Kent · England
Sand mastic for sash & case windows in Betsham, Kent
Sand mastic across Betsham and nearby, with old sealant always removed completely.
- Mastic that needs renewing before redecorating
- Mastic dropping out of the joint
- Draughty sash windows at the surround
Signs you need sand mastic in Betsham
Sand mastic slowly weathers. It hardens, cracks and starts to come away from the frame or the masonry.
Common reasons people contact us are:
- Window mastic to renew ahead of painting
- Old sand mastic that has cracked, crumbled or fallen out
- Draughty sash windows at the surround
- Gaps between timber frames and stone or brick
For landlords with property near Longfield station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Questions to ask before booking
- Is the old sealant removed completely?
- How long the guarantee is
- What insurance they hold
- Is VAT in the price?
Sand mastic in Betsham, done properly
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 and built up by hand. On period homes, it looks right where silicone wouldn’t. If you are dealing with gaps where the frame meets the masonry and crumbling sand mastic round a window, we can put it right, on brick reveals, period & listed homes and tenement windows alike.
In a village or hamlet like Betsham, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these don’t always suit modern silicone, so the sealant has to be chosen to suit the building.
We stand behind the work with a 12-month guarantee, so you’re covered after we have gone.
- Location
- Betsham (DA13)
- Wider area
- Kent
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
How the visit works
We bring everything the job needs with us, so there’s nothing for you to buy. After a quick look at the joints together, we protect the area and start. Most jobs take anything from a few hours to a full day, depending on how many windows. Somewhere as small as Betsham, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First, we look at the surrounds with you and agree what needs doing.
- Old, loose mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic isn’t too thick.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The mastic is finished to sit tidily against the stone or brick.
Preparing for the visit
- Let us know if you’ve seen damp or leaks
- Plan for the work area to be out of bounds to pets and children
- On commercial sites, let us know about site rules
Get a quote
Getting a quote is simple: let us know what needs doing and where, and roughly how big it is. A few photos by email make the job easier to understand, and we’ll take it from there.
Advice
When something else is needed
We will not take on work that will not last, so these are the limits:
- Decayed frames that need repair
- Sashes that need overhauling
- Masonry that needs repairing
If you’re not sure, just phone 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Where we work in Betsham
- Brick reveals
- Timber door frames
- Tenement windows
- Sash and case windows
- Stone surrounds
- Period & listed homes
Can I do it myself?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
Common questions in Betsham
Do you cover Betsham for sand mastic?
Yes, Betsham is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or drop us an email with a few details of the job.
Do you cover smaller places like Betsham?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Do you work for landlords and businesses?
Yes. We work in homes, commercial premises and hotels.
Is it possible to take out silicone and use sand mastic instead?
Yes. We remove the silicone and clean the joint, then point it with sand mastic.
Is it OK to seal over old sealant?
No. Fresh sealant does not stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Is there any odour?
Possibly a little. Any smell clears as the sealant cures.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Can tenants book the work?
Of course. Check with your landlord; we can send the quote to them too.
Windows and doors in Betsham
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Cobham College (about 4.4 miles south-east) nearby, there’s older building stock in the area around Betsham as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you look after a building such as Sedley's Church of England Voluntary Aided Primary School, the mastic around its windows and doors needs looking after like any other building’s. For an older house near a landmark such as Church of St Nicholas, the joint between an old wall and a newer frame is normally the first place rain gets in.
Betsham is about 2 miles south-west of Northfleet, in Kent. We provide sand mastic to homes and businesses in Betsham and nearby. Betsham is one of 922 towns and villages in Kent where we work for sand mastic. We also work in London, about 18 miles from Betsham.
Work in DA13 is quoted and booked the same way as anywhere else. Streets in the area include Station Road, Crayburne and Park Corner Road, all of which we cover. Main roads around Betsham include the B262. Neighbouring places we cover for sand mastic include Hook Green (1 mile south-east), Southfleet (1 mile south-east), Springhead (1 mile north-east), Ebbsfleet Valley (1 mile north) and Northfleet Green (1 mile east). Larger places within reach include Maidstone (14 miles south-east), Dartford (4 miles north-west), Sevenoaks (11 miles south-west), Gravesend (3 miles east), Tonbridge (15 miles south) and Swanley (6 miles west).
What’s near Betsham
Around Betsham, our work takes us to homes and buildings near Beacon Wood Country Park, The Ebbsfleet Academy and The Ship Inn. For rail, the closest station is Longfield station, roughly 1.7 miles south of the centre. Other landmarks nearby include Darent Valley Hospital (2.4 miles north-west) and Stone Castle (2.1 miles north-west). Not far away are Chafford Gorges Nature Park and Sawyers Lake.
Surface by surface
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair, so check who is responsible first.
Timber door frames
Door frames get knocked and soaked, so their mastic can fail sooner. It’s renewed by hand.
What affects the quote in Betsham
The price is agreed before any work begins. It takes into account:
- Mould in or behind the old joints
- The number of rooms or windows
- Which sealant suits the joint
- How much there is to do
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we’ll go through it with you.
What we need to know
Photos by email are helpful but not essential. Try to tell us:
- How we’d reach the joints
- Where the property is
- Pictures of the joints, sent by email
- Whether it has been sealed before
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we’ll talk you through the work.
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Make sure water runs off the sill
- Take care around the mastic when scraping paint
- Do not paint over the new mastic
- Look over the window mastic once a year
Make sure water drains away from the window surround. Water sitting against the mastic shortens its life.
An open joint round the box lets weather through. Left, the gap tends to get bigger.