Hampshire · England
Catherington External Mastic
Movement joints in Catherington need attention? We cut out the old, prepare the joints and apply the right sealant, with a 12-month guarantee.
- Leaking joints around cladding and façade panels
- Rain getting behind render or cladding at a joint
- Joints where the bead has come unstuck
How we handle external mastic in Catherington
Getting the depth right is half the job. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, so it bonds to the two sides only and can stretch. We work on concrete & block, façade panels and copings & trims, and the jobs we see most are joints pointed up with cement by mistake and damp patches traced to an open external joint.
External sealant needs dry, clean surfaces, so work around Catherington is planned for dry weather. Tell us about access to all sides of the building, including outbuildings and garages.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we will put it right.
- Location
- Catherington (PO8)
- Region
- Hampshire
- Cover
- One year on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What external mastic looks like in Catherington
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Schools such as Catherington Church of England Infant School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s. For an older house near a landmark such as Church of All Saints, older walls, gutters and the joints where extensions meet them need a flexible sealant. For landlords with property near Rowlands Castle station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Catherington is about 2 miles north of Horndean, in Hampshire. For external mastic in and around Catherington, please phone 0345 464 0079 or email us for a quick quote. We cover Hampshire from our Crawley base, Catherington included. Across Hampshire, we cover 683 places, and Catherington is one of them. We also work in Portsmouth, around 9 miles away.
We cover every part of PO8 for external mastic. Streets in the area include Glamorgan Road, Wrexham Grove and White Dirt Lane. Other places close to Catherington include Clanfield (1 mile north), Lovedean (2 miles south-west), Horndean (2 miles south), Wecock Farm (2 miles south-west) and Anmore (3 miles south-west). Larger places within reach include Gosport (11 miles south-west), Havant (5 miles south), Eastleigh (15 miles west), Fareham (10 miles south-west), Alton (15 miles north) and Hedge End (13 miles west).
Landmarks near Catherington
Around Catherington, our work takes us to homes and buildings near Horndean Technology College, among other places. Catherington’s nearest station is Rowlands Castle station, roughly 3.5 miles south-east of the centre. Well-known places in the area include Havant War Memorial Hospital (5.3 miles south) and Clanfield Earthwork (1.7 miles north-east). For a walk, there’s Windmill Hill.
When something else is needed
We’d rather tell you now than do work that will not last, so here’s what sealant cannot put right:
- Cracking across the wall rather than at a joint
- Cutting new joints into brickwork, which is building work rather than sealant work
- Subsidence or other structural problems
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly.
Where we work in Catherington
- Copings & trims
- Joints between brick and frames
- Render & cladding joints
- Façade panels
- Concrete & block
- Brickwork movement joints
Landlords, agents and businesses in Catherington
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
We regularly work with letting and managing agents. Tell us the address, the job and how access works.
Aftercare tips
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Have failed joints looked at early
- Wash walls gently around the sealant
- Tell anyone working on the walls about the movement joints
- Fix overflowing gutters above sealed joints
Keep pressure washers away from the sealant. A strong jet can damage the edges of the bead and let water in behind.
Act while the splits are small. Then it’s a straightforward cut-out and reseal.
DIY sealant or a professional job?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
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, then guaranteed for a year.
How the visit works
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. Most jobs then take a few hours to a few days, depending on the length of joint and the access. In a small place like Catherington, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- Clear items away from the joints we are working on
- On commercial sites, let us know about site rules
- Let us know if you’ve seen damp or leaks
How to get a quote
There’s no standard price list, because every job is different. Instead, we send you a clear quote for your job. To get started, phone 0345 464 0079 or email us.
Read more
Other services in Catherington
FAQs for Catherington
Can you do external mastic in Catherington?
Yes. Our work covers London and the South East, and Catherington is part of that. You can ring 0345 464 0079 or email us and let us know what needs doing, and we’ll send you a clear quote.
Do you cover smaller places like Catherington?
Yes, we do. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Will you leave a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
What do you put in the joint?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Will there be a smell?
Possibly a little. Any smell clears as the sealant cures, and ventilation helps.
Do you remove the old sealant?
Yes, always, and completely. New silicone doesn’t stick to old silicone, so any old material comes out before anything new goes in.
I’m a tenant. Can you help?
We can work for tenants, landlords or agents. Just make sure your landlord agrees.
Do you do commercial work?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. Working times can be discussed when we quote.
How the job changes by surface
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. That movement goes into the joint, so its sealant has to stay flexible.
Cladding and façade panels
Cladding and façade panels are generally separated by sealed joints. We reseal them with a sealant suited to the panel material.
Quotes for external mastic in Catherington
Your quote is based on your job. We look at:
- The amount of work
- The number of rooms or windows
- Whether old sealant or filler has to be cut out
- Any working-time requirements on site
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 send us an email and we will give you an honest view and a quote.
Helping us quote
Photos help, but a description is a good start. Try to tell us:
- Whether it has been sealed before
- How we’d reach the joints
- If it’s domestic, commercial or a hotel
- A few pictures by email, if you can
Call for a quick quote, or email us if that’s easier. Describe what needs sealing and we’ll talk you through the work before giving you a price.