Hampshire · England
External Mastic in Carter's Clay
Specialist external mastic for Carter's Clay: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Moss and dirt in joints with no sealant left
- Weathered mastic that no longer stretches
- Joints with sealant missing in places
About our external mastic in Carter's Clay
Failed sealant is cut out, the depth set with closed-cell backing rod, and the joint resealed with a low-modulus sealant made for outside. We pick a colour that sits well with the wall so the line blends in. We work on façade panels, render & cladding joints and brickwork movement joints, and common reasons people get in touch are rigid filler in a joint that should flex and leaking joints around cladding and façade panels.
Somewhere as small as Carter's Clay, homes and farm buildings often face open ground, where walls and rooflines take the weather head on. Gutter joints and wall joints there need a sealant that can flex and stay put.
All our work is covered by our 12-month guarantee, wherever you are in Hampshire.
- Place
- Carter's Clay (SO51)
- Region
- Hampshire
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What happens if it’s left?
An open joint keeps letting water into the wall with every downpour. In cold weather, frost can damage wet brick and render around the joint, so the problem grows beyond the joint itself. Older cottages and farmhouses around Carter's Clay can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
What you pay reflects the work, not guesswork. That is why we ask about the job first and agree the price before starting.
Why us?
- We are fully insured
- 4.9 on Google from 180+ five-star reviews
- Trusted Arbo and Everbuild sealants
- Colour agreed with you before work begins
Read what affects the cost and our reviews.
DIY sealant or a professional job?
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
How to look after the new joints
No joint lasts for ever, but care makes a real difference. A few tips:
- Keep water from gutters off the wall
- Keep movement joints as flexible joints, not mortar
- Keep soil, plants and ivy away from the joints
- Tell anyone working on the walls about the movement joints
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They must stay as flexible joints, never rendered or pointed over.
A joint that has stopped moving pushes the movement elsewhere, normally as cracking in the brickwork or render nearby. Catch it early and you reduce the risk.
Outside joints around Carter's Clay
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Mottisfont Abbey (about 1.9 miles north-east) nearby, there’s older building stock in the area around Carter's Clay as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
Schools such as Awbridge Primary School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s. For landlords with property near Mottisfont & Dunbridge station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. Mottisfont Abbey, about 1.9 miles north-east, is one of the historic houses in the wider area around Carter's Clay, and older homes nearby need a sealant that suits their walls.
Carter's Clay is about 4 miles north-west of Romsey, in Hampshire. Carter's Clay gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. We cover 683 towns and villages across Hampshire. There’s also a page for Southampton, roughly 10 miles from Carter's Clay.
Work in SO51 is quoted and booked the same way as anywhere else. We cover properties on The Banks and Carter's Clay Road. Neighbouring places we cover for external mastic include Lockerley (1 mile north-west), Awbridge (1 mile south-east), Dunbridge (1 mile north-east), Kimbridge (2 miles north-east) and Sherfield English (2 miles south-west). Further out, we also cover Winchester (11 miles east), Eastleigh (10 miles east), Andover (14 miles north), Totton (7 miles south), Chandler's Ford (8 miles east) and Hedge End (13 miles south-east).
Landmarks near Carter's Clay
We work in homes and buildings around Kings Arms Public House, among other places. Carter's Clay’s nearest station is Mottisfont & Dunbridge station, about 1.2 miles north-east. Other landmarks nearby include Romsey Community Hospital (4 miles south-east) and King Johns House (3.4 miles south-east).
What affects the quote in Carter's Clay
The price is agreed before any work begins. It takes into account:
- Whether there’s mould to deal with
- The old material and how stubborn it is
- How many areas need sealing
- The number and length of the joints
Leaving a failed joint usually makes the job bigger, not smaller, because water and mould keep working on it. If you’re not sure whether it needs doing, ring 0345 464 0079 or drop us an email for an honest opinion and a quote.
Helping us quote
Before you ask for a quote, have a think about:
- Any access issues, like height or stairs
- Whether it’s a home or a business
- Roughly how big the job is
- Photos by email, if that’s easy
Asking for a quote is easy: let us know the job and the location. A few photos by email make the job easier to understand, and we will come back to you with a quote.
Common questions in Carter's Clay
Is Carter's Clay in your area for external mastic?
Yes. We work across London and the South East, and Carter's Clay is part of that. Just call 0345 464 0079 or email us with a few details of the job.
Will you come out to Carter's Clay?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Can a movement joint be filled with mortar?
No. Rigid materials cannot move with the wall and the joint fails. If it has already been filled, we can usually cut it out and reseal it.
Do I have to be there?
We need access to the joints, so we will agree that with you when we book. Indoors, that generally means someone at home.
What information do you need?
A short description and the location, with pictures by email if possible. If we need more, we will ask.
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.
Where do you work from?
We work from Crawley. We cover Carter's Clay and the rest of Hampshire, along with the rest of our area.
Will it make a mess?
No. The area is protected while we work and cleaned up afterwards.
Nearby places to Carter's Clay
Other services in Carter's Clay
Honest limits
Sealant is not the answer to every problem, and we’d rather say so up front. Sealant won’t put right:
- Failed render or damaged cladding panels
- Cracking across the wall rather than at a joint
- Damp that is not coming from the joint
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly.
What we seal
- Render & cladding joints
- Façade panels
- Concrete & block
- Brickwork movement joints
- Joints between brick and frames
- Copings & trims
Surface by surface
Cladding and façade panels
Where a cladding system has its own specified sealant, we follow it, or one the system allows. Tell us what the building has when you get in touch.
Render joints
The face of render can be soft, so a sealant that stretches easily protects the edges. Priming is done where the sealant calls for it.
The process
All our tools and materials come with us in the van, so you do not need to buy or prepare anything. Once we have agreed what’s being done, we protect the area and start. It normally takes anything from a few hours to several days, depending on the building. For a village or hamlet like Carter's Clay, 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.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- 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.
How to prepare
- Clear items away from the joints we’re working on
- Tell us about access, such as stairs, a lift or high-level joints
- On commercial sites, let us know about site rules
Get a quote
Need a quote? Please call 0345 464 0079 or drop us an email with a few details. You will know what we plan to do, and what it will cost, before any work begins.