Reading · England
Caversham Heights External Mastic
Problem with your movement joints in Caversham Heights? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Panel joints letting water in
- Hard, crazed mastic that has stopped moving
- Movement joints with cracked, split or missing sealant
Do you need external mastic in Caversham Heights?
UV, rain and frost all age exterior sealant. Over the years it hardens, cracks on the surface and loses its give, so the joint eventually tears or comes away from one side.
Keep an eye out for these signs:
- Panel joints letting water in
- Weeds or debris growing in open joints
- Hard, crazed mastic that has stopped moving
- Cracked joints where brick meets render or frames
In the older streets around St. Andrew's Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
Before booking anyone
- When the joint can take water or movement
- What preparation is included
- Are they insured?
- Whether VAT is included
How we handle external mastic in Caversham Heights
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Some surfaces need a primer before sealing. We work on façade panels, concrete & block and render & cladding joints, and the jobs we see most are hard, crazed mastic that has stopped moving and joints with sealant missing in places.
Homes around Caversham Heights range from older cottages to newer houses, with walls and rooflines of every type. Older homes need their gutter and trim joints kept tight, newer ones their movement joints.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Where
- Caversham Heights (RG4)
- Wider area
- Reading
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
How it works
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, carry out the job and clear up. It usually takes a few hours for a handful of joints, longer for a whole elevation. A visit to Caversham Heights is planned like any other: the time, the access and where to park are agreed in advance. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- We start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- 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
- Keep children and pets away from the work area
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us about any previous sealing or DIY attempts
How to get a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and add photos by email if you can.
Read more
Looking after it afterwards
A little care helps the new joints last. Our advice:
- Have failed joints looked at early
- Wash walls gently around the sealant
- Keep water from gutters off the wall
- Look over the joints every year, ideally after winter
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.
Act while the splits are small. Then it’s a straightforward cut-out and reseal with no damage behind it to deal with.
Honest limits
Sealant is not the answer to every problem, and we’d rather say so up front. It will not solve:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Loose or hollow render, which needs re-rendering
- Cracks in the bricks or render themselves, away from the joints
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly before you book.
Where we work in Caversham Heights
- Copings & trims
- Joints between brick and frames
- Brickwork movement joints
- Façade panels
- Render & cladding joints
- Concrete & block
Should I try it myself first?
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Why it’s worth doing now in Caversham Heights
Water gets in through a failed movement joint. Resealing early keeps the job to the joint itself, instead of the wall and finishes around it. In an older home around Caversham Heights, damp from a failed joint can get into timber and plaster, and that’s a much bigger job than renewing the sealant.
What it costs depends on the size of the job, how much old material has to come out and access to the work. We give a clear quote before work begins, so you know where you stand.
Why us?
- Full insurance on every job
- We leave the area clean and tidy
- Arbo and Everbuild products
- Any old sealant cut out fully, not covered over
Take a look at how sealant jobs are priced and what customers say.
Surface by surface
Render joints
Render is weaker at the surface than brick, so a low-modulus sealant is kinder to the joint edges. Priming is done where the sealant calls for it.
Concrete and blockwork
Wide joints in concrete need the depth controlling carefully. Backing rod sized to the joint sets it.
Nearby places to Caversham Heights
What else we do in Caversham Heights
Caversham Heights questions
I let a flat near Reading station. Can you help?
Yes, landlords and agents are among the people we work for. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
Do you cover smaller places like Caversham Heights?
Yes, we do. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Will the new joint stand out?
We aim for a joint that suits the wall rather than one that jumps out. Colour is agreed with you before we begin from the range available.
Where do you work from?
We are a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
Are you ARBOMaster approved?
Yes. We hold ARBOMaster approved applicator status.
Is there any odour?
There can be a smell while the sealant cures, but it fades. Ventilation helps.
Are you fully insured?
Yes. We are fully insured for domestic and commercial work.
How long before the joint can be used?
Cure times vary by product and the temperature. Before we leave, we’ll tell you the cure time.
External mastic in Caversham Heights: local notes
Historic houses like Mapledurham House (about 2.1 miles west) are a reminder that the area around Caversham Heights 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, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
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. For site and facilities teams at buildings such as Caversham Primary School, its movement joints, gutters and trims need looking after like any other building’s.
Caversham Heights is about 1 mile west of Caversham, in Reading. Every kind of property in Caversham Heights can book us for external mastic. Every job comes with our 12-month guarantee. Caversham Heights is one of 34 towns and villages in Reading where we work.
Work in RG4 is quoted and booked the same way as anywhere else. If you need external mastic at a property on River Road, Chazey Road and Albert Road or anywhere close by, our applicators can take on the job. If you are just outside Caversham Heights, we cover Caversham (1 mile east), Tokers Green (1 mile north), Emmer Green (1 mile north-east), Lower Caversham (1 mile south-east) and Chalkhouse Green (1 mile north). Larger places within reach include Shinfield (5 miles south), Arborfield Garrison (8 miles south-east), Horncastle (3 miles south-west), Whitley Wood (4 miles south), Sonning Common (3 miles north) and Fords Farm (3 miles south-west). Caversham Heights is among the bigger towns we cover in Reading.
Local landmarks in Caversham Heights
Around Caversham Heights, our work takes us to homes and buildings near Hemdean House School, Round Copse and Highdown School and Sixth Form Centre. For rail, the closest station is Reading station, roughly 1.4 miles south-east. Nearby you will also find Battle Hospital (1.3 miles south) and Royal Berkshire Regiment Museum (1.4 miles south-west). Open spaces near Caversham Heights include Fobney Island Wetland Reserve and Sonning Hill.