Hampshire · England
Sand mastic for sash & case windows in High Cross, Hampshire
Problem with your window and door surrounds in High Cross? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Wind and rain getting in round a sash window
- Tired mastic found when preparing windows for paint
- Old sand mastic that has cracked, crumbled or fallen out
When it isn’t the sealant
We’ll always be straight with you, so here’s what sealant cannot fix:
- Cracked or broken glass
- Planning or listed building consent (your local planning authority decides)
- Sash cords, weights and draught-proofing of the sashes
If in doubt, ring 0345 464 0079 or send us an email and we will say what we think.
Surfaces we seal
- Timber door frames
- Period & listed homes
- Sash and case windows
- Tenement windows
- Brick reveals
- Stone surrounds
How we handle sand mastic in High Cross
We work across High Cross renewing sand mastic on sash windows and doors. Every joint is cleaned out and filled by hand, finished to suit the masonry. We work on period & listed homes, brick reveals and sash and case windows, and common reasons people get in touch are patchy fillers round a sash window and silicone on a period window that looks wrong.
Somewhere as small as High Cross, older homes often have timber frames set in stone or brickwork. Not every older frame suits a modern silicone bead, and sometimes a traditional sand mastic is the better choice.
Every job is covered by our 12-month guarantee.
- Place
- High Cross (GU32)
- Wider area
- Hampshire
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
The process
Before we leave, we go over the finished joints with you. The work normally takes a few hours for a single window, longer for several, depending on the size of the job. Somewhere as small as High Cross, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
Getting ready for the visit
- Tell us about any water getting in
- Keep children and pets away from the work area
- Mention if the joints have been sealed before
Getting a quote
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we will explain what’s involved before giving you a price.
Advice
What sand mastic looks like in High Cross
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Schools such as Froxfield Church of England Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. Letting a property close to Petersfield station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about. If you live in an older home near Church of St Peter, the joint between an old wall and a newer frame is usually the first place rain gets in.
High Cross is about 3 miles north-west of Petersfield, in Hampshire. Jobs in High Cross get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. Across Hampshire, we cover 683 places, and High Cross is one of them. We also work in Portsmouth, around 16 miles away.
Our applicators cover all of the GU32 postcode area for sand mastic and the streets around it. Local streets include High Cross Lane, Dellfield and Deans Dell, all of which we cover. We also cover the places around High Cross: Froxfield Green (1 mile south-west), Oakshott (2 miles north-east), Langrish (2 miles south), Stroud (2 miles south) and Steep (2 miles east). We also work in nearby towns such as Winchester (15 miles west), Havant (12 miles south), Horndean (9 miles south), Alton (8 miles north), Waterlooville (11 miles south) and Petersfield (3 miles south-east).
Local landmarks in High Cross
High Cross’s nearest station is Petersfield station, roughly 2.6 miles south-east. A little further out are Petersfield Community Hospital (2.7 miles south-east) and Bear Museum (3.1 miles south-east). The countryside around High Cross includes Wheatham Hill and Liss Riverside Railway Walk South.
Leave it or put it right?
New sash windows are a major, costly change, and in listed buildings it may need consent. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. Where a wall is exposed, as many are in small places like High Cross, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Leaving a failed joint generally makes the job bigger, not smaller. If you’re unsure, ring 0345 464 0079 or send us an email for an honest opinion and a quote.
Why choose Mr Mastic in High Cross
- Homes, businesses and hotels
- Old sealant always removed completely
- Anti-fungal sanitary silicone in wet areas
- Over 20 years’ experience
Take a look at how sealant jobs are priced or what customers say.
Also near High Cross
Other services in High Cross
Different surfaces, different methods
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair, so check who is responsible first.
Period and listed homes
Materials matter on listed and conservation-area homes. Like-for-like sand mastic is normally favoured.
Landlords, agents and businesses in High Cross
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can go on one quote.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
What affects the quote in High Cross
Some jobs are bigger than they look, and some smaller. What affects the quote:
- The number of rooms or windows
- Whether old sealant or filler has to be cut out
- The number and length of the joints
- Any working-time requirements on site
The cost reflects the work involved, not a rough estimate. That’s why we ask a few questions first.
What to tell us for a quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- Roughly how big the job is
- What’s wrong with the joints now
- Any previous sealing or DIY work
- Where the property is
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.
Common questions in High Cross
Will you come out to High Cross?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
I let a flat near Petersfield station. Can you help?
Yes. We work for landlords and agents as well as householders, and several properties can be quoted together. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear quote.
Should I use sand mastic or silicone?
That depends on your windows. Period windows in stone or brick usually suit sand mastic, while modern frames normally get a flexible sealant.
What exactly is sand mastic?
It’s sand mixed with a linseed-oil-based binder for the joint between timber frames and masonry.
How long does sand mastic take?
That depends on the amount of work, but most jobs take anything from a few hours to a full day, depending on how many windows. We’ll tell you when we quote.
Do I have to be there?
That depends on where the joints are. For work indoors, someone needs to let us in, while outside work can sometimes be arranged differently.
Where is Mr Mastic based?
We work from Crawley. Our applicators cover High Cross, along with the rest of our area.
Can sand mastic be painted?
Sand mastic is normally left unpainted, as guidance on traditional windows advises. Ask us before decorating.
Keeping the joints in good condition
Looking after new joints is easy:
- Ask the planning authority about consent for listed or conservation-area homes
- Ask us before painting near the mastic
- Check the mastic when you check the paintwork
- Avoid heavy scraping on the mastic joint
Check the mastic when you check the paintwork. Catching cracks early keeps repairs small.
Small cracks are a sign the mastic is ageing. It’s easier to renew it before it drops out.