Oxfordshire · England
Sand mastic for sash & case windows in Upper Basildon, Oxfordshire
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for householders, landlords and businesses in Upper Basildon. Fully insured, ARBOMaster approved and guaranteed for a year.
- Modern sealant on a period surround
- Gaps round a timber door in stone or brick
- Tired mastic found when preparing windows for paint
How to look after the new joints
Simple care keeps the joints in good condition. Our advice:
- Go gently near the mastic when preparing windows
- Check the mastic when you check the paintwork
- Ask us before painting near the mastic
- Keep sills and gutters clear so water drains away
Keep gutters and sills clear so water runs away from the surround. Water sitting against the mastic shortens its life.
Good mastic helps keep the frame dry. Once it fails, water can sit against the timber and timber that stays wet can rot.
Sand mastic for homes and businesses in Upper Basildon
Sand mastic doesn’t last for ever and gaps open up round the frame. Renewing it closes the gap so the surround looks right again. Common call-outs are for weathered mastic on the most exposed windows and patchy fillers round a sash window, across tenement windows, timber door frames and sash and case windows.
Somewhere as small as Upper Basildon, older homes often have timber frames set in stone or brickwork. Older buildings like these do not always suit modern silicone, so the sealant has to be chosen to suit the building.
We stand behind the work with a 12-month guarantee, so you’re not left on your own once the job is done.
- Place
- Upper Basildon (RG8)
- Wider area
- Oxfordshire
- Guarantee
- One year on every job
- Price
- A clear price before we start
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
When it isn’t the sealant
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- Sashes that rattle, stick or will not open
- Damaged stone surrounds
- Rotten sashes, sills or window boxes (a joiner’s job)
Not sure which it is? You can ring 0345 464 0079 or email us and we will tell you honestly before booking.
Where we work in Upper Basildon
- Timber door frames
- Sash and case windows
- Brick reveals
- Stone surrounds
- Period & listed homes
- Tenement windows
The process
We bring everything the job needs with us, so you don’t need to buy or prepare anything. Once we’ve agreed what’s being done, we protect the area and start. Most jobs take a few hours per window, depending on the condition of the joints. In a small place like Upper Basildon, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by checking each surround and agreeing the joints to renew.
- The loose and crumbling 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.
Getting ready for the visit
- Mention any leaks or damp you’ve noticed
- Tell us if parking is tricky
- Move anything stored near the joints
How to get a quote
Every job is quoted individually, so the first step is telling us about yours. Just ring 0345 464 0079 or email us with the details, and pictures are welcome.
Advice
Leave it or put it right?
Draughts round a sash window aren’t always the sashes. Gaps between the frame and the wall can be just as bad, and renewing the mastic closes them. Where a wall is exposed, as many are in small places like Upper Basildon, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Doing several joints on one visit usually makes better use of the time than several visits, so tell us about everything that needs sealing. We will give you a clear quote for the lot.
What you get with us
- ARBOMaster approved applicator
- A 12-month guarantee on all work
- Homes, businesses and hotels
- We are fully insured
Questions from Upper Basildon
I let a flat near Pangbourne station. Can you help?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we will send you a clear quote.
Do you cover Upper Basildon for sand mastic?
Yes. We work across London and the South East, and Upper Basildon is part of that. You can call 0345 464 0079 or send us an email and tell us what needs doing, and we’ll give you a clear price.
When will the new mastic be hard?
It takes a while. It skins first and hardens fully later, and we’ll tell you what to expect.
How long will you be here?
Typically it takes a few hours for a single window, longer for several. Bigger jobs take longer, and we will tell you how long to expect.
Do you hold any approvals?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Can you seal over the old sealant?
No, it won’t last. It can look neat for a few weeks, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
Can I paint the new mastic?
The usual advice is to leave sand mastic unpainted. If you are redecorating the window, ask us first and we will advise.
Does someone need to be in?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Nearby places to Upper Basildon
What else we do in Upper Basildon
Upper Basildon homes and the weather
With historic houses such as Basildon Park (about 1.4 miles north-east) nearby, there’s older building stock in the area around Upper Basildon as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For landlords with property near Pangbourne station, cracked sand mastic around sash windows lets in the draughts tenants complain about. If you look after a building such as Basildon C.E. Primary School, the mastic around its windows and doors needs looking after like any other building’s.
Upper Basildon is about 7 miles north-east of Thatcham, in Oxfordshire. Upper Basildon gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Our area takes in 443 places across Oxfordshire, large and small. For nearby work, see our Reading page.
Here we cover the RG8 postcode area for sand mastic. You’ll find streets such as Aldworth Road, Beckfords and Emery Acres, all of which we cover. Neighbouring places we cover for sand mastic include New Town (1 mile south-east), Stubbles (1 mile west), Ashampstead (2 miles west), Ashampstead Green (2 miles west) and Burnt Hill (2 miles south-west). Within a short drive, we also cover Didcot (10 miles north-west), Abingdon-on-Thames (15 miles north-west), Wantage (14 miles north-west), Henley-on-Thames (11 miles east), Grove (15 miles north-west) and Benson (10 miles north).
Local landmarks in Upper Basildon
Locally, jobs take us to homes and businesses close to St Andrew's School and The Red Lion pub, among other places. Upper Basildon’s nearest station is Pangbourne station, about 2.3 miles east of the centre. Well-known places in the area include Yattendon Castle (2.9 miles south-west). For a walk, there’s Hartslock.
Signs you need sand mastic in Upper Basildon
Rain on the window surround works into any crack and loosens it further. Exposed elevations generally fail first.
These are the problems we are asked about most:
- Gaps where the frame meets the masonry
- Cracked mastic round a front door frame
- Draughty sash windows at the surround
- Tired mastic found when preparing windows for paint
If you live in an older home near St Stephen's Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
What your quote should include
- How long to leave it before use
- How the joint is cleaned and prepared
- The length of the guarantee
- What happens if the job turns out different
Should I try it myself first?
A DIY attempt does not rule out a professional job. We cut it out and start again, so just mention it when you contact us.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
Surface by surface
Brick reveals
Brick reveals round timber windows are often pointed with sand mastic. It suits older brickwork.
Period and listed homes
Period homes look their best with traditional materials, and sand mastic is one of them.