Hampshire · England
Warsash External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for householders, landlords and businesses in Warsash. Fully insured, ARBOMaster approved and guaranteed for a year.
- Joints pointed up with cement by mistake
- Weathered mastic that no longer stretches
- Gaps where render, brick and frames meet
External mastic for homes and businesses in Warsash
A movement joint is only as good as its depth. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, so it bonds to the two sides only and can stretch. If you have rigid filler in a joint that should flex and rain getting behind render or cladding at a joint, we can help.
Outbuildings, garages and conservatories around homes in places like Warsash add more joints to look after. Leaks normally start at a gutter end, a garage door frame or where an extension meets the house.
You are covered for a year from the day we finish. If there’s a problem with it, please phone 0345 464 0079 or drop us an email.
- Location
- Warsash (SO31)
- Wider area
- Hampshire
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What the job involves on each surface
Render joints
Water behind render can lead to blown patches. A sound joint keeps the render dry behind and helps it last.
Concrete and blockwork
Wide joints in concrete need the depth controlling carefully. Backing rod sized to the joint sets it so the sealant isn’t too deep.
Warsash: your questions answered
Does living near the coast affect external mastic in Warsash?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Is Warsash within the area you cover?
Yes, we do. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
When is the sealant fully cured?
That depends on the sealant used, so follow the cure time we give you.
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. That way it bonds to the two sides only and can stretch.
Is there a guarantee?
Yes, always. There’s a 12-month guarantee on every job, wherever you are.
Where do you work from?
Mr Mastic is based in Crawley. Our applicators cover Warsash.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done and we’ll quote it together.
What do you put in the joint?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We will tell you what we are using and why.
External mastic in Warsash: local notes
Warsash is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. 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 Mary, the joints between older walls, newer extensions and the roofline need a sealant that can move. Letting a property close to Swanwick station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Warsash is about 4 miles west of Fareham, in Hampshire. Homes, rented property, offices and hotels in Warsash can book us for external mastic, old or new, large or small. Every job comes with our one-year guarantee. Across Hampshire, we cover 683 places, and Warsash is one of them. There’s also a page for Southampton, roughly 6 miles from Warsash.
Work in SO31 is quoted and booked the same way as anywhere else. If you need external mastic at a property on Church Road, Wild Rose Crescent and Willow Herb Close or anywhere close by, our applicators can take on the job. We also cover Sarisbury Green (1 mile north), Locks Heath (1 mile north-east), Hook (1 mile south-east), Hook Park Estate (1 mile south) and Abshot (1 mile south-east). We also work in nearby towns such as Winchester (14 miles north), Gosport (7 miles south-east), Havant (13 miles east), Eastleigh (8 miles north), Fareham (4 miles east) and Horndean (13 miles east).
Around Warsash
Locally, jobs take us to homes and businesses close to Brookfield Community School and Language College, Hamble Common and Jolly Farmer Public House and the streets around them. For rail, the closest station is Swanwick station, roughly 1.6 miles north-east of the centre. Nearby you’ll also find Coldeast (0.9 miles north) and Bursledon Brickworks Industrial Museum (2.1 miles north). The countryside around Warsash includes Holly Hill Woodland Park.
Honest limits
Sealant is not the answer to every problem, and we’d rather say so up front. It won’t solve:
- Movement that’s more than a sealant joint can take
- Walls that need new movement joints cut into them
- Cracks in the bricks or render themselves, away from the joints
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we’ll tell you honestly before booking.
Surfaces we seal
- Render & cladding joints
- Concrete & block
- Copings & trims
- Brickwork movement joints
- Façade panels
- Joints between brick and frames
Why deal with it now?
A failed movement joint lets water into the wall, behind render and cladding. Dealing with it early keeps the repair to the joint, instead of the wall and finishes around it. Around Warsash, water from a failed joint in an older home can soak into timber and plaster, which is far harder to put right than the sealant itself.
Doing several joints on one visit is normally more efficient than separate visits, so tell us about everything that needs sealing. We will give you a clear quote for the lot.
Why us?
- A 12-month guarantee on all work
- Approved under the ARBOMaster scheme
- We agree the colour with you first
- Neat joints and a tidy finish
Read what affects the cost and what customers say.
What affects the quote in Warsash
For a quick quote, just ask. The main things that affect it are:
- Mould in or behind the old joints
- Access and height
- How much there is to do
- Which sealant suits the joint
We do not show prices on the website, because the cost depends so much on the job itself. Call for a quick quote and we will talk you through it.
Helping us quote
To help us quote quickly, please include:
- If someone has resealed it before
- Where the property is
- What’s wrong with the joints now
- The rough size of the job
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we’ll talk you through the work.
Nearby places to Warsash
More services for Warsash
How it works
There isn’t much for you to do on the day. Point us to the joints and we will get on with it. The work itself takes a few hours for a handful of joints, longer for a whole elevation from start to finish. Parking around Warsash is generally easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- Old sealant and any debris are cut and raked out.
- The joint faces are cleaned and primed where the sealant needs it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Preparing for the visit
- Mention any parking rules near the property
- Mention if the joints have been sealed before
- Mention any tricky access
How to get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. When it suits you, call 0345 464 0079 or drop us an email.
Related advice
Do you need external mastic in Warsash?
Sunlight, wet weather and frost wear exterior sealant down. In time it goes hard, crazes on the surface and stops stretching, so the joint eventually tears or comes away from one side.
Most people get in touch when they notice something like this:
- Movement joints with cracked, split or missing sealant
- Moss and dirt in joints with no sealant left
- Weathered mastic that no longer stretches
- Sealant pulling away from one side of the joint
Schools such as Hook-With-Warsash Church of England Academy are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
Comparing quotes
- Whether you can choose the colour
- What the quote includes, VAT included or not
- How much experience the applicator has
- Is the old sealant removed completely?
DIY versus a professional finish
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
A careful DIYer can reseal a simple joint, 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.