Hampshire · England
External & façade joints in Holbury, Hampshire
External mastic for Holbury, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Sealant that has lost its bond to the brick or render
- Moss and dirt in joints with no sealant left
- Leaking joints around cladding and façade panels
Leave it or put it right?
Running new sealant over the old bead rarely lasts. The new layer can’t bond properly to old, weathered material, so we always take the old sealant out. In an older home around Holbury, damp from a failed joint can get into timber and plaster, which is far harder to put right than the sealant itself.
What it costs depends on how much there is to do, how much old material has to come out and how easy the joints are to reach. You will have a clear quote before any work starts, so you know where you stand.
Why choose Mr Mastic in Holbury
- One-year guarantee on every job
- An ARBOMaster approved applicator
- Rated 4.9 stars on Google
- A choice of colours where the product allows
Take a look at our cost guide or customer reviews.
How we handle external mastic in Holbury
A movement joint is only as good as its depth. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, so it bonds to the two sides only and can stretch. 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 and around Holbury, older properties sit alongside newer ones, each with its own outside joints. Older gutters and trims need their joints resealed; newer brick and render need their movement joints kept sound.
The work is covered for a year after we finish. If there’s a problem with it, please phone 0345 464 0079 or drop us an email.
- Where
- Holbury (SO45)
- Wider area
- Hampshire
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
DIY sealant or a professional job?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
What the job involves on each surface
Concrete and blockwork
Big joints in concrete need careful depth control. We size the backing rod to the gap and keep the sealant to the right depth.
Cladding and façade panels
Panel systems often rely on sealant between and around the panels. We reseal them with a sealant suited to the panel material.
FAQs for Holbury
Do you cover smaller places like Holbury?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Is external mastic in a coastal place like Holbury any different?
Near the sea, outside joints face more wind, rain and salt than they would inland, so the choice of sealant and the preparation matter even more. Walls facing the sea are normally the first to need attention.
Can a movement joint be filled with mortar?
No. Rigid materials cannot move with the wall, so the joint stops doing its job. If it has already been filled, we can normally cut it out and reseal it.
What should I tell you?
Only a few details: the address or postcode, what’s wrong and any access issues. After that, simply call 0345 464 0079 or drop us an email.
Can you seal over the old sealant?
No, and we never do. It may look fine at first, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
Will it make a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
How do you reach high-level joints?
Each building is different. Send us pictures and a rough idea of the height.
Can tenants book the work?
We can work for tenants, landlords or agents. Just make sure your landlord agrees.
Nearby places to Holbury
What else we do in Holbury
When it is not the sealant
To be straight with you, there are a few things sealant won’t fix:
- Render that’s blown, hollow or coming away
- Cracked brickwork or render that needs a builder or plasterer
- Subsidence or other structural problems
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think before you book.
Joints and surfaces we work on
- Façade panels
- Joints between brick and frames
- Render & cladding joints
- Copings & trims
- Concrete & block
- Brickwork movement joints
What we do, step by step
On the day, there’s very little for you to do. Show us the job and we will take it from there. The work itself takes a few hours to a few days, depending on the length of joint and the access. In a smaller place like Holbury, parking is seldom the issue; lanes, gates and long drives are worth mentioning. If the job is outside, tell us about side access and how high the joints are.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- We cut out the failed sealant and rake out any dirt or growth.
- We clean both faces of the joint and prime them where the product calls for it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
How to prepare
- Where the joints are inside, avoid wetting them before we arrive
- Keep pets and children clear of the area while we work
- Clear items away from the joints we’re working on
Ask for a quote
Want a quote for external mastic? Please ring 0345 464 0079 or drop us an email with a few details. We’ll explain what we’d do and give you a clear quote before work begins.
Read more
For landlords and businesses
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Holbury buildings and the weather
Holbury is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on movement joints and outside wall joints, especially on the side facing the sea. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Rented homes near Netley station change hands often, and split movement joints are easy to miss on a rental until damp shows inside. Beaulieu Palace House, about 2.9 miles west, is one of the historic houses in the wider area around Holbury, and older homes nearby need a sealant that suits their walls. For site and facilities teams at buildings such as Cadland Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Holbury is about 2 miles south of Hythe, in Hampshire. From the centre of Holbury to the outskirts, we cover external mastic for every kind of property, from flats and houses to offices and hotels. Holbury is one of 683 places in Hampshire we cover for external mastic. Southampton is on our list too, around 6 miles away.
Work in SO45 is quoted and booked the same way as anywhere else. If you need external mastic at a property on Beechwood Road, Park Hill Close and Pondhead Close or anywhere close by, we can help. Close by, we work in Little Holbury (1 mile north-west), Roughdown (1 mile south), Hardley (1 mile north), Blackfield (1 mile south-east) and Langley (1 mile south). Within a short drive, we also cover Gosport (10 miles east), Eastleigh (10 miles north), Fareham (8 miles east), Totton (8 miles north-west), Chandler's Ford (11 miles north) and Hedge End (7 miles north-east).
Around Holbury
We work in homes and buildings around The New Forest Academy and the streets around them. Holbury’s nearest station is Netley station, about 3.8 miles north-east. Other landmarks nearby include Beaulieu Abbey And Display Of Monastic Life (3.1 miles west) and Calshot Castle (3.4 miles east). Open spaces near Holbury include Mercury Marshes.
What affects the quote in Holbury
Some jobs are bigger than they look, and some smaller. The main factors:
- The amount of work
- Access and height
- How much old sealant there is and how hard it is to remove
- Which sealant suits the joint
What you pay reflects the work, not guesswork. That’s why we ask a few questions first and agree the price before starting.
Helping us quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- If it’s domestic, commercial or a hotel
- What the problem is, such as mould, gaps, leaks or cracking
- Any previous sealing or DIY work
- Where the property is
Getting a quote is simple: tell us what needs doing and where, and roughly how big it is. A few photos by email make the job easier to understand, and we’ll take it from there.