Hampshire · England
External & façade joints in Worthy Down, Hampshire
Professional external mastic in and around Worthy Down, with old sealant always removed completely.
- Cracked joints where brick meets render or frames
- Brick movement joints where the sealant has split
- Joints where the bead has come unstuck
What the job involves on each surface
Copings and trims
Joints in copings, parapets and trims are exposed to the worst of the weather. Each is resealed with a weatherproof, flexible sealant.
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. That movement goes into the joint, so the sealant in it must stay soft and stretchy.
External mastic for homes and businesses in Worthy Down
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. The colour is chosen to suit the brick or render so the line blends in. We’re often asked to deal with sealant pulling away from one side of the joint and rain getting behind render or cladding at a joint, across façade panels, copings & trims and concrete & block.
Older homes in small places like Worthy Down may be stone, brick or timber-framed, often with later extensions. The joints where those materials meet are the weak points, and they need the right sealant at the right depth.
There’s a 12-month guarantee on every job, large or small.
- Location
- Worthy Down (SO21)
- Region
- Hampshire
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Work for landlords, hotels and businesses
In hotels, rooms out of use cost money, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.
Walls and rooflines in Worthy Down
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Rented homes near Winchester station change hands often, and split movement joints are easy to miss on a rental until damp shows inside. For site and facilities teams at buildings such as South Wonston Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. Homes close to St Margaret's include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Worthy Down is about 4 miles north of Winchester, in Hampshire. Anywhere in SO21, we cover external mastic for homes and businesses. Worthy Down is one of 683 towns and villages in Hampshire where we work. You can also see our page for Southampton, roughly 14 miles from Worthy Down.
Here we cover the SO21 postcode area for external mastic. That includes homes and businesses on Coopers Close, Coate Drive and Wellesley Drive. Other places close to Worthy Down include South Wonston (1 mile north), Springvale (2 miles south-east), Crawley (3 miles west), Sutton Scotney (3 miles north) and Stoke Charity (3 miles north-east). Larger places within reach include Basingstoke (15 miles north-east), Winchester (4 miles south), Eastleigh (10 miles south), Andover (9 miles north-west), Totton (15 miles south-west) and Chandler's Ford (9 miles south).
Landmarks near Worthy Down
In Worthy Down, that means homes and buildings near Henry Beaufort School. The nearest railway station is Winchester station, roughly 3.2 miles south of the centre. Other landmarks nearby include Royal Hampshire County Hospital (3.5 miles south) and Royal Observer Corps Museum (2.7 miles south-east). Green spaces nearby include Winnall Moors.
Also near Worthy Down
Also in Worthy Down
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Ask before painting over external sealant
- Make sure movement joints are not pointed over
- Keep water from gutters off the wall
- Point out the joints to other trades
Follow the cure time we give you before the joint is knocked or disturbed. The surface skins over quickly, but full cure takes longer.
Small splits are the time to act. At that stage it’s a simple cut out and reseal with no damage behind it to deal with.
What happens if it’s left?
A failed movement joint lets water into the wall, behind render and cladding. Resealing early keeps the job to the joint itself, rather than the wall around it. Older cottages and farmhouses around Worthy Down can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Call for a quick quote and we’ll explain what it covers.
Why choose Mr Mastic in Worthy Down
- Experience in homes, commercial sites and hotels
- Tidy, careful work
- 180+ five-star Google reviews
- A sealant colour to suit the surroundings
Read what affects the cost and what customers say.
DIY sealant or a professional job?
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
What we cannot put right
We will always be straight with you, so here’s what sealant cannot fix:
- Damp that is not coming from the joint
- Walls that need new movement joints cut into them
- Render that is blown, hollow or coming away
Not sure which it is? You can call 0345 464 0079 or send us an email and we’ll tell you honestly before booking.
Where we work in Worthy Down
- Joints between brick and frames
- Brickwork movement joints
- Façade panels
- Render & cladding joints
- Concrete & block
- Copings & trims
Worthy Down: your questions answered
Is Worthy Down within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you work for landlords with property near Winchester station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or email us and tell us about the property, and we’ll send you a clear quote.
How do you reach high-level joints?
That depends on how high the joints are and the ground below. Low-level joints are straightforward; for higher work, tell us about the building and we’ll confirm what’s needed.
How much does external mastic cost in Worthy Down?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. You’ll get a clear quote before work begins.
Can you match the colour of my brickwork?
Exterior sealants are made in a range of colours, from greys and browns to whites and stone shades. We choose the closest to your brick or render so it does not stand out.
What do you put in the joint?
Each joint gets the product that suits it. Movement, water and weather all affect the choice.
What information do you need?
Only a few details: the address or postcode, what’s wrong and any access issues. After that, simply phone 0345 464 0079 or drop us an email.
Why is there a gap in my brick wall?
Brickwork, render and cladding all move a little, and planned joints take up that movement. The gap is sealed with a flexible sealant over backing rod.
What we do, step by step
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The work itself takes a few hours for a handful of joints, longer for a whole elevation. In a small place like Worthy Down, access is normally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- 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.
- We clean both faces of the joint and prime them where the product calls for it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
How to prepare
- On commercial sites, let us know about site rules
- Mention any tricky access
- Tell us if parking is tricky
Getting a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. When it suits you, phone 0345 464 0079 or drop us an email.