Buckinghamshire · England
Ilmer External Mastic
Problem with your movement joints in Ilmer? We remove the old material, prepare the joints and seal them properly.
- Plants rooting in failed movement joints
- Movement joints filled with mortar instead of sealant
- Old sealant gone brittle and cracked
When it is not the sealant
To be straight with you, there are a few things sealant won’t fix:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Movement that’s more than a sealant joint can take
- Render that is blown, hollow or coming away
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we will tell you honestly.
Surfaces we seal
- Brickwork movement joints
- Joints between brick and frames
- Copings & trims
- Façade panels
- Render & cladding joints
- Concrete & block
How we handle external mastic in Ilmer
Many failed façade joints only get noticed once there’s a stain or a damp patch inside. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant. If you have rigid filler in a joint that should flex and moss and dirt in joints with no sealant left, we can help, whatever the surface.
External sealant needs dry, clean surfaces, so work around Ilmer is planned for dry weather. Tell us about access to all sides of the building, including outbuildings and garages.
Whatever the size of the job, it’s backed by our 12-month guarantee in Ilmer and across Buckinghamshire.
- Location
- Ilmer (HP27)
- Wider area
- Buckinghamshire
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Why deal with it now?
Mortar or ordinary filler might look like a quick way to close an open joint, but it locks the joint solid. The movement then cracks the brickwork or render nearby. A flexible sealant over backing rod is what the joint needs. Older cottages and farmhouses around Ilmer can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
What it costs depends on the amount of work, how hard the old material is to remove and access to the work. We give a clear quote before we start.
Why choose Mr Mastic in Ilmer
- An ARBOMaster approved applicator
- White, clear, grey or coloured to suit, where the product allows
- We’re fully insured
- A sealant colour to suit the surroundings
See our cost guide or our reviews.
What we do, step by step
The work is kept neat and contained to the area we’re working on. The job generally takes a few hours for a handful of joints, longer for a whole elevation, and we explain the cure time before we leave. For a village or hamlet like Ilmer, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- 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.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Getting ready for the visit
- Tell us about any previous sealing or DIY attempts
- Mention any sign-in or site rules at work premises
- Let us know if you’ve seen damp or leaks
How to get a quote
We quote each job on its own, so start by telling us what you need. Simply phone 0345 464 0079 or email us and describe the job.
Read more
What the job involves on each surface
Render joints
Rendered walls have joints at beads, openings and changes of material. They’re resealed in a sealant that suits the render.
Brickwork movement joints
Brick walls have vertical movement joints to absorb expansion. We reseal them with a low-modulus sealant over backing rod.
Towns and villages near Ilmer
What else we do in Ilmer
Ilmer: your questions answered
Can you help a landlord with a rental near Monks Risborough station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before any work starts.
Is Ilmer in your area for external mastic?
Yes. We work across London and the South East, and Ilmer is part of that. You can phone 0345 464 0079 or send us an email and let us know what needs doing, and we will give you a clear price.
How long does the job take?
That depends on how much there is to do, but as a guide it takes a few hours to a few days, depending on the length of joint and the access. We will give you a better idea when we quote.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned before resealing.
Are you insured?
Yes. Full insurance covers our work.
Why is there a gap in my brick wall?
Walls move with heat, cold and moisture, so long walls have planned gaps to take that movement. It’s closed with backing rod and a flexible sealant.
Will you leave a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
Will there be a smell?
Possibly a little. Any smell clears as the sealant cures.
Landlords, agents and businesses in Ilmer
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
When to call us in Ilmer
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.
If you can see any of these, it’s time to have the joints looked at:
- Rain getting behind render or cladding at a joint
- Weathered mastic that no longer stretches
- Plants rooting in failed movement joints
- Failed sealant between panels on a façade
Schools such as Longwick Church of England Combined School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s.
What to look for in a quote
- Which colour the sealant will be
- Are they insured?
- Whether the sealant suits the joint
- What happens if they find a problem under the old sealant
How we quote for external mastic
We quote each job individually. This is what makes a difference:
- Which sealant suits the joint
- Any working-time requirements on site
- The size of the job
- How easy the joints are to reach
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Asking for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- Where the property is
- Pictures of the joints, sent by email
- How many joints, rooms or windows are involved
- Access, such as stairs, a lift or height
Getting a quote is simple: tell us what needs doing and where, and roughly how big it is. A few pictures by email make the job easier to understand.
Outside joints around Ilmer
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Letting a property close to Monks Risborough station? Then split movement joints are easy to miss on a rental until damp shows inside. For an older house near a landmark such as Church of St Peter, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Ilmer is about 4 miles east of Thame, in Buckinghamshire. Homes, rented property, offices and hotels in Ilmer is covered for external mastic, old or new, large or small. The work is guaranteed for a year. Our Buckinghamshire coverage runs to 263 places, and Ilmer is one of them. You can also see our page for Oxford, roughly 15 miles from Ilmer.
Work in HP27 is quoted and booked the same way as anywhere else. Close by, we work in Longwick (1 mile south-east), Holly Green (1 mile south), Forty Green (1 mile south), Owlswick (1 mile east) and Pitch Green (2 miles south). Within a short drive, we also cover Aylesbury (6 miles north-east), High Wycombe (10 miles south-east), Chesham (12 miles east), Marlow (13 miles south), Amersham (13 miles east) and Beaconsfield (14 miles south-east).
Around Ilmer
The closest station to Ilmer is Monks Risborough station, about 2.5 miles east. Nearby you will also find Thame Community Hospital (3.6 miles west) and Great Kimble Dial Hill (3.4 miles east). Not far away are Beacon Hill and Snakemoor.