Buckinghamshire · England
Sand mastic for sash & case windows in Fern, Buckinghamshire
We cover Fern 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.
- Mastic that needs renewing before redecorating
- Old sand mastic that has cracked, crumbled or fallen out
- Silicone on a period window that looks wrong
How it works
Before we leave, we go over the finished joints with you. The work normally takes a few hours per window, depending on the condition of the joints, depending on the size of the job. For a village or hamlet like Fern, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- Each surround is checked first.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic is not too thick.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Getting ready for the visit
- Let us know about parking restrictions
- Plan for the work area to be out of bounds to pets and children
- Mention any sign-in or site rules at work premises
Get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job. Whenever you’re ready, call 0345 464 0079 or send us an email.
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About our sand mastic in Fern
Sand mastic skins over fairly quickly, but it takes longer to harden fully. Traditional guidance is not to paint over it, so ask us before you decorate. Typical jobs include gaps round a timber door in stone or brick and gaps between timber frames and stone or brick, on timber door frames, stone surrounds and brick reveals.
Outdoor sealant needs dry, clean surfaces, so work on frames around Fern is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
Our work is backed for twelve months.
- Place
- Fern (SL7)
- Region
- Buckinghamshire
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Landlord and commercial work in Fern
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can be quoted together.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we will give you a quote.
Should I try it myself first?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
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.
Do you need sand mastic in Fern?
Most of it is simply age. Sand mastic is a maintenance item like any pointing and how long it lasts depends on the weather it faces.
These are the problems we are asked about most:
- Old sand mastic that has cracked, crumbled or fallen out
- Old cement repairs round a window that have failed
- Modern sealant on a period surround
- Wind and rain getting in round a sash window
For landlords with property near Bourne End station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
What to look for in a quote
- What the quote includes, VAT included or not
- What preparation is included
- What guarantee comes with the work
- Who turns up on the day
How to look after the new joints
To keep the joints looking good and working properly:
- Keep modern sealant off the mastic
- Sort the mastic before the decorators arrive
- Ask us before painting near the mastic
- Find out about consent before window work on a listed home
Make sure water drains away from the window surround. Water sitting against the mastic shortens its life.
Once mastic starts to crumble, rain gets in. That water can reach the timber frame and the wall so early renewal protects both.
Windows and doors in Fern
With historic houses such as Cliveden (about 2.7 miles south-east) nearby, there’s older building stock in the area around Fern as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Managing a site like Little Marlow CofE School? Then larger buildings have plenty of frames, and the mastic around each one ages. For an older house near a landmark such as Church of St John the Baptist, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Fern is about 2 miles north-east of Marlow, in Buckinghamshire. If you need sand mastic in Fern, it’s easy to get a quote: please phone 0345 464 0079 or send us an email. We are based in Crawley and cover Buckinghamshire, Fern included. Fern is one of 263 places in Buckinghamshire where we work. You can also see our page for Reading, roughly 14 miles from Fern.
We work across the SL7 postcode area for sand mastic and the streets around it. Close by, we work in Coldmoorholme (1 mile south-east), Little Marlow (1 mile south-west), Well End (1 mile south-east), Bourne End (1 mile south-east) and Flackwell Heath (1 mile north-east). Within a short drive, we also cover High Wycombe (3 miles north), Chesham (10 miles north-east), Amersham (8 miles north-east), Beaconsfield (4 miles east), Chalfont St Peter (8 miles east) and Southcourt (15 miles north).
Local landmarks in Fern
Locally, jobs take us to homes and businesses close to Bourne End Academy and The Black Lion pub and the streets around them. For rail, the closest station is Bourne End station, about 1.1 miles south-east. A little further out are High Wycombe Castle (3.1 miles north) and Chiltern Sound Phonograph Museum (2.3 miles south-west). The countryside around Fern includes Warren Nature Reserve.
What affects the cost of sand mastic
Call for a quick quote. What matters most is:
- Any working-time requirements on site
- The size of the job
- The product the joint needs
- How many areas need sealing
What you pay reflects the work, not guesswork. That is why we ask a few questions first and give you a clear quote before we start.
Asking for a quote
To help us quote quickly, let us know:
- The address or postcode of the job
- Whether it’s a home or a business
- Photos by email, if that is easy
- Roughly how big the job is
Call for a quick quote, or email us if that is easier. Describe what needs sealing and we’ll explain what’s involved before giving you a price.
Common questions in Fern
Do you work for landlords with property near Bourne End station?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before work begins.
Do you cover Fern for sand mastic?
Yes. Our work covers London and the South East, and Fern is part of that. Just ring 0345 464 0079 or email us with a few details of the job, and we will give you a clear quote.
Do you have insurance?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
Can I add another job to the visit?
Of course. Doing several areas at once is usually more efficient.
Where is Mr Mastic based?
Our base is Crawley. We work across South East England, London and Scotland.
How long does the job take?
That depends on how much there is to do, but most jobs take a few hours for a single window, longer for several. We’ll give you a better idea when we quote.
What do you put in the joint?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
What is sand mastic?
Sand mastic is a traditional material for pointing round windows and doors. It’s made with sand and a linseed-oil-based binder.
When something else is needed
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- Damaged stone surrounds
- Rotten sashes, sills or window boxes (a joiner’s job)
- Sashes that rattle, stick or will not open
If you’re not sure, just call 0345 464 0079 or send us an email and we’ll give you a straight answer before booking.
Where we work in Fern
- Brick reveals
- Stone surrounds
- Tenement windows
- Sash and case windows
- Timber door frames
- Period & listed homes