Reading · England
Sand mastic for sash & case windows in Caversham, Reading
Problem with your window and door surrounds in Caversham? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Draughty sash windows at the surround
- Gaps round a timber door in stone or brick
- Mastic that needs renewing before redecorating
Should I try it myself first?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
About our sand mastic in Caversham
On many period windows, sand mastic looks right and suits the building. On modern frames we’d normally use a flexible sealant, and we’ll talk through which suits your home. If you have old sand mastic that has cracked, crumbled or fallen out and mastic worn away on windows facing the weather, we can help.
Caversham mixes older streets, where windows have often been replaced, with newer estates fitted with uPVC. In every case, the joint between frame and wall is what keeps water out.
Every job comes with our one-year guarantee, wherever you are in Reading.
- Where
- Caversham (RG4)
- Region
- Reading
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What sand mastic looks like in Caversham
London and the South East are among 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 Mapledurham House (about 3 miles west) are a reminder that the area around Caversham has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
If you live in an older home near Grace Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. For site and facilities teams at buildings such as The Hill Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
Caversham is about 2 miles north of Reading, in Reading. If you need sand mastic in Caversham, it’s easy to get a quote: please ring 0345 464 0079 or email us. We cover Reading from our Crawley base. Caversham is one of 34 towns and villages in Reading where we work.
Postcode districts we cover here for sand mastic: RG4. If you need sand mastic at a property on Marshland Square, Church Road and Buckingham Gate or a nearby road, our applicators can take on the job. You’ll find Caversham on the B3345, so it’s easy for us to get to. Other places close to Caversham include Emmer Green (1 mile north-east), Caversham Park Village (1 mile north-east), Lower Caversham (1 mile south), Caversham Heights (1 mile west) and Littlestead Green (1 mile north-east). Within a short drive, we also cover Norcot (3 miles south-west), Tilehurst Within (3 miles south-west), Shinfield (5 miles south), Arborfield Garrison (7 miles south-east), Horncastle (3 miles south-west) and Whitley Wood (4 miles south). Being one of Reading’s larger places, Caversham has every kind of property, from flats to offices.
Landmarks near Caversham
In Caversham, that means homes and buildings near Chiltern Nursery Nurse Training School, The White Horse pub and Eldon Square. The nearest railway station is Reading station, roughly 1.3 miles south. A little further out are Royal Berkshire Hospital (1.9 miles south) and Broad Street Mall (1.6 miles south). Green spaces nearby include South Lake and Sonning Hill.
Your questions about sand mastic in Caversham
Is Caversham in your area for sand mastic?
Yes, Caversham is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear quote.
I let a flat near Reading station. Can you help?
Yes. We work for landlords and agents as well as householders, and several properties can go on one quote. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we’ll give you a clear price.
Do I need to be at home?
It depends on the job. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
Where is Mr Mastic based?
We are based in Crawley, and we work across South East England, London and Scotland.
Is the work guaranteed?
Our 12-month guarantee applies to all our work.
What should I tell you?
Only a few details: the address or postcode, what’s wrong and any access issues. After that, simply ring 0345 464 0079 or send us an email.
What is sand mastic?
A traditional pointing material made from sand and a linseed-oil-based binder for the joint between timber frames and masonry.
Can I add another job to the visit?
Yes. Just list everything you need and you will get one quote.
How the job changes by surface
Timber door frames
Doors face weather and wear, so their mastic can fail sooner. It’s renewed by hand.
Sash and case windows
On a sash window, the mastic joint shows on the outside, so a neat, even finish matters.
Landlords, agents and businesses in Caversham
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together, and we’re fully insured for the work.
In hotels, rooms out of use cost money, so we plan the work room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
Keeping the joints in good condition
Good habits help new joints last longer. A few tips:
- Renew mastic before redecorating the windows
- Leave the new mastic unpainted
- Don’t run silicone over sand mastic
- Ask a joiner to look at soft timber first
Make sure water drains away from the window surround. Constant wetting wears the mastic faster.
Sound mastic protects the frame. Once it fails, water can sit against the timber, which can lead to rot.
What affects the quote in Caversham
The price is agreed before any work begins. It takes into account:
- Mould in or behind the old joints
- The size of the job
- The product the joint needs
- How much old sealant there is and how hard it is to remove
We don’t show prices on the website, because the cost depends so much on the job itself. For a quick quote, please call 0345 464 0079 or drop us an email.
Helping us quote
When you call or email, these details help:
- Any previous sealing or DIY work
- Roughly how big the job is
- Any access issues, like height or stairs
- The problem you’ve noticed
Need a quote? Please phone 0345 464 0079 or send us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
How the visit works
Most of a good job is in the preparation, and we do not rush it. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours per window, depending on the condition of the joints. For a job in Caversham, we need access to where the work is and somewhere nearby to park. For outside work, let us know about side access, gates and any upper-floor joints.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic is not too thick.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
How to prepare
- Let us know about stairs, lifts or work at height
- Keep pets and children clear of the area while we work
- Tell us about any water getting in
Get a quote
For sand mastic in Caversham, ring 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
Related advice
Places near Caversham
More services for Caversham
What we’re called out for in Caversham
Paint, silicone or cement used over old mastic causes problems. They do not suit the joint, and they normally need raking out.
Common reasons people contact us are:
- Silicone on a period window that looks wrong
- Wind and rain getting in round a sash window
- Mastic that needs renewing before redecorating
- Failed mastic on an exposed elevation
Rented homes near Reading station change hands often, and older sash windows in a rental need their mastic kept sound to keep the weather out.
Questions to ask before booking
- Whether you can choose the colour
- Whether the sealant suits the joint
- How the surfaces are prepared before sealing
- What the cure time is