Southampton · England
External Mastic in Bitterne
External mastic in Bitterne from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Weathered mastic that no longer stretches
- Joints where the bead has come unstuck
- Movement joints with cracked, split or missing sealant
Questions from Bitterne
Can you help a landlord with a rental near Bitterne station?
Yes, landlords and agents are among the people we work for. Just ring 0345 464 0079 or email us with the address and what needs doing, and we will give you a clear quote.
Do you cover smaller places like Bitterne?
Yes. Bitterne is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do I need to be at home?
For indoor joints, yes, someone needs to let us in. Once we have agreed the job, you do not need to watch us work.
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 will confirm the access.
Can I do it myself?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Why do you put foam in the joint first?
Backing rod goes into deeper joints as a matter of course. It sets the sealant depth and prevents three-sided bonding, so the joint can move.
Can a movement joint be filled with mortar?
No. Cement or mortar cannot stretch and the joint fails. If it has already been filled, we can normally cut it out and reseal it.
Is there any odour?
Sometimes, a little. Any smell clears as the sealant cures, and ventilation helps.
How we handle external mastic in Bitterne
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. We pick a colour that sits well with the wall. If you are dealing with rain getting behind render or cladding at a joint and joints with sealant missing in places, we can put it right, whatever the surface.
In a smaller place like Bitterne, some homes face open ground, and walls and rooflines facing the weather take the worst of it. Joints on those sides are generally the first to go.
We guarantee the work for a year. If something is not right with it in that time, tell us and we will put it right.
- Where
- Bitterne (SO18, SO19)
- Region
- Southampton
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
How it works
There’s no need to move everything out before we come, just the space around the work. We protect the rest, and the job takes anything from a few hours to several days, depending on the building in most cases. A visit to Bitterne is planned like any other: the time, the access and where to park are agreed in advance. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- First we look over the joints with you, agree which to renew and talk through access.
- Old sealant and any debris are cut and raked out.
- The joint faces are cleaned and primed where the sealant needs it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Before we arrive
- Mention if the joints have been sealed before
- On commercial sites, let us know about site rules
- Tell us if parking is tricky
How to get a quote
Need a quote? Please call 0345 464 0079 or email us with a few details. We’ll explain what we’d do and send you a clear quote before any work starts.
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How we quote for external mastic
For a quick quote, just ask. What matters most is:
- How many rooms, windows or areas are involved
- The old material and how stubborn it is
- When we can work, for business premises
- How easy the joints are to reach
We do not show prices on the website, because the cost depends so much on the job itself. Call for a quick quote and we will talk you through it.
What we need to know
Photos help, but a description is a good start. Please mention:
- Access, such as stairs, a lift or height
- Roughly how big the job is
- What the problem is, such as mould, gaps, leaks or cracking
- Pictures of the joints, sent by email
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.
What we cannot put right
New sealant cannot fix everything, and we’d rather say so up front. It won’t solve:
- Cracked brickwork or render that needs a builder or plasterer
- Loose or hollow render, which needs re-rendering
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
If in doubt, call 0345 464 0079 or email us and we’ll say what we think before booking.
Where we work in Bitterne
- Joints between brick and frames
- Render & cladding joints
- Brickwork movement joints
- Concrete & block
- Copings & trims
- Façade panels
What external mastic looks like in Bitterne
Bitterne is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That is hard on movement joints and outside wall joints, especially on the side facing the sea. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Letting a property close to Bitterne station? Then outside joints that have cracked can let damp into a rental, so check them between lets. For an older house near a landmark such as Church of the Holy Saviour, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Bitterne is about 1 mile east of Southampton, in Southampton. For external mastic in and around Bitterne, it’s easy to get a quote: please ring 0345 464 0079 or drop us an email. We cover Southampton from our Crawley base, Bitterne included. Bitterne is one of 40 towns and villages in Southampton where we work for external mastic.
We work across SO18 and SO19 for external mastic and the streets around it. Whether your property is on Bath Road, Ruby Road and Dean Road or anywhere close by, we can help. Main roads around Bitterne include the A3024, so getting to you is simple. Close by, we work in Northam (1 mile west), Bitterne Park (1 mile north-west), Itchen (1 mile south-west), Midanbury (1 mile north) and Harefield (1 mile north-east). Further out, we also cover Shirley (3 miles west), Regents Park (3 miles west), Maybush (4 miles west), Coxford (4 miles west), Freemantle (3 miles west) and Lordswood (4 miles north-west).
Landmarks near Bitterne
Around Bitterne, our work takes us to homes and buildings near Itchen College, Riverside Park and St Mary's Independent School. The nearest railway station is Bitterne station, roughly 0.7 miles north-west. A little further out are Bitterne Local History Society Heritage And Research Centre (less than half a mile north-west) and Marlands Shopping Centre (2 miles west). Green spaces nearby include Netley Common.
When to call us in Bitterne
Sometimes a movement joint was filled with mortar or a rigid filler by mistake. The joint cannot move, so the wall cracks somewhere else instead.
Signs it’s time to call us include:
- Weathered mastic that no longer stretches
- Moss and dirt in joints with no sealant left
- Movement joints with cracked, split or missing sealant
- Water getting into walls through failed joints
Schools such as Bitterne CE Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
What to look for in a quote
- How much experience the applicator has
- How the colour is chosen
- How the surfaces are prepared before sealing
- Whether they’re fully insured
Also near Bitterne
What else we do in Bitterne
Aftercare tips
How long the joints last depends on use and care. We suggest:
- Keep high-pressure jets off the joints
- Fix overflowing gutters above sealed joints
- Do not let climbing plants root in the sealant
- Walk round the building once a year and look at the joints
Do not paint over the new sealant unless we have said the product is paintable. Many exterior sealants are not designed to be painted and spoil the finish.
If you can see gaps, plants or bare sections in a joint, have it checked. Earlier resealing means a smaller job and a better result.
Landlords, agents and businesses in Bitterne
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
Can I do it myself?
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.