Buckinghamshire · England
External & façade joints in Long Crendon, Buckinghamshire
External mastic for Long Crendon and the surrounding area: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Sealant pulling away from one side of the joint
- Joints pointed up with cement by mistake
- Moss and dirt in joints with no sealant left
Can I do it myself?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
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.
External mastic in Long Crendon, done properly
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible exterior sealant takes up that movement where mortar or filler would crack. If you have rigid filler in a joint that should flex and moss and dirt in joints with no sealant left, we can put it right, whatever the surface.
Houses in smaller places like Long Crendon can stand more in the open than those in a built-up town, so exposed walls and rooflines take more wind-driven rain. Joints on those sides are generally the first to go.
Our work is backed for twelve months.
- Where
- Long Crendon (HP18)
- Wider area
- Buckinghamshire
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What sealant work cannot fix
New sealant cannot fix everything, and we will tell you before we start. Sealant won’t put right:
- Loose or hollow render, which needs re-rendering
- Damp that isn’t coming from the joint
- Cracked brickwork or render that needs a builder or plasterer
If in doubt, phone 0345 464 0079 or email us and we will say what we think.
Where we work in Long Crendon
- Copings & trims
- Concrete & block
- Façade panels
- Joints between brick and frames
- Render & cladding joints
- Brickwork movement joints
More services for Long Crendon
Aftercare tips
So the new joints stay in good condition:
- Wash walls gently around the sealant
- Act on the first splits you see
- Fix overflowing gutters above sealed joints
- Keep movement joints as flexible joints, not mortar
Keep pressure washers away from the sealant. High-pressure water can lift the edges over time.
Leave a failed movement joint and water keeps getting into the wall. That can lead to damp patches, staining and frost damage which cost more to put right than the joint.
Quotes for external mastic in Long Crendon
Call for a quick quote. The main things that affect it are:
- Working hours on commercial sites
- The type of sealant required
- The size of the job
- Whether the work is at height
We don’t show prices on the website, because each job is priced on what it involves. Call for a quick quote and we’ll talk you through it.
Helping us quote
Before you ask for a quote, have a think about:
- A few pictures by email, if you can
- The address or postcode of the job
- If it’s domestic, commercial or a hotel
- Any previous sealing or DIY work
For a quote, call 0345 464 0079 or drop us an email with the location and a short description of the problem. We’ll give you a clear quote before any work starts.
Work for landlords, hotels and businesses
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
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.
Common problems we fix in Long Crendon
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.
The most common problems we see are:
- Moss and dirt in joints with no sealant left
- Gaps where render, brick and frames meet
- Old sealant gone brittle and cracked
- Failed sealant between panels on a façade
For an older house near a landmark such as Church of St Mary, older walls, gutters and the joints where extensions meet them need a flexible sealant.
What your quote should include
- How long the guarantee is
- Whether you can choose the colour
- Who does the work, and how experienced they are
- How the joint is cleaned and prepared
Walls and rooflines in Long Crendon
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For site and facilities teams at buildings such as Long Crendon School, larger buildings have long runs of movement joint that eventually need resealing. For landlords with property near Haddenham & Thame Parkway station, outside joints that have cracked can let damp into a rental, so check them between lets.
Long Crendon is about 2 miles north-west of Thame, in Buckinghamshire. Homes, rented property, offices and hotels in Long Crendon can book us for external mastic. Every job comes with our one-year guarantee. Our Buckinghamshire coverage runs to 263 places, Long Crendon among them. We also work in Oxford, about 10 miles from Long Crendon.
Jobs for external mastic in HP18 is quoted and booked the same way as anywhere else. That includes homes and businesses on High Street, The Square and Giffard Way. Neighbouring places we cover for external mastic include Chearsley (2 miles north-east), Thame (2 miles south-east), Moreton (3 miles south), Haddenham (3 miles east) and Cuddington (3 miles north-east). We also work in nearby towns such as Aylesbury (8 miles east), High Wycombe (15 miles south-east), Buckingham (15 miles north), Elmhurst (9 miles north-east), Southcourt (8 miles east) and Princes Risborough (8 miles south-east).
Around Long Crendon
We work in homes and buildings around Lord Williams's School and The Eight Bells Public House and the streets around them. Long Crendon’s nearest station is Haddenham & Thame Parkway station, about 2.3 miles east. Nearby you will also find Dinton Castle (4.7 miles east) and Thame Community Hospital (2.4 miles south-east). For a walk, there’s Snakemoor.
FAQs for Long Crendon
Can you do external mastic in Long Crendon?
Yes. We work across London and the South East, and Long Crendon is part of that. You can ring 0345 464 0079 or email us and let us know what needs doing.
Can you help a landlord with a rental near Haddenham & Thame Parkway station?
Yes, we work for letting agents and landlords. Just phone 0345 464 0079 or drop us an email and tell us about the property, and we’ll give you a clear quote.
Can a movement joint be filled with mortar?
No. Mortar locks the joint solid, so the movement cracks the wall elsewhere. Use a flexible sealant with backing rod.
How long should I leave it?
It depends on the product and the temperature. Before we leave, we will tell you the cure time.
Can you match the colour of my brickwork?
We choose a sealant colour to suit the brick, stone or render so the joint blends in. There’s a wide choice of exterior colours.
Do you work at height?
That depends on the building and the joints. We work on joints that can be reached safely. Give us some details and we will confirm the access.
Can I add another job to the visit?
Yes. Just list everything you need.
Do you remove the old sealant?
Yes, always, and completely. New sealant will not bond properly to old, so any old material comes out before anything new goes in.
The process
All our tools and materials come with us in the van, so you do not need to buy or prepare anything. After a quick look at the joints together, the area is protected and the work begins. Most jobs take a few hours for a handful of joints, longer for a whole elevation. Parking around Long Crendon is usually easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
How to prepare
- Mention any parking rules near the property
- For business premises, tell us about site rules or sign-in
- Mention any leaks or damp you’ve noticed
How to get a quote
Every job is quoted individually, so the first step is telling us about yours. Simply phone 0345 464 0079 or email us and describe the job and send pictures if you have them.