Hampshire · England
External Mastic in Bartley
External mastic in Bartley from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Plants rooting in failed movement joints
- Joints with sealant missing in places
- Old sealant gone brittle and cracked
What happens on the day
At the end, we look at the finished work together and tell you how long to leave it. The work normally takes anything from a few hours to several days, depending on the building, depending on the size of the job. For a village or hamlet like Bartley, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
Preparing for the visit
- Mention any parking rules near the property
- Let us know about stairs, lifts or work at height
- Let us know about earlier repairs to the joints
Ask for a quote
Want a quote for external mastic? Please call 0345 464 0079 or send us an email with a few details. We’ll explain what we’d do and send you a clear quote before we start.
Advice
How we handle external mastic in Bartley
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 use one wherever it does. If you have sealant pulling away from one side of the joint and panel joints letting water in, we can help, on brickwork movement joints, render & cladding joints and copings & trims alike.
External sealant needs dry, clean surfaces, so work around Bartley is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
Our work is backed for twelve months.
- Where
- Bartley (SO40)
- Wider area
- Hampshire
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Keeping the joints in good condition
So the new joints stay in good condition:
- Make sure movement joints are not pointed over
- Fix overflowing gutters above sealed joints
- Clear growth from the base of walls and joints
- Tell anyone working on the walls about the movement joints
Do not paint over the new sealant unless we’ve said the product is paintable. Many exterior sealants are not designed to be painted.
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.
Nearby places to Bartley
Also in Bartley
Common problems we fix in Bartley
Many joints fail because they were sealed too deep or with nothing behind them. If the sealant sticks to the back as well as the sides, it cannot stretch and rips as the joint opens.
Keep an eye out for any of the following:
- Panel joints letting water in
- Weathered mastic that no longer stretches
- Moss and dirt in joints with no sealant left
- Brick movement joints where the sealant has split
Managing a site like Bartley Church of England Junior School? Then its movement joints, gutters and trims need looking after like any other building’s.
Comparing quotes
- What happens if the job turns out different
- What the cure time is
- How much experience the applicator has
- How the colour is chosen
Common questions in Bartley
Will you come out to Bartley?
Yes, we do. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Can you do external mastic in Bartley?
Yes, Bartley is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job.
What’s an expansion joint in brickwork?
Brickwork, render and cladding all move a little, and planned joints take up that movement. It’s closed with backing rod and a flexible sealant.
What does external mastic cost?
It depends on the job, so we quote each one individually. To get one, ring 0345 464 0079 or drop us an email and tell us what needs doing and where.
How long before the joint can be used?
Cure times vary by product and the conditions. Before we leave, we’ll tell you the cure time.
Where are you based?
We work from Crawley. We cover Bartley and the rest of Hampshire, along with the rest of our area.
I rent my home. Can I book you?
Yes. Ask your landlord first, and we can send them the quote if that helps.
Will you leave a mess?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
When it isn’t the sealant
It helps to know what we can’t do:
- Loose or hollow render, which needs re-rendering
- Damp that is not coming from the joint
- Adding movement joints to masonry that has none
Not sure which it is? You can call 0345 464 0079 or send us an email and we’ll tell you honestly.
Where we work in Bartley
- Concrete & block
- Joints between brick and frames
- Façade panels
- Brickwork movement joints
- Copings & trims
- Render & cladding joints
How the job changes by surface
Brickwork movement joints
Brick walls have vertical movement joints to absorb expansion. We reseal them with a low-modulus sealant over backing rod coloured to suit the wall.
Render joints
Render has movement joints and stop beads that need sealing. They’re resealed in a sealant that suits the render.
What affects the cost of external mastic
Every job gets its own quote. These are the things that affect it:
- The size of the job
- How many rooms, windows or areas are involved
- Which sealant suits the joint
- Mould in or behind the old joints
What it costs depends on the size of the job, how much old material has to come out and how easy the joints are to reach. You will have a clear quote before any work starts, so you know where you stand.
Helping us quote
What to tell us when you ask for a quote:
- Access, such as stairs, a lift or height
- What the problem is, such as mould, gaps, leaks or cracking
- If someone has resealed it before
- The rough size of the job
To get a quote, ring 0345 464 0079 or send us an email with the location and a short description of the problem. We’ll give you a clear quote before any work starts.
What external mastic looks like in Bartley
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Rented homes near Ashurst New Forest station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Bartley is about 2 miles west of Totton, in Hampshire. If you need external mastic in Bartley, it’s easy to get a quote: please ring 0345 464 0079 or email us. We cover Hampshire from our Crawley base. Across Hampshire, we cover 683 places, and Bartley is one of them. There’s also a page for Southampton, roughly 7 miles from Bartley.
Work in SO40 works the same way as everywhere else we cover. If you need external mastic at a property on Chinham Road, Shepherds Close and Pundle Green or anywhere close by, our applicators can take on the job. Neighbouring places we cover for external mastic include Cadnam (1 mile north-west), Winsor (1 mile north-east), Copythorne (1 mile north), Woodlands (1 mile south-east) and Netley Marsh (1 mile east). Within a short drive, we also cover Winchester (15 miles north-east), Eastleigh (10 miles east), Chandler's Ford (9 miles north-east), Hedge End (11 miles east), Lymington (11 miles south) and Romsey (6 miles north-east).
Around Bartley
Typical jobs here are in homes near Haywain pub. The nearest railway station is Ashurst New Forest station, roughly 2.2 miles south-east. A little further out are National Dairy Museum (2.7 miles south-east) and Tatchbury Mount Hospital (1.8 miles north-east). Not far away are Copythorne Common.
Should I try it myself first?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.