Reading · England
External Mastic in Caversham
Sealing brickwork movement joints, render, cladding and façade joints in Caversham, with a one-year guarantee on every job. Call for a quick quote.
- Leaking joints around cladding and façade panels
- Joints with sealant missing in places
- Sealant pulling away from one side of the joint
External mastic for homes and businesses in Caversham
Low-level joints can usually be done from the ground. Where joints are higher up, tell us about the building when you get in touch and we will confirm what’s needed to reach them safely. We work on joints between brick and frames, brickwork movement joints and copings & trims, and people most often call us about water getting into walls through failed joints and weeds or debris growing in open joints.
Plenty of homes in a town like Caversham have been extended, and the joint where new wall meets old is a classic place for water to get in. Sealing it properly means the right joint depth and a flexible sealant, not a quick bead.
The work is covered for a year after we finish. If there’s a problem with it, please phone 0345 464 0079 or email us.
- Where
- Caversham (RG4)
- Region
- Reading
- Cover
- One year on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Your questions about external mastic in Caversham
Can you do external mastic in Caversham?
Yes. We work across London and the South East, and Caversham is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job.
Can you help a landlord with a rental near Reading station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before we start.
How often do external joints need resealing?
It varies with how exposed the wall is and how much the joint moves. Signs to watch for are cracking, hardening and gaps at the edges.
Can you seal joints between render and window frames?
Yes. Materials like render, brick, metal and uPVC all move differently, so a flexible sealant is needed where they meet. We choose one that suits both surfaces.
Can you seal over the old sealant?
No. New silicone will not bond to old silicone, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
Will you leave a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
How do I get a quote for external mastic in Caversham?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote and we will talk you through it.
What should I tell you?
A short description and the location. If we need more, we’ll ask.
Nearby places to Caversham
Also in Caversham
What happens if it’s left?
Sealing over the top of old mastic does not hold for long. New sealant doesn’t bond well to old, weathered sealant, so we always take the old sealant out. In a family home in Caversham, a failed seal around a bath or a frame lets water into places you cannot see, such as under the floor, behind a panel or into a wall. Whatever the joint, failed sealant only gets worse.
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
Why choose Mr Mastic in Caversham
- We never seal over old sealant
- Domestic, commercial and hotel work
- You choose the colour before work begins
- Trusted Arbo and Everbuild sealants
See our cost guide and what customers say.
What we do, step by step
Every visit runs the same way: we look at the joints together, protect the area around them, carry out the job and clear up. Most jobs take a few hours to a few days, depending on the length of joint and the access. For a job in Caversham, we need access to where the work is and somewhere nearby to park. If the job is outside, mention gates, side access and anything above ground floor.
- We look at every joint and agree a colour to suit the wall.
- 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.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any sign-in or site rules at work premises
- Mention any leaks or damp you’ve noticed
Getting a quote
If you’re in Caversham and need external mastic, call 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Read more
What affects the quote in Caversham
We quote each job individually. This is what makes a difference:
- The number and length of the joints
- The old material and how stubborn it is
- The type of sealant required
- How many areas need sealing
A failed joint rarely gets cheaper to fix by waiting. If you are unsure, ring 0345 464 0079 or drop us an email for an honest opinion and a quote.
What we need to know
You do not need to know the technical terms. It helps if you can tell us:
- Roughly how big the job is
- Pictures of the joints, sent by email
- What’s wrong with the joints now
- Whether it’s a home or a business
There’s no standard price list, because every job is different. Instead, your job gets its own clear quote. To arrange one, ring 0345 464 0079 or email us.
What the job involves on each surface
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. The old joint is removed and a sealant that bonds to both sides goes in.
Brickwork movement joints
Brick movement joints are often mistaken for a missing mortar line. If that’s happened, we rake it out and reseal it properly where it can be done safely.
Keeping the joints in good condition
Looking after new joints is easy, and it makes a real difference:
- Make sure movement joints aren’t pointed over
- Fix overflowing gutters above sealed joints
- Show decorators and builders where the movement joints are
- Act on the first splits you see
Do not paint over the new sealant unless we have said the product is paintable. Paint can crack on a flexible joint and spoil the finish.
Once a joint can’t move, the wall finds another way, often as cracks near the joint. Catch it early and you reduce the risk.
For landlords and businesses
Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we will quote.
What external mastic looks like in Caversham
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Mapledurham House (about 3 miles west) nearby, there’s older building stock in the area around Caversham as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
Rented homes near Reading station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets. If you look after a building such as The Hill Primary School, larger buildings have long runs of movement joint that eventually need resealing. If you live in an older home near Grace Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
Caversham is about 2 miles north of Reading, in Reading. Wherever you are in the RG4 postcode area, we cover external mastic for homes and businesses. 34 places in Reading are on our list, from the larger towns to small villages.
Here we cover the RG4 postcode area for external mastic. Local streets include Marshland Square, Church Road and Buckingham Gate, all of which we cover. With the B3345 close by, Caversham is simple for us to get to. We also cover the places around Caversham: Emmer Green (1 mile north-east), Caversham Park Village (1 mile north-east), Lower Caversham (1 mile south), Caversham Heights (1 mile west) and Littlestead Green (1 mile north-east). Further out, we also cover Norcot (3 miles south-west), Tilehurst Within (3 miles south-west), Shinfield (5 miles south), Arborfield Garrison (7 miles south-east), Horncastle (3 miles south-west) and Whitley Wood (4 miles south). Being one of Reading’s larger places, Caversham has every kind of property, from flats to offices.
Around Caversham
Typical jobs here are in homes near Chiltern Nursery Nurse Training School, The White Horse pub and Eldon Square and the streets around them. For rail, the closest station is Reading station, roughly 1.3 miles south. A little further out are Royal Berkshire Hospital (1.9 miles south) and Broad Street Mall (1.6 miles south). The countryside around Caversham includes South Lake and Sonning Hill.
When something else is needed
We will always be straight with you, so here’s what new sealant will not do:
- Loose or hollow render, which needs re-rendering
- Movement that’s more than a sealant joint can take
- Cracking across the wall rather than at a joint
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we’ll tell you honestly before you book.
What we seal
- Joints between brick and frames
- Copings & trims
- Brickwork movement joints
- Concrete & block
- Render & cladding joints
- Façade panels