Medway · England

Gillingham Sand Mastic

Sand mastic for Gillingham and the surrounding area: careful preparation, the right product and tidy work. Call for a quick quote.

  • A silicone bead on a sash window that spoils the look
  • Failed mastic on an exposed elevation
  • Draughts and rain around sash boxes

Book sand mastic in Gillingham

Can I do it myself?

Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.

If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.

About our sand mastic in Gillingham

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. We are often asked to deal with gaps where the frame meets the masonry and draughty sash windows at the surround, on tenement windows, sash and case windows and brick reveals.

With a large rental market, Gillingham has plenty of windows that landlords need to keep weathertight. Gaps around a frame let in draughts and water, and tenants notice.

Big or small, you get the same 12-month guarantee in Gillingham and across Medway.

Mr Mastic applicator sealing the top of a white uPVC door frame on a red-brick house
Location
Gillingham (ME8, ME7, ME4, ME5)
Wider area
Medway
Guarantee
One year on every job
Price
Quoted before any work starts
Phone
0345 464 0079
Updated
26 October 2026

Do you need sand mastic in Gillingham?

Decorating can disturb tired mastic. Many people find it crumbling when they prepare the windows.

The problems people usually mention when they call include:

  • A silicone bead on a sash window that spoils the look
  • Cracked mastic round a front door frame
  • Tired mastic found when preparing windows for paint
  • Crumbling sand mastic round a window

If you look after a building such as Featherby Junior School, larger buildings have plenty of frames, and the mastic around each one ages.

What your quote should include

  • How hidden problems are handled
  • Whether you can choose the colour
  • What the cure time is
  • Who does the work, and how experienced they are

10 questions to ask before you book

Questions from Gillingham

Does living near the coast affect sand mastic in Gillingham?

Near the sea, outside joints face more wind, rain and salt than they would inland, so the choice of sealant and the preparation matter even more. It’s worth checking the walls that face the sea first.

Can you do sand mastic in Gillingham?

Yes, Gillingham is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or send us an email and tell us what needs doing, and we will give you a clear price.

Do the sealants smell?

There can be a smell while the sealant cures, but it fades. Ventilation helps.

Are you fully insured?

Yes. We are fully insured.

Do you work for hotels and businesses?

Yes. Hotels, offices and other businesses use us, and we are fully insured.

Do you offer different sealant colours?

Normally, yes. Sealants come in white, clear, grey and other colours, and we agree the colour with you before we start.

What exactly is sand mastic?

It’s the traditional filler for the joint round timber windows and doors. It’s made with sand and a linseed-oil-based binder.

Where is Mr Mastic based?

We are based in Crawley, West Sussex, and we work across South East England, London and Scotland.

What happens on the day

There’s no need to move everything out, only the area right around the joints. We protect the rest, and the work takes anything from a few hours to a full day, depending on how many windows for a typical job. For homes and businesses in busier parts of Gillingham, parking needs a little planning. Let us know about stairs, lifts or shared entrances too.

  1. We start by checking each surround and agreeing the joints to renew.
  2. Old, loose mastic is raked out and the joint cleaned.
  3. Deep voids are packed so the mastic is the right thickness.
  4. We mix the sand mastic and apply it by hand, shaping it to the joint.
  5. The mastic is finished to sit tidily against the stone or brick.

How to prepare

  • Let us know about parking restrictions
  • Clear the area around the work
  • For business premises, tell us about site rules or sign-in

Getting a quote

Getting a quote is simple: let us know the job and the location. A few pictures by email make the job easier to understand, and we will take it from there.

Get a price

Advice

Landlord and commercial work in Gillingham

We work for letting agents and landlords as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order before the next move-in.

Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll quote.

When it is not the sealant

Before you book, it’s worth knowing the limits:

  • Damaged stone surrounds
  • Sash cords, weights and draught-proofing of the sashes
  • Planning or listed building consent (your local planning authority decides)

If in doubt, call 0345 464 0079 or email us and we will say what we think before booking.

What we seal

  • Stone surrounds
  • Sash and case windows
  • Period & listed homes
  • Brick reveals
  • Timber door frames
  • Tenement windows

Leave it or put it right?

A silicone bead can be quicker, but it can look wrong on a period surround. Sand mastic suits the building and finishes neatly against the masonry. For businesses in Gillingham, a room closed because of a leak or mould costs more than the sealant, so it pays to replace failing joints before they get that far.

Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. We take all of that into account in your quote.

Why Gillingham customers choose us

  • Any old sealant cut out fully, not covered over
  • More than 20 years in sealant work
  • Trusted Arbo and Everbuild sealants
  • Fully insured

Take a look at our cost guide or what customers say.

Looking after it afterwards

Joint life depends on how it’s used and looked after. We suggest:

  • Look over the window mastic once a year
  • Clear gutters so water doesn’t pour onto the windows
  • Check with your local planning authority if your home is listed
  • Have rotten timber repaired before new mastic goes in

Don’t touch or press the mastic while it hardens. It forms a skin fairly soon, but takes longer to harden fully.

Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall so early renewal protects both.

Sand mastic in Gillingham: local notes

Gillingham is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on the mastic around older windows and doors, especially on the side facing the sea. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.

Letting a property close to Gillingham (Kent) station? Then any sash windows need sound mastic to keep draughts and rain out. In the older streets around Holy Trinity Church, the joint between an old wall and a newer frame is generally the first place rain gets in.

Gillingham is about 30 miles east of London, in Medway. If you need sand mastic in Gillingham, it’s easy to get a quote: please phone 0345 464 0079 or send us an email. We cover Medway from our Crawley base, Gillingham included. Gillingham is one of 68 towns and villages in Medway we cover. Our Chelmsford page covers work nearby, about 26 miles away.

Work in ME8, ME7, ME4 and ME5 works the same way as everywhere else we cover. Whether your property is on Leeds Square, London Road and Dorset Square or a nearby road, our applicators can take on the job. With the A2 and A231 close by, Gillingham is easy for our applicators to reach for sand mastic. Close by, we work in Twydall (1 mile east), Lower Twydall (1 mile north-east), Grange (1 mile north), Darland (1 mile south-west) and Hale (1 mile south-west). Further out, we also cover Rochester (4 miles west), Strood (4 miles west), Lordswood (3 miles south-west), Hoo St Werburgh (4 miles north), Rochester Riverside (3 miles north-west) and Walderslade (3 miles south-west). Gillingham is among the bigger towns we cover in Medway.

Near you in Gillingham

Locally, jobs take us to homes and businesses close to The Robert Napier School, The Robert Napier School and The Star pub and the streets around them. Gillingham’s nearest station is Gillingham (Kent) station, roughly 1.5 miles north-west. A little further out are Medway Maritime Hospital (1.6 miles west) and Six Poor Travellers House (3.3 miles west). The countryside around Gillingham includes Blue Bell Hill and Bishop Saltings.

Map of Gillingham © OpenStreetMap contributors
20+ yearsMastic and sealant specialists
ARBOMaster approvedApproved applicator for Arbo sealants
Fully insuredDomestic, commercial and hotels
One-year guaranteeOn every job