Wokingham · England

Wokingham Sand Mastic

Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homeowners, landlords and businesses in Wokingham. Fully insured, ARBOMaster approved and guaranteed for a year.

  • A silicone bead on a sash window that spoils the look
  • Tired mastic found when preparing windows for paint
  • Gaps where the frame meets the masonry

Need sand mastic in Wokingham?

Why act early in Wokingham

Before painting the windows, it pays to renew the mastic. Paint over cracked mastic won’t stop the gaps, and the new mastic is traditionally left unpainted. In a busy place like Wokingham, a failed joint in a flat or office can send water into the space below, where it can go unnoticed until the damage is done.

Leaving a failed joint normally makes the job bigger, not smaller, as water and mould keep getting in. If you are not sure whether it needs doing, phone 0345 464 0079 or send us an email and we will give you an honest view and a quote.

Why Wokingham clients choose us

  • An ARBOMaster approved applicator
  • Domestic, commercial and hotel work
  • 180+ five-star Google reviews
  • Sanitary silicone with an anti-fungal additive in wet areas

See what affects the cost or our reviews.

About our sand mastic in Wokingham

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 have silicone on a period window that looks wrong and mastic that needs renewing before redecorating, we can put it right.

Town-centre flats, shops and offices in Wokingham have long runs of frames and glazing, often on upper floors. Failed joints up there let in water that can go unnoticed for a while.

All of our work is guaranteed for twelve months.

Mr Mastic applicator sealing the top of a white uPVC door frame on a red-brick house
Place
Wokingham (RG40, RG41, RG7, RG10)
Wider area
Wokingham
Cover
One year on every job
Quotes
A clear price before work begins
Telephone
0345 464 0079
Page updated
26 October 2026

For landlords and businesses

Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.

We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.

Signs you need sand mastic in Wokingham

Rain on the window surround works into any crack and pushes it out. Windows facing the weather tend to go first.

Look out for any of the following:

  • Draughty sash windows at the surround
  • Old cement repairs round a window that have failed
  • Gaps where the frame meets the masonry
  • Failed mastic on an exposed elevation

If you let a flat or house near Wokingham station, cracked sand mastic around sash windows lets in the draughts tenants complain about.

Comparing quotes

  • Is the old sealant removed completely?
  • Who turns up on the day
  • How the surfaces are prepared before sealing
  • Whether they’re fully insured

How to choose a mastic man

Frames and glazing around Wokingham

Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.

Schools such as Walter Infant School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. If you live in an older home near Church of St Paul, the joint between an old wall and a newer frame is normally the first place rain gets in.

Wokingham is about 33 miles west of London, in Wokingham. If you need sand mastic in Wokingham, it’s easy to get a quote: please ring 0345 464 0079 or email us. We are based in Crawley and cover Wokingham included. We cover 35 towns and villages across Wokingham, from the larger towns to small villages. For nearby work, see our Reading page, about 6 miles away.

Postcode districts we cover here for sand mastic: RG40, RG41, RG7 and RG10. You will find streets such as Station Road, Market Square and London Road, and we cover them all. Main roads around Wokingham include the A321 and A329, so getting to you is simple. Neighbouring places we cover for sand mastic include Woosehill (1 mile west), Emmbrook (1 mile north), Sindlesham (2 miles north-west), Winnersh (2 miles north-west) and Hurst (3 miles north). We also work in nearby towns such as Reading (6 miles north-west), Woodley (4 miles north-west), Earley (4 miles north-west), Crowthorne (3 miles south-east), Lower Earley (3 miles west) and Newtown (5 miles north-west).

Near you in Wokingham

Locally, jobs take us to homes and businesses close to The Holt School, St Crispin's School and The Station Tap. Wokingham has its own railway station: Wokingham station. Nearby you will also find Berkshire Library & Museum of Freemasonry (1.9 miles north-west) and Wokingham Hospital (under half a mile east). Not far away are Heath Lake and Sonning Hill.

Map of Wokingham © OpenStreetMap contributors

How the job changes by surface

Stone surrounds

Stone surrounds suit sand mastic well. The finish blends with the masonry.

Sash and case windows

A sash window’s box frame sits in the masonry opening. Sand mastic seals the joint round it.

Honest limits

We’d rather tell you now than do work that will not last, so these are the limits:

  • Sashes that rattle, stick or won’t open
  • Crumbling stone or brickwork round the window
  • Timber that has rotted

Not sure which it is? You can ring 0345 464 0079 or send us an email and we will tell you honestly before you book.

Joints and surfaces we work on

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

Your questions about sand mastic in Wokingham

What guarantee comes with sand mastic in Wokingham?

Every job comes with our 12-month guarantee, wherever it is. We’re also fully insured and ARBOMaster approved.

Can you do sand mastic in Wokingham?

Yes, Wokingham is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or drop us an email and let us know what needs doing.

Are you insured?

Yes. Full insurance covers our work.

Will there be a smell?

Possibly a little. Any smell clears as the sealant cures, and ventilation helps.

How long does sand mastic take?

Most jobs take a few hours per window, depending on the condition of the joints, including the preparation. We will confirm how long when we quote.

When will the new mastic be hard?

Not right away. It skins first and hardens fully later, and we’ll tell you what to expect.

Do you work for landlords and businesses?

Yes, regularly. Several properties can be quoted together.

Which is right for my windows, sand mastic or modern sealant?

We will help you decide. Period homes often look best with sand mastic, and modern sealants suit newer frames.

The process

The work is kept neat and contained to the area we’re working on, so you can carry on as normal. Expect the work to take anything from a few hours to a full day, depending on how many windows, and we explain the cure time before we leave. For homes and businesses in busier parts of Wokingham, parking needs a little planning. Let us know about stairs, lifts or shared entrances too.

  1. First we agree which joints need doing.
  2. We remove the old, loose mastic.
  3. We pack any deep voids first.
  4. We apply the mastic by hand and shape it.
  5. We dress the finish so it sits neatly against the masonry.

How to prepare

  • Where the joints are inside, avoid wetting them before we arrive
  • Keep pets and children clear of the area while we work
  • For business premises, tell us about site rules or sign-in

Getting a quote

Asking for a quote is easy: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job, and we’ll come back to you with a quote.

Ask for a quote

Read more

Keeping the joints in good condition

How long the joints last depends on use and care. We suggest:

  • Plan mastic work ahead of painting
  • Don’t run silicone over sand mastic
  • Ask the planning authority about consent for listed or conservation-area homes
  • Look over the window mastic once a year

Leave the new mastic unpainted, as traditional guidance advises. If you are redecorating, ask us first.

Fine cracks show the mastic is starting to fail. Renewing it then is simpler than waiting until it falls out.

20+ yearsMastic and sealant specialists
ARBOMaster approvedApproved applicator for Arbo sealants
Fully insuredDomestic, commercial and hotels
One-year guaranteeOn every job