Southampton · England
External & façade joints in Northam, Southampton
Professional external mastic in and around Northam, with old sealant always removed completely and a 12-month guarantee.
- Rain getting behind render or cladding at a joint
- Joints pointed up with cement by mistake
- Brick movement joints where the sealant has split
Leave it or put it right?
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That protects surfaces like brick, render and concrete. A stiffer product can damage the joint edge as it fails. Around Northam, water from a failed joint in an older home can soak into timber and plaster, which is far harder to put right than the sealant itself.
The cost reflects the work involved, not guesswork. That is why we ask about the job first and send you a clear quote before work begins.
What you get with us
- A 12-month guarantee on all work
- Experience in homes, commercial sites and hotels
- Colour agreed with you before we start
- Old sealant always removed completely
Take a look at what affects the cost and what customers say.
External mastic in Northam
Getting the depth right is half the job. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, leaving it bonded to two faces so it can move with the wall. Typical jobs include leaking joints around cladding and façade panels and sealant pulling away from one side of the joint, across joints between brick and frames, concrete & block and render & cladding joints.
In and around Northam, older properties sit alongside newer ones, each with its own outside joints. Older gutters and trims need their joints resealed; newer brick and render need their movement joints kept sound.
All our work is covered by a 12-month guarantee, wherever you are in Southampton.
- Place
- Northam (SO14, SO19, SO18)
- Region
- Southampton
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What affects the cost of external mastic
The price is agreed before any work begins. It takes into account:
- Whether there’s mould to deal with
- The type of sealant required
- Access and height
- The number and length of the joints
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
What to tell us for a quote
To help us quote quickly, let us know:
- If someone has resealed it before
- A few pictures by email, if you can
- Where the property is
- Any access issues, like height or stairs
There’s no standard price list, because every job is different. Instead, we give you a clear quote for your job. To get started, ring 0345 464 0079 or drop us an email.
What external mastic looks like in Northam
Northam is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on movement joints and outside wall joints, especially on the side facing the sea. Historic houses like Southampton Tudor House and Garden (about 1.3 miles south-west) are a reminder that the area around Northam has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
For an older house near a landmark such as Church of St Augustine, older walls, gutters and the joints where extensions meet them need a flexible sealant. If you look after a building such as Bitterne Manor Primary School, its movement joints, gutters and trims need looking after like any other building’s.
Northam is about 1 mile south-east of Southampton, in Southampton. Jobs in Northam get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. Northam is one of 40 places in Southampton where we work.
Postcode districts we cover here for external mastic: SO14, SO19 and SO18. Whether your property is on Sea Road, Lumpy Lane and Cross Road or a nearby road, our applicators can take on the job. Nearby, we also carry out external mastic in Peartree Green (1 mile south), Bitterne Manor (1 mile north), Itchen (1 mile south-east), St Mary's (1 mile south-west) and Bitterne (1 mile east). Within a short drive, we also cover Regents Park (3 miles west), Maybush (3 miles north-west), Coxford (3 miles north-west), Lordswood (3 miles north-west), Eling (5 miles west) and Rownhams (4 miles north-west).
What’s near Northam
In Northam, that means homes and buildings near Inspire Enterprise Academy, East Park and The Engineers Arms, among other places. Northam’s nearest station is Bitterne station, about 0.6 miles north. Other landmarks nearby include Bitterne Local History Society Heritage And Research Centre (0.8 miles east) and Marlands Shopping Centre (1.2 miles west). Not far away are Netley Common.
Do you need external mastic in Northam?
UV, rain and frost all age exterior sealant. Over the years it hardens, cracks on the surface and loses its give, so the next time the wall moves, it splits or pulls away.
The most common problems we see are:
- Leaking joints around cladding and façade panels
- Sealant that has lost its bond to the brick or render
- Water getting into walls through failed joints
- Gaps where render, brick and frames meet
For landlords with property near Bitterne station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
What your quote should include
- Are they insured?
- Is the old sealant removed completely?
- Which colour the sealant will be
- Is VAT in the price?
Your questions about external mastic in Northam
Will you come out to Northam?
Yes, Northam is covered. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Does the coastal weather in Northam affect outside sealant?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. The right product, a clean joint and the right depth all help it cope.
I rent my home. Can I book you?
Yes. Check with your landlord; we can send the quote to them too.
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.
Do you remove the old sealant?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
How much does external mastic cost in Northam?
Every job is different, so each one gets its own quote. To get one, phone 0345 464 0079 or email us with a short description of the job.
What information do you need?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
When will the joints need doing again?
It depends on the exposure, the movement and the product. Treat it as a maintenance item and look at it yearly.
How to look after the new joints
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Make sure movement joints aren’t pointed over
- Keep high-pressure jets off the joints
- Point out the joints to other trades
- Get split or bare joints resealed while the damage is small
Only paint over the joint if we have confirmed the sealant can take paint. Paint can crack on a flexible joint.
If you can see gaps, plants or bare sections in a joint, have it checked. Early work is quicker and leaves a better finish.
Towns and villages near Northam
What else we do in Northam
The process
We keep the work tidy and contained to the area we’re working on. The job generally takes anything from a few hours to several days, depending on the building, and we tell you how long to leave it before we go. Parking around Northam is usually easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- 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.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Preparing for the visit
- Keep pets and children clear of the area while we work
- Tell us about any previous sealing or DIY attempts
- Tell us if parking is tricky
Ask for a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. When it suits you, phone 0345 464 0079 or email us.
Read more
Can I do it myself?
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
When something else is needed
Some problems need a builder, plumber or other trade rather than us:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Walls that need new movement joints cut into them
- Movement that’s more than a sealant joint can take
If you are not sure, just call 0345 464 0079 or send us an email and we will give you a straight answer.
Joints and surfaces we work on
- Façade panels
- Joints between brick and frames
- Render & cladding joints
- Concrete & block
- Copings & trims
- Brickwork movement joints