Hampshire · England
Langstone External Mastic
External mastic across Langstone and nearby, with old sealant always removed completely.
- Leaking joints around cladding and façade panels
- Rigid filler in a joint that should flex
- Plants rooting in failed movement joints
About our external mastic in Langstone
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. We work on brickwork movement joints, façade panels and joints between brick and frames, and people most often call us about rain getting behind render or cladding at a joint and old sealant gone brittle and cracked.
Outside joints can only be sealed when they’re dry, so work in Langstone is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
We stand behind the work with a 12-month guarantee, so you’re not left on your own once the job is done.
- Place
- Langstone (PO9, PO11)
- Region
- Hampshire
- Cover
- 12 months on all our work
- Price
- A clear price before we start
- Call
- 0345 464 0079
- Updated
- 26 October 2026
How we quote for external mastic
Jobs vary more than people expect. What affects the quote:
- Access and height
- The number and length of the joints
- When we can work, for business premises
- The number of rooms or windows
Leaving a failed joint normally makes the job bigger, not smaller, because water and mould keep working on it. If you are unsure, ring 0345 464 0079 or send us an email and we will give you an honest view and a quote.
Asking for a quote
To help us quote quickly, please include:
- Pictures of the joints, sent by email
- Access, such as stairs, a lift or height
- The rough size of the job
- If it’s domestic, commercial or a hotel
If you are in Langstone and need external mastic, call 0345 464 0079 or send us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Walls and rooflines in Langstone
Langstone is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. With historic houses such as Warblington Castle (about 0.8 miles north-east) nearby, there’s older building stock in the area around Langstone as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
If you look after a building such as Bosmere Junior School, its movement joints, gutters and trims need looking after like any other building’s. Letting a property close to Havant station? Then split movement joints are easy to miss on a rental until damp shows inside.
Langstone is about 2 miles south of Havant, in Hampshire. Langstone gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. 683 places in Hampshire are on our list.
Our applicators cover all of the PO9 and PO11 postcode area for external mastic. External mastic is available to properties on Mill Lane, Langstone Road and Langstone High Street and the roads around them. Main roads around Langstone include the A3023, so getting to you is simple. We also cover the places around Langstone: Warblington (1 mile east), Northney (1 mile south-east), Denvilles (1 mile north-east), Stoke (1 mile south) and North Hayling (1 mile south-east). We also work in nearby towns such as Gosport (8 miles west), Fareham (9 miles west), Horndean (5 miles north), Hedge End (15 miles west), Waterlooville (4 miles north-west) and Petersfield (12 miles north).
Near you in Langstone
We work in homes and buildings around The Royal Oak pub and Warblington School. For rail, the closest station is Havant station, about 1.1 miles north. Nearby you will also find Warblington Castle (0.8 miles north-east) and Havant Museum (0.8 miles north). Not far away are Southmoor Nature Reserve.
Questions from Langstone
Do you work for landlords with property near Havant station?
Yes, we work for letting agents and landlords. You can ring 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before we start.
Will you come out to Langstone?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Do you guarantee your work?
Yes. All our work carries our one-year guarantee.
How much does external mastic cost in Langstone?
Size, access and the old material all affect the cost. Call for a quick quote and we’ll talk you through it.
Can you reach joints on upper floors?
It depends on the building. Send us photos and a rough idea of the height and we will confirm how they can be reached safely.
Should I point up the gap in my brickwork?
No, not if it’s a movement joint. Pointing it stops it working, and the wall may crack nearby. We’ll reseal it with a flexible sealant.
Are you insured?
Yes. Mr Mastic is fully insured, and we have been doing sealant work for more than 20 years.
What is backing rod for?
The foam is closed-cell backing rod. It stops the sealant going in too deep and bonding to three sides so it can flex with the joint.
Nearby places to Langstone
Other services in Langstone
What we can’t put right
New sealant can’t fix everything, and we will tell you before work begins. It won’t solve:
- Adding movement joints to masonry that has none
- Cracking across the wall rather than at a joint
- Movement that is more than a sealant joint can take
If you’re not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer before booking.
Surfaces we seal
- Brickwork movement joints
- Copings & trims
- Render & cladding joints
- Concrete & block
- Façade panels
- Joints between brick and frames
For landlords and businesses
We also work for property managers and facilities teams. We can quote a run of properties together.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. Several properties can be quoted together.
How the visit works
We keep the work tidy and contained to the joints we’re treating. Expect the work to take a few hours to a few days, depending on the length of joint and the access, and we tell you how long to leave it before we go. Somewhere as small as Langstone, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
How to prepare
- Keep children and pets away from the work area
- Move anything stored near the joints
- Mention any tricky access
How to get a quote
Every job is quoted individually. Simply call 0345 464 0079 or email us and describe the job, and pictures are welcome.
Related advice
Do you need external mastic in Langstone?
Joints sealed without backing rod, or far too deep, rarely last. Sealant bonded to three sides has nowhere to go and tears as soon as the joint widens.
Keep an eye out for these signs:
- Plants rooting in failed movement joints
- Joints with sealant missing in places
- Water getting into walls through failed joints
- Old sealant gone brittle and cracked
In the older streets around Saint Nicholas' Chapel, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Before you book anyone
- Whether they seal over old material or remove it
- Is VAT in the price?
- What product goes in the joint
- The length of the guarantee
Why deal with it now?
The longer a joint stays open, the more water the wall takes in. In cold weather, frost can damage wet brick and render near the open joint, so the problem grows beyond the joint itself. Older cottages and farmhouses around Langstone can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
The cost reflects the work involved, not a rough estimate. That’s why we ask a few questions first and give you a clear price before work begins.
Why book with us
- Approved under the ARBOMaster scheme
- Over 20 years’ experience
- White, clear, grey or another colour, product permitting
- Fully insured
Take a look at how sealant jobs are priced or customer reviews.
Keeping the joints in good condition
How long the joints last depends on use and care. Here’s what we suggest:
- Look over the joints every year, ideally after winter
- Show decorators and builders where the movement joints are
- Never let anyone fill a movement joint with mortar
- Get split or bare joints resealed while the damage is small
Have a quick look at the joints each spring. Watch for splits, edges coming away or growth in the joint.
Water getting behind cladding or render can go unnoticed for a long time. When it finally shows inside, the joint may have been open for years.