West Sussex · England
Sand Mastic in Selham
Sand mastic across Selham and nearby, with old sealant always removed completely and a 12-month guarantee.
- Cement or filler used on old window joints that has cracked
- Mastic round period door frames that has failed
- Wind and rain getting in round a sash window
Sand mastic in Selham, done properly
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s made from sand and a linseed-oil-based binder and built up by hand. On period homes, it looks right where silicone wouldn’t. We are often asked to deal with gaps round a timber door in stone or brick and cement or filler used on old window joints that has cracked, on period & listed homes, timber door frames and sash and case windows.
Around Selham, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
Big or small, you get the same one-year guarantee.
- Where
- Selham (GU28)
- Wider area
- West Sussex
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Why deal with it now?
If you are redecorating, renew the mastic first. Paint over cracked mastic will not stop the gaps and traditional guidance is to leave the new mastic unpainted. In a small place like Selham, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed. Ask us for a quote and we will explain what it covers.
Why Selham clients choose us
- Over 20 years’ experience
- Anti-fungal silicone where joints get wet
- Tidy, careful work
- Any old sealant cut out fully, not covered over
Nearby places to Selham
What else we do in Selham
Common problems we fix in Selham
Over the years, sand mastic weathers. It hardens, cracks and starts to come away from the frame or the masonry.
The problems people generally mention when they call include:
- Weathered mastic on the most exposed windows
- Wind and rain getting in round a sash window
- Window mastic to renew ahead of painting
- Silicone on a period window that looks wrong
In the older streets around Church of St James, the joint between an old wall and a newer frame is normally the first place rain gets in.
Before booking anyone
- How the joint is cleaned and prepared
- Whether VAT is included
- How hidden problems are handled
- Who does the work, and how experienced they are
When it is not the sealant
New sealant cannot fix everything, and we’ll tell you before work begins. Sealant will not put right:
- Broken panes
- Decayed frames that need repair
- Sash cords, weights and draught-proofing of the sashes
If you’re not sure, just ring 0345 464 0079 or send us an email and we’ll give you a straight answer.
Joints and surfaces we work on
- Sash and case windows
- Period & listed homes
- Stone surrounds
- Timber door frames
- Brick reveals
- Tenement windows
Windows and doors in Selham
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. With historic houses such as Cowdray House (about 2.7 miles west) nearby, there’s older building stock in the area around Selham as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
Around Selham, as everywhere, sand mastic is only as good as the preparation behind it.
Selham is about 8 miles south of Haslemere, in West Sussex. Across the GU28 area, we cover sand mastic for homes and businesses. Across West Sussex, we cover 371 places, Selham among them. Our Portsmouth page covers work nearby.
Jobs for sand mastic in GU28 works the same way as everywhere else we cover. Other places close to Selham include South Ambersham (1 mile west), River (2 miles north), Tillington (2 miles north-east), Upperton (2 miles north-east) and Rotherbridge (2 miles east). Within a short drive, we also cover Bognor Regis (13 miles south), Chichester (11 miles south-west), Littlehampton (13 miles south-east), Emsworth (14 miles south-west), Rustington (14 miles south-east) and Storrington (11 miles east).
What’s near Selham
Nearby you’ll also find Midhurst Community Hospital (2.9 miles west) and Coultershaw Heritage Site (2.5 miles east). Not far away are Graffham Common.
Landlord and commercial work in Selham
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
We work for landlords and agents as well as householders. Resealing between tenancies keeps a property looking cared for before the next move-in.
What happens on the day
A visit follows a simple pattern: we look at the joints together, mask and protect the surrounding surfaces, do the work and tidy away. It normally takes a few hours per window, depending on the condition of the joints. For a village or hamlet like Selham, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
Preparing for the visit
- On commercial sites, let us know about site rules
- Clear the area around the work
- Let us know if you’ve seen damp or leaks
Getting a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. Whenever you are ready, phone 0345 464 0079 or drop us an email.
Read more
Common questions in Selham
What guarantee comes with sand mastic in Selham?
All our work, in Selham and everywhere else, comes with a 12-month guarantee. We are fully insured, and an ARBOMaster approved applicator.
Do you cover smaller places like Selham?
Yes, Selham is covered. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Do you remove the old sealant?
Yes. We cut out all the old sealant and clean the joint before applying anything new.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator, and we’re fully insured.
Is it OK to seal over old sealant?
No. New silicone will not bond to old silicone, and anything trapped underneath, including mould and water, stays there. We remove it all first.
When will the new mastic be hard?
The surface skins quite quickly and it hardens fully over a longer time. The weather and joint depth both affect it.
Do you offer different sealant colours?
We will suggest a colour to suit the surroundings, from white and clear to greys and other shades. The choice depends on the product the joint needs.
Should I try DIY first?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. If it doesn’t work out, we can redo it.
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’ve already had a go yourself, that’s fine. We remove it and do the joint properly.
Different surfaces, different methods
Timber door frames
A neat sand mastic joint round a front door suits a period home.
Stone surrounds
Stone surrounds suit sand mastic well. It finishes to look like part of the surround.