Hampshire · England
External Mastic in Greatham
Specialist external mastic for Greatham: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Leaking joints around cladding and façade panels
- Weeds or debris growing in open joints
- Water getting into walls through failed joints
External mastic for homes and businesses in Greatham
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible exterior sealant takes up that movement where mortar or filler would crack. We work on façade panels, copings & trims and brickwork movement joints, and the jobs we see most are moss and dirt in joints with no sealant left and movement joints with cracked, split or missing sealant.
Older homes in small places like Greatham may be stone, brick or timber-framed, often with later extensions. The joints where those materials meet are the weak points, and they need the right sealant at the right depth.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Place
- Greatham (GU33)
- Region
- Hampshire
- Cover
- A year, on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
How to look after the new joints
Looking after new joints is easy, and it makes a real difference:
- Fix overflowing gutters above sealed joints
- Keep high-pressure jets off the joints
- Leave the joints unpainted unless we’ve said otherwise
- Make sure movement joints aren’t pointed over
Keep pressure washers away from the sealant. A strong jet can damage the edges of the bead.
Act while the splits are small. At that stage it’s a simple cut out and reseal with no damage behind it to deal with.
Greatham questions
Do you cover Greatham for external mastic?
Yes. We work across London and the South East, and Greatham is part of that. You can phone 0345 464 0079 or drop us an email and let us know what needs doing, and we will give you a clear price.
Do you work for landlords with property near Liss station?
Yes, landlords and agents are among the people we work for. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear quote.
What’s an expansion joint in brickwork?
Most straight vertical gaps in brickwork are movement joints. It gives the wall room to move and needs a flexible seal, not mortar.
What is backing rod for?
The foam is closed-cell backing rod. It stops the sealant going in too deep and bonding to three sides, which would stop it stretching.
Do you work for hotels and businesses?
Yes. Hotels, offices and other businesses use us and we are fully insured.
Can you match the colour of my brickwork?
We aim for a joint that suits the wall rather than one that jumps out. We’ll talk through colour options before we start from the range available.
Will it make a mess?
No. We protect the surfaces around the joints, and we clear up the old sealant and our materials before we leave.
Do you have insurance?
Yes. We’re fully insured.
Can I do it myself?
What a professional job adds is preparation and the right 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.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
Different surfaces, different methods
Brickwork movement joints
Brick movement joints are often mistaken for a missing mortar line. If that is happened, we rake it out and reseal it properly where it can be done safely.
Concrete and blockwork
The face of concrete or block is often dusty, so preparation is key. We prime where the sealant needs it.
Why act early in Greatham
The longer a joint stays open, the more water the wall takes in. Wet masonry is more easily damaged by frost around the joint, so the problem grows beyond the joint itself. Older cottages and farmhouses around Greatham can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you are unsure, ring 0345 464 0079 or email us and we will give you an honest view and a quote.
Why Greatham customers choose us
- Trusted Arbo and Everbuild sealants
- Old sealant always removed completely
- White, clear, grey or another colour, product permitting
- You choose the colour before work begins
Take a look at what affects the cost or our reviews.
What we are called out for in Greatham
Some movement joints have been pointed up with mortar, often by someone who didn’t know what it was for. The joint can’t move, so the wall cracks somewhere else instead.
Common reasons people contact us include:
- Brick movement joints where the sealant has split
- Sealant that has lost its bond to the brick or render
- Weeds or debris growing in open joints
- Old sealant gone brittle and cracked
Managing a site like Greatham Primary School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
What to look for in a quote
- What happens if they find a problem under the old sealant
- Whether the sealant suits the joint
- Who does the work, and how experienced they are
- Which colour the sealant will be
How it works
At the end, we look at the finished work together. The visit itself normally takes anything from a few hours to several days, depending on the building, depending on the size of the job. For a village or hamlet like Greatham, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- First we look over the joints with you, agree which to renew and talk through access.
- The old mastic and anything lodged in the joint is removed.
- We clean both faces of the joint and prime them where the product calls for it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Getting ready for the visit
- Tell us about any previous sealing or DIY attempts
- Mention any tricky access
- On commercial sites, let us know about site rules
Getting a quote
Want a quote for external mastic? Please phone 0345 464 0079 or drop us an email and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Related advice
Outside joints around Greatham
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
In the older streets around Church of St John the Baptist, an extension built onto an older house moves differently, and the joint between them takes the strain. If you let a flat or house near Liss station, outside joints that have cracked can let damp into a rental, so check them between lets.
Greatham is about 5 miles north-east of Petersfield, in Hampshire. Every kind of property in Greatham can book us for external mastic. Every job comes with our one-year guarantee. 683 places in Hampshire are on our list. Our Portsmouth page covers work nearby (20 miles or so).
All of GU33 is within our area for external mastic. External mastic is available to properties on Longmoor Road, Wolfmere Lane and Todmore and the roads around them. We also cover Longmoor (1 mile east), Woolmer (1 mile north), Liss Forest (1 mile south), Blackmoor (1 mile north) and The Mint (2 miles south). We also work in nearby towns such as Havant (15 miles south), Fleet (14 miles north), Horndean (13 miles south-west), Aldershot (13 miles north-east), Alton (7 miles north-west) and Waterlooville (15 miles south-west).
Local landmarks in Greatham
The closest station to Greatham is Liss station, roughly 2 miles south of the centre. Nearby you’ll also find The Romany Museum (2.9 miles north-west) and Chase Community Hospital (2.5 miles north-east). Not far away are Liss Riverside Railway Walk North and Selborne Hill.
When it isn’t the sealant
In fairness, some problems need a different trade:
- Cracks in the bricks or render themselves, away from the joints
- Structural movement, which needs a surveyor or engineer
- Cutting new joints into brickwork, which is building work rather than sealant work
If in doubt, call 0345 464 0079 or drop us an email and we’ll say what we think.
Surfaces we seal
- Façade panels
- Joints between brick and frames
- Render & cladding joints
- Copings & trims
- Concrete & block
- Brickwork movement joints