Hampshire · England
Southrope External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Southrope and across Hampshire. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Rigid filler in a joint that should flex
- Weeds or debris growing in open joints
- Cracked joints where brick meets render or frames
About our external mastic in Southrope
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, and when it fails, the wall takes the strain and water finds a way in. We work on brickwork movement joints, concrete & block and render & cladding joints, and common reasons people get in touch are joints pointed up with cement by mistake and moss and dirt in joints with no sealant left.
External sealant needs dry, clean surfaces, so work around Southrope 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 is not right with it in that time, tell us and we’ll put it right.
- Where
- Southrope (RG25)
- Region
- Hampshire
- Cover
- 12 months on all our work
- Price
- A clear price before work begins
- Call
- 0345 464 0079
- Updated
- 26 October 2026
How to look after the new joints
Good habits help new joints last longer. Our tips:
- Act on the first splits you see
- Point out the joints to other trades
- Do not let climbing plants root in the sealant
- Keep high-pressure jets off the joints
Look over the joints once a year, ideally after winter. Splits, gaps at the edges or plants in the joint are early warning signs.
Leaks behind façade panels and render often go unseen. By the time there’s a damp patch, the damage can be well established so early resealing is worth it.
Work for landlords, hotels and businesses
If you manage several properties in or around Southrope, jobs at different addresses can be quoted together. Send us the addresses and the work at each, and photos by email help.
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we’ll quote.
What we do, step by step
When we get to you, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. Most jobs then take a few hours for a handful of joints, longer for a whole elevation. Somewhere like Southrope needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
Getting ready for the visit
- Tell us about any previous sealing or DIY attempts
- Mention any leaks or damp you’ve noticed
- Keep children and pets away from the work area
Ask for a quote
Every job is quoted individually. Simply call 0345 464 0079 or drop us an email and describe the job and send photos if you have them.
Related advice
Other services in Southrope
When something else is needed
A few problems are outside what sealant work can do:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Loose or hollow render, which needs re-rendering
- Damp that isn’t coming from the joint
Not sure which it is? You can call 0345 464 0079 or send us an email and we’ll tell you honestly before you book.
Joints and surfaces we work on
- Render & cladding joints
- Concrete & block
- Copings & trims
- Façade panels
- Brickwork movement joints
- Joints between brick and frames
Southrope: your questions answered
I let a flat near Alton station. Can you help?
Yes. We work for landlords and letting agents as well as homeowners. Just ring 0345 464 0079 or drop us an email with the address and what needs doing, and we will give you a clear quote.
Is Southrope within the area you cover?
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.
Do you take out the old sealant first?
Yes, always, and completely. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
What sealant do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We will tell you what we are using and why.
What does external mastic cost?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote.
Why do you put foam in the joint first?
Backing rod controls the sealant depth and keeps it off the back of the joint. That way it bonds to the two sides only and can stretch.
Do you guarantee your work?
Yes. Each job is guaranteed for twelve months.
Can you work on commercial sites?
Yes. Commercial and hotel work is a large part of what we do. We can talk about working times when we quote.
What we’re called out for in Southrope
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.
The most common problems we see are:
- Moss and dirt in joints with no sealant left
- Old sealant gone brittle and cracked
- Sealant that has lost its bond to the brick or render
- Brick movement joints where the sealant has split
If you live in an older home near Church of St. Mary, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Questions to ask before you book
- Is VAT in the price?
- How the colour is chosen
- Whether the sealant suits the joint
- How the joint is cleaned and prepared
Can I do it myself?
If you’ve already had a go yourself, that is fine. We cut it out and start again, so just mention it when you contact us.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is.
How we quote for external mastic
The quote reflects the job in front of us. We take into account:
- The size of the job
- Access and height
- The product the joint needs
- Whether there’s mould to deal with
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we’ll explain what it covers.
Asking for a quote
Before you ask for a quote, have a think about:
- The address or postcode of the job
- Whether it has been sealed before
- The rough size of the job
- The problem you’ve noticed
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that’s easy.
Southrope buildings and the weather
With historic houses such as Hall Place (about 3.1 miles south) nearby, there’s older building stock in the area around Southrope 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. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Letting a property close to Alton station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Southrope is about 4 miles north-west of Alton, in Hampshire. If you need external mastic in Southrope, it’s easy to get a quote: please phone 0345 464 0079 or email us. We are based in Crawley and cover Hampshire, Southrope included. Southrope is one of 683 places in Hampshire we cover. You can also see our page for Reading, roughly 17 miles from Southrope.
We cover every part of the RG25 postcode area for external mastic and the streets around it. Whether your property is on King Johns Lane, Back Lane and Hockleys Lane or a nearby road, we can help. We also cover Bagmore (1 mile west), Burkham (2 miles south-west), Shalden Green (2 miles south-east), Shalden (2 miles south-east) and Bentworth (3 miles south). Within a short drive, we also cover Basingstoke (5 miles north-west), Winchester (15 miles south-west), Farnborough (14 miles north-east), Fleet (10 miles north-east), Aldershot (13 miles east) and Alton (4 miles south-east).
Landmarks near Southrope
The nearest railway station is Alton station, roughly 4.5 miles south-east of the centre. Nearby you will also find Gliding Heritage Centre (1.2 miles south-east) and Basing House (4.9 miles north). For a walk, there’s Holybourne Hill.