 371 towns and villages across West Sussex, from the larger towns to small villages. For nearby work, see our Crawley page.
All of RH16 is within our area for sand mastic. If you need sand mastic at a property on Sage Avenue, Ivy Drive and Juniper Place or anywhere close by, we can help. Walstead is on the B2111, so it’s easy for us to get to. We also cover the places around Walstead: Lindfield (1 mile north-west), Horsted Keynes (3 miles north-east), Ardingly (3 miles north), Furner's Green (4 miles east) and Highbrook (4 miles north). Larger places within reach include Crawley (9 miles north-west), Horsham (12 miles west), Burgess Hill (4 miles south-west), East Grinstead (9 miles north), Shoreham-by-Sea (14 miles south-west) and Broadfield (9 miles north-west).
What’s near Walstead
Locally, jobs take us to homes and businesses close to Oathall Community College, The Snowdrop Inn and Eastern Road Nature Reserve. The closest station to Walstead is Haywards Heath station, about 1.5 miles west. Nearby you’ll also find Parish Museum (0.9 miles north-west) and Princess Royal Hospital (1.2 miles south-west). For a walk, there’s Ashenground and Bolnore Woods.
What we do, step by step
Before we leave, we go over the finished joints with you and explain the cure time. The visit itself normally takes a few hours per window, depending on the condition of the joints, depending on the size of the job. For a village or hamlet like Walstead, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic isn’t too thick.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Preparing for the visit
- Mention any parking rules near the property
- Tell us about any previous sealing or DIY attempts
- Keep pets and children clear of the area while we work
Getting a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. When it suits you, call 0345 464 0079 or email us.