Oxfordshire · England
Catslip Sand Mastic
Professional sand mastic in and around Catslip, with old sealant always removed completely and a 12-month guarantee.
- Failed mastic on an exposed elevation
- A silicone bead on a sash window that spoils the look
- Gaps where the frame meets the masonry
What sand mastic looks like in Catslip
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Greys Court (about 2.2 miles south-east) are a reminder that the area around Catslip has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you live in an older home near Church of St Bartholomew, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. For site and facilities teams at buildings such as Nettlebed Community School, the mastic around its windows and doors needs looking after like any other building’s.
Catslip is about 7 miles north of Caversham, in Oxfordshire. Homes, rented property, offices and hotels in Catslip can book us for sand mastic. Every job comes with our one-year guarantee. Across Oxfordshire, we cover 443 places, and Catslip is one of them. You can also see our page for Reading, about 9 miles away.
Postcode districts we cover here for sand mastic: RG9. If you are just outside Catslip, we cover Nettlebed (1 mile north-west), Highmoor (1 mile south-west), Highmoor Cross (1 mile south), Bix (2 miles south-east) and Middle Assendon (2 miles east). We also work in nearby towns such as Didcot (12 miles west), Abingdon-on-Thames (15 miles north-west), Thame (12 miles north), Henley-on-Thames (4 miles south-east), Benson (6 miles north-west) and Chinnor (9 miles north).
What’s near Catslip
Locally, jobs take us to homes and businesses close to The Sun Inn Public House and the streets around them. The nearest railway station is Henley-On-Thames station, about 4.4 miles south-east of the centre. The countryside around Catslip includes Warburg Nature Reserve.
How we handle sand mastic in Catslip
Silicone on a period window often looks wrong and is not always the right material. Sand mastic is the traditional choice and we can swap the silicone for it. We work on tenement windows, period & listed homes and stone surrounds, and common reasons people get in touch are crumbling sand mastic round a window and weathered mastic on the most exposed windows.
Mastic can only go onto a dry, clean joint, so window work in Catslip is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
You get a 12-month guarantee, the same in Catslip as everywhere else we work.
- Place
- Catslip (RG9)
- Region
- Oxfordshire
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Nearby places to Catslip
What else we do in Catslip
Landlord and commercial work in Catslip
In hotels, rooms out of use cost money, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
Why deal with it now?
A silicone bead can be quicker, but it can look wrong on a period surround. Sand mastic is the traditional material and finishes neatly against the masonry. Around Catslip, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Doing several joints on one visit usually makes better use of the time than several visits, so tell us about everything that needs sealing. You’ll get one clear quote for the whole job.
Why book with us
- Domestic, commercial and hotel work
- Anti-fungal silicone where joints get wet
- Rated 4.9 stars on Google
- Over 20 years’ experience
Take a look at our cost guide or customer reviews.
What affects the cost of sand mastic
The price is agreed before any work begins. It takes into account:
- The type of sealant required
- The number and length of the joints
- When we can work, for business premises
- How easy the joints are to reach
What it costs depends on the size of the job, how hard the old material is to remove and access to the work. We give a clear quote before work begins, so you know where you stand.
What we need to know
There’s no need for technical detail. Just tell us:
- Whether it has been sealed before
- If it’s domestic, commercial or a hotel
- The problem you’ve noticed
- How many joints, rooms or windows are involved
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we will explain what’s involved before giving you a price.
Catslip questions
Is Catslip in your area for sand mastic?
Yes. Our work covers London and the South East, and Catslip is part of that. You can phone 0345 464 0079 or email us and let us know what needs doing, and we will send you a clear quote.
I let a flat near Henley-On-Thames station. Can you help?
Yes, we work for landlords and agents. Just call 0345 464 0079 or drop us an email and tell us about the property, and we’ll send you a clear quote.
Do you guarantee sand mastic work?
There’s a 12-month guarantee on every job, sand mastic included.
How long does sand mastic take to go off?
The surface skins quite quickly and it hardens fully over a longer time. The weather and joint depth both affect it.
Is it OK to seal over old sealant?
No. Fresh sealant does not stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Will the old sealant be removed?
Yes, every time. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
Do you have insurance?
Yes. We’re fully insured, with over 20 years’ experience in sealant work.
Can you do several jobs on one visit?
Yes, we can. More than one area can go on one quote.
What happens on the day
You don’t need to clear the whole room or building before we come, just the space around the work. Everything nearby is protected, and the work takes a few hours for a single window, longer for several for a typical job. For a village or hamlet like Catslip, 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.
- First, we look at the surrounds with you and agree what needs doing.
- We rake out the old mastic and clean the joint.
- Large voids are packed out first, so the mastic isn’t too thick.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- The finish is dressed so it sits neatly against the stone or brick.
Preparing for the visit
- Plan for the work area to be out of bounds to pets and children
- Clear items away from the joints we are working on
- Mention if the joints have been sealed before
Ask for a quote
If you’re in Catslip and need sand mastic, ring 0345 464 0079 or send us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Read more
How the job changes by surface
Period and listed homes
A traditional finish suits a period property.
Stone surrounds
Old stone surrounds are often uneven, so the joint varies in width. We shape it by hand to follow the stone.
When to call us in Catslip
Over the years, sand mastic weathers. It dries out, cracks and loses its grip on the stone or timber.
Common reasons people contact us include:
- Silicone on a period window that looks wrong
- Cracked mastic round a front door frame
- Old sand mastic that has cracked, crumbled or fallen out
- Failed mastic on an exposed elevation
For landlords with property near Henley-On-Thames station, any sash windows need sound mastic to keep draughts and rain out.
What your quote should include
- Whether VAT is included
- Whether the sealant suits the joint
- The length of the guarantee
- What happens if they find a problem under the old sealant
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.