Hertfordshire · England
Sand mastic for sash & case windows in Ware, Hertfordshire
Sand mastic for Ware and the surrounding area: careful preparation, the right product and tidy work. Call for a quick quote.
- Gaps where the frame meets the masonry
- Crumbling sand mastic round a window
- Modern sealant on a period surround
Sand mastic in Ware
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, applied by hand. On period homes, it looks right where silicone wouldn’t. Common call-outs are for patchy fillers round a sash window and gaps where the frame meets the masonry, on period & listed homes, tenement windows and timber door frames.
In a town like Ware, older houses sit alongside newer estates, with windows of every age. In every case, the joint between frame and wall is what keeps water out.
Whatever the size of the job, you get the same one-year guarantee in Ware and across Hertfordshire.
- Location
- Ware (SG12, SG9)
- Wider area
- Hertfordshire
- Guarantee
- 12 months on all our work
- Quote
- A clear price before work begins
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
DIY versus a professional finish
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
Towns and villages near Ware
More services for Ware
Questions from Ware
Is Ware in your area for sand mastic?
Yes, Ware is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or send us an email and let us know what needs doing.
Is there a guarantee on sand mastic in Ware?
All our work, in Ware and everywhere else, comes with a 12-month guarantee. We are also fully insured and ARBOMaster approved.
What’s sand mastic made of?
A traditional pointing material made from sand and a linseed-oil-based binder, used between timber frames and stone or brick.
Do you offer different sealant colours?
We help you choose a colour that suits, from white and clear to greys and other shades. The product needed can limit the range.
Should I try DIY first?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. If it doesn’t work out, we can redo it.
When will the new mastic be hard?
A skin forms quite soon, but full hardening takes longer. We’ll tell you what to expect for your job.
Is it possible to paint over sand mastic?
Traditional guidance is not to paint over sand mastic. Ask us before you decorate around it and we’ll talk you through it.
Do you work for hotels and businesses?
Yes. We have worked for hotels, offices and other businesses.
What sand mastic looks like in Ware
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Schools such as Christ Church CofE (VA) Primary School and Nursery are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages. In the older streets around Christ Church Ware, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. If you let a flat or house near Ware station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Ware is about 7 miles north-west of Harlow, in Hertfordshire. Anywhere in SG12, our applicators can take on sand mastic. Across Hertfordshire, we cover 381 places, and Ware is one of them. You can also see our page for London, roughly 22 miles from Ware.
We work across SG12 and SG9 for sand mastic and the streets around it. Whether your property is on High Street, Station Road and London Road or anywhere close by, our applicators can take on the job. You will find Ware on the A10 and A119, which makes it straightforward to reach. Neighbouring places we cover for sand mastic include Thundridge (1 mile north), Cold Christmas (2 miles north-east), Wadesmill (2 miles north), Chapmore End (2 miles north-west) and Tonwell (2 miles north-west). We also work in nearby towns such as Stevenage (9 miles north-west), St Albans (13 miles west), Bishop's Stortford (9 miles north-east), Welwyn Garden City (7 miles west), Harpenden (14 miles west) and Hitchin (14 miles north-west).
Landmarks near Ware
Typical jobs here are in homes near Hertford Regional College, The Chauncy School and The Albion Public House and the streets around them. Ware has its own railway station: Ware station. Nearby you’ll also find Barrowfield (1.2 miles south-west) and Hertford County Hospital (2.8 miles south-west). Open spaces near Ware include King's Meads.
What we do, step by step
You do not need to clear the whole room or building before we come, only the area right around the joints. We protect the rest, and the job takes anything from a few hours to a full day, depending on how many windows in most cases. Parking in a town like Ware is generally straightforward, but tell us if there’s a driveway or any restrictions, and mention if the work is upstairs, in a flat or high on the outside.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
Getting ready for the visit
- On commercial sites, let us know about site rules
- Clear the area around the work
- Tell us if parking is tricky
Get a quote
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.
Advice
Looking after it afterwards
Good habits help new joints last longer. Our tips:
- Get any rot dealt with first
- Avoid heavy scraping on the mastic joint
- Do not run silicone over sand mastic
- Inspect the joints round the windows every year or so
Leave the new mastic unpainted, as traditional guidance advises. Ask us before any decorating around it.
Good mastic helps keep the frame dry. Once it fails, water can sit against the timber, which can lead to rot.
Why it’s worth doing now in Ware
New sash windows are a major, costly change and on a listed home, consent may be needed. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. Black mould and gaps in sealant don’t fix themselves, and in a busy home in Ware they get worse with every use. Replacing the sealant now is the simplest fix.
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you are unsure, phone 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
What you get with us
- Quality sealants from Arbo and Everbuild
- We leave the area clean and tidy
- Approved under the ARBOMaster scheme
- Domestic, commercial and hotel work
See what affects the cost and what customers say.
Different surfaces, different methods
Stone surrounds
Stone surrounds suit sand mastic well. It finishes to look like part of the surround.
Tenement and terrace windows
Where a building is shared, window work may involve neighbours so it’s worth checking responsibilities.
What affects the quote in Ware
For a quick quote, just ask. The main things that affect it are:
- Any working-time requirements on site
- Whether the work is at height
- The number of rooms or windows
- The size of the job
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs. Call for a quick quote and we’ll go through it with you.
Asking for a quote
To make quoting easier, please include:
- Roughly how big the job is
- If it’s domestic, commercial or a hotel
- Pictures of the joints, sent by email
- Where the job is, and your postcode
For a quick quote, get us on the phone, or email us if that is easier. Tell us about the joints that need doing and we will talk you through the work before giving you a price.
Landlord and commercial work in Ware
We also work for property managers and facilities teams. Several sites can go on one quote.
We work for landlords and agents as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.