Wokingham · England
Charvil Sand Mastic
Sand mastic across Charvil and nearby, with old sealant always removed completely and a 12-month guarantee.
- Modern sealant on a period surround
- Cracked mastic round a front door frame
- Patchy fillers round a sash window
Keeping the joints in good condition
Looking after new joints is easy:
- Look over the window mastic once a year
- Go gently near the mastic when preparing windows
- Find out about consent before window work on a listed home
- Have rotten timber repaired before new mastic goes in
Do not run silicone over the new mastic. If anything cracks, get it looked at before trying a quick fix.
Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens.
Sand mastic in Charvil
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s a mix of sand and a linseed-oil-based binder and built up by hand. On period homes, it looks right where silicone wouldn’t. If you’re dealing with draughts and rain around sash boxes and gaps round a timber door in stone or brick, we can put it right, whatever the surface.
Houses in smaller places like Charvil can stand more in the open than those in a built-up town. That is hard on the mastic around frames and sills.
Big or small, you get the same one-year guarantee.
- Place
- Charvil (RG10)
- Wider area
- Wokingham
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
More services for Charvil
Common problems we fix in Charvil
Scraping and sanding before painting can loosen old mastic. It’s often found when windows are being prepared for paint.
The most common problems we see are:
- Window mastic to renew ahead of painting
- Draughty sash windows at the surround
- Weathered mastic on the most exposed windows
- Mastic round period door frames that has failed
Schools such as Waingels College are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
What to look for in a quote
- Whether they seal over old material or remove it
- Who turns up on the day
- When the joint can take water or movement
- What insurance they hold
Work for landlords, hotels and businesses
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance.
For anyone letting property in or around Charvil, jobs at different addresses can be quoted together. Send us the addresses and the work at each.
What happens if it’s left?
Filling over old, loose mastic does not last. Raking out and preparing the joint gives it a sound base so the new work lasts. In a smaller place like Charvil, wherever a wall is exposed, a failed outside joint is a real source of damp. Indoors, a failed seal lets water into floors and panels as it would anywhere.
The cost depends on the amount of work, how much old material has to come out and how easy the joints are to reach. We give a clear quote before any work starts.
What you get with us
- Experience in homes, commercial sites and hotels
- Any old sealant cut out fully, not covered over
- Trusted Arbo and Everbuild sealants
- Over 20 years’ experience
See our cost guide and customer reviews.
Windows and doors in Charvil
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
In the older streets around St Patrick's Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Letting a property close to Twyford station? Then any sash windows need sound mastic to keep draughts and rain out.
Charvil is about 2 miles north of Woodley, in Wokingham. From the centre of Charvil to the outskirts, we cover sand mastic for every kind of property. Our area takes in 35 places across Wokingham, from the larger towns to small villages.
Postcode districts we cover here for sand mastic: RG10. Local streets include Old Bath Road, Wenlock Edge and Pipistrelle Way. We also cover the places around Charvil: Twyford (1 mile east), Ruscombe (1 mile east), Whistley Green (1 mile south-east), Woodley (2 miles south) and Shiplake (2 miles north). We also work in nearby towns such as Reading (4 miles south-west), Wokingham (5 miles south), Earley (4 miles south-west), Crowthorne (8 miles south-east), Lower Earley (4 miles south-west) and Winnersh (3 miles south).
Near you in Charvil
Locally, jobs take us to homes and businesses close to The Piggott School, Polehampton Church of England Infant School and The Wagon And Horses Public House and the streets around them. Charvil’s nearest station is Twyford station, roughly 0.9 miles east of the centre. Nearby you will also find Royal Berkshire Hospital (3.7 miles south-west) and Berkshire Medical Heritage Centre Museum (3.6 miles south-west). For a walk, there’s Sonning Hill and South Lake.
How we quote for sand mastic
Jobs vary more than people expect. What affects the quote:
- Whether the work is at height
- When we can work, for business premises
- How much old sealant there is and how hard it is to remove
- Any mould that needs treating
Doing several joints on one visit is normally more efficient than separate visits, so it’s worth mentioning everything you’d like done. You’ll get one clear quote for the whole job.
What we need to know
To make quoting easier, please include:
- Pictures of the joints, sent by email
- Any previous sealing or DIY work
- The rough size of the job
- Access, such as stairs, a lift or height
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. A few pictures by email make the job easier to understand, and we’ll come back to you with a quote.
What we do, step by step
Once we are on site, we check the joints match what you told us. If anything is different, we explain it before carrying on. After that, the work takes a few hours per window, depending on the condition of the joints. Parking around Charvil is usually easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- We check the window surrounds and agree which joints need renewing.
- We rake out the old mastic and clean the joint.
- Deep voids are packed so the mastic is the right thickness.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The finish is dressed so it sits neatly against the stone or brick.
Before we arrive
- Clear the area around the work
- Mention any tricky access
- Mention any parking rules near the property
Ask for a quote
Want a quote for sand mastic? Please ring 0345 464 0079 or email us and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
Related advice
Common questions in Charvil
Do you cover Charvil for sand mastic?
Yes. We work across London and the South East, and Charvil is part of that. You can ring 0345 464 0079 or send us an email and tell us what needs doing.
I let a flat near Twyford station. Can you help?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before work begins.
Can you replace silicone on a period window with sand mastic?
Yes, we do this often. All the old silicone is removed first so the mastic beds in well.
How long does sand mastic take to harden?
The surface skins quite quickly, then hardens over a longer period. Timing depends on the weather and the joint.
Which products do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we will explain our choice.
Can I do it myself?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Will it make a mess?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
How long does the job take?
Typically it takes anything from a few hours to a full day, depending on how many windows. Bigger jobs take longer.
Should I try it myself first?
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.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.