Reading · England
External & façade joints in Dunsden Green, Reading
External mastic for Dunsden Green, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Sealant that has lost its bond to the brick or render
- Moss and dirt in joints with no sealant left
- Brick movement joints where the sealant has split
How we quote for external mastic
The price is agreed before any work begins. It’s based on:
- The old material and how stubborn it is
- How many rooms, windows or areas are involved
- The number and length of the joints
- Any working-time requirements on site
Combining jobs into one visit is normally more efficient than separate visits, so tell us about everything that needs sealing. You’ll get one clear quote for the whole job.
Asking for a quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- Whether it’s a home or a business
- Whether it has been sealed before
- How we’d reach the joints
- Where the job is, and your postcode
Every job is quoted individually. Just phone 0345 464 0079 or send us an email with the details and send pictures if you have them.
External mastic in Dunsden Green, done properly
Getting the depth right is half the job. 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. Typical jobs include joints pointed up with cement by mistake and joints where the bead has come unstuck, on joints between brick and frames, concrete & block and façade panels.
External sealant needs dry, clean surfaces, so work around Dunsden Green is planned for dry weather. Tell us about access to all sides of the building, including outbuildings and garages.
All our work comes with a one-year guarantee.
- Where
- Dunsden Green (RG4)
- Region
- Reading
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before we start
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Also near Dunsden Green
Other services in Dunsden Green
Do you need external mastic in Dunsden Green?
A lot of failed joints come down to preparation: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The new sealant then lets go long before it should.
Look out for these signs:
- Movement joints filled with mortar instead of sealant
- Water getting into walls through failed joints
- Movement joints with cracked, split or missing sealant
- Cracked joints where brick meets render or frames
For an older house near a landmark such as All Saints Church, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
What your quote should include
- Which colour the sealant will be
- How long to leave it before use
- How hidden problems are handled
- What product goes in the joint
The process
On the day, we start by going over the job with you, so there are no surprises. Surfaces next to the work are protected before any work begins. Most jobs take a few hours to a few days, depending on the length of joint and the access. For a village or hamlet like Dunsden Green, 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.
- 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.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- Tell us if parking is tricky
- Try not to wet indoor joints just before the visit
- Mention if the joints have been sealed before
Ask for a quote
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job, and we’ll take it from there.
Related advice
Landlords, agents and businesses in Dunsden Green
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we’ll give you a quote.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Dunsden Green questions
Is Dunsden Green within the area you cover?
Yes, Dunsden Green is covered. 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.
Is Dunsden Green in your area for external mastic?
Yes. We work across London and the South East, and Dunsden Green is part of that. Just call 0345 464 0079 or email us with a few details of the job, and we’ll send you a clear quote.
Do you use backing rod?
Backing rod controls the sealant depth and keeps it off the back of the joint. Then the sealant bonds to two faces and can move.
Do you take out the old sealant first?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Do you seal joints where cladding meets other materials?
Yes. Different materials move at different rates, so a flexible sealant is needed where they meet. We choose one that suits both surfaces.
Will the new joint stand out?
The aim is a neat, even joint in a colour that suits the wall. We’ll talk through colour options before any work starts, matched as closely as the range allows.
Should I try DIY first?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Should I point up the gap in my brickwork?
No. A mortar-filled joint can’t move, so the wall cracks somewhere else instead. It needs a flexible sealant over backing rod.
DIY versus a professional finish
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.
If you’ve already had a go yourself, that is fine. We cut it out and start again.
Surface by surface
Brickwork movement joints
Clay brickwork grows slightly over its life and moves with the weather. That movement goes into the joint, so its sealant has to stay flexible.
Cladding and façade panels
Panel systems often rely on sealant between and around the panels. Each joint gets a sealant that suits the panel and its movement.
Outside joints around Dunsden Green
Historic houses like Greys Court (about 3.9 miles north) are a reminder that the area around Dunsden Green has older buildings as well as new. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. 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 look after a building such as St Martin's Catholic Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. Letting a property close to Reading station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
Dunsden Green is about 1 mile north-east of Caversham, in Reading. From the centre of Dunsden Green to the outskirts, we cover external mastic for every kind of property. Dunsden Green is one of 34 towns and villages in Reading where we work.
Jobs for external mastic in RG4 works the same way as everywhere else we cover. Nearby, we also carry out external mastic in Littlestead Green (1 mile west), Play Hatch (1 mile south), Caversham Park Village (1 mile south-west), Emmer Green (1 mile south-west) and Caversham (1 mile south-west). Larger places within reach include Norcot (4 miles south-west), West Reading (4 miles south-west), Tilehurst Within (5 miles south-west), Shinfield (6 miles south), Arborfield Garrison (8 miles south) and Horncastle (5 miles south-west).
Landmarks near Dunsden Green
We work in homes and buildings around Ali's Pond Local Nature Reserve, Highdown School and Sixth Form Centre and The Flowing Spring pub. Dunsden Green’s nearest station is Reading station, about 2.6 miles south-west. A little further out are Royal Berkshire Hospital (2.8 miles south) and Berkshire Medical Heritage Centre Museum (2.8 miles south). The countryside around Dunsden Green includes Sonning Hill and South Lake.
What sealant work cannot fix
We’d rather tell you now than do work that won’t last, so these are the limits:
- Walls that need new movement joints cut into them
- Subsidence or other structural problems
- Failed render or damaged cladding panels
Not sure which it is? You can call 0345 464 0079 or drop us an email and we’ll tell you honestly before you book.
Where we work in Dunsden Green
- Joints between brick and frames
- Copings & trims
- Concrete & block
- Façade panels
- Render & cladding joints
- Brickwork movement joints