Oxfordshire · England
Sand Mastic in Highmoor
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for Highmoor, backed by a 12-month guarantee. Call for a quick quote.
- Modern sealant on a period surround
- Failed mastic on an exposed elevation
- Old sand mastic that has cracked, crumbled or fallen out
Sand mastic in Highmoor, 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 work on tenement windows, sash and case windows and timber door frames, and common reasons people get in touch are mastic round period door frames that has failed and old sand mastic that has cracked, crumbled or fallen out.
Mastic can only go onto a dry, clean joint, so window work in Highmoor is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
Whatever the size of the job, you get the same 12-month guarantee.
- Place
- Highmoor (RG9)
- Region
- Oxfordshire
- Cover
- One year on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Your questions about sand mastic in Highmoor
Do you cover Highmoor for sand mastic?
Yes. Our work covers London and the South East, and Highmoor is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job.
I let a flat near Henley-On-Thames station. Can you help?
Yes. We work for landlords and letting agents as well as householders, and several properties can be quoted together. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Is it possible to take out silicone and use sand mastic instead?
Yes, it’s a common request. The old silicone has to come out completely so the mastic beds in well.
Do you offer different sealant colours?
In most cases you can choose. We will tell you which colours the right product comes in and agree one before work begins.
Will you leave a mess?
Tidy work is part of the job. Nearby surfaces are protected.
Do I need to be at home?
Access is agreed with you when the job is booked. Indoors, that generally means someone at home.
Is it possible to paint over sand mastic?
It’s traditionally left unpainted, as guidance on traditional windows advises. Ask us before decorating.
Will there be a smell?
There can be a smell while the sealant cures, which fades as it sets. Ventilation helps.
Frames and glazing around Highmoor
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. Historic houses like Greys Court (about 2 miles south-east) are a reminder that the area around Highmoor has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
Rented homes near Henley-On-Thames station change hands often, and any sash windows need sound mastic to keep draughts and rain out. If you live in an older home near Church of St Paul, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Managing a site like Stoke Row Church of England School? Then larger buildings have plenty of frames, and the mastic around each one ages.
Highmoor is about 4 miles north-west of Henley-on-Thames, in Oxfordshire. From the centre of Highmoor to the outskirts, sand mastic is available for homes and businesses alike. Highmoor is one of 443 towns and villages in Oxfordshire we cover. For nearby work, see our Reading page, about 7 miles away.
We work across the RG9 postcode area for sand mastic. Local streets include The Glebe and Holly Close, and we cover them all. If you’re just outside Highmoor, we cover Highmoor Cross (1 mile south-east), Shepherd's Green (1 mile south-east), Catslip (1 mile north-east), Nettlebed (2 miles north) and Kingwood Common (2 miles south). Further out, we also cover Didcot (11 miles west), Abingdon-on-Thames (15 miles north-west), Thame (13 miles north), Henley-on-Thames (4 miles south-east), Benson (6 miles north-west) and Chinnor (11 miles north).
Local landmarks in Highmoor
Around Highmoor, our work takes us to homes and buildings near The Dog and Duck pub. For rail, the closest station is Henley-On-Thames station, about 4.5 miles east of the centre. The countryside around Highmoor includes Warburg Nature Reserve.
How it works
When we get to you, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. Most jobs then take a few hours per window, depending on the condition of the joints. For a village or hamlet like Highmoor, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
Preparing for the visit
- Mention any leaks or damp you’ve noticed
- For business premises, tell us about site rules or sign-in
- Let us know about earlier repairs to the joints
Ask for a quote
We do not publish a price list, because every job is different. Instead, we give you a clear price for your job. To arrange one, ring 0345 464 0079 or send us an email.
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Why it’s worth doing now in Highmoor
Filling over old, loose mastic does not last. We remove the loose material first so the new mastic stays put. In a small place like Highmoor, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Call for a quick quote and we will explain what it covers.
Why us?
- Over 20 years’ experience
- We never seal over old sealant
- Domestic, commercial and hotel work
- Trusted Arbo and Everbuild sealants
What sealant work can’t fix
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- Damaged stone surrounds
- Putty and glazing repairs
- Rotten sashes, sills or window boxes (a joiner’s job)
If in doubt, phone 0345 464 0079 or email us and we will say what we think before you book.
Surfaces we seal
- Timber door frames
- Sash and case windows
- Brick reveals
- Stone surrounds
- Tenement windows
- Period & listed homes
Can I do it myself?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Also near Highmoor
Also in Highmoor
Keeping the joints in good condition
How long the joints last depends on use and care. Here’s what we suggest:
- Leave the new mastic unpainted
- Avoid heavy scraping on the mastic joint
- Avoid patching sand mastic with silicone
- Sort the mastic before the decorators arrive
Do not touch or press the mastic while it hardens. It skins over quickly, but takes longer to harden fully.
Good mastic helps keep the frame dry. Once it fails, water can sit against the timber and timber that stays wet can rot.
What affects the cost of sand mastic
Your quote is based on your job. We take into account:
- The number and length of the joints
- Whether there’s mould to deal with
- The number of rooms or windows
- How easy the joints are to reach
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you are not sure whether it needs doing, call 0345 464 0079 or email us for an honest opinion and a quote.
What we need to know
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- If it’s domestic, commercial or a hotel
- The rough size of the job
- Where the property is
- A few pictures by email, if you can
We quote each job on its own, so the first step is telling us about yours. Just phone 0345 464 0079 or email us with the details, and pictures are welcome.
Landlords, agents and businesses in Highmoor
For anyone letting property in or around Highmoor, jobs at different addresses can be quoted together. Send us the addresses and the work at each.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.