Hampshire · England
External Mastic in Up Somborne
Sealing brickwork movement joints, render, cladding and façade joints for householders, landlords and businesses in Up Somborne. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Rain getting behind render or cladding at a joint
- Plants rooting in failed movement joints
- Sealant pulling away from one side of the joint
Up Somborne: your questions answered
Is there a guarantee on external mastic in Up Somborne?
All our work, in Up Somborne and everywhere else, comes with a 12-month guarantee. We’re fully insured, and an ARBOMaster approved applicator.
Can you do external mastic in Up Somborne?
Yes, Up Somborne is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or send us an email and let us know what needs doing, and we will send you a clear quote.
Do you remove the old sealant?
Always. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Is it OK to seal over old sealant?
No, it won’t last. It may look fine at first, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
What do you put in the joint?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
Do you work for landlords and businesses?
Yes, often. Several properties can be quoted together.
Is there any odour?
Some sealants have a smell while they cure, but it fades. Opening a window helps.
Why do you put foam in the joint first?
Backing rod controls the sealant depth and keeps it off the back of the joint. Then the sealant bonds to two faces and can move.
External mastic in Up Somborne, done properly
Ground-floor and low-level joints are straightforward to reach. For joints higher up, give us some details of the building and we will confirm what access is needed. Common call-outs are for movement joints filled with mortar instead of sealant and failed sealant between panels on a façade, across façade panels, joints between brick and frames and brickwork movement joints.
Older homes in small places like Up Somborne may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water generally gets in, and they need the right sealant at the right depth.
Every job is covered by our 12-month guarantee.
- Where
- Up Somborne (SO20)
- Wider area
- Hampshire
- Cover
- One year on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
How it works
A visit follows a simple pattern: we look at the joints together, mask and protect the surrounding surfaces, do the work and tidy away. Most jobs take a few hours for a handful of joints, longer for a whole elevation. Somewhere like Up Somborne needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- The old mastic and anything lodged in the joint is removed.
- Both sides are cleaned back to sound material and primed if needed.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Getting ready for the visit
- Plan for the work area to be out of bounds to pets and children
- Try not to wet indoor joints just before the visit
- Let us know about parking restrictions
Ask for a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Advice
How the job changes by surface
Render joints
Render is weaker at the surface than brick, so a low-modulus sealant is kinder to the joint edges. We prime where the product needs it.
Concrete and blockwork
Blockwork and concrete shrink over time and move with the seasons. Their movement joints are sealed over backing rod with a flexible sealant.
What affects the quote in Up Somborne
For a quick quote, just ask. The main things that affect it are:
- The amount of work
- How many rooms, windows or areas are involved
- Any working-time requirements on site
- Whether the work is at height
The cost reflects the work involved, not guesswork. That’s why we ask about the job first and send you a clear quote before any work starts.
What to tell us for a quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- The type of property
- Any access issues, like height or stairs
- Whether it has been sealed before
- Roughly how big the job is
Want a quote for external mastic? Please ring 0345 464 0079 or send us an email with a few details. We will explain what we’d do and send you a clear quote before any work starts.
Signs you need external mastic in Up Somborne
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, and it tears off the sides.
Signs it’s time to call us include:
- Sealant pulling away from one side of the joint
- Weathered mastic that no longer stretches
- Failed seals between different materials
- Weeds or debris growing in open joints
Around Up Somborne, as everywhere, external mastic is only as good as the preparation behind it.
What your quote should include
- Which sealant they’ll use, and why
- Whether all the old sealant comes out first
- Is VAT in the price?
- Whether you can choose the colour
Landlord and commercial work in Up Somborne
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Housing providers, facilities teams and property managers book us too in Up Somborne and across Hampshire. We can quote a run of properties together.
Why it’s worth doing now in Up Somborne
Water gets in through a failed movement joint, behind render and cladding. Resealing early keeps the job to the joint itself, rather than the wall around it. Older cottages and farmhouses around Up Somborne can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
What it costs depends on how much there is to do, how much old material has to come out and how easy the joints are to reach. You will have a clear quote before any work starts, so you know where you stand.
What you get with us
- We never seal over old sealant
- Fully insured
- Every job guaranteed for a year
- Homes, businesses and hotels
See what affects the cost and what customers say.
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Never let anyone fill a movement joint with mortar
- Keep high-pressure jets off the joints
- Ask before painting over external sealant
- Keep water from gutters off the wall
Make sure anyone working on the wall later knows where the movement joints are. They should be kept open and resealed, not filled.
Small splits are the time to act. Then it’s a straightforward cut-out and reseal.
Nearby places to Up Somborne
More services for Up Somborne
Walls and rooflines in Up Somborne
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.
Homes close to All Saints Church include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move.
Up Somborne is about 5 miles north-west of Winchester, in Hampshire. If you need external mastic in Up Somborne, it’s easy to get a quote: please call 0345 464 0079 or email us. We cover Hampshire from our Crawley base. Up Somborne is one of 683 places in Hampshire we cover for external mastic. Southampton is on our list too, around 12 miles away.
Here we cover the SO20 postcode area for external mastic. Local streets include Court Lane and Up Somborne Lane. Close by, we work in Little Somborne (1 mile west), Ashley (1 mile south-west), King's Somborne (2 miles south-west), Lower Slackstead (4 miles south) and Braishfield (5 miles south). Further out, we also cover Winchester (5 miles south-east), Eastleigh (9 miles south-east), Andover (9 miles north), Totton (12 miles south), Chandler's Ford (8 miles south) and Hedge End (13 miles south-east).
Local landmarks in Up Somborne
A little further out are Royal Hampshire County Hospital (4.9 miles south-east).