Hampshire · England
External Mastic in Netley Marsh
Specialist external mastic for Netley Marsh: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Moss and dirt in joints with no sealant left
- Failed sealant between panels on a façade
- Gaps where render, brick and frames meet
External mastic in Netley Marsh, done properly
Ground-floor and low-level joints are straightforward to reach. For joints higher up, give us some details of the building and we’ll confirm what access is needed. We work on façade panels, brickwork movement joints and concrete & block, and the jobs we see most are sealant that has lost its bond to the brick or render and weathered mastic that no longer stretches.
External sealant needs dry, clean surfaces, so work around Netley Marsh is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
We stand behind the work with a one-year guarantee, so you’re not left on your own once the job is done.
- Location
- Netley Marsh (SO40)
- Wider area
- Hampshire
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What affects the quote in Netley Marsh
The price is agreed before any work begins. It takes into account:
- When we can work, for business premises
- The number of rooms or windows
- Whether the work is at height
- Which sealant suits the joint
Combining jobs into one visit is generally more efficient than separate visits, so tell us about everything that needs sealing. We will give you a clear quote for the lot.
What we need to know
To make quoting easier, let us know:
- A few photos by email, if you can
- How many joints, rooms or windows are involved
- Whether it’s a home or a business
- Where the job is, and your postcode
If you are in Netley Marsh and need external mastic, ring 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
How the job changes by surface
Joints between dissimilar materials
Different materials may need different primers. Both surfaces are cleaned and primed as the product requires.
Concrete and blockwork
Blockwork and concrete shrink over time and move with the seasons. We reseal their joints with backing rod and a flexible product.
More services for Netley Marsh
Why deal with it now?
Pointing a movement joint with mortar might seem a neat fix, but it stops the joint moving. The wall then cracks somewhere else. The correct repair is a flexible sealant with the right backing. Around Netley Marsh, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all play a part, and we’ll explain the quote if you ask.
Why book with us
- A 12-month guarantee on all work
- 4.9 on Google from 180+ five-star reviews
- A choice of colours where the product allows
- Arbo and Everbuild products
Take a look at our cost guide or what customers say.
Landlords, agents and businesses in Netley Marsh
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Letting agents often deal with us directly. Tell us the address, the job and how access works and we’ll quote.
What we do, step by step
There’s no need to move everything out, just the space around the work. We protect the rest, and the work takes a few hours to a few days, depending on the length of joint and the access for a typical job. In a small place like Netley Marsh, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- Mention any leaks or damp you’ve noticed
- Plan for the work area to be out of bounds to pets and children
- Where the joints are inside, avoid wetting them before we arrive
How to get a quote
Asking for a quote is easy: let us know the job and the location. Photos by email help us understand the job, and we will take it from there.
Advice
Signs you need external mastic in Netley Marsh
Every building moves. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. All of that ends up in the joint sealant.
The problems people normally mention when they call are:
- Old sealant gone brittle and cracked
- Moss and dirt in joints with no sealant left
- Movement joints filled with mortar instead of sealant
- Failed sealant between panels on a façade
Rented homes near Ashurst New Forest station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets.
Before booking anyone
- What preparation is included
- What the cure time is
- Whether they’re fully insured
- Who turns up on the day
When it is not the sealant
It helps to know what we cannot do too:
- Failed render or damaged cladding panels
- Adding movement joints to masonry that has none
- Structural movement, which needs a surveyor or engineer
Not sure which it is? You can ring 0345 464 0079 or send us an email and we will tell you honestly before you book.
Where we work in Netley Marsh
- Brickwork movement joints
- Copings & trims
- Façade panels
- Concrete & block
- Joints between brick and frames
- Render & cladding joints
Outside joints around Netley Marsh
Netley Marsh 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’s 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.
Managing a site like Netley Marsh Church of England Infant School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. If you live in an older home near Church of St Matthew, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Netley Marsh is about 1 mile west of Totton, in Hampshire. Homes, rented property, offices and hotels in Netley Marsh can book us for external mastic. The work is guaranteed for a year. 683 places in Hampshire are on our list, from the larger towns to small villages. We also work in Southampton, around 6 miles away.
Postcode districts we cover here for external mastic: SO40. Whether your property is on Ringwood Road and Woodlands Road or anywhere close by, our applicators can take on the job. Other places close to Netley Marsh include Ashurst Bridge (1 mile south-east), Totton (1 mile east), Woodlands (1 mile south), Winsor (1 mile north-west) and Bartley (1 mile west). We also work in nearby towns such as Winchester (14 miles north-east), Eastleigh (9 miles north-east), Fareham (15 miles east), Chandler's Ford (8 miles north-east), Hedge End (10 miles east) and Lymington (11 miles south).
What’s near Netley Marsh
In Netley Marsh, that means homes and buildings near Hounsdown School and The White Horse pub. The closest station to Netley Marsh is Ashurst New Forest station, roughly 1.8 miles south of the centre. Other landmarks nearby include National Dairy Museum (1.8 miles south-east) and Tatchbury Mount Hospital (1.1 miles north). Open spaces near Netley Marsh include Testwood Lakes.
Common questions in Netley Marsh
Does living near the coast affect external mastic in Netley Marsh?
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.
Will you come out to Netley Marsh?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
How long does external mastic take?
Typically it takes a few hours to a few days, depending on the length of joint and the access. Bigger jobs take longer.
Where are you based?
We are a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
Do you work for hotels and businesses?
Yes. Larger jobs can be planned room by room or area by area.
How often do external joints need resealing?
It varies from wall to wall: joints on exposed walls or with a lot of movement age sooner. A yearly look will tell you when they need doing. Our work comes with a one-year guarantee.
Is the work guaranteed?
Yes: twelve months. If anything is not right with the work within the year, let us know and we will sort it.
Are you insured?
Yes, we are fully insured for every job we do.