West Berkshire · England
External Mastic in Lambourn
External mastic in Lambourn from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Leaking joints around cladding and façade panels
- Hard, crazed mastic that has stopped moving
- Plants rooting in failed movement joints
External mastic for homes and businesses in Lambourn
Joints in render and cladding are easy to overlook until a damp patch appears. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant in a matching colour. Common call-outs are for weathered mastic that no longer stretches and panel joints letting water in, across brickwork movement joints, concrete & block and joints between brick and frames.
Around Lambourn, garages, outbuildings and extensions all add to the joints on the outside of a home. Leaks normally start at a gutter end, a garage door frame or where an extension meets the house.
Big or small, you get the same 12-month guarantee in Lambourn and across West Berkshire.
- Where
- Lambourn (RG17)
- Wider area
- West Berkshire
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Lambourn: your questions answered
Do you cover Lambourn for external mastic?
Yes, Lambourn is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job.
Is Lambourn within the area you cover?
Yes, Lambourn 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.
What is backing rod for?
We fit closed-cell backing rod wherever the joint depth needs controlling. It controls the depth and stops the sealant bonding to the back, so the joint can move.
How do I get a quote for external mastic in Lambourn?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
How do you reach high-level joints?
It depends on the height and the site. Ground-floor joints are simple; for higher ones, send details and we will confirm the access.
Will there be a smell?
There can be a smell while the sealant cures, but it fades. Opening a window helps.
Where do you work from?
We are based in Crawley, and we cover South East England, London and all of Scotland.
What is a movement joint?
A vertical gap in a long brick wall is generally a movement joint. It lets the bricks expand without cracking, and it should be sealed with a flexible sealant.
Towns and villages near Lambourn
Other services in Lambourn
Surface by surface
Concrete and blockwork
The face of concrete or block is often dusty, so cleaning and priming matter. A primer goes on where the product requires one.
Cladding and façade panels
Cladding and façade panels are generally separated by sealed joints. We reseal them with a sealant suited to the panel material.
What affects the quote in Lambourn
Your quote is based on your job. We take into account:
- Any working-time requirements on site
- Access and height
- Any mould that needs treating
- The old material and how stubborn it is
Doing several joints on one visit is normally more efficient than separate visits, so tell us about everything that needs sealing. We will send you a clear quote for the lot.
What we need to know
Before you ask for a quote, have a think about:
- If someone has resealed it before
- A few pictures by email, if you can
- The address or postcode of the job
- How many joints, rooms or windows are involved
We don’t publish a price list. Instead, we send you a clear quote for your job. To arrange one, ring 0345 464 0079 or send us an email.
How it works
At the end, we look at the finished work together. The visit itself generally takes a few hours to a few days, depending on the length of joint and the access, depending on the size of the job. In a smaller place like Lambourn, parking is seldom the issue; lanes, gates and long drives are worth mentioning. If the job is outside, tell us about side access and how high the joints are.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Before we arrive
- Let us know if you’ve seen damp or leaks
- For business premises, tell us about site rules or sign-in
- Keep pets and children clear of the area while we work
How to get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. When it suits you, phone 0345 464 0079 or email us.
Related advice
DIY versus a professional finish
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
Outside joints around Lambourn
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Ashdown House (about 3.5 miles north-west) nearby, there’s older building stock in the area around Lambourn as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
Managing a site like Lambourn CofE Primary School? Then larger buildings have long runs of movement joint that eventually need resealing.
Lambourn is about 7 miles south-west of Wantage, in West Berkshire. From the centre of Lambourn to the outskirts, we cover external mastic for every kind of property, from flats and houses to offices and hotels. Our West Berkshire coverage runs to 155 places, and Lambourn is one of them. For nearby work, see our Oxford page.
Every address in RG17 is covered for external mastic, from the main roads to the quietest streets. External mastic is available to properties on High Street, Station Road and Chapel Lane and the roads around them. If you’re just outside Lambourn, we cover Sheepdrove (1 mile north-east), Upper Lambourn (1 mile north-west), Westcot (6 miles north), Sparsholt (6 miles north) and Kingston Lisle (6 miles north). Further out, we also cover Newbury (12 miles south-east), Thatcham (14 miles south-east), Speenhamland (11 miles south-east), Hungerford (7 miles south), Shaw (12 miles south-east) and Wash Common (12 miles south-east). Lambourn is one of the larger places we cover in West Berkshire.
Near you in Lambourn
Locally, jobs take us to homes and businesses close to The George pub, among other places. Open spaces near Lambourn include Watts Bank and Rams Hill.
When to call us in Lambourn
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, and it tears off the sides.
It’s worth asking for a quote if you see:
- Leaking joints around cladding and façade panels
- Joints pointed up with cement by mistake
- Joints with sealant missing in places
- Joints where the bead has come unstuck
Homes close to Church of St Michael and All Angels include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant.
Before booking anyone
- What insurance they hold
- What happens if they find a problem under the old sealant
- How the surfaces are prepared before sealing
- How long the guarantee is
What we can’t put right
Before you book, it’s worth knowing the limits:
- Adding movement joints to masonry that has none
- Subsidence or other structural problems
- Failed render or damaged cladding panels
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly.
Joints and surfaces we work on
- Concrete & block
- Joints between brick and frames
- Render & cladding joints
- Façade panels
- Brickwork movement joints
- Copings & trims
Aftercare tips
No joint lasts for ever, but care makes a real difference. Our tips:
- Keep water from gutters off the wall
- Clear growth from the base of walls and joints
- Look over the joints every year, ideally after winter
- Check the sealant is paintable before painting near it
Don’t paint over the new sealant unless we’ve said the product is paintable. Many exterior sealants aren’t designed to be painted.
Act while the splits are small. At that stage it’s a simple cut out and reseal before water has had years to get in.