West Berkshire · England
External Mastic in Catmore
External mastic across Catmore and nearby, with old sealant always removed completely and a 12-month guarantee.
- Moss and dirt in joints with no sealant left
- Failed sealant between panels on a façade
- Sealant pulling away from one side of the joint
Do you need external mastic in Catmore?
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, so it pulls away from the edges.
Most people get in touch when they notice one of these:
- Water getting into walls through failed joints
- Movement joints with cracked, split or missing sealant
- Failed seals between different materials
- Joints pointed up with cement by mistake
Homes close to Church of St Margaret include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
What to look for in a quote
- How the joint is cleaned and prepared
- Is the old sealant removed completely?
- What the cure time is
- Whether VAT is included
How we handle external mastic in Catmore
Ground-floor and low-level joints are straightforward to reach. For joints higher up, give us some details of the building and we’ll confirm what’s needed to reach them safely. We’re often asked to deal with moss and dirt in joints with no sealant left and movement joints filled with mortar instead of sealant, on façade panels, brickwork movement joints and concrete & block.
External sealant needs dry, clean surfaces, so work around Catmore is planned for dry weather. Tell us about access to all sides of the building, including outbuildings and garages.
The work is covered for a year after we finish. If anything is not right with it, call 0345 464 0079 or drop us an email.
- Where
- Catmore (RG20)
- Wider area
- West Berkshire
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Quotes for external mastic in Catmore
We do not publish a price list, because no two jobs are the same. What we look at:
- The type of sealant required
- Any working-time requirements on site
- The size of the job
- Any mould that needs treating
There are no prices on our website, because each job is priced on what it involves. Call for a quick quote.
Asking for a quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- Where the property is
- If it’s domestic, commercial or a hotel
- The rough size of the job
- Photos by email, if that is easy
For external mastic in Catmore, ring 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and you will get a clear quote before we start.
DIY versus a professional finish
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 does not work out, we can still put it right.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
The process
There’s no need to move everything out, only the area right around the joints. We protect the rest, and the job takes a few hours to a few days, depending on the length of joint and the access for a typical job. Somewhere as small as Catmore, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- 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.
- We apply the sealant, tool it and check the whole run.
Getting ready for the visit
- Keep pets and children clear of the area while we work
- Let us know about stairs, lifts or work at height
- Tell us if parking is tricky
Ask for a quote
Every job is quoted individually. Simply ring 0345 464 0079 or drop us an email and describe the job.
Read more
Why it’s worth doing now in Catmore
Mortar or ordinary filler might look like a quick way to close an open joint, but it stops the joint moving. The movement then cracks the brickwork or render nearby. A flexible sealant over backing rod is what the joint needs. Where a wall is exposed, as many are in small places like Catmore, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part.
Why choose Mr Mastic in Catmore
- Quality sealants from Arbo and Everbuild
- Any old sealant cut out fully, not covered over
- Anti-fungal sanitary silicone in wet areas
- A choice of colours where the product allows
Take a look at our cost guide and customer reviews.
Your questions about external mastic in Catmore
Can you do external mastic in Catmore?
Yes. Our work covers London and the South East, and Catmore is part of that. You can call 0345 464 0079 or email us and tell us what needs doing, and we will send you a clear quote.
Will you come out to Catmore?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Should I try DIY first?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
Is the work guaranteed?
Yes. Every job comes with a one-year guarantee.
Are you an approved applicator?
Yes. Mr Mastic is an ARBOMaster approved applicator, and we’re fully insured.
How much does external mastic cost in Catmore?
Size, access and the old material all affect the cost. Ask us for a quote and we’ll talk you through it.
What colours does the sealant come in?
The aim is a neat, even joint in a colour that suits the wall. Colour is agreed with you before we begin, matched as closely as the range allows.
Can new sealant go over the old?
No. The old sealant always comes out first.
Aftercare tips
How long the joints last depends on use and care. Here’s what we suggest:
- Keep high-pressure jets off the joints
- Look over the joints every year, ideally after winter
- Keep soil, plants and ivy away from the joints
- Point out the joints to other trades
Only paint over the joint if we’ve confirmed the sealant can take paint. Paint can crack on a flexible joint, and paint can crack as the joint moves.
Leaks behind façade panels and render often go unseen. When it finally shows inside, the joint may have been open for years.
Nearby places to Catmore
Also in Catmore
Different surfaces, different methods
Copings and trims
A failed coping joint lets water into the top of the wall. Sealing them early saves the wall below.
Joints between dissimilar materials
Different materials may need different primers. Both surfaces are cleaned and primed as the product requires.
Outside joints around Catmore
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
In and around Catmore, as anywhere, good external mastic starts with a clean, dry, properly prepared joint.
Catmore is about 6 miles south-east of Wantage, in West Berkshire. Catmore gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. We cover 155 towns and villages across West Berkshire, large and small. There’s also a page for Reading, roughly 17 miles from Catmore.
Jobs for external mastic in RG20 works the same way as everywhere else we cover. If you’re just outside Catmore, we cover Farnborough (2 miles north-west), Brightwalton (2 miles west), Stanmore (2 miles south-east), Brightwalton Green (2 miles south-west) and West Ilsley (2 miles north-east). Further out, we also cover Newbury (8 miles south), Thatcham (9 miles south-east), Burghfield Common (15 miles south-east), Speenhamland (8 miles south), Hungerford (10 miles south-west) and Calcot (14 miles south-east).