Hampshire · England
External & façade joints in Gosport, Hampshire
External mastic in Gosport from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Joints with sealant missing in places
- Damp patches traced to an open external joint
- Cracked joints where brick meets render or frames
About our external mastic in Gosport
We are ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Porous or awkward surfaces are primed where the sealant needs it, and we do not skip that step. We work on façade panels, copings & trims and render & cladding joints, and people most often call us about moss and dirt in joints with no sealant left and rain getting behind render or cladding at a joint.
Outside joints can only be sealed when they’re dry, so work in Gosport is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we will put it right.
- Location
- Gosport (SO51)
- Region
- Hampshire
- Cover
- One year on every job
- Price
- A clear price before we start
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Why it’s worth doing now in Gosport
The longer a joint stays open, the more water the wall takes in. Wet masonry is more easily damaged by frost around the joint, so the damage spreads beyond the joint. Around Gosport, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Why us?
- Anti-fungal sanitary silicone in wet areas
- More than 20 years in sealant work
- 4.9 on Google from 180+ five-star reviews
- Homes, businesses and hotels
Read our cost guide or customer reviews.
The process
The work is kept neat and contained to the joints we’re treating, so you can carry on as normal. The job normally takes a few hours for a handful of joints, longer for a whole elevation, and we explain the cure time before we leave. Somewhere like Gosport 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.
- First we look over the joints with you, agree which to renew and talk through access.
- 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.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Preparing for the visit
- Let us know about parking restrictions
- On commercial sites, let us know about site rules
- Clear items away from the joints we are working on
Getting a quote
Getting a quote is simple: let us know the job and the location, and roughly how big it is. A few pictures by email make the job easier to understand, and we will come back to you with a quote.
Read more
Keeping the joints in good condition
Looking after new joints is easy:
- Get split or bare joints resealed while the damage is small
- Keep high-pressure jets off the joints
- Check the sealant is paintable before painting near it
- Do not let climbing plants root in the sealant
Don’t 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.
How the job changes by surface
Cladding and façade panels
Metal and composite panels move a lot with temperature, so the joint sealant has to cope with frequent movement. We choose the product to suit.
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. The movement joint takes that up, so its sealant has to stay flexible.
Places near Gosport
What else we do in Gosport
What external mastic looks like in Gosport
Compared with the north and west, the South East gets less rain, 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 Mark, 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 Ampfield Church of England Primary School, its movement joints, gutters and trims need looking after like any other building’s. For landlords with property near Chandlers Ford station, split movement joints are easy to miss on a rental until damp shows inside.
Gosport is about 2 miles east of Romsey, in Hampshire. Gosport gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a 12-month guarantee. Gosport is one of 683 places in Hampshire we cover for external mastic. You can also see our page for Southampton, roughly 6 miles from Gosport.
We cover every part of the SO51 postcode area for external mastic and the streets around it. We also cover the places around Gosport: Ampfield (1 mile north-east), Crampmoor (1 mile west), Knapp (1 mile north-east), Broadgate (1 mile east) and Lower Slackstead (2 miles north). We also work in nearby towns such as Winchester (6 miles north-east), Eastleigh (5 miles south-east), Fareham (15 miles south-east), Andover (14 miles north), Totton (7 miles south-west) and Hedge End (8 miles south-east).
Local landmarks in Gosport
We work in homes and buildings around White Horse Public House and The Mountbatten School, among other places. Gosport’s nearest station is Chandlers Ford station, about 2.6 miles south-east of the centre. Other landmarks nearby include King Johns House (2.9 miles west) and Romsey Community Hospital (2.2 miles west). Green spaces nearby include Emer Bog and Baddesley Common.
What affects the quote in Gosport
The quote reflects the job in front of us. We look at:
- The old material and how stubborn it is
- The product the joint needs
- Any mould that needs treating
- Working hours on commercial sites
Combining jobs into one visit is generally more efficient than separate visits, so tell us about everything that needs sealing. We’ll give you a clear quote for the lot.
Helping us quote
When you call or email, these details help:
- What’s wrong with the joints now
- Whether it’s a home or a business
- Any access issues, like height or stairs
- How many joints, rooms or windows are involved
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. When it suits you, call 0345 464 0079 or drop us an email.
Gosport: your questions answered
Is Gosport in your area for external mastic?
Yes. We work across London and the South East, and Gosport is part of that. You can phone 0345 464 0079 or drop us an email and tell us what needs doing.
I let a flat near Chandlers Ford station. Can you help?
Yes. We work for landlords and agents as well as homeowners. You can phone 0345 464 0079 or drop us an email with the details for a clear quote.
Can you reach joints on upper floors?
It depends on the building. We work on joints that can be reached safely. Give us some details and we will confirm the access.
How often do external joints need resealing?
That varies with the weather the wall faces, how much it moves and the sealant used. Sealant is a maintenance item, so check the joints once a year and renew it when it starts to fail.
Where do you work from?
Our base is Crawley. Our area covers South East England, London and Scotland.
Will it make a mess?
Tidy work is part of the job. We protect what’s around the joints.
Do you do commercial work?
Yes. Commercial and hotel work is a large part of what we do. We can talk about working times when we quote.
Should I try DIY first?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
When something else is needed
A few problems are outside what sealant work can do:
- Damp that isn’t coming from the joint
- Failed render or damaged cladding panels
- Cracking across the wall rather than at a joint
If you are not sure, just call 0345 464 0079 or email us and we’ll give you a straight answer.
Joints and surfaces we work on
- Concrete & block
- Joints between brick and frames
- Brickwork movement joints
- Render & cladding joints
- Façade panels
- Copings & trims