Hampshire · England
External Mastic in Dummer
Specialist external mastic for Dummer: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Cracked joints where brick meets render or frames
- Water getting into walls through failed joints
- Panel joints letting water in
What the job involves on each surface
Cladding and façade panels
If the façade has a specified sealant, that is what we use, or one the system allows. Send us any details you have about the façade.
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. We cut out the old sealant and reseal with a product suited to both surfaces.
How we handle external mastic in Dummer
For buildings in Dummer, we reseal external joints of all kinds, from brick movement joints to cladding panels. The preparation is the same whatever the wall: clean, sound faces and a controlled depth. If you have sealant pulling away from one side of the joint and panel joints letting water in, we can put it right, on joints between brick and frames, brickwork movement joints and concrete & block alike.
In a village or hamlet like Dummer, older cottages and farm buildings often stand in the open, so walls and rooflines take the full force of wind and rain. Joints on those walls need a sealant that moves with the building and stays in place.
There’s a 12-month guarantee on every job.
- Place
- Dummer (RG25)
- Region
- Hampshire
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What we cannot put right
To be straight with you, some problems need a different trade:
- Render that is blown, hollow or coming away
- Walls that need new movement joints cut into them
- Damp that is not coming from the joint
If you’re not sure, just ring 0345 464 0079 or drop us an email and we will give you a straight answer.
Where we work in Dummer
- Façade panels
- Concrete & block
- Brickwork movement joints
- Copings & trims
- Render & cladding joints
- Joints between brick and frames
More services for Dummer
Outside joints around Dummer
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
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. For landlords with property near Micheldever station, split movement joints are easy to miss on a rental until damp shows inside.
Dummer is about 4 miles south-west of Basingstoke, in Hampshire. Every kind of property in Dummer is covered for external mastic. Every job comes with our 12-month guarantee. Dummer is one of 683 places in Hampshire where we work for external mastic. Our Reading page covers work nearby (18 miles or so).
All of RG25 is within our area for external mastic, from the main roads to the quietest streets. We cover properties on Down Street, Post Office Lane and Porters Close. We also cover the places around Dummer: North Waltham (2 miles west), Farleigh Wallop (2 miles east), Kempshott (2 miles north), Hatch Warren (2 miles north-east) and Oakley (3 miles north). Further out, we also cover Basingstoke (4 miles north-east), Winchester (13 miles south-west), Fleet (15 miles east), Andover (14 miles west), Alton (9 miles south-east) and Tadley (10 miles north).
What’s near Dummer
Typical jobs here are in homes near The Queen Inn and the streets around them. For rail, the closest station is Micheldever station, roughly 4.8 miles south-west. A little further out are Park Prewett Hospital (5 miles north). Not far away are Farleigh Hill.
Landlord and commercial work in Dummer
Failed sealant is one of the commonest items on a check-out report. We can quote for more than one property at once.
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
What affects the cost of external mastic
The price is agreed before any work begins. It’s based on:
- The amount of work
- Access and height
- How much old sealant there is and how hard it is to remove
- How many rooms, windows or areas are involved
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
What to tell us for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- Where the job is, and your postcode
- Any previous sealing or DIY work
- A few pictures by email, if you can
- The problem you’ve noticed
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.
FAQs for Dummer
Is Dummer within the area you cover?
Yes, Dummer is covered. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Do you cover Dummer for external mastic?
Yes, Dummer is within the area we cover. We work across London and the South East. Just phone 0345 464 0079 or drop us an email with a few details of the job.
Should I point up the gap in my brickwork?
No. A mortar-filled joint cannot move, so the wall cracks somewhere else instead. It needs a flexible sealant over backing rod.
How long will you be here?
As a guide, most jobs take a few hours to a few days, depending on the length of joint and the access. Bigger jobs take longer, and we will tell you how long to expect.
What information do you need?
Tell us what needs doing and where, with photos by email if possible. If we need more, we will ask.
Do you remove the old sealant?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
Is it worth trying it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
How much does external mastic cost in Dummer?
We don’t publish prices, because the cost depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
DIY versus a professional finish
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Keeping the joints in good condition
So the new joints stay in good condition:
- Make sure movement joints are not pointed over
- Keep water from gutters off the wall
- Get split or bare joints resealed while the damage is small
- Don’t let climbing plants root in the sealant
Do not let soil, plants or ivy build up against the new joints. Damp material against the sealant shortens its life.
Leaks behind façade panels and render often go unseen. When it finally shows inside, the joint may have been open for years, so it’s worth resealing at the first signs.
What happens on the day
Good joint work is mostly preparation, and we do not rush it. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours to a few days, depending on the length of joint and the access. Somewhere like Dummer needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- The old mastic and anything lodged in the joint is removed.
- 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.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Before we arrive
- Clear the area around the work
- Mention any parking rules near the property
- Try not to wet indoor joints just before the visit
How to get a quote
If you are in Dummer and need external mastic, phone 0345 464 0079 or send us an email. Tell us what the problem is and where, and we will agree the price before any work begins.