Hampshire · England
External Mastic in Colbury
Professional external mastic in and around Colbury, with old sealant always removed completely and a 12-month guarantee.
- Failed sealant between panels on a façade
- Sealant pulling away from one side of the joint
- Moss and dirt in joints with no sealant left
External mastic for homes and businesses in Colbury
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Some surfaces need a primer before sealing, and we do not skip that step. If you have joints where the bead has come unstuck and old sealant gone brittle and cracked, we can put it right.
Around Colbury, older buildings can be stone, brick or timber-framed, many with extensions added later. The joints where those materials meet are the weak points.
We stand behind the work with a 12-month guarantee, so you are covered after we’ve gone.
- Location
- Colbury (SO40)
- Wider area
- Hampshire
- Cover
- One year on every job
- Quote
- A clear price before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Common problems we fix in Colbury
Using the wrong sealant is another common reason. A stiff, general-purpose sealant cannot cope with a joint that moves a lot, so it pulls away from the edges.
The problems people generally mention when they call include:
- Moss and dirt in joints with no sealant left
- Joints with sealant missing in places
- Water getting into walls through failed joints
- Hard, crazed mastic that has stopped moving
Managing a site like Foxhills Infant School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Questions to ask before you book
- Which colour the sealant will be
- How long the guarantee is
- How the surfaces are prepared before sealing
- What happens if they find a problem under the old sealant
Leave it or put it right?
A properly done movement joint is an even line in a colour that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner so it’s worth doing right. Older cottages and farmhouses around Colbury can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
Doing several joints on one visit is generally more efficient than separate visits. You’ll get one clear quote for the whole job.
Why book with us
- 4.9 on Google from 180+ five-star reviews
- Sealant colour chosen to suit
- Sanitary silicone with an anti-fungal additive in wet areas
- Over 20 years’ experience
Take a look at what affects the cost and customer reviews.
Colbury: your questions answered
Does living near the coast affect external mastic in Colbury?
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. It’s worth checking the walls that face the sea first.
Is Colbury within the area you cover?
Yes. Colbury is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can landlords and businesses book you?
Yes. As well as homeowners, we work for landlords, agents, businesses and hotels.
Do you do commercial work?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. Working times can be discussed when we quote.
When is the sealant fully cured?
Most sealants are touch-dry well before they’re fully cured. We will tell you how long to leave the joint before we leave.
Can a movement joint be filled with mortar?
No, not where the gap is a movement joint. Filling it with mortar defeats its purpose and can lead to cracking. A flexible sealant is the right fill.
How long will you be here?
As a guide, most jobs take anything from a few hours to several days, depending on the building. Bigger jobs take longer, and we will say how long yours will take.
What should I tell you?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
How to look after the new joints
Aftercare is simple, and it makes a real difference:
- Point out the joints to other trades
- Ask before painting over external sealant
- Have failed joints looked at early
- Wash walls gently around the sealant
Follow the cure time we give you before the joint is knocked or disturbed. The surface skins over quickly, but full cure takes longer.
Water getting behind cladding or render can go unnoticed for a long time. By the time there’s a damp patch, the damage can be well established.
The process
Once we are on site, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. After that, the work takes a few hours to a few days, depending on the length of joint and the access. For a village or hamlet like Colbury, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Before we arrive
- Where the joints are inside, avoid wetting them before we arrive
- Clear the area around the work
- Tell us about any water getting in
Getting a quote
For a quote, ring 0345 464 0079 or send us an email with the location and a short description of the problem. We’ll give you a clear quote before any work starts.
Advice
Different surfaces, different methods
Joints between dissimilar materials
Brick against render, concrete against metal, stone against timber: every change of material is a joint. A flexible sealant bridges the two so neither cracks the other.
Cladding and façade panels
Metal and composite panels move a lot with temperature, so the joint sealant has to cope with frequent movement. The sealant is chosen with that in mind.
When it isn’t the sealant
Sealant is not the answer to every problem, and we’d rather say so up front. It won’t solve:
- Cracks in the bricks or render themselves, away from the joints
- Loose or hollow render, which needs re-rendering
- Adding movement joints to masonry that has none
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly.
Joints and surfaces we work on
- Façade panels
- Render & cladding joints
- Brickwork movement joints
- Joints between brick and frames
- Concrete & block
- Copings & trims
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.
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.
What external mastic looks like in Colbury
Colbury is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you let a flat or house near Ashurst New Forest station, split movement joints are easy to miss on a rental until damp shows inside. If you live in an older home near Colbury Christ Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
Colbury is about 1 mile south of Totton, in Hampshire. Anywhere in SO40, we can carry out external mastic at your property. Colbury is one of 683 towns and villages in Hampshire we cover.
Every address in SO40 is covered for external mastic. Nearby, we also carry out external mastic in Ashurst (1 mile west), Lyndhurst (4 miles south-west), Emery Down (4 miles south-west), Balmerlawn (6 miles south-west) and Brockenhurst (6 miles south-west). Larger places within reach include Winchester (14 miles north-east), Eastleigh (8 miles north-east), Fareham (14 miles east), Chandler's Ford (8 miles north-east), Hedge End (9 miles east) and Lymington (10 miles south).
Landmarks near Colbury
In Colbury, that means homes and buildings near Hounsdown School and The Forest Inn. For rail, the closest station is Ashurst New Forest station, about 1.2 miles south-west. Well-known places in the area include Ashurst Hospital (1 mile south-west) and National Dairy Museum (under half a mile south). Green spaces nearby include Testwood Lakes.