West Berkshire · England
Sand Mastic in Catmore
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Catmore and across West Berkshire. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Old sand mastic that has cracked, crumbled or fallen out
- Silicone on a period window that looks wrong
- Weathered mastic on the most exposed windows
Leave it or put it right?
New sash windows are a major, costly change, and in listed buildings it may need consent. Where the frames are in good order, new mastic seals the surround. Around Catmore, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Leaving a failed joint normally makes the job bigger, not smaller, because water and mould keep working on it. If you’re not sure whether it needs doing, call 0345 464 0079 or drop us an email for an honest opinion and a quote.
Why us?
- Old sealant always removed completely
- Over 20 years’ experience
- ARBOMaster approved applicator
- Experience in homes, commercial sites and hotels
About our sand mastic in Catmore
Sand mastic skins over fairly quickly, but it takes longer to harden fully. Traditional guidance is not to paint over it and we’ll advise if you are redecorating. If you have gaps where the frame meets the masonry and tired mastic found when preparing windows for paint, we can help.
In a village or hamlet like Catmore, older cottages and farmhouses often have timber windows set in stone or brick. Not every older frame suits a modern silicone bead, so the sealant has to be chosen to suit the building.
All of our work is guaranteed for twelve months, in Catmore and everywhere else we cover.
- Location
- Catmore (RG20)
- Region
- West Berkshire
- Cover
- A year, on every job
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Surface by surface
Brick reveals
An open joint at a brick reveal lets weather in. New mastic seals the gap.
Tenement and terrace windows
Tenements and terraces often have many sash windows with ageing mastic. We work on single windows or whole elevations.
When it isn’t the sealant
It helps to know what we can’t do too:
- Rotten sashes, sills or window boxes (a joiner’s job)
- Sash cords, weights and draught-proofing of the sashes
- Decisions on consent for listed homes
If you are not sure, just call 0345 464 0079 or drop us an email and we will give you a straight answer.
Where we work in Catmore
- Period & listed homes
- Brick reveals
- Tenement windows
- Timber door frames
- Sash and case windows
- Stone surrounds
Looking after it afterwards
Looking after new joints is easy, and it makes a real difference:
- Leave the new mastic unpainted
- Inspect the joints round the windows every year or so
- Avoid patching sand mastic with silicone
- Get any rot dealt with first
Check the mastic when you check the paintwork. Catching cracks early keeps repairs small.
Renewing mastic before redecorating saves doing it twice. Paint over cracked mastic only covers it up.
Work for landlords, hotels and businesses
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.
Letting agents often deal with us directly. Tell us the address, the job and how access works.
Common questions in Catmore
Will you come out to Catmore?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Can you do sand mastic in Catmore?
Yes, Catmore is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job, and we’ll send you a clear quote.
Can tenants book the work?
We are happy to deal with the tenant, landlord or agent. Just make sure your landlord agrees.
Is it OK to seal over old sealant?
No, because it fails. We remove every bit of old sealant first, so the new joint bonds to clean surfaces.
Can I add another job to the visit?
Yes, and it often makes sense. Doing several areas at once is generally more efficient.
Do you hold any approvals?
Yes. We’re an ARBOMaster approved applicator.
What’s sand mastic made of?
It’s a mix of sand and a linseed-oil-based binder. It’s applied by hand and finished to sit neatly against the masonry.
Do you offer different sealant colours?
We help you choose a colour that suits. The product needed can limit the range.
How the visit works
Every visit runs the same way: we look at the joints together, protect the area around them, carry out the job and clear up. It usually takes anything from a few hours to a full day, depending on how many windows. In a small place like Catmore, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We check each window surround and the condition of the joint.
- 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.
How to prepare
- For business premises, tell us about site rules or sign-in
- Try not to wet indoor joints just before the visit
- Keep pets and children clear of the area while we work
Get a quote
For a quote, call 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. We’ll give you a clear price before any work starts.
Advice
Can I do it myself?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
What sand mastic looks like in Catmore
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.
Around Catmore, as everywhere, sand mastic is only as good as the preparation behind it. In the older streets around Church of St Margaret, the joint between an old wall and a newer frame is generally the first place rain gets in.
Catmore is about 6 miles south-east of Wantage, in West Berkshire. Anywhere in RG20, we can carry out sand mastic at your property. Our West Berkshire coverage runs to 155 places, and Catmore is one of them. We also work in Reading, around 17 miles away.
Work in RG20 is quoted and booked the same way as anywhere else. If you’re just outside Catmore, we cover Farnborough (2 miles north-west), Brightwalton (2 miles west), Stanmore (2 miles south-east), Brightwalton Green (2 miles south-west) and West Ilsley (2 miles north-east). Further out, we also cover Newbury (8 miles south), Thatcham (9 miles south-east), Burghfield Common (15 miles south-east), Speenhamland (8 miles south), Hungerford (10 miles south-west) and Calcot (14 miles south-east).