Hampshire · England
King's Somborne External Mastic
External mastic in King's Somborne from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Failed sealant between panels on a façade
- Weeds or debris growing in open joints
- Hard, crazed mastic that has stopped moving
Outside joints around King's Somborne
With historic houses such as Mottisfont Abbey (about 3.2 miles south-west) nearby, there’s older building stock in the area around King's Somborne as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For an older house near a landmark such as Church of St Peter and St Paul, old and new materials meet at the roofline and walls, which is where sealant earns its keep. If you look after a building such as King's Somborne Church of England Primary School, larger buildings have long runs of movement joint that eventually need resealing. For landlords with property near Mottisfont & Dunbridge station, split movement joints are easy to miss on a rental until damp shows inside.
King's Somborne is about 6 miles north of Romsey, in Hampshire. Homes, rented property, offices and hotels in King's Somborne is covered for external mastic. Every job comes with our 12-month guarantee. Across Hampshire, we cover 683 places, King's Somborne among them. Southampton is on our list too, about 12 miles from King's Somborne.
Our applicators cover all of the SO20 postcode area for external mastic. External mastic is available to properties on Church Road, Old Palace Farm and Forge Close. With the A3057 close by, King's Somborne is simple for us to get to. We also cover the places around King's Somborne: Ashley (1 mile east), Little Somborne (2 miles north-east), Up Somborne (2 miles north-east), Braishfield (4 miles south) and Lower Slackstead (4 miles south-east). Further out, we also cover Winchester (7 miles east), Eastleigh (10 miles south-east), Andover (9 miles north), Totton (11 miles south), Chandler's Ford (8 miles south-east) and Hedge End (14 miles south-east).
Around King's Somborne
We work in homes and buildings around The Crown Public House. The nearest railway station is Mottisfont & Dunbridge station, roughly 4 miles south-west of the centre. Nearby you’ll also find Romsey Community Hospital (5.8 miles south).
External mastic in King's Somborne
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible sealant bridges the two where a rigid filler would soon crack. We are often asked to deal with joints where the bead has come unstuck and brick movement joints where the sealant has split, across brickwork movement joints, render & cladding joints and façade panels.
Somewhere as small as King's Somborne, homes and farm buildings often face open ground, where walls and rooflines take the weather head on. Gutter joints and wall joints there need a sealant that can flex and stay put.
All our work is covered by a one-year guarantee, wherever you are in Hampshire.
- Where
- King's Somborne (SO20)
- Region
- Hampshire
- Cover
- A year, on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Can I do it myself?
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so just mention it when you contact us.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Aftercare tips
Simple care keeps the joints in good condition. Our advice:
- Leave the joints unpainted unless we’ve said otherwise
- Clear growth from the base of walls and joints
- Act on the first splits you see
- Point out the joints to other trades
Give the sealant the cure time we tell you before anything rubs against it. The surface skins over quickly, but full cure takes longer.
Once a joint cannot move, the wall finds another way, often as cracks near the joint. Resealing it early helps prevent that.
What sealant work can’t fix
We won’t take on work that will not last, so these are the limits:
- Rising or penetrating damp from elsewhere in the wall
- Adding movement joints to masonry that has none
- Subsidence or other structural problems
If you’re not sure, just call 0345 464 0079 or send us an email and we’ll give you a straight answer before you book.
What we seal
- Copings & trims
- Render & cladding joints
- Brickwork movement joints
- Joints between brick and frames
- Façade panels
- Concrete & block
Your questions about external mastic in King's Somborne
Do you cover King's Somborne for external mastic?
Yes, King's Somborne is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we will give you a clear price.
I let a flat near Mottisfont & Dunbridge station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just phone 0345 464 0079 or email us with the address and what needs doing, and we will give you a clear price.
Do you work for hotels and businesses?
Yes, regularly. We can plan bigger jobs in stages.
Do I have to be there?
If the work is inside, we need someone to let us in. Once we’ve agreed the job, you don’t need to watch us work.
Can you seal joints between two different materials?
Yes. Joints between dissimilar materials are a big part of external work. The sealant is chosen to bond to both sides.
Is it OK to seal over old sealant?
No, and we never do. It may look fine at first, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
Why do you put foam in the joint first?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. Then the sealant bonds to two faces and can move.
How long does external mastic take?
Typically it takes anything from a few hours to several days, depending on the building. Larger jobs naturally take longer.
How we quote for external mastic
We don’t publish a price list, because no two jobs are the same. What we look at:
- How many rooms, windows or areas are involved
- How much there is to do
- Any mould that needs treating
- How much old sealant there is and how hard it is to remove
The cost depends on how much there is to do, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before any work starts, so you know where you stand.
What to tell us for a quote
Photos by email are helpful but not essential. Try to tell us:
- Where the job is, and your postcode
- How many joints, rooms or windows are involved
- Any previous sealing or DIY work
- What’s wrong with the joints now
Getting a quote is simple: let us know the job and the location. Photos by email help us understand the job, and we will come back to you with a quote.
Landlord and commercial work in King's Somborne
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Housing providers, facilities teams and property managers book us too. Several sites can go on one quote.
Nearby places to King's Somborne
What else we do in King's Somborne
Surface by surface
Copings and trims
A failed coping joint lets water into the top of the wall. Resealing them is a small job that protects a lot.
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. The movement joint takes that up, so the sealant in it must stay soft and stretchy.
What happens on the day
At the end, we look at the finished work together. The visit itself normally takes a few hours to a few days, depending on the length of joint and the access, depending on the size of the job. For a village or hamlet like King's Somborne, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- The old mastic and anything lodged in the joint is removed.
- We clean both faces of the joint and prime them where the product calls for it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Preparing for the visit
- Let us know about earlier repairs to the joints
- Tell us about any water getting in
- Let us know about parking restrictions
Getting a quote
Want a quote for external mastic? Please phone 0345 464 0079 or send us an email and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.