Southampton · England
Freemantle External Mastic
Sealing brickwork movement joints, render, cladding and façade joints in Freemantle, with a 12-month guarantee on every job. Call for a quick quote.
- Moss and dirt in joints with no sealant left
- Failed seals between different materials
- Leaking joints around cladding and façade panels
Freemantle: your questions answered
Is external mastic in a coastal place like Freemantle any different?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. The right product, a clean joint and the right depth all help it cope.
Is Freemantle within the area you cover?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Is it messy?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
Can a movement joint be filled with mortar?
No. Cement or mortar can’t stretch and the joint fails. Where a joint has been mortared, it can often be raked out and sealed properly.
Do you work at height?
It depends on the height and the site. Low-level joints are straightforward; for higher ones, send details and we’ll confirm the access.
Why is there a gap in my brick wall?
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.
Can you seal joints between two different materials?
Yes. Different materials move at different rates, so the joint between them must be flexible. We choose one that suits both surfaces.
Is there a guarantee?
Yes. All our work carries our one-year guarantee.
External mastic in Freemantle
A movement joint is a deliberate break that lets a wall expand and contract. The sealant in it has to stretch and squeeze for years, so once it splits or hardens, the joint stops working and water gets in. We are often asked to deal with weathered mastic that no longer stretches and panel joints letting water in, across copings & trims, render & cladding joints and façade panels.
Houses in smaller places like Freemantle can stand more in the open than those in a built-up town, so exposed walls and rooflines take more wind-driven rain. Joints on those sides are generally the first to go.
A 12-month guarantee comes as standard, so you’re covered after we’ve gone.
- Location
- Freemantle (SO15, SO16, SO17)
- Wider area
- Southampton
- Guarantee
- 12 months on all our work
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What happens on the day
On the day, there’s very little for you to do. 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, including the tidy-up. For a job in Freemantle, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- 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.
- We clean both faces of the joint and prime them where the product calls for it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Getting ready for the visit
- Let us know about earlier repairs to the joints
- For indoor joints, keep the area dry beforehand if you can
- Tell us if parking is tricky
Get a quote
We do not publish a price list, as no two jobs are quite the same. Instead, we give you a clear price for your job. To arrange one, phone 0345 464 0079 or drop us an email.
Read more
DIY sealant or a professional job?
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
Towns and villages near Freemantle
Also in Freemantle
When something else is needed
We will not take on work that will not last, so here’s what sealant can’t put right:
- Render that is blown, hollow or coming away
- Damp that isn’t coming from the joint
- Movement that is more than a sealant joint can take
If you’re not sure, just ring 0345 464 0079 or send us an email and we’ll give you a straight answer before you book.
What we seal
- Joints between brick and frames
- Façade panels
- Copings & trims
- Concrete & block
- Brickwork movement joints
- Render & cladding joints
What affects the cost of external mastic
Every job gets its own quote. This is what makes a difference:
- The number of rooms or windows
- The product the joint needs
- The number and length of the joints
- The old material and how stubborn it is
What you pay reflects the work, not guesswork. That’s why we ask about the job first and agree the price before starting.
Asking for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- A few photos by email, if you can
- What the problem is, such as mould, gaps, leaks or cracking
- Whether it’s a home or a business
- Access, such as stairs, a lift or height
For a quote, ring 0345 464 0079 or drop us an email with the location and a short description of the problem. We’ll give you a clear quote before any work starts.
Outside joints around Freemantle
Freemantle is within about 1 mile of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. Historic houses like Southampton Tudor House and Garden (about 1.2 miles south-east) are a reminder that the area around Freemantle has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
Rented homes near Millbrook (Hants) station change hands often, and split movement joints are easy to miss on a rental until damp shows inside. If you live in an older home near Christ Church, older walls, gutters and the joints where extensions meet them need a flexible sealant. Schools such as Freemantle Church of England Community Academy are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Freemantle is about 1 mile west of Southampton, in Southampton. Every kind of property in Freemantle can book us for external mastic. The work is guaranteed for a year. Our Southampton coverage runs to 40 places, and Freemantle is one of them.
We cover every part of the SO15, SO16 and SO17 postcode area for external mastic. Local streets include May Road, Park Road and Pitt Road. Freemantle is on the A33, which makes it straightforward to reach. We also cover the places around Freemantle: Shirley (1 mile north), Regents Park (1 mile north-west), Millbrook (1 mile west), Maybush (2 miles north-west) and Coxford (2 miles north-west). Further out, we also cover Townhill Park (3 miles north-east), Midanbury (3 miles east), Thornhill (4 miles east), Chartwell Green (4 miles east), Harefield (4 miles east) and Itchen (3 miles east).
What’s near Freemantle
We work in homes and buildings around St Anne's Catholic School, Blechynden Terrace Park and The Brass Monkey pub. Freemantle has its own railway station: Millbrook (Hants) station. Well-known places in the area include Western Community Hospital (1.3 miles north-west) and Foresters Museum & Archive (less than half a mile east). Not far away are Testwood Lakes.
For landlords and businesses
We work for letting agents and landlords as well as householders. Resealing between tenancies keeps a property looking cared for.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance.
What happens if it’s left?
A properly done movement joint is an even line in a colour that suits the wall. A rushed bead with no backing looks untidy and doesn’t last. Homes in smaller places like Freemantle can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we will explain the quote if you ask.
Why Freemantle customers choose us
- Quality sealants from Arbo and Everbuild
- Every job guaranteed for a year
- Approved under the ARBOMaster scheme
- Fully insured
Read what affects the cost or customer reviews.
Aftercare tips
So the new joints stay in good condition:
- Keep movement joints as flexible joints, not mortar
- Don’t let climbing plants root in the sealant
- Show decorators and builders where the movement joints are
- Have failed joints looked at early
Have a quick look at the joints each spring. Splits, gaps at the edges or plants in the joint are early warning signs.
A joint that has stopped moving pushes the movement elsewhere, generally as cracking in the brickwork or render nearby. Catch it early and you reduce the risk.