West Berkshire · England
External Mastic in Penwood
Movement joints in Penwood need attention? We remove the old material, prepare the joints and seal them properly.
- Brick movement joints where the sealant has split
- Sealant that has lost its bond to the brick or render
- Gaps where render, brick and frames meet
How we handle external mastic in Penwood
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible sealant bridges the two where a rigid filler would soon crack. Typical jobs include panel joints letting water in and old sealant gone brittle and cracked, on concrete & block, brickwork movement joints and copings & trims.
Outside joints can only be sealed when they’re dry, so work in Penwood is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Location
- Penwood (RG20)
- Wider area
- West Berkshire
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Honest limits
Sealant isn’t the answer to every problem, and we’d rather say so up front. Sealant won’t put right:
- Adding movement joints to masonry that has none
- Rising or penetrating damp from elsewhere in the wall
- Cracks in the bricks or render themselves, away from the joints
Not sure which it is? You can call 0345 464 0079 or send us an email and we’ll tell you honestly.
What we seal
- Joints between brick and frames
- Copings & trims
- Concrete & block
- Render & cladding joints
- Façade panels
- Brickwork movement joints
Penwood: your questions answered
Do you work for landlords with property near Newbury station?
Yes, we work for letting agents and landlords. Just call 0345 464 0079 or drop us an email and tell us about the property, and we will give you a clear price.
Will you come out to Penwood?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
How long does external mastic last?
That varies with the weather the wall faces, how much it moves and the sealant used. Treat it as a maintenance item and look at it yearly and reseal when it splits.
Can new sealant go over the old?
No, it will not last. It can look neat for a few weeks, but the new bead soon lifts. The old sealant has to come out completely.
What is backing rod for?
Backing rod goes into deeper joints as a matter of course. It controls the depth and stops the sealant bonding to the back.
Will the new joint stand out?
Exterior sealants are made in a range of colours, from greys and browns to whites and stone shades. We pick the one that suits your wall best so it doesn’t stand out.
Is it messy?
We keep the work tidy. Nearby surfaces are protected, and the area is left clean when we finish.
Do you have insurance?
Yes. We’re fully insured.
DIY versus a professional finish
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
Towns and villages near Penwood
More services for Penwood
What we do, step by step
You do not need to clear the whole room or building before we come, just the space around the work. We protect the rest, and the job takes a few hours to a few days, depending on the length of joint and the access in most cases. For a village or hamlet like Penwood, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- First we look over the joints with you, agree which to renew and talk through access.
- Old sealant and any debris are cut and raked out.
- Both sides are cleaned back to sound material and primed if needed.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Before we arrive
- Mention any tricky access
- Mention any parking rules near the property
- For business premises, tell us about site rules or sign-in
Get a quote
Asking for a quote is easy: tell us what needs doing and where and its rough size. Photos by email help us understand the job, and we’ll come back to you with a quote.
Advice
What external mastic looks like in Penwood
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 Highclere Castle (about 1.7 miles south) nearby, there’s older building stock in the area around Penwood as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
If you look after a building such as Woolton Hill Junior School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. Homes close to Church of St Michael Archangel include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move.
Penwood is about 4 miles south-west of Newbury, in West Berkshire. We provide external mastic to homes and businesses in Penwood and nearby, as part of our work across West Berkshire. Penwood is one of 155 places in West Berkshire we cover for external mastic. There’s also a page for Reading, about 18 miles away.
Every address in RG20 is covered for external mastic, from the main roads to the quietest streets. External mastic is available to properties on Penwood Heights, Woodlands and Foxs Lane and the roads around them. If you are just outside Penwood, we cover Woolton Hill (1 mile north-west), Highclere (1 mile south-west), Wash Water (1 mile north-east), Enborne Row (1 mile north) and Burghclere (2 miles east). Within a short drive, we also cover Newbury (4 miles north-east), Thatcham (6 miles north-east), Burghfield Common (13 miles east), Speenhamland (4 miles north-east), Hungerford (8 miles north-west) and Calcot (15 miles north-east).
What’s near Penwood
Locally, jobs take us to homes and businesses close to The Clere School, among other places. The nearest railway station is Newbury station, about 3.7 miles north-east. Nearby you’ll also find Newbury Castle (3.5 miles north) and British Balloon Museum & Library Ltd (3.9 miles north-east). The countryside around Penwood includes Audrey's Meadow and Sidown Hill.
Do you need external mastic in Penwood?
UV, rain and frost all age exterior sealant. Over the years it hardens, cracks on the surface and loses its give, so the next time the wall moves, it splits or pulls away.
Keep an eye out for these signs:
- Damp patches traced to an open external joint
- Old sealant gone brittle and cracked
- Failed sealant between panels on a façade
- Movement joints filled with mortar instead of sealant
If you let a flat or house near Newbury station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
What to look for in a quote
- What preparation is included
- Are they insured?
- Which sealant they’ll use, and why
- When the joint can take water or movement
How we quote for external mastic
Every job gets its own quote. This is what makes a difference:
- The size of the job
- Any mould that needs treating
- Working hours on commercial sites
- Whether old sealant or filler has to be cut out
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
What we need to know
There’s no need for technical detail. Just tell us:
- Pictures of the joints, sent by email
- The type of property
- Any access issues, like height or stairs
- Where the job is, and your postcode
For a quick quote, get us on the phone, or email us if that is easier. Tell us about the joints that need doing and we’ll talk you through the work before giving you a price.
What happens if it’s left?
A properly done movement joint is an even line in a colour that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner, so it pays to do it properly once. In a small place like Penwood, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all make a difference, and we’ll explain the quote if you ask.
Why choose Mr Mastic in Penwood
- Colour agreed with you before any work starts
- Every job guaranteed for a year
- We leave the area clean and tidy
- Full insurance on every job
See what affects the cost and our reviews.
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Clear growth from the base of walls and joints
- Deal with leaking gutters that soak the joints below
- Keep movement joints as flexible joints, not mortar
- Check external joints each spring
Make sure anyone working on the wall later knows where the movement joints are. They must stay as flexible joints, never rendered or pointed over.
An open movement joint lets rain into the wall every time it pours. That can lead to damp patches, staining and frost damage.