West Sussex · England
External & façade joints in Kent Street, West Sussex
Movement joints in Kent Street need attention? We remove the old material, prepare the joints and seal them properly, with a 12-month guarantee.
- Movement joints filled with mortar instead of sealant
- Failed sealant between panels on a façade
- Gaps where render, brick and frames meet
How the job changes by surface
Render joints
Render is weaker at the surface than brick, so a low-modulus sealant is kinder to the joint edges. We prime where the product needs it.
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. Their movement joints are sealed over backing rod with a flexible sealant.
About our external mastic in Kent Street
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible sealant bridges the two where mortar or filler would crack. Common call-outs are for movement joints filled with mortar instead of sealant and brick movement joints where the sealant has split, on render & cladding joints, joints between brick and frames and brickwork movement joints.
Somewhere as small as Kent Street, homes and farm buildings often face open ground, where walls and rooflines take the weather head on. Gutter joints and wall joints there need a sealant that can flex and stay put.
All our work comes with a one-year guarantee, wherever you are in West Sussex.
- Where
- Kent Street (RH13)
- Region
- West Sussex
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Kent Street questions
Is external mastic in Kent Street guaranteed?
Every job comes with our one-year guarantee, wherever it is. We’re also fully insured and ARBOMaster approved.
Will you come out to Kent Street?
Yes, we do. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Do I have to be there?
We need access to the joints, so we will agree that with you when we book. For inside work, that normally means someone being in.
How much does external mastic cost in Kent Street?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote.
Are you ARBOMaster approved?
Yes. We are approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
How long should I leave it?
That depends on the sealant used, so please follow the time we give you.
How long does external mastic last?
It varies with how exposed the wall is and how much the joint moves. Look for splits, hardening or edges coming away and have them redone then.
Where is Mr Mastic based?
We’re based in Crawley, West Sussex, and we work across South East England, London and Scotland.
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. A few tips:
- Avoid pressure-washing directly into sealant joints
- Keep movement joints as flexible joints, not mortar
- Do not let climbing plants root in the sealant
- Look over the joints every year, ideally after winter
Keep pressure washers away from the sealant. A strong jet can damage the edges of the bead.
A joint that has stopped moving pushes the movement elsewhere, often as cracks near the joint. Catch it early and you reduce the risk.
How we quote for external mastic
Some jobs are bigger than they look, and some smaller. The main factors:
- Whether there’s mould to deal with
- The product the joint needs
- How many areas need sealing
- Working hours on commercial sites
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. You will know the price before we begin.
Asking for a quote
Photos help, but a description is a good start. Try to tell us:
- What the problem is, such as mould, gaps, leaks or cracking
- The type of property
- Where the property is
- Whether it has been sealed before
Need a quote? Please call 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 we start.
What we’re called out for in Kent Street
Joints sealed without backing rod, or far too deep, rarely last. If the sealant sticks to the back as well as the sides, it cannot stretch and rips as the joint opens.
Any of these means the joints need attention:
- Hard, crazed mastic that has stopped moving
- Plants rooting in failed movement joints
- Joints where the bead has come unstuck
- Movement joints filled with mortar instead of sealant
Around Kent Street, as everywhere, external mastic is only as good as the preparation behind it.
What your quote should include
- How the joint is cleaned and prepared
- What guarantee comes with the work
- Whether you can choose the colour
- What insurance they hold
External mastic in Kent Street: local notes
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.
Whether the job is in Kent Street itself or nearby, the right material for each joint matters as much as a neat finish.
Kent Street is about 5 miles west of Burgess Hill, in West Sussex. Across the RH13 area, we can carry out external mastic at your property. Our West Sussex coverage runs to 371 places, Kent Street among them. We also work in Crawley, around 10 miles away.
Our applicators cover all of RH13 for external mastic and the streets around it. Other places close to Kent Street include Wineham (1 mile south-east), Cowfold (1 mile north-west), Twineham Green (2 miles east), Shermanbury (2 miles south-west) and Twineham (2 miles south-east). Larger places within reach include Crawley (10 miles north), Horsham (7 miles north-west), Worthing (12 miles south-west), Haywards Heath (7 miles east), Burgess Hill (5 miles east) and East Grinstead (15 miles north-east).
Around Kent Street
Other landmarks nearby include The Dene Hospital (3.8 miles east). Not far away are Knepp Wildland.
How the visit works
At the end, we look at the finished work together and explain the cure time. The visit itself generally takes a few hours for a handful of joints, longer for a whole elevation, depending on how much there is to do. In a small place like Kent Street, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- Mention any tricky access
- Let us know if you’ve seen damp or leaks
- Tell us about any previous sealing or DIY attempts
Get a quote
Every job is quoted individually, so start by telling us what you need. Simply call 0345 464 0079 or send us an email and describe the job and send pictures if you have them.
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Work for landlords, hotels and businesses
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Towns and villages near Kent Street
Other services in Kent Street
What happens if it’s left?
A properly done movement joint is an even line in a colour that suits the wall. A rushed bead with no backing looks untidy and does not last. Around Kent Street, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all make a difference, and we will explain the quote if you ask.
Why us?
- Over 20 years’ experience
- Every job guaranteed for a year
- Tidy, careful work
- 4.9 on Google from 180+ five-star reviews