Wokingham · England
Sand mastic for sash & case windows in Twyford, Wokingham
Our applicators work in Twyford on traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Failed mastic on an exposed elevation
- Mastic dropping out of the joint
- Cement or filler used on old window joints that has cracked
Sand mastic in Twyford
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s made from sand and a linseed-oil-based binder, applied by hand. On period homes, it looks right where silicone wouldn’t. We work on stone surrounds, period & listed homes and tenement windows, and the jobs we see most are old cement repairs round a window that have failed and open joints round the window box.
Houses in smaller places like Twyford can stand more in the open than those in a built-up town. That is hard on the mastic around frames and sills.
Every job comes with a one-year guarantee.
- Location
- Twyford (RG10)
- Region
- Wokingham
- Cover
- One year on every job
- Quote
- A clear price before we start
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Work for landlords, hotels and businesses
We work for letting agents and landlords as well as householders. Resealing between tenancies keeps a property looking cared for.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Twyford questions
Can you do sand mastic in Twyford?
Yes. Our work covers London and the South East, and Twyford is part of that. You can call 0345 464 0079 or email us and let us know what needs doing.
Will you come out to Twyford?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Do I have to be there?
If the work is inside, we need someone to let us in. Once we’ve agreed the job, you do not need to watch us work.
Can you work on commercial sites?
Yes. Hotels, offices and other businesses use us, and we are fully insured.
How long does sand mastic take to go off?
A skin forms quite soon, but full hardening takes longer. We will tell you what to expect for your job.
Is it possible to take out silicone and use sand mastic instead?
In most cases. We remove the silicone and clean the joint, then point it with sand mastic.
Can new sealant go over the old?
No. The old sealant always comes out first, so the new joint bonds to clean surfaces.
What should I tell you?
The location, the problem and the rough size of the job. If you can, email a few photos.
What happens on the day
Before we leave, we go over the finished joints with you and tell you how long to leave it. The visit itself usually takes a few hours for a single window, longer for several, depending on how much there is to do. A visit to Twyford is planned like any other: the time, the access and where to park are agreed in advance. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We start by checking each surround and agreeing the joints to renew.
- Old, loose mastic is raked out and the joint cleaned.
- We pack any deep gaps so the mastic sits at the right depth.
- 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
- Clear items away from the joints we’re working on
- Let us know about parking restrictions
- Try not to wet indoor joints just before the visit
Ask for a quote
To get a quote, phone 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. We’ll give you a clear quote before any work starts.
Read more
Should I try it myself first?
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
Also near Twyford
Other services in Twyford
Frames and glazing around Twyford
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Homes close to Church of St Mary include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Rented homes near Twyford station change hands often, and any sash windows need sound mastic to keep draughts and rain out.
Twyford is about 2 miles north-east of Woodley, in Wokingham. Jobs in Twyford get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Our area takes in 35 places across Wokingham, large and small.
Postcode districts we cover here for sand mastic: RG10. Whether your property is on Station Road, High Street and London Road or anywhere close by, we can help. Neighbouring places we cover for sand mastic include Ruscombe (1 mile north-east), Charvil (1 mile west), Whistley Green (1 mile south), Hare Hatch (1 mile north-east) and Hurst (2 miles south). We also work in nearby towns such as Reading (5 miles south-west), Wokingham (5 miles south), Earley (4 miles south-west), Crowthorne (8 miles south), Lower Earley (4 miles south-west) and Winnersh (3 miles south).
What’s near Twyford
We work in homes and buildings around Loddon Nature Reserve, The Piggott School and Blessed Hugh Faringdon Catholic School, among other places. There’s a railway station in Twyford itself: Twyford station. A little further out are Royal Berkshire Hospital (4.5 miles south-west) and Frazer Nash Archives (3.8 miles north). Open spaces near Twyford include South Lake and Alder Moors.
Different surfaces, different methods
Period and listed homes
Period homes look their best with traditional materials, and sand mastic is one of them.
Timber door frames
A neat sand mastic joint round a front door suits a period home.
Looking after it afterwards
Looking after new joints is easy:
- Sort the mastic before the decorators arrive
- Keep modern sealant off the mastic
- Have rotten timber repaired before new mastic goes in
- Check the mastic when you check the paintwork
Keep gutters and sills clear so water runs away from the surround. Water sitting against the mastic shortens its life.
Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens as more mastic falls out.
When to call us in Twyford
Timber frames move with the seasons. That movement opens up the mastic joint little by little.
Signs it’s time to call us include:
- Cement or filler used on old window joints that has cracked
- Window mastic to renew ahead of painting
- Draughty sash windows at the surround
- Mastic round period door frames that has failed
Schools such as Polehampton Church of England Infant School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Questions to ask before you book
- Whether the sealant suits the joint
- How long the guarantee is
- How hidden problems are handled
- Which colour the sealant will be
What we cannot put right
New sealant can’t fix everything, and we’ll tell you before work begins. Sealant won’t put right:
- Sashes that need overhauling
- Damaged stone surrounds
- Planning or listed building consent (your local planning authority decides)
Not sure which it is? You can phone 0345 464 0079 or send us an email and we’ll tell you honestly.
Surfaces we seal
- Period & listed homes
- Timber door frames
- Tenement windows
- Brick reveals
- Stone surrounds
- Sash and case windows