Hampshire · England
External Mastic in Havant
Sealing brickwork movement joints, render, cladding and façade joints for Havant, backed by a 12-month guarantee. Ask us for a quote.
- Old sealant gone brittle and cracked
- Joints pointed up with cement by mistake
- Plants rooting in failed movement joints
How we handle external mastic in Havant
A movement joint is a deliberate break that lets a wall expand and contract. Its sealant has to flex with the building, season after season, and when it fails, the wall takes the strain and water finds a way in. Typical jobs include joints with sealant missing in places and panel joints letting water in, on concrete & block, joints between brick and frames and render & cladding joints.
Extensions are a common sight on houses around Havant, and the line where an extension meets the original house is a common leak point. Getting the joint depth right matters as much as the sealant itself.
All of our work is guaranteed for twelve months.
- Place
- Havant (PO9, PO11, PO7)
- Region
- Hampshire
- Cover
- A year, on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Honest limits
To be straight with you, some problems need a different trade:
- Cracked brickwork or render that needs a builder or plasterer
- Structural movement, which needs a surveyor or engineer
- Walls that need new movement joints cut into them
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think before you book.
Joints and surfaces we work on
- Joints between brick and frames
- Render & cladding joints
- Copings & trims
- Façade panels
- Brickwork movement joints
- Concrete & block
Common questions in Havant
Is Havant in your area for external mastic?
Yes, Havant is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job.
Do you work for landlords with property near Havant station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before we start.
Where are you based?
Mr Mastic is based in Crawley. We cover Havant and the rest of Hampshire, along with the rest of our area.
Do you work at height?
It depends on the building. Send us pictures and a rough idea of the height.
Is there any odour?
It depends on the product. Some products have a noticeable smell, others very little.
Do you remove the old sealant?
Yes. We cut out all the old sealant and clean the joint before applying anything new.
What information do you need?
Tell us what needs doing and where, with pictures by email if possible. We’ll ask anything else we need to know.
How long does external mastic take?
A typical job takes a few hours for a handful of joints, longer for a whole elevation. We’ll confirm how long when we quote.
How the job changes by surface
Cladding and façade panels
Panels heat up and cool down quickly, so the joint sealant has to cope with frequent movement. We choose the product to suit.
Joints between dissimilar materials
Wherever two materials meet, they move differently. A flexible sealant bridges the two.
How to look after the new joints
So the new joints stay in good condition:
- Walk round the building once a year and look at the joints
- Leave the joints unpainted unless we’ve said otherwise
- Clear growth from the base of walls and joints
- Show decorators and builders where the movement joints are
Avoid pressure-washing straight into the joints. A strong jet can damage the edges of the bead.
Leave a failed movement joint and water keeps getting into the wall. That can lead to damp patches, staining and frost damage which cost more to put right than the joint.
Nearby places to Havant
Also in Havant
When to call us in Havant
Sunlight, wet weather and frost wear exterior sealant down. In time it goes hard, crazes on the surface and stops stretching, so the next time the wall moves, it splits or pulls away.
Keep an eye out for any of the following:
- Gaps where render, brick and frames meet
- Sealant that has lost its bond to the brick or render
- Water getting into walls through failed joints
- Movement joints with cracked, split or missing sealant
Managing a site like Trosnant Infant School? Then its movement joints, gutters and trims need looking after like any other building’s.
Questions to ask before you book
- Whether they seal over old material or remove it
- How the colour is chosen
- Are they insured?
- What happens if they find a problem under the old sealant
What happens if it’s left?
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That protects surfaces like brick, render and concrete. A stiffer product can damage the joint edge as it fails. In a family home in Havant, a failed seal around a bath or a frame lets water into places you can’t see, such as under the floor, behind a panel or into a wall. Left alone, that means rot, damp and a bigger repair.
Combining jobs into one visit is normally more efficient than separate visits, so tell us about everything that needs sealing. You will get one clear quote for the whole job.
Why book with us
- Trusted Arbo and Everbuild sealants
- Sealant colour chosen to suit
- Colour agreed with you before we start
- Homes, businesses and hotels
Read how sealant jobs are priced and customer reviews.
What happens on the day
Before we leave, we go over the finished joints with you and explain the cure time. The visit itself normally takes anything from a few hours to several days, depending on the building, depending on how much there is to do. A visit in Havant needs access to the work and a place to park close by. For outside work, let us know about side access, gates and any upper-floor joints.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
How to prepare
- Keep children and pets away from the work area
- Tell us about any previous sealing or DIY attempts
- For indoor joints, keep the area dry beforehand if you can
How to get a quote
We do not publish a price list. Instead, your job gets its own clear quote. To get started, ring 0345 464 0079 or drop us an email.
Related advice
For landlords and businesses
In hotels, rooms out of use cost money, so we plan the work room by room. We have worked in hotels as well as homes and businesses.
If you manage several properties in or around Havant, several properties can be quoted together. Just tell us the addresses and what each one needs.
What external mastic looks like in Havant
Havant is within about 2 miles of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That is hard on movement joints and outside wall joints, especially on the side facing the sea. London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Letting a property close to Havant station? Then split movement joints are easy to miss on a rental until damp shows inside. For an older house near a landmark such as St Francis, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Havant is about 18 miles east of Southampton, in Hampshire. If you need external mastic in Havant, please call 0345 464 0079 or send us an email for a quick quote. We cover Hampshire from our Crawley base. We cover 683 towns and villages across Hampshire.
We work across PO9, PO11 and PO7 for external mastic. Streets in the area include Colemore Square, Market Parade and Juniper Square, and we cover them all. Havant sits on or near the A27 and A3(M), so getting to you is simple. We also cover the places around Havant: Leigh Park (1 mile north), Denvilles (1 mile south-east), Durrants (2 miles north-east), Langstone (2 miles south) and Warblington (2 miles south-east). Within a short drive, we also cover Gosport (8 miles south-west), Fareham (9 miles west), Horndean (3 miles north), Hedge End (14 miles west), Petersfield (10 miles north) and Locks Heath (12 miles west). Havant is one of the larger places we cover in Hampshire.
Local landmarks in Havant
We work in homes and buildings around The Perseverance pub, St Albans Church and Havant College, among other places. The closest station to Havant is Havant station, about 0.6 miles south of the centre. Nearby you’ll also find Havant War Memorial Hospital (0.6 miles south) and Havant Museum (0.9 miles south-east). Open spaces near Havant include Southmoor Nature Reserve.