Hampshire · England
External & façade joints in Andover, Hampshire
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Andover and across Hampshire. Fully insured, ARBOMaster approved and guaranteed for a year.
- Plants rooting in failed movement joints
- Rigid filler in a joint that should flex
- Joints where the bead has come unstuck
Honest limits
We’d rather tell you now than do work that will not last, so these are the limits:
- Failed render or damaged cladding panels
- Damp that isn’t coming from the joint
- Cracking across the wall rather than at a joint
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we’ll tell you honestly before you book.
Where we work in Andover
- Brickwork movement joints
- Concrete & block
- Façade panels
- Render & cladding joints
- Copings & trims
- Joints between brick and frames
External mastic in Andover, done properly
Joints in render and cladding are easy to overlook until a damp patch appears. We look over the joints, agree the ones to renew and reseal with a flexible, weatherproof product in a colour to suit. Typical jobs include rigid filler in a joint that should flex and weeds or debris growing in open joints, on copings & trims, joints between brick and frames and façade panels.
Around Andover, outside jobs take in garage door frames, porches, gutters and trims as well as walls. Each joint between different materials moves in its own way, so the sealant has to cope with that.
Every job comes with our one-year guarantee, wherever you are in Hampshire.
- Location
- Andover (SP10, SP11)
- Wider area
- Hampshire
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What happens on the day
There is not much for you to do on the day. Point us to the joints and we’ll get on with it. The work itself takes a few hours to a few days, depending on the length of joint and the access from start to finish. In Andover, parking is rarely complicated, though it helps to know about driveways or restrictions, and let us know if the work is upstairs, in a flat or up high outside.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- We cut out the failed sealant and rake out any dirt or growth.
- The joint faces are cleaned and primed where the sealant needs it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Before we arrive
- Tell us if parking is tricky
- Keep children and pets away from the work area
- Clear the area around the work
Ask for a quote
Getting a quote is simple: let us know the job and the location. A few pictures by email make the job easier to understand.
Related advice
Why deal with it now?
Water gets in through a failed movement joint and can run behind render or cladding. Resealing early keeps the job to the joint itself, instead of the wall and finishes around it. Black mould and gaps in sealant do not fix themselves, and in a busy household in Andover they spread with every shower and every downpour. Replacing the sealant now is the simplest fix.
What it costs depends on the size of the job, how much old material has to come out and access to the work. You will have a clear quote before any work starts.
Why book with us
- Anti-fungal sanitary silicone in wet areas
- Arbo and Everbuild products
- We leave the area clean and tidy
- Any old sealant cut out fully, not covered over
See our cost guide and what customers say.
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
How we quote for external mastic
The price is agreed before any work begins. It takes into account:
- How easy the joints are to reach
- How much old sealant there is and how hard it is to remove
- Which sealant suits the joint
- Working hours on commercial sites
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all make a difference, and we will explain the quote if you ask.
What to tell us for a quote
You don’t need to know the technical terms. Just tell us:
- If it’s domestic, commercial or a hotel
- Any access issues, like height or stairs
- The address or postcode of the job
- What’s wrong with the joints now
For a quick quote, get us on the phone, or email us if that’s easier. Describe what needs sealing and we will talk you through the work before giving you a price.
FAQs for Andover
Is there a guarantee on external mastic in Andover?
Every job comes with our 12-month guarantee, wherever it is. We are fully insured, and an ARBOMaster approved applicator.
I let a flat near Andover station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
Do you do commercial work?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. We can talk about working times when we quote.
Do you work at height?
It depends on the building. Send us photos and a rough idea of the height and we’ll confirm how they can be reached safely.
Can you seal joints between two different materials?
Yes. Where different materials meet is one of the most common joints we seal. We use a flexible sealant suited to both surfaces, primed where needed.
Can a movement joint be filled with mortar?
No. Cement or mortar cannot stretch and the joint fails. Where a joint has been mortared, it can often be raked out and sealed properly.
When will the joints need doing again?
It varies with how exposed the wall is and how much the joint moves. Look for splits, hardening or edges coming away.
What is a movement joint?
Brickwork, render and cladding all move a little, and planned joints take up that movement. It’s closed with backing rod and a flexible sealant.
Keeping the joints in good condition
Simple care keeps the joints in good condition. Our advice:
- Walk round the building once a year and look at the joints
- Tell anyone working on the walls about the movement joints
- Keep water from gutters off the wall
- Check the sealant is paintable before painting near it
Do not paint over the new sealant unless we have said the product is paintable. Many exterior sealants are not designed to be painted.
Gaps, plants or missing sealant in a joint are worth getting looked at. Early work is quicker and leaves a better finish.
Places near Andover
Also in Andover
When to call us in Andover
Joints sealed without backing rod, or far too deep, rarely last. If the sealant sticks to the back as well as the sides, it can’t stretch and tears as soon as the joint widens.
The problems people generally mention when they call are:
- Hard, crazed mastic that has stopped moving
- Cracked joints where brick meets render or frames
- Moss and dirt in joints with no sealant left
- Sealant pulling away from one side of the joint
For site and facilities teams at buildings such as St John the Baptist Catholic Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Questions to ask before you book
- What guarantee comes with the work
- Whether they’re fully insured
- Whether you can choose the colour
- How the joint is cleaned and prepared
Walls and rooflines in Andover
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 landlords with property near Andover station, split movement joints are easy to miss on a rental until damp shows inside. Homes close to Church of St Mary include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant.
Andover is about 17 miles west of Basingstoke, in Hampshire. Homes, rented property, offices and hotels in Andover is covered for external mastic, old or new, large or small. The work is guaranteed for a year. Our area takes in 683 places across Hampshire. Our Southampton page covers work nearby.
Every address in SP10 and SP11 is within our area for external mastic. You will find streets such as High Street, Goddard Square and London Road, all of which we cover. Andover sits on or near the A303 and A342, which makes travel easy. Neighbouring places we cover for external mastic include Picket Twenty (1 mile east), East Anton (1 mile north-east), Knights Enham (1 mile north), Finkley Down (2 miles north-east) and Picket Piece (2 miles east). We also work in nearby towns such as Winchester (13 miles south-east), Romsey (15 miles south), Hyde (12 miles south-east), Tidworth (8 miles west), Weeke (12 miles south-east) and Kempshott (15 miles east). Andover is among the bigger towns we cover in Hampshire.
What’s near Andover
Typical jobs here are in homes near The Angel Inn, Winton Community Academy and Winton Community Academy. The closest station to Andover is Andover station, roughly 0.5 miles west. Other landmarks nearby include Andover War Memorial Hospital (0.7 miles north-west) and Andover Museum (within half a mile east). The countryside around Andover includes Anton Lakes and Mill Lake.