Slough · England
Fulmer Sand Mastic
Problem with your window and door surrounds in Fulmer? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Mastic worn away on windows facing the weather
- Tired mastic found when preparing windows for paint
- Crumbling sand mastic round a window
Can I do it myself?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
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.
How we handle sand mastic in Fulmer
On many period windows, sand mastic looks right and suits the building. Newer frames normally get a flexible sealant instead, and we will talk through which suits your home. We work on brick reveals, period & listed homes and sash and case windows, and the jobs we see most are silicone on a period window that looks wrong and draughty sash windows at the surround.
Somewhere as small as Fulmer, 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.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Location
- Fulmer (SL3)
- Wider area
- Slough
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Signs you need sand mastic in Fulmer
Scraping and sanding before painting can loosen old mastic. It’s often found when windows are being prepared for paint, which is a good time to renew it.
The most common problems we see are:
- Patchy fillers round a sash window
- Weathered mastic on the most exposed windows
- Tired mastic found when preparing windows for paint
- Silicone on a period window that looks wrong
Homes close to Church of St James include some older properties, and the joint between an old wall and a newer frame is normally the first place rain gets in.
Comparing quotes
- Is VAT in the price?
- Whether they’re fully insured
- When the joint can take water or movement
- Whether you can choose the colour
Also in Fulmer
Honest limits
In fairness, some problems need a different trade:
- Whether work needs listed building consent
- Crumbling stone or brickwork round the window
- Sashes that rattle, stick or will not open
If in doubt, ring 0345 464 0079 or email us and we will say what we think.
Surfaces we seal
- Sash and case windows
- Stone surrounds
- Brick reveals
- Timber door frames
- Tenement windows
- Period & listed homes
How it works
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The work itself takes anything from a few hours to a full day, depending on how many windows. For a village or hamlet like Fulmer, 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 agree which joints need doing.
- We remove the old, loose mastic.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
Getting ready for the visit
- Tell us if parking is tricky
- Clear the area around the work
- Where the joints are inside, avoid wetting them before we arrive
How to get a quote
For a quote, phone 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. You will have a clear quote before work begins.
Related advice
Fulmer questions
Will you come out to Fulmer?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Is Fulmer in your area for sand mastic?
Yes. Our work covers London and the South East, and Fulmer is part of that. You can ring 0345 464 0079 or drop us an email and let us know what needs doing, and we will send you a clear quote.
Do you guarantee sand mastic work?
Our 12-month guarantee covers every job.
Do you work for landlords and businesses?
Yes, regularly. We can quote for several properties at once.
Where is Mr Mastic based?
Our base is Crawley, with over 20 years’ experience. Our area covers South East England, London and Scotland.
Will there be a smell?
There can be a smell while the sealant cures. Opening a window helps.
Which products do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice, and we will explain our choice.
What exactly is sand mastic?
Sand plus a binder based on linseed oil. It’s applied by hand and finished to sit neatly against the masonry.
What happens if it’s left?
An open joint round the frame lets weather in. Left, water can reach the timber and the wall so renewing it early protects the window. In a small place like Fulmer, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
The cost reflects the work involved, not a rough estimate. That is why we ask about the job first and agree the price before starting.
Why book with us
- Homes, businesses and hotels
- Anti-fungal sanitary silicone in wet areas
- A 12-month guarantee on all work
- Full insurance on every job
Read how sealant jobs are priced and customer reviews.
Aftercare tips
So the new joints stay in good condition:
- Don’t run silicone over sand mastic
- Avoid heavy scraping on the mastic joint
- Look over the window mastic once a year
- Keep sills and gutters clear so water drains away
Leave the new mastic unpainted, as traditional guidance advises. Ask us before any decorating around it.
Gaps round a sash box let in draughts and rain. Left, the gap tends to get bigger as more mastic falls out.
How we quote for sand mastic
Every job gets its own quote. These are the things that affect it:
- Any mould that needs treating
- The product the joint needs
- Any working-time requirements on site
- How easy the joints are to reach
Leaving a failed joint normally makes the job bigger, not smaller. If you’re not sure whether it needs doing, phone 0345 464 0079 or send us an email for an honest opinion and a quote.
Helping us quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- Whether it has been sealed before
- What’s wrong with the joints now
- If it’s domestic, commercial or a hotel
- Where the job is, and your postcode
Asking for a quote is easy: let us know the job and the location and its rough size. Photos by email help us understand the job, and we will come back to you with a quote.
Windows and doors in Fulmer
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.
For site and facilities teams at buildings such as Fulmer Infant School, the mastic around its windows and doors needs looking after like any other building’s. Rented homes near Gerrards Cross station change hands often, and any sash windows need sound mastic to keep draughts and rain out.
Fulmer is about 4 miles north-east of Slough, in Slough. Every kind of property in Fulmer is covered for sand mastic, old or new, large or small. The work is guaranteed for a year. Our Slough coverage runs to 31 places, Fulmer among them. London is on our list too, about 20 miles from Fulmer.
Postcode districts we cover here for sand mastic: SL3. If you need sand mastic at a property on Fulmer Road, Alderbourne Lane and Hay Lane or a nearby road, we can help. Other places close to Fulmer include Tatling End (1 mile north-east), Wexham Street (1 mile south-west), Gerrards Cross (1 mile north), Stoke Poges (2 miles south-west) and Rush Green (2 miles east). Further out, we also cover Slough (4 miles south-west), Cippenham (5 miles south-west), Chalvey (4 miles south-west), Britwell (3 miles south-west), Langley (4 miles south) and Upton (4 miles south).
What’s near Fulmer
We work in homes and buildings around Bulstrode Park, The Black Horse Public House and Khalsa Secondary Academy. The closest station to Fulmer is Gerrards Cross station, about 1.9 miles north. Other landmarks nearby include British Airways Heritage Collection (3.5 miles south-east) and Wexham Park Hospital (2.2 miles south). Green spaces nearby include Horse Shoe Bay and Stoke Common.