Hampshire · England
External Mastic in Walhampton
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Walhampton and across Hampshire. Fully insured, ARBOMaster approved and guaranteed for a year.
- Sealant that has lost its bond to the brick or render
- Old sealant gone brittle and cracked
- Rigid filler in a joint that should flex
How we handle external mastic in Walhampton
On houses, flats and commercial buildings across Walhampton, we reseal joints in brickwork, render, cladding and façade panels. The preparation is the same whatever the wall: clean joint faces and the right depth. If you’re dealing with old sealant gone brittle and cracked and damp patches traced to an open external joint, we can put it right.
External sealant needs dry, clean surfaces, so work around Walhampton is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Place
- Walhampton (SO41)
- Wider area
- Hampshire
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
How to look after the new joints
Aftercare is simple:
- Check external joints each spring
- Get split or bare joints resealed while the damage is small
- Fix overflowing gutters above sealed joints
- Tell anyone working on the walls about the movement joints
Have a quick look at the joints each spring. Watch for splits, edges coming away or growth in the joint.
An open movement joint lets rain into the wall every time it pours. Over time it can mean damp inside, stained render or frost-damaged brick which cost more to put right than the joint.
What we can’t put right
It helps to know what we can’t do too:
- Walls that need new movement joints cut into them
- Cracks in the bricks or render themselves, away from the joints
- Structural movement, which needs a surveyor or engineer
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly before you book.
What we seal
- Brickwork movement joints
- Façade panels
- Copings & trims
- Render & cladding joints
- Joints between brick and frames
- Concrete & block
Your questions about external mastic in Walhampton
Do you cover smaller places like Walhampton?
Yes. Walhampton is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Does the coastal weather in Walhampton affect outside sealant?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
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.
Which products do you use?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. We use products from Arbo and Everbuild.
Why is there a gap in my brick wall?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It should be filled with flexible sealant, never mortar.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status.
What do you need from me for a quote?
A short description and the location. If we need more, we’ll ask.
Can landlords and businesses book you?
Yes, regularly. We can quote for several properties at once.
Quotes for external mastic in Walhampton
Every job gets its own quote. These are the things that affect it:
- Any mould that needs treating
- Working hours on commercial sites
- The number of rooms or windows
- Whether old sealant or filler has to be cut out
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part.
What to tell us for a quote
You do not need to know the technical terms. Just tell us:
- The type of property
- Any previous sealing or DIY work
- The rough size of the job
- Access, such as stairs, a lift or height
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is. Whenever you’re ready, phone 0345 464 0079 or send us an email.
What happens on the day
Once we are on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. Most jobs then take anything from a few hours to several days, depending on the building. Somewhere like Walhampton needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- 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 sign-in or site rules at work premises
- Mention any leaks or damp you’ve noticed
- Plan for the work area to be out of bounds to pets and children
Getting a quote
For a quick quote, get us on the phone, or email us if that’s easier. Describe what needs sealing and we will explain what’s involved.
Related advice
Leave it or put it right?
Done well, a resealed joint is a neat, straight line that suits the wall. A rushed bead with no backing looks untidy and doesn’t last so it’s worth doing right. Where a wall is exposed, as many are in small places like Walhampton, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Combining jobs into one visit is usually more efficient than separate visits. You will get one clear quote for the whole job.
Why Walhampton clients choose us
- Neat joints and a tidy finish
- Sealant colour chosen to suit
- We’re fully insured
- White, clear, grey or another colour, product permitting
Do you need external mastic in Walhampton?
Every building moves. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. All of that ends up in the joint sealant.
The problems people usually mention when they call include:
- Sealant that has lost its bond to the brick or render
- Failed sealant between panels on a façade
- Rain getting behind render or cladding at a joint
- Cracked joints where brick meets render or frames
Homes close to United Reform Church include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant.
Comparing quotes
- Whether all the old sealant comes out first
- The length of the guarantee
- How much experience the applicator has
- How the joint is cleaned and prepared
What else we do in Walhampton
Walhampton buildings and the weather
Walhampton is within about 1 mile of 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. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you look after a building such as Lymington Church of England Infant School, larger buildings have long runs of movement joint that eventually need resealing. For landlords with property near Lymington Town station, split movement joints are easy to miss on a rental until damp shows inside.
Walhampton is about 1 mile east of Lymington, in Hampshire. Anywhere in SO41, we can carry out external mastic at your property. We cover 683 towns and villages across Hampshire, large and small. There’s also a page for Southampton, about 12 miles away.
Here we cover the SO41 postcode area for external mastic. Local streets include Undershore Road and Walhampton Hill. Close by, we work in Lymington (1 mile west), Portmore (1 mile north), Warborne (1 mile north), Pennington (1 mile south-west) and Pilley (2 miles north). Larger places within reach include Totton (11 miles north), Hedge End (15 miles north-east), Hythe (9 miles north-east), New Milton (6 miles west), Ringwood (12 miles north-west) and Locks Heath (14 miles north-east).
Around Walhampton
In Walhampton, that means homes and buildings near The Ferryman pub, Priestlands School and Southlands School, among other places. Walhampton has its own railway station: Lymington Town station. A little further out are Lymington New Forest Hospital (0.8 miles north-west) and Yarmouth Castle (4 miles south). Open spaces near Walhampton include Boldre Foreshore.
Can I do it myself?
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.