Oxfordshire · England
External & façade joints in Crawley, Oxfordshire
Movement joints in Crawley need attention? We cut out the old, prepare the joints and apply the right sealant, with a one-year guarantee.
- Plants rooting in failed movement joints
- Rigid filler in a joint that should flex
- Sealant pulling away from one side of the joint
How we handle external mastic in Crawley
Low-level joints can generally 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’s needed to reach them safely. We work on concrete & block, façade panels and brickwork movement joints, and common reasons people get in touch are rain getting behind render or cladding at a joint and gaps where render, brick and frames meet.
Around Crawley, older buildings can be stone, brick or timber-framed, many with extensions added later. Where one material meets another is where water normally gets in.
We stand behind the work with a one-year guarantee, so you’re covered after we’ve gone.
- Place
- Crawley (OX29)
- Region
- Oxfordshire
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Should I try it myself first?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
Aftercare tips
Joint life depends on how it’s used and looked after. We suggest:
- Wash walls gently around the sealant
- Fix overflowing gutters above sealed joints
- Keep movement joints as flexible joints, not mortar
- Check the sealant is paintable before painting near it
Make sure anyone working on the wall later knows where the movement joints are. They must stay as flexible joints, never rendered or pointed over.
Once a joint cannot move, the wall finds another way, normally as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
When to call us in Crawley
Every building moves. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. All of that ends up in the joint sealant.
Common reasons people contact us are:
- Weathered mastic that no longer stretches
- Failed sealant between panels on a façade
- Weeds or debris growing in open joints
- Movement joints filled with mortar instead of sealant
If you look after a building such as Hailey 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
- Whether VAT is included
- Whether you can choose the colour
- How the surfaces are prepared before sealing
- When the joint can take water or movement
How the job changes by surface
Copings and trims
Copings expand and contract through the day, so the joints need a sealant that stays flexible in all weathers.
Cladding and façade panels
Panel systems often rely on sealant between and around the panels. Each joint gets a sealant that suits the panel and its movement.
What external mastic looks like in Crawley
Historic houses like Minster Lovell Hall (about 1.1 miles west) are a reminder that the area around Crawley 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. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you let a flat or house near Finstock station, split movement joints are easy to miss on a rental until damp shows inside. In the older streets around Church of St John the Evangelist, an extension built onto an older house moves differently, and the joint between them takes the strain.
Crawley is about 1 mile north-west of Witney, in Oxfordshire. Every kind of property in Crawley is covered for external mastic. The work is guaranteed for a year. Our Oxfordshire coverage runs to 443 places, Crawley among them. You can also see our page for Oxford, about 12 miles away.
All of OX29 is covered for external mastic. If you need external mastic at a property on Witney Hill, Farm Lane and Foxburrow Lane or anywhere close by, we can help. If you are just outside Crawley, we cover Leafield (2 miles north-west), Swinbrook (4 miles west), Ascott d'Oyley (4 miles north-west), Ascott-under-Wychwood (5 miles north-west) and Ascott Earl (5 miles north-west). Within a short drive, we also cover Oxford (12 miles east), Abingdon-on-Thames (13 miles south-east), Carterton (5 miles south-west), Wantage (15 miles south), Grove (14 miles south) and Faringdon (11 miles south).
Near you in Crawley
We work in homes and buildings around Wood Green School and The Lamb Inn, among other places. The closest station to Crawley is Finstock station, about 3.6 miles north-east. Well-known places in the area include Cogges Manor Farm Museum (1.9 miles south-east). For a walk, there’s Blenheim Farm.
What affects the quote in Crawley
Your quote is based on your job. We look at:
- Any working-time requirements on site
- How much old sealant there is and how hard it is to remove
- How much there is to do
- Any mould that needs treating
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Helping us quote
When you call or email, these details help:
- If it’s domestic, commercial or a hotel
- What the problem is, such as mould, gaps, leaks or cracking
- If someone has resealed it before
- How we’d reach the joints
Need a quote? Please phone 0345 464 0079 or drop us an email and tell us about the job. We’ll explain what we’d do and give you a clear quote before work begins.
Why act early in Crawley
Mortar or ordinary filler might look like a quick way to close an open joint, but it stops the joint moving. The wall then cracks somewhere else. A flexible sealant over backing rod is what the joint needs. Older cottages and farmhouses around Crawley can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
Leaving a failed joint usually makes the job bigger, not smaller, because water and mould keep working on it. If you are not sure whether it needs doing, call 0345 464 0079 or email us and we will give you an honest view and a quote.
Why book with us
- Anti-fungal sanitary silicone in wet areas
- Trusted Arbo and Everbuild sealants
- Colour picked to suit the job
- Homes, businesses and hotels
Take a look at how sealant jobs are priced and our reviews.
What happens on the day
You do not need to clear the whole room or building before we come, just the space around the work. Everything nearby is protected, and the job takes a few hours to a few days, depending on the length of joint and the access for a typical job. In a small place like Crawley, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- We cut out the failed sealant and rake out any dirt or growth.
- We clean both faces of the joint and prime them where the product calls for 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.
Getting ready for the visit
- Tell us if parking is tricky
- Tell us about any water getting in
- Clear items away from the joints we are working on
Ask for a quote
Every job is quoted individually. Just ring 0345 464 0079 or drop us an email with the details.
Read more
What else we do in Crawley
Crawley: your questions answered
Is Crawley in your area for external mastic?
Yes, Crawley 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, and we’ll give you a clear quote.
Do you cover smaller places like Crawley?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
What sealant do you use?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Will you leave a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
Is it worth trying it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Are you fully insured?
Yes, we’re fully insured for domestic and commercial work.
Can a movement joint be filled with mortar?
No. A mortar-filled joint cannot move, so the wall cracks somewhere else instead. Use a flexible sealant with backing rod.
How long will you be here?
That depends on how much there is to do, but as a guide it takes a few hours to a few days, depending on the length of joint and the access. We’ll tell you when we quote.