Hampshire · England
Cadnam External Mastic
External mastic for Cadnam and the surrounding area: careful preparation, the right product and tidy work. Call for a quick quote.
- Brick movement joints where the sealant has split
- Movement joints filled with mortar instead of sealant
- Failed seals between different materials
About our external mastic in Cadnam
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible sealant bridges the two where mortar or filler would crack. Typical jobs include movement joints filled with mortar instead of sealant and water getting into walls through failed joints, on brickwork movement joints, render & cladding joints and copings & trims.
Somewhere as small as Cadnam, homes and farm buildings often face open ground, 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 our work comes with a 12-month guarantee, wherever you are in Hampshire.
- Location
- Cadnam (SO40)
- Region
- Hampshire
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What sealant work cannot fix
A few problems are outside what sealant work can do:
- Adding movement joints to masonry that has none
- Movement that is more than a sealant joint can take
- Cracks in the bricks or render themselves, away from the joints
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
- Brickwork movement joints
- Copings & trims
- Joints between brick and frames
- Concrete & block
- Render & cladding joints
How we quote for external mastic
The quote reflects the job in front of us. We look at:
- The number and length of the joints
- The number of rooms or windows
- How easy the joints are to reach
- The product the joint needs
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
Helping us quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- What’s wrong with the joints now
- Photos by email, if that is easy
- The rough size of the job
- Access, such as stairs, a lift or height
There’s no standard price list, because every job is different. Instead, we send you a clear quote for your job. To get started, ring 0345 464 0079 or email us.
Outside joints around Cadnam
Historic houses like Landford Manor (about 4.6 miles north-west) are a reminder that the area around Cadnam has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Rented homes near Ashurst New Forest station change hands often, and split movement joints are easy to miss on a rental until damp shows inside. In the older streets around Church of St Mary, an extension built onto an older house moves differently, and the joint between them takes the strain. Schools such as Bartley Church of England Junior School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
Cadnam is about 3 miles west of Totton, in Hampshire. For external mastic in and around Cadnam, please phone 0345 464 0079 or send us an email for a quick quote. We are based in Crawley and cover Hampshire, Cadnam included. Across Hampshire, we cover 683 places, Cadnam among them. You can also see our page for Southampton, about 8 miles away.
Jobs for external mastic in SO40 works the same way as everywhere else we cover. You’ll find streets such as Old Lyndhurst Road, White Hart Lane and Southampton Road. If you are just outside Cadnam, we cover Wittensford (1 mile west), Bartley (1 mile south-east), Copythorne (1 mile north-east), Newbridge (1 mile north) and Winsor (1 mile east). Larger places within reach include Winchester (15 miles north-east), Eastleigh (11 miles east), Totton (3 miles east), Chandler's Ford (9 miles north-east), Hedge End (12 miles east) and Lymington (11 miles south).
Near you in Cadnam
Around Cadnam, our work takes us to homes and buildings near The White Hart pub and the streets around them. The nearest railway station is Ashurst New Forest station, roughly 3.1 miles south-east of the centre. Other landmarks nearby include Tatchbury Mount Hospital (2.2 miles east) and National Dairy Museum (3.6 miles south-east). Open spaces near Cadnam include Copythorne Common.
How the job changes by surface
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.
Render joints
Rendered walls have joints at beads, openings and changes of material. They’re resealed in a sealant that suits the render.
Leave it or put it right?
The longer a joint stays open, the more water the wall takes in. In cold weather, frost can damage wet brick and render near the open joint, so the damage spreads beyond the joint. Older cottages and farmhouses around Cadnam can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. You will know the price before we begin.
Why Cadnam clients choose us
- Domestic, commercial and hotel work
- 4.9 on Google from 180+ five-star reviews
- Full insurance on every job
- Sealant colour chosen to suit
Also near Cadnam
More services for Cadnam
Landlord and commercial work in Cadnam
Landlords and letting agents in Cadnam can book us as well as homeowners. Resealing between tenancies keeps a property looking cared for before the next move-in.
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Aftercare tips
After the cure time, these simple habits help:
- Keep high-pressure jets off the joints
- Keep water from gutters off the wall
- Tell anyone working on the walls about the movement joints
- Get split or bare joints resealed while the damage is small
Keep the joints clear of soil, plants and climbing growth. Anything that holds water against the joint wears it out sooner.
Small splits are the time to act. Then it’s a straightforward cut-out and reseal with no damage behind it to deal with.
How it works
We bring everything the job needs with us, so there’s nothing for you to buy. Once we’ve agreed what’s being done, we protect the area and start. It normally takes a few hours for a handful of joints, longer for a whole elevation. For a village or hamlet like Cadnam, 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.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
How to prepare
- For indoor joints, keep the area dry beforehand if you can
- Clear items away from the joints we are working on
- Tell us about access, such as stairs, a lift or high-level joints
How to get a quote
Asking for a quote is easy: tell us what needs doing and where. A few photos by email make the job easier to understand.
Related advice
Common questions in Cadnam
Do you work for landlords with property near Ashurst New Forest station?
Yes, rental work is part of what we do. Just call 0345 464 0079 or email us and tell us about the property, and we will send you a clear quote.
Do you cover Cadnam for external mastic?
Yes. Our work covers London and the South East, and Cadnam is part of that. Just phone 0345 464 0079 or email us with a few details of the job.
Will the old sealant be removed?
Yes. We cut out all the old sealant and clean the joint.
Does someone need to be in?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
Are you insured?
Yes. We are fully insured.
Why do you put foam in the joint first?
The foam is closed-cell backing rod. It keeps the sealant at the right depth and bonded to the sides only, which would stop it stretching.
Will the new joint stand out?
The aim is a neat, even joint in a colour that suits the wall. We will talk through colour options before work begins.
When will the joints need doing again?
It varies from wall to wall: sunny, exposed elevations and busy joints wear faster. A yearly look will tell you when they need doing. Our work comes with a 12-month guarantee.