Hampshire · England
Otterbourne External Mastic
Our applicators work in Otterbourne on sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly.
- Joints where the bead has come unstuck
- Hard, crazed mastic that has stopped moving
- Cracked joints where brick meets render or frames
External mastic in Otterbourne, done properly
Movement joints let brickwork, render and cladding expand and shrink without cracking. Its sealant has to flex with the building, season after season, so once it splits or hardens, the joint stops working and water gets in. If you have rain getting behind render or cladding at a joint and joints with sealant missing in places, we can put it right, on joints between brick and frames, façade panels and copings & trims alike.
Around Otterbourne, older buildings can be stone, brick or timber-framed, many with extensions added later. Where one material meets another is where water normally gets in.
Your job is guaranteed for a year, as with all our work.
- Place
- Otterbourne (SO21)
- Region
- Hampshire
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What we can’t put right
A few problems are outside what sealant work can do:
- Render that’s blown, hollow or coming away
- Walls that need new movement joints cut into them
- Rising or penetrating damp from elsewhere in the wall
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly before booking.
Joints and surfaces we work on
- Façade panels
- Render & cladding joints
- Copings & trims
- Brickwork movement joints
- Concrete & block
- Joints between brick and frames
Your questions about external mastic in Otterbourne
Can you help a landlord with a rental near Shawford station?
Yes. We work for landlords and letting agents as well as householders. You can call 0345 464 0079 or email us with the details for a clear quote.
Do you cover Otterbourne for external mastic?
Yes. Our work covers London and the South East, and Otterbourne is part of that. Just ring 0345 464 0079 or email us with a few details of the job.
Can you seal joints between render and window frames?
Yes. Joints between dissimilar materials are a big part of external work. We use a flexible sealant suited to both surfaces, primed where needed.
When will the joints need doing again?
It varies with how exposed the wall is and how much the joint moves. Signs to watch for are cracking, hardening and gaps at the edges.
Do I need to be at home?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
Can you quote for more than one area?
Yes, we can. More than one area can be quoted together.
Do you remove the old sealant?
Yes. All of the old material is cut out and the joint cleaned.
Do you do commercial work?
Yes. Commercial and hotel work is a large part of what we do. We can talk about working times when we quote.
How the visit works
When we get to you, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. After that, the work takes a few hours for a handful of joints, longer for a whole elevation. Somewhere like Otterbourne needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Preparing for the visit
- Let us know about earlier repairs to the joints
- Where the joints are inside, avoid wetting them before we arrive
- Tell us if parking is tricky
Get a quote
We quote each job on its own. Just ring 0345 464 0079 or send us an email with the details, and photos are welcome.
Related advice
Outside joints around Otterbourne
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 live in an older home near Church of St Matthew, old and new materials meet at the roofline and walls, which is where sealant earns its keep. Schools such as Otterbourne Church of England Primary School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s.
Otterbourne is about 3 miles north-east of Chandler's Ford, in Hampshire. Anywhere in SO21, our applicators can take on external mastic. Our area takes in 683 places across Hampshire, large and small. There’s also a page for Southampton, about 7 miles away.
We cover every part of SO21 for external mastic and the streets around it. That includes homes and businesses on Oakwood Avenue, Meadowcroft Close and Brooklyn Close. If you are just outside Otterbourne, we cover South Down (1 mile north-east), Compton (1 mile north), Shawford (1 mile north-east), Twyford (1 mile north-east) and Ladwell (2 miles west). We also work in nearby towns such as Winchester (4 miles north), Eastleigh (3 miles south), Fareham (13 miles south-east), Andover (15 miles north-west), Totton (9 miles south-west) and Chandler's Ford (3 miles south-west).
Landmarks near Otterbourne
In Otterbourne, that means homes and buildings near Thornden School, The White Horse Public House and Thornden School and the streets around them. The closest station to Otterbourne is Shawford station, roughly 1.1 miles north-east. Well-known places in the area include Eastleigh Museum (2.9 miles south) and Wolvesey Castle (3.8 miles north). Not far away are Twyford Down and Shawford Down.
Nearby places to Otterbourne
Other services in Otterbourne
Aftercare tips
After the cure time, these simple habits help:
- Get split or bare joints resealed while the damage is small
- Keep soil, plants and ivy away from the joints
- Ask before painting over external sealant
- Tell anyone working on the walls about the movement joints
Avoid pressure-washing straight into the joints. High-pressure water can lift the edges over time.
Leaks behind façade panels and render often go unseen. By the time there’s a damp patch, the damage can be well established.
Why act early in Otterbourne
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That protects surfaces like brick, render and concrete. Too stiff a sealant can pull at the edges and break them. Older cottages and farmhouses around Otterbourne can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed. Call for a quick quote and we’ll explain what it covers.
Why us?
- White, clear, grey or another colour, product permitting
- You choose the colour before work begins
- Tidy, careful work
- Old sealant always removed completely
Read how sealant jobs are priced and customer reviews.
When to call us in Otterbourne
Poor preparation causes many early failures: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The sealant never bonds properly.
Most people get in touch after spotting something like this:
- Failed sealant between panels on a façade
- Water getting into walls through failed joints
- Moss and dirt in joints with no sealant left
- Movement joints with cracked, split or missing sealant
Rented homes near Shawford station change hands often, and split movement joints are easy to miss on a rental until damp shows inside.
Comparing quotes
- Is VAT in the price?
- What preparation is included
- Are they insured?
- Whether they seal over old material or remove it
How we quote for external mastic
Your quote is based on your job. We take into account:
- The old material and how stubborn it is
- The type of sealant required
- How much there is to do
- Any working-time requirements on site
What it costs depends on the size of the job, how hard the old material is to remove and access to the work. We give a clear quote before any work starts, so you know where you stand.
Helping us quote
Photos by email are helpful but not essential. Try to tell us:
- If it’s domestic, commercial or a hotel
- Any access issues, like height or stairs
- Any previous sealing or DIY work
- What the problem is, such as mould, gaps, leaks or cracking
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we will explain how we’d tackle it. Whenever you are ready, phone 0345 464 0079 or drop us an email.
DIY versus a professional finish
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.