Hampshire · England
External Mastic in Deane
Sealing brickwork movement joints, render, cladding and façade joints for householders, landlords and businesses in Deane. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Weeds or debris growing in open joints
- Old sealant gone brittle and cracked
- Sealant pulling away from one side of the joint
How it works
When we get to you, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. Most jobs then take anything from a few hours to several days, depending on the building. For a village or hamlet like Deane, 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.
- First we look over the joints with you, agree which to renew and talk through access.
- We cut out the failed sealant and rake out any dirt or growth.
- Both sides are cleaned back to sound material and primed if needed.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
How to prepare
- On commercial sites, let us know about site rules
- Plan for the work area to be out of bounds to pets and children
- Clear items away from the joints we’re working on
Get a quote
There’s no standard price list, as no two jobs are quite the same. Instead, we send you a clear quote for your job. To arrange one, call 0345 464 0079 or send us an email.
Advice
About our external mastic in Deane
A movement joint is only as good as its depth. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, leaving it bonded to two faces so it can move with the wall. We work on brickwork movement joints, concrete & block and copings & trims, and people most often call us about gaps where render, brick and frames meet and weathered mastic that no longer stretches.
Outside joints can only be sealed when they’re dry, so work in Deane 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 are covered after we’ve gone.
- Where
- Deane (RG25)
- Region
- Hampshire
- Cover
- 12 months on all our work
- Quote
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Questions from Deane
Can you help a landlord with a rental near Overton station?
Yes. We work for landlords and agents as well as householders. Just ring 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear price.
Is Deane in your area for external mastic?
Yes. Our work covers London and the South East, and Deane is part of that. You can phone 0345 464 0079 or email us and let us know what needs doing.
Why is there a gap in my brick wall?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It’s sealed with a flexible sealant, not mortar.
Will you leave a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
Does someone need to be in?
We need access to the joints, so we will agree that with you when we book. Indoors, that usually means someone at home.
Are you insured?
Yes. We’re fully insured, and we’ve been doing sealant work for more than 20 years.
What does external mastic cost?
Size, access and the old material all affect the cost. Ask us for a quote and we will talk you through it.
Can you reach joints on upper floors?
It depends on the building. Tell us the height, the number of joints and what’s below them and we will confirm how they can be reached safely.
Places near Deane
What else we do in Deane
Looking after it afterwards
Simple care keeps the joints in good condition. Our advice:
- Make sure movement joints are not pointed over
- Point out the joints to other trades
- Check the sealant is paintable before painting near it
- Act on the first splits you see
Keep pressure washers away from the sealant. A strong jet can damage the edges of the bead and let water in behind.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.
Why deal with it now?
Pointing a movement joint with mortar might seem a neat fix, but it locks the joint solid. The wall then cracks somewhere else. A flexible sealant over backing rod is what the joint needs. Around Deane, 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: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
Why choose Mr Mastic in Deane
- A 12-month guarantee on all work
- Approved under the ARBOMaster scheme
- Quality sealants from Arbo and Everbuild
- More than 20 years in sealant work
Read our cost guide or our reviews.
Quotes for external mastic in Deane
Every job gets its own quote. These are the things that affect it:
- Working hours on commercial sites
- Whether there’s mould to deal with
- How much old sealant there is and how hard it is to remove
- The number of rooms or windows
Leaving a failed joint generally makes the job bigger, not smaller, because water and mould keep working on it. If you’re not sure whether it needs doing, ring 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
Helping us quote
There’s no need for technical detail. It helps if you can tell us:
- What’s wrong with the joints now
- Any access issues, like height or stairs
- Roughly how big the job is
- Any previous sealing or DIY work
For external mastic in Deane, phone 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and you will get a clear quote before work begins.
Deane buildings and 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.
If you live in an older home near Church of All Saints, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Deane is about 5 miles west of Basingstoke, in Hampshire. Every kind of property in Deane is covered for external mastic, old or new, large or small. The work is guaranteed for a year. Deane is one of 683 towns and villages in Hampshire we cover. Reading is on our list too, about 17 miles from Deane.
Jobs for external mastic in RG25 is quoted and booked the same way as anywhere else. If you are just outside Deane, we cover Oakley (2 miles east), Overton (2 miles west), Quidhampton (2 miles west), Newfound (2 miles east) and North Waltham (2 miles south-east). We also work in nearby towns such as Basingstoke (5 miles east), Winchester (14 miles south), Andover (12 miles west), Alton (12 miles south-east), Tadley (8 miles north-east) and Hook (12 miles east).
Local landmarks in Deane
Deane’s nearest station is Overton station, roughly 2 miles west. Other landmarks nearby include Park Prewett Hospital (4.8 miles north-east). Open spaces near Deane include Farleigh Hill.
Common problems we fix in Deane
If plants are growing out of a joint, the sealant has generally failed or was never there. Roots and dirt hold water against the wall.
Look out for these signs:
- Failed seals between different materials
- Damp patches traced to an open external joint
- Sealant that has lost its bond to the brick or render
- Leaking joints around cladding and façade panels
Letting a property close to Overton station? Then split movement joints are easy to miss on a rental until damp shows inside.
Questions to ask before you book
- Who turns up on the day
- Whether they seal over old material or remove it
- What insurance they hold
- Which sealant they’ll use, and why
How the job changes by surface
Concrete and blockwork
Concrete faces can be dusty and porous, so cleaning and priming matter. We prime where the sealant needs it.
Render joints
Render has movement joints and stop beads that need sealing. They’re resealed in a sealant that suits the render.
When something else is needed
Some problems need a builder, plumber or other trade rather than us:
- Subsidence or other structural problems
- Cracking across the wall rather than at a joint
- Loose or hollow render, which needs re-rendering
If in doubt, phone 0345 464 0079 or drop us an email and we will say what we think.
Where we work in Deane
- Copings & trims
- Brickwork movement joints
- Render & cladding joints
- Concrete & block
- Joints between brick and frames
- Façade panels