East Sussex · England
Blackboys Sand Mastic
Window and door surrounds in Blackboys need attention? We remove the old material, prepare the joints and seal them properly.
- Tired mastic found when preparing windows for paint
- Wind and rain getting in round a sash window
- Open joints round the window box
How the job changes by surface
Brick reveals
Loose mastic comes out and deep gaps are packed before the new mastic goes in.
Sash and case windows
A sash window’s box frame sits in the masonry opening. Sand mastic seals the joint round it.
How we handle sand mastic in Blackboys
Burnt sand mastic is a traditional material that sits naturally against stone and brick. It’s a good fit for period properties where a modern sealant bead would stand out. We are often asked to deal with silicone on a period window that looks wrong and crumbling sand mastic round a window, on tenement windows, sash and case windows and timber door frames.
In a village or hamlet like Blackboys, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these do not always suit modern silicone, so the sealant has to be chosen to suit the building.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Where
- Blackboys (TN22)
- Wider area
- East Sussex
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What we cannot put right
Sealant is not the answer to every problem, and we’d rather say so up front. It won’t solve:
- Crumbling stone or brickwork round the window
- Putty and glazing repairs
- Timber that has rotted
If you’re not sure, just call 0345 464 0079 or email us and we’ll give you a straight answer.
Joints and surfaces we work on
- Period & listed homes
- Tenement windows
- Timber door frames
- Brick reveals
- Stone surrounds
- Sash and case windows
Common problems we fix in Blackboys
Timber swells and shrinks with the weather. The movement cracks the mastic little by little.
Any of these means the joints need attention:
- Open joints round the window box
- Old sand mastic that has cracked, crumbled or fallen out
- Gaps round a timber door in stone or brick
- Silicone on a period window that looks wrong
For landlords with property near Buxted station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Before booking anyone
- What happens if the job turns out different
- Whether all the old sealant comes out first
- Who does the work, and how experienced they are
- What guarantee comes with the work
Common questions in Blackboys
I let a flat near Buxted station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just ring 0345 464 0079 or email us with the address and what needs doing, and we will give you a clear price.
Is Blackboys in your area for sand mastic?
Yes. Our work covers London and the South East, and Blackboys is part of that. You can call 0345 464 0079 or drop us an email and let us know what needs doing.
What exactly is sand mastic?
It’s the traditional filler for the joint round timber windows and doors. It combines sand with a linseed-oil-based binder.
Can you do several jobs on one visit?
Yes. Tell us about everything you’d like done.
Is there any odour?
Sometimes, a little. Any smell clears as the sealant cures.
Should I use sand mastic or silicone?
For period timber windows in stone or brick, sand mastic is often the better fit. On modern frames, we’d normally use a flexible sealant.
Do you remove the old sealant?
Yes, always, and completely. New sealant will not bond properly to old, so the joint is cleaned back first.
Are you ARBOMaster approved?
Yes. We’re approved under the ARBOMaster scheme.
Quotes for sand mastic in Blackboys
Call for a quick quote. What matters most is:
- How many areas need sealing
- Whether the work is at height
- Mould in or behind the old joints
- The size of the job
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part, and we’ll explain the quote if you ask.
What we need to know
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- The problem you’ve noticed
- How many joints, rooms or windows are involved
- Whether it has been sealed before
- The type of property
We quote each job on its own. Simply call 0345 464 0079 or send us an email and describe the job.
Also near Blackboys
Other services in Blackboys
What happens on the day
Most of a good job is in the preparation, and we do not rush it. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours per window, depending on the condition of the joints. Somewhere as small as Blackboys, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We check the window surrounds and agree which joints need renewing.
- We rake out the old mastic and clean the joint.
- 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.
- We dress the surface so it sits neatly against the masonry.
Preparing for the visit
- Mention any sign-in or site rules at work premises
- Keep pets and children clear of the area while we work
- Mention if the joints have been sealed before
Get a quote
Asking for a quote is easy: let us know the job and the location. Photos by email help us understand the job, and we’ll take it from there.
Related advice
Windows and doors in Blackboys
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For site and facilities teams at buildings such as Blackboys Church of England Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
Blackboys is about 3 miles east of Uckfield, in East Sussex. Blackboys gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Our East Sussex coverage runs to 289 places, Blackboys among them. For nearby work, see our Brighton page, about 16 miles away.
Jobs for sand mastic in TN22 is quoted and booked the same way as anywhere else. If you need sand mastic at a property on High Street, Mount Pleasant and Gun Road or anywhere close by, our applicators can take on the job. Blackboys is on the B2102, which makes it straightforward to reach. Other places close to Blackboys include Etchingwood (1 mile north-west), Framfield (1 mile west), Potter's Green (2 miles north-west), Buxted (2 miles north-west) and Hadlow Down (2 miles north). Larger places within reach include Eastbourne (13 miles south-east), Bexhill-on-Sea (15 miles south-east), Seaford (13 miles south), Lewes (9 miles south-west), Hailsham (8 miles south-east) and Crowborough (6 miles north).
Around Blackboys
In Blackboys, that means homes and buildings near Blackboys Inn and Passingworth Park. For rail, the closest station is Buxted station, about 2.3 miles north-west. A little further out are Uckfield Community Hospital (2.6 miles west) and Sussex Farm Museum (3.9 miles south-east). For a walk, there’s Selwyns Wood.
DIY sealant or a professional job?
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
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.
Looking after it afterwards
So the new joints stay in good condition:
- Renew mastic before redecorating the windows
- Keep modern sealant off the mastic
- Make sure water runs off the sill
- Check the mastic when you check the paintwork
When preparing windows for paint, take care around the mastic. It can be damaged by heavy scraping.
Crumbling mastic lets rain into the joint. It can soak into the frame and the surrounding masonry, so renewing it early is worth it.