Buckinghamshire · England
External & façade joints in Fern, Buckinghamshire
External mastic in Fern from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Weeds or debris growing in open joints
- Cracked joints where brick meets render or frames
- Failed sealant between panels on a façade
For landlords and businesses
Hotels need rooms back in use, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
We also work for property managers and facilities teams in Fern and across Buckinghamshire. Several sites can be quoted together, and we’re fully insured for the work.
External mastic for homes and businesses in Fern
Low-level joints can normally be done from the ground. Where joints are higher up, tell us about the building when you get in touch and we will confirm what access is needed. We are often asked to deal with failed seals between different materials and plants rooting in failed movement joints, on façade panels, brickwork movement joints and render & cladding joints.
Around Fern, older buildings can be stone, brick or timber-framed, many with extensions added later. The joints where those materials meet are the weak points, and they need the right sealant at the right depth.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Where
- Fern (SL7)
- Wider area
- Buckinghamshire
- Guarantee
- One year on every job
- Price
- A clear price before we start
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
When something else is needed
In fairness, some problems need a different trade:
- Walls that need new movement joints cut into them
- Damp that isn’t coming from the joint
- Movement that’s more than a sealant joint can take
Not sure which it is? You can phone 0345 464 0079 or email us and we’ll tell you honestly before booking.
What we seal
- Render & cladding joints
- Copings & trims
- Façade panels
- Brickwork movement joints
- Concrete & block
- Joints between brick and frames
Your questions about external mastic in Fern
Can you do external mastic in Fern?
Yes, Fern is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or email us and tell us what needs doing.
Do you cover smaller places like Fern?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can you seal joints between render and window frames?
Yes. Joints between dissimilar materials are a big part of external work. We use a flexible sealant suited to both surfaces, primed where needed.
Can tenants book the work?
Yes, but check with your landlord or agent first. Many landlords are glad to have it sorted.
How long does external mastic last?
That depends on the wall, the weather and the movement. Look for splits, hardening or edges coming away.
Do I have to be there?
We need access to the joints, so we’ll agree that with you when we book. Indoors, that generally means someone at home.
What do you need from me for a quote?
Only a few details: the address or postcode, what’s wrong and any access issues. Then call 0345 464 0079 or email us.
Are you an approved applicator?
Yes. We are approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
Common problems we fix in Fern
Sometimes a movement joint was filled with mortar or a rigid filler, often by someone who didn’t know what it was for. The joint can’t move, so the wall cracks somewhere else instead.
If you can see any of these, it’s time to have the joints looked at:
- Leaking joints around cladding and façade panels
- Movement joints filled with mortar instead of sealant
- Damp patches traced to an open external joint
- Gaps where render, brick and frames meet
If you let a flat or house near Bourne End station, split movement joints are easy to miss on a rental until damp shows inside.
Questions to ask before booking
- What insurance they hold
- What happens if they find a problem under the old sealant
- How the colour is chosen
- What guarantee comes with the work
Why deal with it now?
Running new sealant over the old bead rarely lasts. New sealant does not bond well to old, weathered sealant, so the old joint is cut out fully first. In a small place like Fern, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Why book with us
- Colour agreed with you before work begins
- Homes, businesses and hotels
- 180+ five-star Google reviews
- Over 20 years’ experience
Take a look at our cost guide and customer reviews.
Surface by surface
Concrete and blockwork
Concrete faces can be dusty and porous, so preparation is key. We prime where the sealant needs it before the bead.
Cladding and façade panels
Cladding and façade panels are usually separated by sealed joints. We reseal them with a sealant suited to the panel material.
External mastic in Fern: local notes
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. Historic houses like Cliveden (about 2.7 miles south-east) are a reminder that the area around Fern has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
For an older house near a landmark such as Church of St John the Baptist, an extension built onto an older house moves differently, and the joint between them takes the strain. If you look after a building such as Little Marlow CofE School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Fern is about 2 miles north-east of Marlow, in Buckinghamshire. Fern gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Our Buckinghamshire coverage runs to 263 places, Fern among them. We also work in Reading, around 14 miles away.
All of SL7 is within our area for external mastic, from the main roads to the quietest streets. Neighbouring places we cover for external mastic include Coldmoorholme (1 mile south-east), Little Marlow (1 mile south-west), Well End (1 mile south-east), Bourne End (1 mile south-east) and Flackwell Heath (1 mile north-east). Further out, we also cover High Wycombe (3 miles north), Chesham (10 miles north-east), Amersham (8 miles north-east), Beaconsfield (4 miles east), Chalfont St Peter (8 miles east) and Southcourt (15 miles north).
Local landmarks in Fern
Typical jobs here are in homes near Bourne End Academy and The Black Lion pub, among other places. Fern’s nearest station is Bourne End station, roughly 1.1 miles south-east of the centre. Well-known places in the area include High Wycombe Castle (3.1 miles north) and Chiltern Sound Phonograph Museum (2.3 miles south-west). The countryside around Fern includes Warren Nature Reserve.
How the visit works
Good joint work is mostly preparation, and we do not rush it. Joints are cleaned back and dried before anything new goes in. All told, the work takes a few hours to a few days, depending on the length of joint and the access. Somewhere as small as Fern, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by walking round the building and agreeing the joints and the access.
- 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.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- Mention any sign-in or site rules at work premises
- Tell us about any previous sealing or DIY attempts
- Keep children and pets away from the work area
Getting a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we will explain what’s involved before giving you a price.
Advice
More services for Fern
Looking after it afterwards
Aftercare is simple, and it makes a real difference:
- Act on the first splits you see
- Check external joints each spring
- Tell anyone working on the walls about the movement joints
- Keep high-pressure jets off the joints
Don’t let soil, plants or ivy build up against the new joints. Damp material against the sealant shortens its life.
A joint that has stopped moving pushes the movement elsewhere, usually as cracking in the brickwork or render nearby. Resealing it early helps prevent that.