Buckinghamshire · England
Sand mastic for sash & case windows in Gerrards Cross, Buckinghamshire
Sand mastic for Gerrards Cross, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Mastic worn away on windows facing the weather
- Draughty sash windows at the surround
- Mastic round period door frames that has failed
Sand mastic in Gerrards Cross
Sand mastic does not last for ever and gaps open up round the frame. Renewing it closes the gap so the surround looks right again. If you are dealing with tired mastic found when preparing windows for paint and old sand mastic that has cracked, crumbled or fallen out, we can help, on timber door frames, stone surrounds and brick reveals alike.
Houses in smaller places like Gerrards Cross can stand more in the open than those in a built-up town, so exposed windows and doors face the weather head on. The mastic around frames on those walls tends to age faster.
The work is covered for a year after we finish. If there’s a problem with it, please call 0345 464 0079 or drop us an email.
- Location
- Gerrards Cross (SL9)
- Region
- Buckinghamshire
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What affects the cost of sand mastic
We do not publish a price list, because no two jobs are the same. What we look at:
- How many rooms, windows or areas are involved
- Any working-time requirements on site
- Whether old sealant or filler has to be cut out
- Any mould that needs treating
Combining jobs into one visit is normally more efficient than separate visits, so tell us about everything that needs sealing. You’ll get one clear quote for the whole job.
What to tell us for a quote
To make quoting easier, please include:
- Where the job is, and your postcode
- Roughly how big the job is
- Photos by email, if that’s easy
- If it’s domestic, commercial or a hotel
Want a quote for sand mastic? Please call 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.
Places near Gerrards Cross
Also in Gerrards Cross
What sand mastic looks like in Gerrards Cross
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 landlords with property near Gerrards Cross station, cracked sand mastic around sash windows lets in the draughts tenants complain about. For site and facilities teams at buildings such as The Gerrards Cross CofE School, the mastic around its windows and doors needs looking after like any other building’s.
Gerrards Cross is about 5 miles north-east of Slough, in Buckinghamshire. Homes, rented property, offices and hotels in Gerrards Cross is covered for sand mastic, old or new, large or small. The work is guaranteed for a year. Our Buckinghamshire coverage runs to 263 places, and Gerrards Cross is one of them. Our Reading page covers work nearby (20 miles or so).
Jobs for sand mastic in SL9 is quoted and booked the same way as anywhere else. Streets in the area include Station Road, East Common and Oxford Road. Gerrards Cross is on the A40 and A413, which makes it straightforward to reach with everything needed for sand mastic. Other places close to Gerrards Cross include Tatling End (1 mile south-east), Fulmer (1 mile south), Hedgerley Green (2 miles west), Higher Denham (2 miles east) and Baker's Wood (2 miles east). We also work in nearby towns such as High Wycombe (9 miles west), Chesham (9 miles north), Marlow (9 miles west), Amersham (7 miles north), Beaconsfield (4 miles north-west) and Princes Risborough (15 miles north-west).
Around Gerrards Cross
Around Gerrards Cross, our work takes us to homes and buildings near St Mary's School, The Chalfonts Community College and Bulstrode Park. There’s a railway station in Gerrards Cross itself: Gerrards Cross station. A little further out are Chiltern Open Air Museum (3.8 miles north) and Chalfonts and Gerrards Cross Hospital (1.7 miles north). The countryside around Gerrards Cross includes Horse Shoe Bay and Church Wood.
What happens on the day
There’s no need to move everything out before we come, just the space around the work. We protect the rest, and the job takes a few hours per window, depending on the condition of the joints for a typical job. In a smaller place like Gerrards Cross, parking is seldom the issue; lanes, gates and long drives are worth mentioning. 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.
- 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.
Before we arrive
- On commercial sites, let us know about site rules
- Mention any leaks or damp you’ve noticed
- Mention any parking rules near the property
Ask for a quote
Asking for a quote is easy: let us know what needs doing and where and its rough size. A few photos by email make the job easier to understand, and we will take it from there.
Read more
Why deal with it now?
An open joint round the frame lets weather in. Water can get to the frame and the masonry, so dealing with it now protects both. Around Gerrards Cross, water from a failed joint in an older home can soak into timber and plaster, which is far harder to put right than the sealant itself.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Call for a quick quote and we will explain what it covers.
Why choose Mr Mastic in Gerrards Cross
- Trusted Arbo and Everbuild sealants
- Experience in homes, commercial sites and hotels
- Every job guaranteed for a year
- Neat joints and a tidy finish
Take a look at how sealant jobs are priced or what customers say.
Gerrards Cross questions
Do you work for landlords with property near Gerrards Cross station?
Yes. We work for landlords and agents as well as homeowners, and several properties can go on one quote. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear quote.
Is Gerrards Cross within the area you cover?
Yes, we do. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
How long does sand mastic take to harden?
It forms a skin fairly soon and it hardens fully over a longer time. The weather and joint depth both affect it.
Do you offer different sealant colours?
Usually, yes. Sealants come in white, clear, grey and other colours for many products, and we agree the colour with you before any work starts.
Where do you work from?
We work from Crawley. Our applicators cover Gerrards Cross.
What’s sand mastic made of?
A traditional pointing material made from sand and a linseed-oil-based binder, used between timber frames and stone or brick.
Do you have insurance?
Yes. Mr Mastic is fully insured.
Is it messy?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
When something else is needed
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- Cracked or broken glass
- Rotten sashes, sills or window boxes (a joiner’s job)
- Sashes that rattle, stick or won’t open
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we’ll tell you honestly.
Where we work in Gerrards Cross
- Stone surrounds
- Brick reveals
- Tenement windows
- Sash and case windows
- Period & listed homes
- Timber door frames
Do you need sand mastic in Gerrards Cross?
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.
Signs it’s time to call us include:
- Window mastic to renew ahead of painting
- A silicone bead on a sash window that spoils the look
- Mastic dropping out of the joint
- Cement or filler used on old window joints that has cracked
In the older streets around St James Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
What to look for in a quote
- Who turns up on the day
- What product goes in the joint
- What happens if they find a problem under the old sealant
- How long to leave it before use
Keeping the joints in good condition
After the cure time, these simple habits help:
- Have rotten timber repaired before new mastic goes in
- Don’t run silicone over sand mastic
- Inspect the joints round the windows every year or so
- Leave the new mastic unpainted
Keep gutters and sills clear so water runs away from the surround. Water sitting against the mastic shortens its life.
Sound mastic protects the frame. Failed mastic lets water reach the timber, which can lead to rot.
How the job changes by surface
Sash and case windows
Most of our sand mastic work is on sash windows. Each joint round the box is raked out and renewed.
Timber door frames
A neat sand mastic joint round a front door suits a period home.