Surrey · England
Sand Mastic in Crosswater
Professional sand mastic in and around Crosswater, with old sealant always removed completely.
- Silicone on a period window that looks wrong
- Cement or filler used on old window joints that has cracked
- Gaps where the frame meets the masonry
About our sand mastic in Crosswater
Sand mastic doesn’t last for ever, leaving gaps round the window. We rake it out and renew it and tidies the surround. Common call-outs are for mastic worn away on windows facing the weather and gaps between timber frames and stone or brick, across sash and case windows, timber door frames and brick reveals.
Homes in small places like Crosswater often stand in the open, with little to shelter their windows from wind and rain. Exposed frames and sills lose their mastic sooner than sheltered ones.
You get a one-year guarantee, the same in Crosswater as everywhere else we work.
- Where
- Crosswater (GU10)
- Region
- Surrey
- Guarantee
- 12 months on all our work
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Crosswater questions
I let a flat near Farnham station. Can you help?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before we start.
Will you come out to Crosswater?
Yes. Crosswater 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.
What exactly is sand mastic?
It’s the traditional filler for the joint round timber windows and doors. It combines sand with a linseed-oil-based binder.
Does someone need to be in?
It depends on the job. Inside work needs someone to give us access, and for outside work we will agree access with you when we book.
When will the new mastic be hard?
The surface skins quite quickly and it hardens fully over a longer time. Timing depends on the weather and the joint.
What guarantee comes with the work?
Every job comes with our 12-month guarantee, and we are fully insured.
Do you remove the old sealant?
Yes, always, and completely. New sealant will not bond properly to old, so any old material comes out before anything new goes in.
What do you put in the joint?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
Honest limits
We won’t take on work that won’t last, so these are the limits:
- Timber that has rotted
- Sashes that rattle, stick or won’t open
- Crumbling stone or brickwork round the window
Not sure which it is? You can phone 0345 464 0079 or send us an email and we’ll tell you honestly.
Where we work in Crosswater
- Timber door frames
- Brick reveals
- Stone surrounds
- Tenement windows
- Sash and case windows
- Period & listed homes
What sand mastic looks like in Crosswater
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. Historic houses like Farnham Castle (about 4.9 miles north) are a reminder that the area around Crosswater has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Letting a property close to Farnham station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about. Homes close to St John the Evangelist include some older properties, and the joint between an old wall and a newer frame is normally the first place rain gets in.
Crosswater is about 4 miles south of Farnham, in Surrey. Every kind of property in Crosswater can book us for sand mastic, old or new, large or small. Every job comes with our one-year guarantee. Our Surrey coverage runs to 395 places, Crosswater among them. Our Reading page covers work nearby (22 miles or so).
Every address in GU10 is covered for sand mastic. Close by, we work in Churt (1 mile south), Green Cross (1 mile south-east), Frensham (1 mile north-west), Barford (1 mile south) and Rushmoor (1 mile north-east). Further out, we also cover Guildford (11 miles north-east), Woking (15 miles north-east), Camberley (13 miles north), Farnham (4 miles north), Frimley (12 miles north) and Haslemere (5 miles south-east).
Landmarks near Crosswater
Locally, jobs take us to homes and businesses close to Crossways Inn and The Flashes. Crosswater’s nearest station is Farnham station, about 4.3 miles north. A little further out are Farnham Castle (4.9 miles north) and Chase Community Hospital (4.7 miles south-west). For a walk, there’s Gibbet Hill and Upper Lake.
Aftercare tips
To keep the joints looking good and working properly:
- Check with your local planning authority if your home is listed
- Inspect the joints round the windows every year or so
- Sort the mastic before the decorators arrive
- Leave the new mastic unpainted
Check the mastic when you check the paintwork. Small cracks are easier to deal with early.
Crumbling mastic lets rain into the joint. It can soak into the frame and the surrounding masonry, so renewing it early is worth it.
Landlord and commercial work in Crosswater
For anyone letting property in or around Crosswater, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs.
Letting agents and landlords in Crosswater can book us as well as householders. Sealant work between tenants is a simple way to keep a property in good order.
Towns and villages near Crosswater
More services for Crosswater
What the job involves on each surface
Brick reveals
Sand mastic is also used where timber frames meet brick. It gives a traditional finish.
Timber door frames
A neat sand mastic joint round a front door suits a period home.
Common problems we fix in Crosswater
Timber frames move with the seasons. The movement cracks the mastic over time.
These are the problems we are asked about most:
- Mastic dropping out of the joint
- Old cement repairs round a window that have failed
- Gaps between timber frames and stone or brick
- Wind and rain getting in round a sash window
For site and facilities teams at buildings such as St John's CofE Aided Infant School, the mastic around its windows and doors needs looking after like any other building’s.
Questions to ask before you book
- How long the guarantee is
- Which sealant they’ll use, and why
- How long to leave it before use
- How hidden problems are handled
What we do, step by step
Most of a good job is in the preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. In total, it normally takes a few hours per window, depending on the condition of the joints. In a small place like Crosswater, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
How to prepare
- Let us know if you’ve seen damp or leaks
- Mention any tricky access
- Clear items away from the joints we’re working on
How to get a quote
For sand mastic in Crosswater, phone 0345 464 0079 or email us. Tell us what the problem is and where, and you will get a clear quote before work begins.
Related advice
Should I try it myself first?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.