Hampshire · England
North Boarhunt External Mastic
Professional external mastic in and around North Boarhunt, with old sealant always removed completely.
- Joints with sealant missing in places
- Failed sealant between panels on a façade
- Cracked joints where brick meets render or frames
About our external mastic in North Boarhunt
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible exterior sealant takes up that movement. If you are dealing with hard, crazed mastic that has stopped moving and movement joints filled with mortar instead of sealant, we can help.
Around North Boarhunt, 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.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we’ll put it right.
- Location
- North Boarhunt (PO17)
- Region
- Hampshire
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Aftercare tips
No joint lasts for ever, but care makes a real difference. Our tips:
- Never let anyone fill a movement joint with mortar
- Get split or bare joints resealed while the damage is small
- Wash walls gently around the sealant
- Point out the joints to other trades
Make sure anyone working on the wall later knows where the movement joints are. They should be kept open and resealed, not filled.
Leave a failed movement joint and water keeps getting into the wall. Over time it can mean damp inside, stained render or frost-damaged brick.
The process
On the day, there’s very little for you to do. Point us to the joints and we will get on with it. The job generally takes a few hours for a handful of joints, longer for a whole elevation from start to finish. Somewhere like North Boarhunt needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- Let us know if you’ve seen damp or leaks
- For business premises, tell us about site rules or sign-in
- Clear the area around the work
Ask for a quote
To get a quote, call 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You’ll have a clear quote before we start.
Advice
What affects the cost of external mastic
For a quick quote, just ask. The main things that affect it are:
- Access and height
- How many rooms, windows or areas are involved
- The number and length of the joints
- The type of sealant required
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you’re not sure whether it needs doing, phone 0345 464 0079 or email us for an honest opinion and a quote.
What to tell us for a quote
Photos by email are helpful but not essential. Please mention:
- What the problem is, such as mould, gaps, leaks or cracking
- If it’s domestic, commercial or a hotel
- Where the job is, and your postcode
- How many joints, rooms or windows are involved
Getting a quote is simple: let us know the job and the location. Photos by email help us understand the job.
Do you need external mastic in North Boarhunt?
Buildings move more than people expect. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. The sealant in the movement joints takes that strain.
The most common problems we see are:
- Damp patches traced to an open external joint
- Moss and dirt in joints with no sealant left
- Joints where the bead has come unstuck
- Failed sealant between panels on a façade
Letting a property close to Portchester station? Then split movement joints are easy to miss on a rental until damp shows inside.
Comparing quotes
- When the joint can take water or movement
- How long the guarantee is
- Are they insured?
- Whether they seal over old material or remove it
Questions from North Boarhunt
Do you work for landlords with property near Portchester station?
Yes, rental work is part of what we do. Just call 0345 464 0079 or email us and tell us about the property, and we will give you a clear price.
Do you cover smaller places like North Boarhunt?
Yes. North Boarhunt is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
How long will you be here?
Typically it takes anything from a few hours to several days, depending on the building. Bigger jobs take longer, and we will say how long yours will take.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice, and we’ll tell you what we are using.
When is the sealant fully cured?
Many sealants skin over quickly but take longer to cure fully. We will give you the cure time for the product we used.
How much does external mastic cost in North Boarhunt?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. You will get a clear quote before work begins.
Can you quote for more than one area?
Yes. Several rooms, windows or areas can go on one quote.
What’s an expansion joint in brickwork?
It’s a deliberate gap that lets the wall expand and contract without cracking. It should be filled with flexible sealant, never mortar.
North Boarhunt buildings and the weather
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.
If you live in an older home near Church of the Holy Trinity, the joints between older walls, newer extensions and the roofline need a sealant that can move. Managing a site like Newtown Soberton Infant School? Then its movement joints, gutters and trims need looking after like any other building’s.
North Boarhunt is about 4 miles north-east of Fareham, in Hampshire. We provide external mastic to homes and businesses in North Boarhunt and nearby. 683 places in Hampshire are on our list, from the larger towns to small villages. Portsmouth is on our list too, about 7 miles from North Boarhunt.
Work in PO17 is quoted and booked the same way as anywhere else. Local streets include Trampers Lane and Bere Farm Lane, all of which we cover. Nearby, we also carry out external mastic in Hundred Acres (1 mile north-west), Wickham Common (1 mile west), Boarhunt (2 miles south), Crockerhill (2 miles south-west) and Southwick (2 miles south-east). Larger places within reach include Winchester (14 miles north-west), Gosport (6 miles south), Havant (7 miles east), Eastleigh (10 miles north-west), Fareham (4 miles south-west) and Horndean (6 miles east).
Local landmarks in North Boarhunt
The closest station to North Boarhunt is Portchester station, about 3.3 miles south of the centre. Nearby you will also find Fareham Shopping Centre (3.2 miles south-west) and Portchester Castle (4.2 miles south). For a walk, there’s Portsdown Hill and St Clair's Meadow.
Places near North Boarhunt
What else we do in North Boarhunt
Can I do it myself?
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
For landlords and businesses
We work for letting agents and landlords as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
Why it’s worth doing now in North Boarhunt
It often makes sense to reseal all the failing joints on an elevation together. Joints of the same age tend to fail together and it means sorting access once. Around North Boarhunt, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Why book with us
- Over 20 years’ experience
- Quality sealants from Arbo and Everbuild
- Tidy, careful work
- Every job guaranteed for a year
See what affects the cost and customer reviews.