Buckinghamshire · England
External & façade joints in Mundaydean Bottom, Buckinghamshire
Our applicators work in Mundaydean Bottom on sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly.
- Leaking joints around cladding and façade panels
- Hard, crazed mastic that has stopped moving
- Joints with sealant missing in places
Signs you need external mastic in Mundaydean Bottom
Every building moves. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. The sealant in the movement joints takes that strain.
The problems people usually mention when they call are:
- Cracked joints where brick meets render or frames
- Damp patches traced to an open external joint
- Rigid filler in a joint that should flex
- Joints where the bead has come unstuck
If you look after a building such as Burford School, its movement joints, gutters and trims need looking after like any other building’s.
What to look for in a quote
- What insurance they hold
- Is VAT in the price?
- What happens if they find a problem under the old sealant
- What product goes in the joint
About our external mastic in Mundaydean Bottom
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 mortar or filler would crack. We work on concrete & block, joints between brick and frames and copings & trims, and people most often call us about hard, crazed mastic that has stopped moving and brick movement joints where the sealant has split.
In a village or hamlet like Mundaydean Bottom, older cottages and farm buildings often stand in the open, where walls and rooflines take the weather head on. Joints on those walls need a sealant that moves with the building and stays in place.
All of our work is guaranteed for twelve months, in Mundaydean Bottom and everywhere else we cover.
- Place
- Mundaydean Bottom (SL7)
- Region
- Buckinghamshire
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Work for landlords, hotels and businesses
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. We can quote for more than one property at once.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
Should I try it myself first?
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it lifts and traps water and mould underneath. All the old material has to come out 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 fails, we can still redo it.
Why act early in Mundaydean Bottom
Sealing over the top of old mastic doesn’t hold for long. The new layer can’t bond properly to old, weathered material, so we always take the old sealant out. Older cottages and farmhouses around Mundaydean Bottom can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we will explain the quote if you ask.
Why choose Mr Mastic in Mundaydean Bottom
- 4.9 on Google from 180+ five-star reviews
- Any old sealant cut out fully, not covered over
- Anti-fungal sanitary silicone in wet areas
- More than 20 years in sealant work
Take a look at our cost guide or our reviews.
Honest limits
Some problems need a builder, plumber or other trade rather than us:
- Cracked brickwork or render that needs a builder or plasterer
- Structural movement, which needs a surveyor or engineer
- Adding movement joints to masonry that has none
If you are not sure, just call 0345 464 0079 or drop us an email and we will give you a straight answer before you book.
Surfaces we seal
- Façade panels
- Render & cladding joints
- Concrete & block
- Copings & trims
- Joints between brick and frames
- Brickwork movement joints
Looking after it afterwards
How long the joints last depends on use and care. We suggest:
- Act on the first splits you see
- Never let anyone fill a movement joint with mortar
- Keep water from gutters off the wall
- Point out the joints to other trades
Do not let soil, plants or ivy build up against the new joints. Damp material against the sealant shortens its life.
Once a joint can’t move, the wall finds another way, often as cracks near the joint. Resealing it early helps prevent that.
What we do, step by step
At the end, we look at the finished work together and tell you how long to leave it. The visit itself usually takes a few hours for a handful of joints, longer for a whole elevation, depending on the size of the job. Somewhere like Mundaydean Bottom needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- First, the joints are inspected and the access agreed.
- 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.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
How to prepare
- Mention any sign-in or site rules at work premises
- Mention any parking rules near the property
- Mention if the joints have been sealed before
Getting a quote
Need a quote? Please call 0345 464 0079 or send us an email with a few details. We’ll explain what we’d do and give you a clear price before we start.
Related advice
Common questions in Mundaydean Bottom
Is Mundaydean Bottom in your area for external mastic?
Yes. We work across London and the South East, and Mundaydean Bottom is part of that. You can call 0345 464 0079 or email us and tell us what needs doing.
Can you help a landlord with a rental near Marlow station?
Yes. We work for landlords and agents as well as householders. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we will give you a clear price.
Why do you put foam in the joint first?
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.
What does external mastic cost?
We don’t publish prices, because the cost depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
What colours does the sealant come in?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We pick the one that suits your wall best so it doesn’t stand out.
How long does external mastic take?
As a guide, most jobs take a few hours for a handful of joints, longer for a whole elevation. Larger jobs naturally take longer.
What is a movement joint?
Brickwork, render and cladding all move a little, and planned joints take up that movement. The gap is sealed with a flexible sealant over backing rod.
Will the old sealant be removed?
Yes. We cut out all the old sealant and clean the joint.
Nearby places to Mundaydean Bottom
Other services in Mundaydean Bottom
Outside joints around Mundaydean Bottom
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Harleyford Manor (about 2.3 miles south) are a reminder that the area around Mundaydean Bottom has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
Rented homes near Marlow station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets. For an older house near a landmark such as St Mary the Virgin, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Mundaydean Bottom is about 2 miles north-west of Marlow, in Buckinghamshire. Mundaydean Bottom gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. We cover 263 towns and villages across Buckinghamshire, large and small. We also work in Reading, around 12 miles away.
Our applicators cover all of SL7 for external mastic and the streets around it. We also cover the places around Mundaydean Bottom: Bovingdon Green (1 mile south), Marlow Common (1 mile south), Chisbridge Cross (1 mile north-west), Bockmer End (2 miles south-west) and Danesfield (2 miles south). We also work in nearby towns such as High Wycombe (4 miles north-east), Chesham (12 miles north-east), Amersham (11 miles north-east), Beaconsfield (7 miles east), Chalfont St Peter (11 miles east) and Southcourt (15 miles north).
What’s near Mundaydean Bottom
Typical jobs here are in homes near The Royal Oak pub and Sir William Borlase's Grammar School, among other places. For rail, the closest station is Marlow station, about 1.9 miles south-east of the centre. Well-known places in the area include Chiltern Sound Phonograph Museum (1.5 miles south-east) and Marlow Community Hospital (1.7 miles south-east). Green spaces nearby include Carpenter's Wood.