West Sussex · England
Sand Mastic in Langley Green
We cover Langley Green 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.
- Gaps where the frame meets the masonry
- Weathered mastic on the most exposed windows
- Modern sealant on a period surround
Sand mastic in Langley Green
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s a mix of sand and a linseed-oil-based binder, applied by hand. On older homes, it suits the building far better than silicone. We are often asked to deal with mastic round period door frames that has failed and gaps where the frame meets the masonry, across brick reveals, stone surrounds and period & listed homes.
In a smaller place like Langley Green, some walls face open ground and catch the full force of the weather. The mastic around frames on those walls tends to age faster.
You get a 12-month guarantee, the same in Langley Green as everywhere else we work.
- Location
- Langley Green (RH11, RH10)
- Region
- West Sussex
- Guarantee
- 12 months on all our work
- Price
- A clear price before we start
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Aftercare tips
Once the sealant has cured, a few habits help it last:
- Don’t run silicone over sand mastic
- Inspect the joints round the windows every year or so
- Avoid heavy scraping on the mastic joint
- Keep sills and gutters clear so water drains away
Keep gutters and sills clear so water runs away from the surround. Water sitting against the mastic shortens its life.
An open joint round the box lets weather through. The longer it’s left, the more the joint opens as more mastic falls out.
Work for landlords, hotels and businesses
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can go on one quote.
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
DIY sealant or a professional job?
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.
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
What affects the cost of sand mastic
Jobs vary more than people expect. The main factors:
- Any mould that needs treating
- The number and length of the joints
- When we can work, for business premises
- The type of sealant required
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you’re unsure, call 0345 464 0079 or email us and we’ll give you an honest view and a quote.
What we need to know
To help us quote quickly, please include:
- How many joints, rooms or windows are involved
- What the problem is, such as mould, gaps, leaks or cracking
- A few photos by email, if you can
- If it’s domestic, commercial or a hotel
For a quick quote, get us on the phone, or email us if that is easier. Describe what needs sealing and we’ll explain what’s involved and give you a clear price.
What we cannot put right
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- Decisions on consent for listed homes
- Cracked or broken glass
- Sash cords, weights and draught-proofing of the sashes
Not sure which it is? You can call 0345 464 0079 or drop us an email and we’ll tell you honestly.
Surfaces we seal
- Sash and case windows
- Period & listed homes
- Stone surrounds
- Tenement windows
- Timber door frames
- Brick reveals
The process
At the end, we look at the finished work together and explain the cure time. The work normally takes anything from a few hours to a full day, depending on how many windows, depending on the amount of work. For a job in Langley Green, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- First we agree which joints need doing.
- We remove the old, loose mastic.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
Before we arrive
- Let us know about parking restrictions
- Let us know about stairs, lifts or work at height
- Keep children and pets away from the work area
Getting a quote
Want a quote for sand mastic? Please phone 0345 464 0079 or email us and tell us about the job. We will explain what we’d do and give you a clear quote before any work starts.
Read more
What the job involves on each surface
Sash and case windows
Sash windows are where we do most sand mastic work. Each joint round the box is raked out and renewed.
Period and listed homes
Many older homes were built with sand mastic round the windows. On listed buildings, check with your planning authority first.
Questions from Langley Green
Is Langley Green within the area you cover?
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.
Do older homes in Langley Green need their sealant replacing?
Often, yes: cracked, shrunken or mouldy sealant has done its job. The key is cutting all the old sealant out, as new sealant will not bond to it.
Should I try DIY first?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs.
What do you put in the joint?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we will tell you what we are using.
Do I need to be at home?
If the work is inside, we need someone to let us in. Once we have agreed the job, you do not need to watch us work.
Do you work for landlords and businesses?
Yes, often. We can quote for several properties at once.
Will the old sealant be removed?
Yes, always, and completely. New sealant will not bond properly to old, so the joint is cleaned back first.
Is it OK to seal over old sealant?
No, because it fails. The old sealant always comes out first, so the new joint bonds to clean surfaces.
Places near Langley Green
Other services in Langley Green
Langley Green homes and the weather
Crawley, which Langley Green is part of, is one of England’s post-war new towns. Many homes date from the post-war decades, and many will have had their original windows replaced. That mastic ages as well, and sills and frame heads are where leaks start. 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.
Letting a property close to Crawley station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about. Homes close to Voice of Deliverance Full Gospel Church of God include some older properties, and the joint between an old wall and a newer frame is usually the first place rain gets in. Managing a site like Langley Green Primary? Then the mastic around its windows and doors needs looking after like any other building’s.
Langley Green is about 1 mile north of Crawley, in West Sussex. From the centre of Langley Green to the outskirts, sand mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Langley Green is one of 371 places in West Sussex where we work for sand mastic.
All of RH11 and RH10 is within our area for sand mastic. You will find streets such as London Road, Cherry Lane and Dobson Road. If you’re just outside Langley Green, we cover West Green (1 mile south), Crawley (1 mile south), Three Bridges (2 miles south-east), Southgate (2 miles south) and Forge Wood (2 miles east). We also work in nearby towns such as Horsham (7 miles south-west), Haywards Heath (10 miles south-east), Burgess Hill (12 miles south), East Grinstead (8 miles east), Broadfield (3 miles south) and Billingshurst (14 miles south-west).
Around Langley Green
In Langley Green, that means homes and buildings near Dr Samuel Johnson pub, Central Sussex College and Hazelwick School. The closest station to Langley Green is Crawley station, roughly 1.4 miles south of the centre. Well-known places in the area include Crawley Museum (1 mile south) and Langley Green Hospital (less than half a mile south). Not far away are Tilgate Lake.