West Sussex · England
Selham External Mastic
External mastic for Selham and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Joints where the bead has come unstuck
- Joints pointed up with cement by mistake
- Brick movement joints where the sealant has split
Work for landlords, hotels and businesses
We also work for property managers and facilities teams. Several sites can be quoted together.
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
External mastic in Selham
Many failed façade joints only get noticed once there’s a stain or a damp patch inside. We look over the joints, agree the ones to renew and reseal with a flexible, weatherproof product in a colour to suit. If you’re dealing with water getting into walls through failed joints and failed sealant between panels on a façade, we can put it right.
In a village or hamlet like Selham, older cottages and farm buildings often stand in the open, so walls and rooflines take the full force of wind and rain. Joints on those walls need a sealant that moves with the building and stays in place.
All of our work is guaranteed for twelve months, in Selham and everywhere else we cover.
- Location
- Selham (GU28)
- Wider area
- West Sussex
- Guarantee
- One year on every job
- Quote
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Selham: your questions answered
Do you cover smaller places like Selham?
Yes. Selham is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can you do external mastic in Selham?
Yes. Our work covers London and the South East, and Selham is part of that. You can phone 0345 464 0079 or send us an email and let us know what needs doing.
How long does the job take?
Most jobs take a few hours to a few days, depending on the length of joint and the access. We will confirm how long when we quote.
Can you work on commercial sites?
Yes. We work in offices, washrooms, hotels and other commercial premises. Working times can be discussed when we quote.
What should I tell you?
Just the basics: the address or postcode, what’s wrong and any access issues. After that, simply call 0345 464 0079 or email us.
Can you match the colour of my brickwork?
The aim is a neat, even joint in a colour that suits the wall. Colour is agreed with you before we begin from the range available.
What does external mastic cost?
Size, access and the old material all affect the cost. Call for a quick quote and we will talk you through it.
Do I have to be there?
We need access to the joints, so we will agree that with you when we book. For inside work, that normally means someone being in.
What external mastic looks like in Selham
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. 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. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
In and around Selham, as anywhere, good external mastic starts with a clean, dry, properly prepared joint.
Selham is about 8 miles south of Haslemere, in West Sussex. From the centre of Selham to the outskirts, external mastic is available for homes and businesses alike. Selham is one of 371 towns and villages in West Sussex we cover for external mastic. You can also see our page for Portsmouth, roughly 21 miles from Selham.
We work across the GU28 postcode area for external mastic. We also cover 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).
Landmarks near Selham
Well-known places in the area include Midhurst Community Hospital (2.9 miles west) and Coultershaw Heritage Site (2.5 miles east). For a walk, there’s Graffham Common.
What we are called out for in Selham
If plants are growing out of a joint, the sealant has usually failed or was never there. Dirt and roots then trap moisture in the joint and make things worse.
People generally contact us when they notice something like this:
- Rigid filler in a joint that should flex
- Weeds or debris growing in open joints
- Rain getting behind render or cladding at a joint
- Old sealant gone brittle and cracked
Homes close to Church of St James include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move.
Questions to ask before booking
- How long the guarantee is
- Who does the work, and how experienced they are
- How the colour is chosen
- When the joint can take water or movement
When it isn’t the sealant
In fairness, some problems need a different trade:
- Damp that isn’t coming from the joint
- Walls that need new movement joints cut into them
- Subsidence or other structural problems
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly.
Where we work in Selham
- Render & cladding joints
- Brickwork movement joints
- Façade panels
- Copings & trims
- Concrete & block
- Joints between brick and frames
Why deal with it now?
Done well, a resealed joint is a neat, straight line that suits the wall. A rushed bead with no backing looks untidy and doesn’t last so it’s worth doing right. Where a wall is exposed, as many are in small places like Selham, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
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. Your quote takes all of that into account.
Why choose Mr Mastic in Selham
- A sealant colour to suit the surroundings
- White, clear, grey or coloured to suit, where the product allows
- Tidy, careful work
- Anti-fungal sanitary silicone in wet areas
Read how sealant jobs are priced or our reviews.
Nearby places to Selham
What else we do in Selham
Different surfaces, different methods
Render joints
Rendered walls have joints at beads, openings and changes of material. They’re resealed in a sealant that suits the render.
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. They’re resealed over backing rod with a low-modulus sealant in a colour to suit the brick.
How it works
There’s no need to move everything out before we come, only the area right around the joints. We protect the rest, and the job takes anything from a few hours to several days, depending on the building for a typical job. Somewhere as small as Selham, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
Preparing for the visit
- Plan for the work area to be out of bounds to pets and children
- For business premises, tell us about site rules or sign-in
- Tell us about access, such as stairs, a lift or high-level joints
Get a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we will talk you through the work before giving you a price.
Related advice
Should I try it myself first?
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.