Hampshire · England
External & façade joints in Gosport, Hampshire
Sealing brickwork movement joints, render, cladding and façade joints for Gosport, backed by a 12-month guarantee. Ask us for a quote.
- Movement joints with cracked, split or missing sealant
- Sealant that has lost its bond to the brick or render
- Rain getting behind render or cladding at a joint
External mastic in Gosport, done properly
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible exterior sealant takes up that movement. We work on copings & trims, render & cladding joints and brickwork movement joints, and people most often call us about leaking joints around cladding and façade panels and movement joints with cracked, split or missing sealant.
Around Gosport, outside jobs take in garage door frames, porches, gutters and trims as well as walls. Where two materials meet, they move differently, and the sealant has to allow for it.
We stand behind the work with a 12-month guarantee, so you’re covered after we have gone.
- Where
- Gosport (PO12, PO13)
- Region
- Hampshire
- Guarantee
- 12 months on all our work
- Quote
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Aftercare tips
Once the sealant has cured, a few habits help it last:
- Tell anyone working on the walls about the movement joints
- Wash walls gently around the sealant
- Keep movement joints as flexible joints, not mortar
- Don’t let climbing plants root in the sealant
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.
Act while the splits are small. Then it’s a straightforward cut-out and reseal with no damage behind it to deal with.
Places near Gosport
Other services in Gosport
Different surfaces, different methods
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. We reseal their joints with backing rod and a flexible product.
Brickwork movement joints
Clay brickwork grows slightly over its life and moves with the weather. That movement goes into the joint, so its sealant has to stay flexible.
How the visit works
The work is kept neat and contained to the area we’re working on, so you can carry on as normal. Expect the work to take anything from a few hours to several days, depending on the building, and we tell you how long to leave it before we go. A visit in Gosport needs access to the work and a place to park close by. For outside work, let us know about side access, gates and any upper-floor joints.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Getting ready for the visit
- Mention if the joints have been sealed before
- On commercial sites, let us know about site rules
- Try not to wet indoor joints just before the visit
How to get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job. Whenever you are ready, call 0345 464 0079 or email us.
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Signs you need external mastic in Gosport
Many joints fail because they were sealed too deep or with nothing behind them. If the sealant sticks to the back as well as the sides, it can’t stretch and rips as the joint opens.
Keep an eye out for any of the following:
- Moss and dirt in joints with no sealant left
- Damp patches traced to an open external joint
- Joints where the bead has come unstuck
- Joints pointed up with cement by mistake
If you look after a building such as Brockhurst Primary School, larger buildings have long runs of movement joint that eventually need resealing.
Comparing quotes
- What product goes in the joint
- Whether they’re fully insured
- How long to leave it before use
- Which colour the sealant will be
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 difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
External mastic in Gosport: local notes
Gosport is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That is hard on movement joints and outside wall joints, especially on the side facing the sea. 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.
In the older streets around St Faith's Church, an extension built onto an older house moves differently, and the joint between them takes the strain. Letting a property close to Portsmouth Harbour station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
Gosport is in Hampshire. For external mastic in and around Gosport, please phone 0345 464 0079 or drop us an email for a quick quote. We cover Hampshire from our Crawley base, Gosport included. We cover 683 towns and villages across Hampshire, from the larger towns to small villages.
We work across the PO12 and PO13 postcode area for external mastic. You will find streets such as Station Road, St Johns Square and Cockleshell Square, and we cover them all. Being close to the A32 and B3333, Gosport is easy for our applicators to reach for external mastic. We also cover the places around Gosport: Forton (1 mile south-east), Elson (1 mile north), Priddy's Hard (1 mile east), Bridgemary (1 mile north-west) and Rowner (2 miles north-west). Further out, we also cover Havant (8 miles north-east), Eastleigh (14 miles north-west), Fareham (4 miles north-west), Horndean (9 miles north-east), Hedge End (10 miles north-west) and Waterlooville (8 miles north-east). Gosport is among the bigger towns we cover in Hampshire.
Landmarks near Gosport
Locally, jobs take us to homes and businesses close to St Vincent College, Brune Park Community School and Queen's Head pub and the streets around them. For rail, the closest station is Portsmouth Harbour station, roughly 2 miles east of the centre. Well-known places in the area include Search (1.3 miles south-east) and Gosport War Memorial Hospital (0.8 miles south). For a walk, there’s Portsdown Hill and West of the River Alver.
How we quote for external mastic
We quote each job individually. This is what makes a difference:
- Working hours on commercial sites
- Access and height
- Mould in or behind the old joints
- The type of sealant required
We do not show prices on the website, because the cost depends so much on the job itself. Call for a quick quote.
What to tell us for a quote
There’s no need for technical detail. It helps if you can tell us:
- Where the property is
- If it’s domestic, commercial or a hotel
- What’s wrong with the joints now
- Access, such as stairs, a lift or height
Asking for a quote is easy: let us know what needs doing and where. A few photos by email make the job easier to understand, and we will take it from there.
Gosport questions
Do you cover Gosport for external mastic?
Yes, Gosport is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or send us an email and let us know what needs doing.
Is external mastic in a coastal place like Gosport any different?
Coastal homes put outside sealant through more weather than inland ones, so the choice of sealant and the preparation matter even more. Walls facing the sea are generally the first to need attention.
Can you reach joints on upper floors?
It depends on the building. We work on joints that can be reached safely. Tell us about the building and we will confirm what access is needed.
Can you work on commercial sites?
Yes. Commercial and hotel work is a large part of what we do. Working times can be discussed when we quote.
How much does external mastic cost in Gosport?
It depends on the job, so we quote each one individually. For a quick quote, call 0345 464 0079 or drop us an email with a short description of the job.
Can you quote for more than one area?
Yes. Several rooms, windows or areas can go on one quote.
Can you match the colour of my brickwork?
Exterior sealants are made in a range of colours, from greys and browns to whites and stone shades. We pick the one that suits your wall best so it doesn’t stand out.
Where do you work from?
Our base is Crawley, with over 20 years’ experience. Our area covers South East England, London and Scotland.
Work for landlords, hotels and businesses
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we’ll give you a quote.
We work for landlords and agents as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order.