Hampshire · England
External Mastic in Upper Swanmore
Movement joints in Upper Swanmore need attention? We remove the old material, prepare the joints and seal them properly, with a one-year guarantee.
- Gaps where render, brick and frames meet
- Sealant that has lost its bond to the brick or render
- Damp patches traced to an open external joint
Leave it or put it right?
A failed movement joint lets water into the wall and can run behind render or cladding. Dealing with it early keeps the repair to the joint, rather than the wall around it. Around Upper Swanmore, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
Combining jobs into one visit usually makes better use of the time than several visits, so tell us about everything that needs sealing. You will get one clear quote for the whole job.
Why choose Mr Mastic in Upper Swanmore
- You choose the colour before work begins
- We never seal over old sealant
- Fully insured
- Anti-fungal sanitary silicone in wet areas
Read what affects the cost and our reviews.
External mastic in Upper Swanmore, done properly
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Porous or awkward surfaces are primed where the sealant needs it and we use one wherever it does. If you’re dealing with sealant pulling away from one side of the joint and joints with sealant missing in places, we can put it right.
In a village or hamlet like Upper Swanmore, older cottages and farm buildings often stand in the open, where walls and rooflines take the weather head on. Joints on those walls need a sealant that moves with the building and stays in place.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Place
- Upper Swanmore (SO32)
- Wider area
- Hampshire
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
How the visit works
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. For most jobs that takes anything from a few hours to several days, depending on the building. In a small place like Upper Swanmore, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First we look over the joints with you, agree which to renew and talk through access.
- We cut out the failed sealant and rake out any dirt or growth.
- Both sides are cleaned back to sound material and primed if needed.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Getting ready for the visit
- Let us know about parking restrictions
- Clear the area around the work
- Let us know about earlier repairs to the joints
Get a quote
For a quote, phone 0345 464 0079 or send us an email with the location and a short description of the problem. We will give you a clear quote before any work starts.
Related advice
FAQs for Upper Swanmore
I let a flat near Botley station. Can you help?
Yes. We work for landlords and letting agents as well as householders. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we’ll give you a clear quote.
Is Upper Swanmore within the area you cover?
Yes, Upper Swanmore is covered. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
How often do external joints need resealing?
It depends on the exposure, the movement and the product. Sealant is a maintenance item, so check the joints once a year.
Do you use backing rod?
That’s backing rod, a closed-cell foam. It keeps the sealant at the right depth and bonded to the sides only.
Do I have to be there?
It depends on the job. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
Can you seal joints between render and window frames?
Yes. We cut out the old sealant, prepare both faces and reseal with a flexible exterior product. We pick a colour that works with both materials.
What colours does the sealant come in?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We pick the one that suits your wall best so it doesn’t stand out.
Why is there a gap in my brick wall?
It’s a deliberate gap that lets the wall expand and contract without cracking. It should be filled with flexible sealant, never mortar.
What we cannot put right
New sealant cannot fix everything, and we will tell you before any work starts. It won’t solve:
- Movement that is more than a sealant joint can take
- Cutting new joints into brickwork, which is building work rather than sealant work
- Cracking across the wall rather than at a joint
Not sure which it is? You can call 0345 464 0079 or send us an email and we’ll tell you honestly.
Joints and surfaces we work on
- Render & cladding joints
- Façade panels
- Concrete & block
- Copings & trims
- Joints between brick and frames
- Brickwork movement joints
Places near Upper Swanmore
Also in Upper Swanmore
How the job changes by surface
Cladding and façade panels
If the façade has a specified sealant, that’s what we use. Tell us what the building has when you get in touch.
Concrete and blockwork
The face of concrete or block is often dusty, so preparation is key. A primer goes on where the product requires one.
Walls and rooflines in Upper Swanmore
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For site and facilities teams at buildings such as Swanmore Church of England Aided Primary School, its movement joints, gutters and trims need looking after like any other building’s. Rented homes near Botley station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets.
Upper Swanmore is about 6 miles north-east of Hedge End, in Hampshire. Homes, rented property, offices and hotels in Upper Swanmore is covered for external mastic. The work is guaranteed for a year. Upper Swanmore is one of 683 places in Hampshire where we work for external mastic. We also work in Southampton, about 10 miles from Upper Swanmore.
Here we cover the SO32 postcode area for external mastic. Local streets include Vicarage Lane, Green Lane and Well Lane, and we cover them all. Close by, we work in Hill Grove (1 mile south), Swanmore (1 mile south-west), The Hangers (1 mile north-west), Droxford (2 miles north-east) and Dean (2 miles north-west). Larger places within reach include Winchester (10 miles north-west), Gosport (10 miles south), Havant (10 miles south-east), Eastleigh (8 miles west), Fareham (7 miles south) and Horndean (8 miles south-east).
Near you in Upper Swanmore
Locally, jobs take us to homes and businesses close to Swanmore College of Technology and the streets around them. The nearest railway station is Botley station, about 4.4 miles south-west. Other landmarks nearby include Bishop's Waltham Museum (1.9 miles west) and Knowle Hospital (5.1 miles south). Green spaces nearby include St Clair's Meadow and Beacon Hill.
When to call us in Upper Swanmore
The wrong product in a moving joint is a classic cause. A stiff, general-purpose sealant can’t cope with a joint that moves a lot, so it pulls away from the edges.
The most common problems we see are:
- Damp patches traced to an open external joint
- Sealant that has lost its bond to the brick or render
- Rigid filler in a joint that should flex
- Weeds or debris growing in open joints
If you live in an older home near Church of St Barnabas, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
What to look for in a quote
- Who does the work, and how experienced they are
- Whether they’re fully insured
- What happens if they find a problem under the old sealant
- Whether they seal over old material or remove it
How to look after the new joints
After the cure time, these simple habits help:
- Deal with leaking gutters that soak the joints below
- Walk round the building once a year and look at the joints
- Show decorators and builders where the movement joints are
- Wash walls gently around the sealant
Only paint over the joint if we’ve confirmed the sealant can take paint. Many exterior sealants aren’t designed to be painted and spoil the finish.
Once a joint cannot move, the wall finds another way, usually as cracking in the brickwork or render nearby. Catch it early and you reduce the risk.
Should I try it myself first?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.