Kent · England
Waltham Sand Mastic
Specialist sand mastic for Waltham: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Failed mastic on an exposed elevation
- Old sand mastic that has cracked, crumbled or fallen out
- A silicone bead on a sash window that spoils the look
Should I try it myself first?
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
About our sand mastic in Waltham
Sand mastic has long been used to fill the joint between timber frames and masonry. 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. If you’re dealing with open joints round the window box and mastic dropping out of the joint, we can put it right.
Outdoor sealant needs dry, clean surfaces, so work on frames around Waltham is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
We stand behind the work with a 12-month guarantee.
- Location
- Waltham (CT4)
- Wider area
- Kent
- Guarantee
- A year, on every job
- Quotes
- A clear price before work begins
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Honest limits
Some problems need a builder, plumber or other trade rather than us:
- Damaged stone surrounds
- Rotten sashes, sills or window boxes (a joiner’s job)
- Sashes that rattle, stick or will not open
If you are not sure, just call 0345 464 0079 or email us and we’ll give you a straight answer before booking.
What we seal
- Tenement windows
- Timber door frames
- Brick reveals
- Period & listed homes
- Stone surrounds
- Sash and case windows
Nearby places to Waltham
Also in Waltham
For landlords and businesses
Housing providers, facilities teams and property managers book us too in Waltham and across Kent. Several sites can be quoted together.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Windows and doors in Waltham
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.
For landlords with property near Chilham station, cracked sand mastic around sash windows lets in the draughts tenants complain about. If you live in an older home near Church of St Bartholomew, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Waltham is about 6 miles south-west of Canterbury, in Kent. Jobs in Waltham get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Our Kent coverage runs to 922 places, Waltham among them. We also work in Chelmsford, about 44 miles from Waltham.
All of CT4 is covered for sand mastic. Whether your property is on Church Lane, Richdore Road and Kake Street or a nearby road, we can help. Nearby, we also carry out sand mastic in Stelling Minnis (2 miles east), Bossingham (2 miles east), Stowting Common (4 miles south), Stowting (4 miles south) and Rhodes Minnis (4 miles south-east). Larger places within reach include Ashford (8 miles south-west), Canterbury (6 miles north-east), Dover (13 miles east), Folkestone (10 miles south-east), Whitstable (11 miles north) and Faversham (10 miles north-west).
What’s near Waltham
Around Waltham, our work takes us to homes and buildings near Compasses Inn. The nearest railway station is Chilham station, roughly 3.7 miles north-west. Nearby you will also find Chilham Castle (4.1 miles north-west) and Kent and Canterbury Hospital (5.5 miles north-east).
What we do, step by step
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. Typically it takes a few hours for a single window, longer for several. Somewhere like Waltham needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
Preparing for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us if parking is tricky
- Mention if the joints have been sealed before
Getting a quote
Call for a quick quote, or email us if that is easier. Tell us about the joints that need doing and we’ll talk you through the work.
Related advice
Looking after it afterwards
After the cure time, these simple habits help:
- Clear gutters so water does not pour onto the windows
- Ask us before painting near the mastic
- Keep modern sealant off the mastic
- Renew mastic before redecorating the windows
Do not touch or press the mastic while it hardens. It skins over quickly, but takes longer to harden fully.
It’s best to renew mastic before painting the windows. Paint over cracked mastic only covers it up.
Different surfaces, different methods
Brick reveals
Gaps between frame and brick let in rain and draughts. Renewing the mastic closes it.
Stone surrounds
Stone openings are rarely perfectly straight, so the joint varies in width. Sand mastic is shaped by hand to suit.
What affects the quote in Waltham
Some jobs are bigger than they look, and some smaller. The main factors:
- How easy the joints are to reach
- The amount of work
- Working hours on commercial sites
- The type of sealant required
The cost reflects the work involved, not guesswork. That is why we ask about the job first and agree the price before starting.
What to tell us for a quote
Photos by email are helpful but not essential. Try to tell us:
- The rough size of the job
- Where the property is
- The problem you’ve noticed
- How we’d reach the joints
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. Whenever you are ready, call 0345 464 0079 or email us.
Waltham questions
Do you cover smaller places like Waltham?
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.
Do you cover Waltham for sand mastic?
Yes. Our work covers London and the South East, and Waltham is part of that. Just phone 0345 464 0079 or send us an email with a few details of the job.
What do you put in the joint?
Each joint gets the product that suits it. Movement, water and weather all affect the choice, and we will explain our choice.
Are you an approved applicator?
Yes. We are an ARBOMaster approved applicator, which is run for the Arbo sealant brand.
Can you replace silicone on a period window with sand mastic?
Usually, yes. Once the silicone is out and the joint prepared we point it with sand mastic.
Should I check with the council before work on a listed or conservation-area home?
Check with your local planning authority. They’ll tell you if consent is needed.
Is it possible to paint over sand mastic?
The usual advice is to leave sand mastic unpainted. Ask us before you decorate around it and we’ll advise.
Can I choose the sealant colour?
Normally, yes. White, clear and grey are common, and other colours are available, and we’ll agree it with you first.