Hampshire · England
External & façade joints in Calshot, Hampshire
Problem with your movement joints in Calshot? We cut out the old, prepare the joints and apply the right sealant.
- Movement joints filled with mortar instead of sealant
- Joints with sealant missing in places
- Sealant that has lost its bond to the brick or render
About our external mastic in Calshot
External mastic is a job where short cuts show quickly. New sealant over old, joints packed with mortar and beads with no backing rarely last long. We take the old material out and do it properly. Typical jobs include sealant that has lost its bond to the brick or render and cracked joints where brick meets render or frames, across copings & trims, façade panels and joints between brick and frames.
Around Calshot, older buildings can be stone, brick or timber-framed, many with extensions added later. The joints where those materials meet are the weak points, and they need the right sealant at the right depth.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Where
- Calshot (SO45)
- Region
- Hampshire
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Walls and rooflines in Calshot
Calshot 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. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
In the older streets around St George, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Calshot is about 4 miles north of Cowes, in Hampshire. Wherever you are in the SO45 postcode area, our applicators can take on external mastic. 683 places in Hampshire are on our list, large and small. Our Southampton page covers work nearby (8 miles or so).
Our applicators cover all of the SO45 postcode area for external mastic and the streets around it. Whether your property is on Bus Drove, Elmfield Lane and Tristan Close or a nearby road, we can help. Other places close to Calshot include Hillhead (1 mile south-east), Sprat's Down (1 mile west), Stanswood (1 mile south-west), Stonehills (1 mile north-west) and Ashlett (1 mile north-west). We also work in nearby towns such as Gosport (8 miles east), Havant (15 miles east), Eastleigh (11 miles north), Fareham (6 miles north-east), Horndean (15 miles north-east) and Totton (11 miles north-west).
Near you in Calshot
For rail, the closest station is Hamble station, roughly 4.1 miles north of the centre. Well-known places in the area include Calshot Castle (1.1 miles north-east) and Coldeast (4.5 miles north-east). Open spaces near Calshot include Mercury Marshes and Mill Hill.
Calshot: your questions answered
Is external mastic in a coastal place like Calshot any different?
Coastal homes put outside sealant through more weather than inland ones, so preparation and the right sealant matter all the more. It’s worth checking the walls that face the sea first.
Do you work for landlords with property near Hamble station?
Yes, we work for letting agents and landlords. You can ring 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before we start.
How long should I leave it?
Different products cure at different speeds, so follow the cure time we give you.
Can I add another job to the visit?
Yes. More than one area can be quoted together.
How do I get a quote for external mastic in Calshot?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote.
Is there any odour?
Some sealants have a smell while they cure, but it fades. Opening a window helps.
What is backing rod for?
We fit closed-cell backing rod wherever the joint depth needs controlling. It controls the depth and stops the sealant bonding to the back.
Can you reach joints on upper floors?
Each building is different. Tell us the height, the number of joints and what’s below them, and we will confirm what access is needed.
How the job changes by surface
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. Their movement joints are sealed over backing rod with a flexible sealant.
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. They’re resealed over backing rod with a low-modulus sealant.
Honest limits
It helps to know what we can’t do too:
- Cracking across the wall rather than at a joint
- Subsidence or other structural problems
- Adding movement joints to masonry that has none
If you’re not sure, just phone 0345 464 0079 or email us and we will give you a straight answer before booking.
What we seal
- Façade panels
- Brickwork movement joints
- Copings & trims
- Concrete & block
- Joints between brick and frames
- Render & cladding joints
DIY sealant or a professional job?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
If you’ve already had a go yourself, that is fine. We cut it out and start again, so tell us about it when you ask for a quote.
What affects the quote in Calshot
We quote each job individually. These are the things that affect it:
- The number of rooms or windows
- Whether the work is at height
- When we can work, for business premises
- The size of the job
Doing several joints on one visit normally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. We will send you a clear quote for the lot.
Helping us quote
Before you ask for a quote, have a think about:
- Whether it’s a home or a business
- The problem you’ve noticed
- Photos by email, if that is easy
- The address or postcode of the job
For a quote, phone 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. You’ll have a clear quote before we start.
The process
A visit follows a simple pattern: we check the joints, mask and protect the surrounding surfaces, do the work and tidy away. It usually takes anything from a few hours to several days, depending on the building. In a small place like Calshot, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- The old mastic and anything lodged in the joint is removed.
- The joint faces are cleaned and primed where the sealant needs 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
- For business premises, tell us about site rules or sign-in
- Keep children and pets away from the work area
- Let us know about parking restrictions
Getting a quote
Call for a quick quote, or email us if that’s easier. Tell us about the joints that need doing and we’ll talk you through the work.
Read more
Signs you need external mastic in Calshot
Poor preparation causes many early failures: dusty or wet faces, no primer where one was needed, or old sealant left in. The sealant never bonds properly.
The problems people usually mention when they call include:
- Movement joints with cracked, split or missing sealant
- Plants rooting in failed movement joints
- Sealant that has lost its bond to the brick or render
- Rigid filler in a joint that should flex
Rented homes near Hamble station change hands often, and split movement joints are easy to miss on a rental until damp shows inside.
What your quote should include
- Whether you can choose the colour
- What happens if they find a problem under the old sealant
- When the joint can take water or movement
- How the surfaces are prepared before sealing
Also near Calshot
Also in Calshot
Why it’s worth doing now in Calshot
Pointing a movement joint with mortar might seem a neat fix, but it stops the joint moving. The movement then cracks the brickwork or render nearby. A flexible sealant over backing rod is what the joint needs. Older cottages and farmhouses around Calshot can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
What you pay reflects the work, not a rough estimate. That’s why we ask about the job first and agree the price before starting.
Why Calshot clients choose us
- Homes, businesses and hotels
- White, clear, grey or coloured to suit, where the product allows
- Colour agreed with you before work begins
- Sanitary silicone with an anti-fungal additive in wet areas
Take a look at our cost guide and what customers say.