Slough · England
Sand mastic for sash & case windows in Horton, Slough
We cover Horton for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old material cut out, joints cleaned and sealed neatly.
- Wind and rain getting in round a sash window
- Mastic worn away on windows facing the weather
- Patchy fillers round a sash window
When to call us in Horton
Scraping and sanding before painting can loosen old mastic. Many people find it crumbling when they prepare the windows, which is a good time to renew it.
Look out for these signs:
- Wind and rain getting in round a sash window
- Cracked mastic round a front door frame
- Crumbling sand mastic round a window
- Gaps where the frame meets the masonry
If you let a flat or house near Sunnymeads station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Before booking anyone
- Which colour the sealant will be
- Are they insured?
- How hidden problems are handled
- Whether all the old sealant comes out first
Sand mastic in Horton
We renew sand mastic around sash windows and doors set in stone or brick. Out comes the old, loose mastic, the joint is prepared and new mastic is shaped by hand. We are often asked to deal with mastic dropping out of the joint and a silicone bead on a sash window that spoils the look, on timber door frames, stone surrounds and period & listed homes.
Somewhere as small as Horton, older homes often have timber frames set in stone or brickwork. Not every older frame suits a modern silicone bead, so the sealant has to be chosen to suit the building.
You’re covered for a year from the day we finish. If anything is not right with it, phone 0345 464 0079 or drop us an email.
- Where
- Horton (SL3, TW19)
- Wider area
- Slough
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
If you’ve already had a go yourself, that’s fine. We cut it out and start again, so tell us about it when you ask for a quote.
Horton: your questions answered
I let a flat near Sunnymeads station. Can you help?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or send us an email and tell us about the property, and we’ll give you a clear price.
Do you cover Horton for sand mastic?
Yes. Our work covers London and the South East, and Horton is part of that. Just ring 0345 464 0079 or email us with a few details of the job.
Will it make a mess?
Tidy work is part of the job. We protect what’s around the joints, and the area is left clean when we finish.
How do I get a quote for sand mastic in Horton?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote.
When will the new mastic be hard?
The surface skins quite quickly and it hardens fully over a longer time. The weather and joint depth both affect it.
What sealant do you use?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We will tell you what we are using and why.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned before resealing.
Can you replace silicone on a period window with sand mastic?
Often, yes. Once the silicone is out and the joint prepared, sand mastic is applied by hand.
Work for landlords, hotels and businesses
Hotels need rooms back in use, so the work can be planned room by room. We have worked in hotels as well as homes and businesses.
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
Leave it or put it right?
New mastic over crumbling mastic will not hold. We remove the loose material first so the new work lasts. Where a wall is exposed, as many are in small places like Horton, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Combining jobs into one visit is generally more efficient than separate visits, so it’s worth mentioning everything you’d like done. We’ll give you a clear quote for the lot.
Why Horton clients choose us
- One-year guarantee on every job
- Anti-fungal sanitary silicone in wet areas
- ARBOMaster approved applicator
- 20+ years of sealant experience
Read what affects the cost and what customers say.
How the job changes by surface
Tenement and terrace windows
Tenements and terraces often have many sash windows with ageing mastic. We work on single windows or whole elevations.
Sash and case windows
Sash windows are where we do most sand mastic work. Each joint round the box is raked out and renewed.
Windows and doors in Horton
Historic houses like Frogmore House (about 2.5 miles west) are a reminder that the area around Horton has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you live in an older home near Church of St Michael, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Schools such as Colnbrook Church of England Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s.
Horton is about 3 miles north of Egham, in Slough. From the centre of Horton to the outskirts, sand mastic is available for homes and businesses alike. Our area takes in 31 places across Slough. London is on our list too, around 19 miles away.
Jobs for sand mastic in SL3 and TW19 works the same way as everywhere else we cover. You will find streets such as Stanwell Road, Bells Lane and Foundry Lane, and we cover them all. If you are just outside Horton, we cover Brands Hill (1 mile north), Colnbrook (1 mile north-east), Sunnymeads (1 mile west), Poyle (1 mile north-east) and Wraysbury (1 mile south-west). Further out, we also cover Slough (4 miles north-west), Cippenham (5 miles north-west), Chalvey (4 miles north-west), Britwell (6 miles north-west), Upton (3 miles north-west) and Burnham (7 miles north-west).
Around Horton
In Horton, that means homes and buildings near The Five Bells Public House, Langley Grammar School and Arthur Jacob Nature Reserve and the streets around them. Horton’s nearest station is Sunnymeads station, about 1 mile west of the centre. A little further out are Upton Hospital (3.3 miles north-west) and Windsor Castle (3 miles west). Not far away are Staines Reservoirs.
The process
Most of a good job is in the preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. In total, it normally takes a few hours per window, depending on the condition of the joints. In a small place like Horton, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic isn’t too thick.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Preparing for the visit
- Let us know if you’ve seen damp or leaks
- Mention if the joints have been sealed before
- Tell us about access, such as stairs, a lift or high-level joints
Getting a quote
Asking for a quote is easy: let us know what needs doing and where, and roughly how big it is. Photos by email help us understand the job, and we will take it from there.
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What affects the quote in Horton
You will get a clear quote before we start. It takes into account:
- How many rooms, windows or areas are involved
- Whether there’s mould to deal with
- The old material and how stubborn it is
- How much there is to do
Leaving a failed joint generally makes the job bigger, not smaller, as water and mould keep getting in. If you are not sure whether it needs doing, phone 0345 464 0079 or send us an email and we’ll give you an honest view and a quote.
What we need to know
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- What the problem is, such as mould, gaps, leaks or cracking
- Whether it has been sealed before
- Photos by email, if that’s easy
- If it’s domestic, commercial or a hotel
We quote each job on its own. Just call 0345 464 0079 or send us an email with the details, and photos are welcome.