Oxfordshire · England
External Mastic in Crowell
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Crowell and across Oxfordshire. Fully insured, ARBOMaster approved and guaranteed for a year.
- Panel joints letting water in
- Rain getting behind render or cladding at a joint
- Sealant pulling away from one side of the joint
How we handle external mastic in Crowell
For buildings in Crowell, we reseal external joints of all kinds, from brick movement joints to cladding panels. Every joint gets the same careful preparation: clean, sound faces and a controlled depth. If you’re dealing with brick movement joints where the sealant has split and weathered mastic that no longer stretches, we can put it right, on copings & trims, brickwork movement joints and joints between brick and frames alike.
Somewhere as small as Crowell, homes and farm buildings often face open ground, 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 our work is covered by our one-year guarantee, wherever you are in Oxfordshire.
- Place
- Crowell (OX39)
- Wider area
- Oxfordshire
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Looking after it afterwards
Aftercare is simple:
- Check the sealant is paintable before painting near it
- Look over the joints every year, ideally after winter
- Keep high-pressure jets off the joints
- Don’t let climbing plants root in the sealant
Follow the cure time we give you before the joint is knocked or disturbed. The surface skins over quickly, but full cure takes longer.
Once a joint can’t move, the wall finds another way, usually as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
Landlord and commercial work in Crowell
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we’ll quote.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Why act early in Crowell
Resealing a run of joints in one go is generally better than patching one at a time. Joints of the same age tend to fail together, and access only has to be arranged once. Where a wall is exposed, as many are in small places like Crowell, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
What it costs depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. You will have a clear quote before any work starts, so you know where you stand.
Why us?
- We never seal over old sealant
- Colour picked to suit the job
- Rated 4.9 stars on Google
- Approved under the ARBOMaster scheme
Take a look at what affects the cost and what customers say.
Outside joints around Crowell
With historic houses such as Adwell House (about 2.9 miles west) nearby, there’s older building stock in the area around Crowell as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you look after a building such as Mill Lane Community Primary School, larger buildings have long runs of movement joint that eventually need resealing. Letting a property close to Princes Risborough station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
Crowell is about 4 miles south-east of Thame, in Oxfordshire. Homes, rented property, offices and hotels in Crowell is covered for external mastic, old or new, large or small. Every job comes with our 12-month guarantee. Across Oxfordshire, we cover 443 places, Crowell among them. For nearby work, see our Oxford page (14 miles or so).
All of OX39 is covered for external mastic, from the main roads to the quietest streets. Close by, we work in Kingston Blount (1 mile west), Oakley (1 mile north-east), Crowell Hill (1 mile south-east), Aston Rowant (1 mile south-west) and Postcombe (2 miles west). Within a short drive, we also cover Oxford (14 miles west), Didcot (15 miles west), Abingdon-on-Thames (15 miles west), Thame (4 miles north-west), Henley-on-Thames (11 miles south) and Benson (9 miles south-west).
Around Crowell
Around Crowell, our work takes us to homes and buildings near The Shepherd's Crook pub. For rail, the closest station is Princes Risborough station, roughly 3.9 miles north-east. A little further out are Thame Community Hospital (4.2 miles north-west). For a walk, there’s Oakley Hill nature reserve and Bald Hill.
Common problems we fix in Crowell
Some movement joints have been pointed up with mortar. The joint can’t move, so the wall cracks somewhere else instead.
The problems people usually mention when they call include:
- Joints with sealant missing in places
- Failed seals between different materials
- Joints pointed up with cement by mistake
- Water getting into walls through failed joints
For an older house near a landmark such as Church of the Nativity of the Blessed Virgin Mary, an extension built onto an older house moves differently, and the joint between them takes the strain.
What your quote should include
- Who does the work, and how experienced they are
- Which sealant they’ll use, and why
- What insurance they hold
- What happens if they find a problem under the old sealant
When something else is needed
We’d rather tell you now than do work that will not last, so these are the limits:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Cracking across the wall rather than at a joint
- Subsidence or other structural problems
If you are not sure, just call 0345 464 0079 or email us and we’ll give you a straight answer.
Joints and surfaces we work on
- Joints between brick and frames
- Copings & trims
- Façade panels
- Render & cladding joints
- Concrete & block
- Brickwork movement joints
Questions from Crowell
Can you help a landlord with a rental near Princes Risborough station?
Yes. We work for landlords and agents as well as homeowners. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we will send you a clear quote.
Is Crowell within the area you cover?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Do you hold any approvals?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Are you fully insured?
Yes. We’re fully insured.
Can I do it myself?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional.
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.
Will you leave a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
How do I get a quote for external mastic in Crowell?
Size, access and the old material all affect the cost. Ask us for a quote and we’ll talk you through it.
What affects the quote in Crowell
There’s no set price list. What we look at:
- The size of the job
- Whether there’s mould to deal with
- How much old sealant there is and how hard it is to remove
- The product the joint needs
Doing several joints on one visit is normally more efficient than separate visits, so it’s worth mentioning everything you’d like done. You will get one clear quote for the whole job.
What to tell us for a quote
To help us quote quickly, let us know:
- Pictures of the joints, sent by email
- The problem you’ve noticed
- Roughly how big the job is
- How we’d reach the joints
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we’ll explain what’s involved before giving you a price.
Nearby places to Crowell
What else we do in Crowell
The process
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The work itself takes a few hours to a few days, depending on the length of joint and the access. Somewhere like Crowell needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- The old mastic and anything lodged in the joint is removed.
- The joint faces are cleaned and primed where the sealant needs it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Preparing for the visit
- Let us know if you’ve seen damp or leaks
- Mention if the joints have been sealed before
- Mention any sign-in or site rules at work premises
Get a quote
There’s no standard price list. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or send us an email.