Medway · England
Sand Mastic in Grain
Sand mastic for Grain and the surrounding area: careful preparation, the right product and tidy work. Call for a quick quote.
- Mastic dropping out of the joint
- Tired mastic found when preparing windows for paint
- Cement or filler used on old window joints that has cracked
What we’re called out for in Grain
Sand mastic slowly weathers. It dries out, cracks and loses its grip on the stone or timber.
These are the problems we are asked about most:
- Window mastic to renew ahead of painting
- Open joints round the window box
- Silicone on a period window that looks wrong
- Patchy fillers round a sash window
Schools such as St James Church of England Primary Academy are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Questions to ask before booking
- How hidden problems are handled
- Is VAT in the price?
- How the surfaces are prepared before sealing
- How long to leave it before use
How we handle sand mastic in Grain
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s made from sand and a linseed-oil-based binder, applied by hand. On period homes, it looks right where silicone wouldn’t. We work on sash and case windows, period & listed homes and tenement windows, and people most often call us about old sand mastic that has cracked, crumbled or fallen out and cement or filler used on old window joints that has cracked.
Outdoor sealant needs dry, clean surfaces, so work on frames around Grain is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Place
- Grain (ME3)
- Wider area
- Medway
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
The process
Once we’re on site, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. Most jobs then take anything from a few hours to a full day, depending on how many windows. For a village or hamlet like Grain, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We start by checking each surround and agreeing the joints to renew.
- Old, loose mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic isn’t too thick.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The finish is dressed so it sits neatly against the stone or brick.
How to prepare
- Mention if the joints have been sealed before
- Let us know about stairs, lifts or work at height
- Let us know about parking restrictions
How to get a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we’ll talk you through the work and give you a clear quote.
Related advice
Grain questions
Does the coastal weather in Grain affect outside sealant?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. The right product, a clean joint and the right depth all help it cope.
Is Grain within the area you cover?
Yes. Grain is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Can sand mastic be painted?
It’s traditionally left unpainted, which is what traditional guidance recommends. Talk to us before any painting near it.
What do you need from me for a quote?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Is it messy?
No. The area is protected while we work and cleaned up afterwards.
Do I have to be there?
We need access to the joints, so we will agree that with you when we book. For inside work, that normally means someone being in.
Are you ARBOMaster approved?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
When will the new mastic be hard?
A skin forms quite soon, but full hardening takes longer. We’ll tell you what to expect for your job.
Sand mastic in Grain: local notes
Grain is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For an older house near a landmark such as Church of St James, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. If you let a flat or house near Sheerness-On-Sea station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Grain is about 5 miles north-west of Minster, in Medway. If you need sand mastic in Grain, please call 0345 464 0079 or send us an email for a quick quote. We’re based in Crawley and cover Medway. Our area takes in 68 places across Medway, from the larger towns to small villages. Our Chelmsford page covers work nearby, about 22 miles away.
Work in ME3 is quoted and booked the same way as anywhere else. We cover properties on High Street, Power Station Road and Chapel Road. Neighbouring places we cover for sand mastic include Wallend (1 mile west), Blue Town (2 miles south-east), Sheerness (2 miles south-east), Queenborough (3 miles south-east) and Rushenden (3 miles south). We also work in nearby towns such as Gillingham (8 miles south-west), Chatham (10 miles south-west), Rochester (10 miles south-west), Rainham (8 miles south-west), Strood (11 miles south-west) and Luton (10 miles south-west).
Around Grain
We work in homes and buildings around The Hogarth Inn and the streets around them. For rail, the closest station is Sheerness-On-Sea station, about 2.1 miles south-east of the centre. Other landmarks nearby include Bluetown Heritage Centre (1.8 miles south-east).
Keeping the joints in good condition
So the new joints stay in good condition:
- Leave the new mastic unpainted
- Find out about consent before window work on a listed home
- Clear gutters so water doesn’t pour onto the windows
- Ask a joiner to look at soft timber first
Make sure water drains away from the window surround. Constant wetting wears the mastic faster.
Fine cracks show the mastic is starting to fail. Renewing it then is simpler than waiting until it falls out.
Towns and villages near Grain
Also in Grain
Work for landlords, hotels and businesses
Hotels need rooms back in use, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
Landlords and agents in Grain can book us as well as householders. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
What we cannot put right
Some problems need a builder, plumber or other trade rather than us:
- Whether work needs listed building consent
- Putty and glazing repairs
- Sash cords, weights and draught-proofing of the sashes
If in doubt, ring 0345 464 0079 or send us an email and we’ll say what we think before booking.
Surfaces we seal
- Period & listed homes
- Stone surrounds
- Tenement windows
- Brick reveals
- Timber door frames
- Sash and case windows
DIY versus a professional finish
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Surface by surface
Brick reveals
An open joint at a brick reveal lets weather in. New mastic seals the gap.
Timber door frames
Doors face weather and wear and the mastic can crack early. We rake it out and renew it.