Greater London · England
Sand mastic for sash & case windows in Foots Cray, Greater London
Sand mastic in Foots Cray from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Gaps round a timber door in stone or brick
- Draughts and rain around sash boxes
- Mastic dropping out of the joint
Should I try it myself first?
If you’ve already had a go yourself, that is fine. We cut it out and start again, so just mention it when you contact us.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
About our sand mastic in Foots Cray
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 period homes, it looks right where silicone wouldn’t. If you’re dealing with cracked mastic round a front door frame and draughty sash windows at the surround, we can put it right, whatever the surface.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out, in Foots Cray as anywhere.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we will sort it.
- Location
- Foots Cray (DA14, BR5)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Places near Foots Cray
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When it isn’t the sealant
We’ll always be straight with you, so here’s what sealant cannot fix:
- Timber that has rotted
- Sashes that need overhauling
- Whether work needs listed building consent
If in doubt, ring 0345 464 0079 or email us and we will say what we think before booking.
Surfaces we seal
- Period & listed homes
- Brick reveals
- Timber door frames
- Stone surrounds
- Sash and case windows
- Tenement windows
Do you need sand mastic in Foots Cray?
Shallow joints are a common cause. Mastic that’s too thin cracks and drops out, which is why we pack deep voids first and get the depth right.
Common reasons people contact us are:
- Silicone on a period window that looks wrong
- Mastic that needs renewing before redecorating
- Mastic round period door frames that has failed
- Weathered mastic on the most exposed windows
Schools such as Orchard Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Questions to ask before booking
- How long to leave it before use
- What happens if the job turns out different
- How the joint is cleaned and prepared
- What guarantee comes with the work
For landlords and businesses
If you manage several properties in or around Foots Cray, several properties can go on one quote. Send us the addresses and the work at each, and pictures by email help.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can be quoted together.
What affects the quote in Foots Cray
Your quote is based on your job. We look at:
- Whether there’s mould to deal with
- The old material and how stubborn it is
- How much there is to do
- Which sealant suits the joint
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
What we need to know
You don’t need to know the technical terms. Just tell us:
- A few pictures by email, if you can
- The address or postcode of the job
- Whether it’s a home or a business
- Any previous sealing or DIY work
Every job is quoted individually, so start by telling us what you need. Just phone 0345 464 0079 or drop us an email with the details.
Questions from Foots Cray
Can you do sand mastic in Foots Cray?
Yes. We work across London and the South East, and Foots Cray is part of that. You can ring 0345 464 0079 or send us an email and let us know what needs doing, and we will give you a clear quote.
Is parking a problem for a job in Foots Cray?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Which is right for my windows, sand mastic or modern sealant?
It depends on the window. Period windows in stone or brick normally suit sand mastic, while modern frames normally get a flexible sealant.
Do I have to be there?
That depends on where the joints are. Inside work needs someone to give us access.
Are you insured?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
Is it messy?
Not at all. The area is protected while we work and cleaned up afterwards.
How long does sand mastic 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.
Are you ARBOMaster approved?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
How the visit works
We bring everything the job needs with us, so there’s nothing for you to buy. Once we’ve agreed what’s being done, the area is protected and the work begins. Most jobs take anything from a few hours to a full day, depending on how many windows. In a London area like Foots Cray, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- We check the window surrounds and agree which joints need renewing.
- Old, loose mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The mastic is finished to sit tidily against the stone or brick.
Before we arrive
- For indoor joints, keep the area dry beforehand if you can
- Tell us about any water getting in
- On commercial sites, let us know about site rules
Get a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is. Whenever you are ready, call 0345 464 0079 or drop us an email.
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What sand mastic looks like in Foots Cray
Historic houses like Danson House (about 2.8 miles north) are a reminder that the area around Foots Cray has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. In a converted house or block, who looks after the windows depends on the lease, so check that before booking.
Rented homes near Sidcup station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about. For an older house near a landmark such as Parish Church of All Saints, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Foots Cray is about 1 mile south-east of Sidcup, in Greater London. Homes, rented property, offices and hotels in Foots Cray is covered for sand mastic. Every job comes with our one-year guarantee. Across Greater London, we cover 764 places, Foots Cray among them. For nearby work, see our London page, about 11 miles away.
Work in DA14 and BR5 works the same way as everywhere else we cover. We cover properties on Cray Road, Evry Road and The Avenue and the roads around them. Foots Cray is on the A223, which makes it straightforward to reach with everything needed for sand mastic. Neighbouring places we cover for sand mastic include Ruxley (1 mile east), Albany Park (1 mile north-west), Upper Ruxley (1 mile east), Sidcup (1 mile north-west) and North Cray (2 miles north-east). Within a short drive, we also cover London (11 miles north-west), City of Westminster (13 miles north-west), Marylebone (13 miles north-west), Kensington (15 miles north-west), St Pancras (13 miles north-west) and Shoreditch (11 miles north-west).
Around Foots Cray
Around Foots Cray, our work takes us to homes and buildings near Foots Cray Meadows, Kemnal Technology College and Walsingham School and the streets around them. For rail, the closest station is Sidcup station, about 1.4 miles north of the centre. Well-known places in the area include Metropolitan Police Museum (1.3 miles north-west) and Queen Mary's Hospital (0.6 miles west). The countryside around Foots Cray includes Summer Hill and The Warren.
Why act early in Foots Cray
Gaps round a sash window let in rain and draughts. Left, water can reach the timber and the wall, so dealing with it now protects both. In a flat in Foots Cray, failed sealant seldom stays inside your own four walls: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we will explain the quote if you ask.
Why choose Mr Mastic in Foots Cray
- We are fully insured
- Old sealant always removed completely
- 180+ five-star Google reviews
- Tidy, careful work
Read how sealant jobs are priced and our reviews.