Medway · England
Sand mastic for sash & case windows in Twydall, Medway
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homeowners, landlords and businesses in Twydall. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Mastic worn away on windows facing the weather
- Old sand mastic that has cracked, crumbled or fallen out
- Open joints round the window box
Sand mastic in Twydall
Our applicators renew the sand mastic around sash and case windows and doors set in stone or brick. Out comes the old, loose mastic, and new mastic is applied and shaped by hand. Typical jobs include silicone on a period window that looks wrong and cracked mastic round a front door frame, on timber door frames, stone surrounds and brick reveals.
Houses in smaller places like Twydall can stand more in the open than those in a built-up town, so exposed windows and doors face the weather head on. That’s hard on the mastic around frames and sills.
The work is covered for a year after we finish. If anything is not right with it, ring 0345 464 0079 or drop us an email.
- Location
- Twydall (ME8, ME7)
- Region
- Medway
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Questions from Twydall
Does the coastal weather in Twydall affect outside sealant?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
I let a flat near Rainham (Kent) station. Can you help?
Yes, we work for landlords and agents. You can call 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before work begins.
What does sand mastic cost?
Size, access and the old material all affect the cost. Call for a quick quote.
Which is right for my windows, sand mastic or modern sealant?
We will talk it through with you. Sand mastic suits many period homes, and modern sealants suit newer frames.
How long does sand mastic take to go off?
It skins over fairly quickly but takes longer to harden fully. We’ll tell you what to expect for your job.
Can you seal over the old sealant?
No, and we never do. It may look fine at first, but the new layer lifts away from the old one. The old sealant has to come out completely.
Do I need to be at home?
We need access to the joints, so we will agree that with you when we book. Indoors, that normally means someone at home.
Will there be a smell?
Possibly a little. Any smell clears as the sealant cures.
Also near Twydall
Also in Twydall
Frames and glazing around Twydall
Twydall is within about 2 miles of 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. With historic houses such as Restoration House (about 3.6 miles west) nearby, there’s older building stock in the area around Twydall as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
Homes close to Holy Trinity Church include some older properties, and the joint between an old wall and a newer frame is normally the first place rain gets in. Schools such as Twydall Primary School and Nursery are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Twydall is about 1 mile east of Gillingham, in Medway. Every kind of property in Twydall can book us for sand mastic, old or new, large or small. The work is guaranteed for a year. Our Medway coverage runs to 68 places, Twydall among them. We also work in Chelmsford, around 25 miles away.
Jobs for sand mastic in ME8 and ME7 works the same way as everywhere else we cover. Local streets include Pump Lane, Blean Road and Herne Road. Twydall sits on or near the A2, which makes travel easy. If you are just outside Twydall, we cover Gillingham (1 mile west), Lower Twydall (1 mile north), Grange (1 mile north), Wigmore (1 mile south) and Darland (1 mile south-west). We also work in nearby towns such as Chatham (3 miles south-west), Rochester (4 miles west), Strood (5 miles west), Lordswood (3 miles south-west), Hoo St Werburgh (4 miles north) and Chatham Waterfront (3 miles west). Twydall is one of the larger places we cover in Medway.
What’s near Twydall
We work in homes and buildings around Rainham Mark Grammar School, Howard School and The Three Mariners pub, among other places. The closest station to Twydall is Rainham (Kent) station, roughly 1.2 miles south-east. Well-known places in the area include Upnor Castle (3.4 miles north-west) and Six Poor Travellers House (3.7 miles west). Not far away are Bishop Saltings and Boxley Hills.
Signs you need sand mastic in Twydall
Timber swells and shrinks with the weather. That movement opens up the mastic joint little by little.
Any of these means the joints need attention:
- Gaps where the frame meets the masonry
- Gaps round a timber door in stone or brick
- Old cement repairs round a window that have failed
- Weathered mastic on the most exposed windows
Rented homes near Rainham (Kent) station change hands often, and older sash windows in a rental need their mastic kept sound to keep the weather out.
Comparing quotes
- How long to leave it before use
- What guarantee comes with the work
- Whether all the old sealant comes out first
- How the colour is chosen
How the visit works
Before we leave, we go over the finished joints with you 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 how much there is to do. In a smaller place like Twydall, parking is seldom the issue; lanes, gates and long drives are worth mentioning. For outside work, side access and the height of the joints help us plan.
- We start by checking each surround and agreeing the joints to renew.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- We dress the surface so it sits neatly against the masonry.
Before we arrive
- Where the joints are inside, avoid wetting them before we arrive
- Mention any tricky access
- Plan for the work area to be out of bounds to pets and children
Get a quote
If you are in Twydall and need sand mastic, phone 0345 464 0079 or drop us an email. Tell us what the problem is and where, and you will get a clear quote before work begins.
Advice
For landlords and businesses
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
Why deal with it now?
Not every filler suits an old window surround. Sand mastic matches what was there, which can matter on listed and conservation-area homes. In a smaller place like Twydall, wherever a wall is exposed, a failed outside joint is a real source of damp. Indoors, a failed seal lets water into floors and panels as it would anywhere.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Why Twydall clients choose us
- Arbo and Everbuild products
- Anti-fungal sanitary silicone in wet areas
- More than 20 years in sealant work
- ARBOMaster approved applicator
Read our cost guide and what customers say.
How we quote for sand mastic
For a quick quote, just ask. What matters most is:
- Working hours on commercial sites
- Any mould that needs treating
- Whether the work is at height
- Which sealant suits the joint
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you’re unsure, ring 0345 464 0079 or drop us an email for an honest opinion and a quote.
Asking for a quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- If someone has resealed it before
- Where the job is, and your postcode
- What’s wrong with the joints now
- The rough size of the job
Asking for a quote is easy: let us know the job and the location and its rough size. Photos by email help us understand the job, and we will come back to you with a quote.
Different surfaces, different methods
Period and listed homes
Materials matter on listed and conservation-area homes. Sand mastic is often the preferred finish.
Brick reveals
Sand mastic is also used where timber frames meet brick. It gives a traditional finish.
DIY sealant or a professional job?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.