Buckinghamshire · England
External Mastic in Saunderton Lee
Specialist external mastic for Saunderton Lee: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Sealant pulling away from one side of the joint
- Gaps where render, brick and frames meet
- Hard, crazed mastic that has stopped moving
Different surfaces, different methods
Concrete and blockwork
Concrete faces can be dusty and porous, so preparation is key. A primer goes on where the product requires one before sealing.
Cladding and façade panels
If the façade has a specified sealant, that is what we use or an approved alternative. Send us any details you have about the façade.
External mastic in Saunderton Lee, 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 failed sealant between panels on a façade and joints where the bead has come unstuck, we can put it right, whatever the surface.
Older homes in small places like Saunderton Lee may be stone, brick or timber-framed, often with later extensions. The joints where those materials meet are the weak points, and they need the right sealant at the right depth.
You’re covered for a year from the day we finish. If there’s a problem with it, please call 0345 464 0079 or drop us an email.
- Location
- Saunderton Lee (HP27)
- Region
- Buckinghamshire
- Cover
- One year on every job
- Quotes
- A clear price before we start
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What we do, step by step
Before we leave, we go over the finished joints with you and explain the cure time. The work normally takes a few hours to a few days, depending on the length of joint and the access, depending on the size of the job. Somewhere as small as Saunderton Lee, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- Mention any tricky access
- Mention any leaks or damp you’ve noticed
- Keep pets and children clear of the area while we work
Getting a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Related advice
Also near Saunderton Lee
Also in Saunderton Lee
Aftercare tips
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Show decorators and builders where the movement joints are
- Wash walls gently around the sealant
- Keep movement joints as flexible joints, not mortar
- Check the sealant is paintable before painting near it
Don’t paint over the new sealant unless we have said the product is paintable. Paint can crack on a flexible joint and spoil the finish.
Act while the splits are small. At that stage it’s a simple cut out and reseal with no damage behind it to deal with.
Landlord and commercial work in Saunderton Lee
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will quote.
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. Several properties can be quoted together.
Questions from Saunderton Lee
Can you help a landlord with a rental near Saunderton station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we’ll give you a clear quote.
Is Saunderton Lee within the area you cover?
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.
Are you insured?
Yes. Full insurance covers our work.
What colours does the sealant come in?
Exterior sealants are made in a range of colours, from greys and browns to whites and stone shades. We choose the closest to your brick or render so it doesn’t stand out.
When is the sealant fully cured?
It depends on the product and the temperature. We tell you how long to leave it before we go.
Can you seal joints between render and window frames?
Yes. We cut out the old sealant, prepare both faces and reseal with a flexible exterior product. We pick a colour that works with both materials.
Where are you based?
Our base is in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
Is it OK to fill a movement joint with cement?
No. Mortar locks the joint solid, so the wall cracks somewhere else instead. Use a flexible sealant with backing rod.
What external mastic looks like in Saunderton Lee
With historic houses such as West Wycombe Park House (about 3.6 miles south) nearby, there’s older building stock in the area around Saunderton Lee as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For an older house near a landmark such as Church of St John the Evangelist, old and new materials meet at the roofline and walls, which is where sealant earns its keep. Letting a property close to Saunderton station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
Saunderton Lee is about 5 miles north-west of High Wycombe, in Buckinghamshire. Anywhere in HP27, our applicators can take on external mastic. Our Buckinghamshire coverage runs to 263 places, Saunderton Lee among them. We also work in Reading, around 18 miles away.
Every address in HP27 is covered for external mastic. If you need external mastic at a property on Wycombe Road, Little Lane and Lee Road or anywhere close by, our applicators can take on the job. If you are just outside Saunderton Lee, we cover Loosley Row (1 mile north-east), Lacey Green (1 mile north-east), Saunderton (1 mile south), Rout's Green (1 mile south-west) and Bledlow Ridge (1 mile south-west). Further out, we also cover Aylesbury (9 miles north), High Wycombe (5 miles south-east), Chesham (10 miles east), Marlow (8 miles south), Amersham (10 miles east) and Beaconsfield (10 miles south-east).
What’s near Saunderton Lee
Locally, jobs take us to homes and businesses close to Princes Risborough School and The Whip Inn and the streets around them. Saunderton Lee’s nearest station is Saunderton station, roughly 1 mile south of the centre. Well-known places in the area include Great Kimble Dial Hill (4.1 miles north) and Wycombe Hospital (5.5 miles south-east). Green spaces nearby include Beacon Hill and Yoesden.
Can I do it myself?
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions.
What affects the quote in Saunderton Lee
Jobs vary more than people expect. What affects the quote:
- Whether the work is at height
- Any mould that needs treating
- Working hours on commercial sites
- The amount of work
The cost depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before work begins.
What we need to know
There’s no need for technical detail. It helps if you can tell us:
- What the problem is, such as mould, gaps, leaks or cracking
- The rough size of the job
- The address or postcode of the job
- If someone has resealed it before
Need a quote? Please call 0345 464 0079 or drop us an email and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
When to call us in Saunderton Lee
A lot of failed joints come down to preparation: dusty or wet faces, no primer where one was needed, or old sealant left in. The sealant never bonds properly.
Keep an eye out for these signs:
- Damp patches traced to an open external joint
- Gaps where render, brick and frames meet
- Joints with sealant missing in places
- Failed sealant between panels on a façade
For site and facilities teams at buildings such as St John's Church of England Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
What your quote should include
- How long the guarantee is
- What happens if the job turns out different
- Are they insured?
- Whether the sealant suits the joint