West Sussex · England
External Mastic in Duncton
Sealing brickwork movement joints, render, cladding and façade joints for householders, landlords and businesses in Duncton. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Sealant pulling away from one side of the joint
- Failed sealant between panels on a façade
- Failed seals between different materials
External mastic for homes and businesses in Duncton
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. We work on joints between brick and frames, brickwork movement joints and concrete & block, and people most often call us about joints pointed up with cement by mistake and panel joints letting water in.
In a village or hamlet like Duncton, older cottages and farm buildings often stand in the open, so walls and rooflines take the full force of wind and rain. Gutter joints and wall joints there need a sealant that can flex and stay put.
The work is covered for a year after we finish. If there’s a problem with it, please phone 0345 464 0079 or send us an email.
- Place
- Duncton (GU28)
- Region
- West Sussex
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
FAQs for Duncton
Is Duncton within the area you cover?
Yes. Duncton is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
What guarantee comes with external mastic in Duncton?
Every job comes with our one-year guarantee, wherever it is. We are fully insured, and an ARBOMaster approved applicator.
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. The colour is chosen to suit.
Can tenants book the work?
Yes, but check with your landlord or agent first. Landlords are often happy for the work to be arranged.
What should I tell you?
Just the basics: where it is, what you’ve noticed and how we reach it. After that, simply ring 0345 464 0079 or email us.
What is backing rod for?
That is backing rod, a closed-cell foam. It keeps the sealant at the right depth and bonded to the sides only.
Will you leave a mess?
No. We protect the surfaces around the joints, and we clear up the old sealant and our materials before we leave.
Do you work for hotels and businesses?
Yes. Larger jobs can be planned room by room or area by area.
Keeping the joints in good condition
So the new joints stay in good condition:
- Ask before painting over external sealant
- Get split or bare joints resealed while the damage is small
- Make sure movement joints are not pointed over
- Show decorators and builders where the movement joints are
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.
Small splits are the time to act. At that stage it’s a simple cut out and reseal before water has had years to get in.
When it isn’t the sealant
In fairness, there are a few things sealant will not fix:
- Structural movement, which needs a surveyor or engineer
- Damp that isn’t coming from the joint
- Loose or hollow render, which needs re-rendering
If in doubt, phone 0345 464 0079 or drop us an email and we’ll say what we think before booking.
Where we work in Duncton
- Copings & trims
- Joints between brick and frames
- Concrete & block
- Render & cladding joints
- Façade panels
- Brickwork movement joints
Why act early in Duncton
Sealing over the top of old mastic doesn’t hold for long. New sealant doesn’t bond well to old, weathered sealant, so we always take the old sealant out. Where a wall is exposed, as many are in small places like Duncton, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
We do not show prices on the website, because the cost depends so much on the job itself. For a quick quote, please call 0345 464 0079 or send us an email.
What you get with us
- More than 20 years in sealant work
- We agree the colour with you first
- Trusted Arbo and Everbuild sealants
- White, clear, grey or coloured to suit, where the product allows
Take a look at what affects the cost and our reviews.
Work for landlords, hotels and businesses
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
What we do, step by step
Before we leave, we go over the finished joints with you and explain the cure time. The visit itself usually takes a few hours to a few days, depending on the length of joint and the access, depending on how much there is to do. For a village or hamlet like Duncton, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- For indoor joints, keep the area dry beforehand if you can
- Keep children and pets away from the work area
- Tell us if parking is tricky
Getting a quote
Getting a quote is simple: let us know the job and the location. A few photos by email make the job easier to understand, and we will take it from there.
Related advice
Nearby places to Duncton
Also in Duncton
Do you need external mastic in Duncton?
Poor preparation causes many early failures: 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:
- Sealant that has lost its bond to the brick or render
- Gaps where render, brick and frames meet
- Moss and dirt in joints with no sealant left
- Rain getting behind render or cladding at a joint
If you live in an older home near Church of Holy Trinity, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Comparing quotes
- How much experience the applicator has
- What insurance they hold
- How hidden problems are handled
- Whether all the old sealant comes out first
External mastic in Duncton: local notes
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. With historic houses such as Bignor Roman Villa (about 2.4 miles south-east) nearby, there’s older building stock in the area around Duncton as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
Managing a site like Duncton CofE Junior School? Then its movement joints, gutters and trims need looking after like any other building’s.
Duncton is about 10 miles north-east of Chichester, in West Sussex. For external mastic in and around Duncton, please phone 0345 464 0079 or email us for a quick quote. We are based in Crawley and cover West Sussex, Duncton included. Our area takes in 371 places across West Sussex, large and small. Our Crawley page covers work nearby.
Jobs for external mastic in GU28 works the same way as everywhere else we cover. We cover properties on Duncton High Street and Willett Close. We also cover the places around Duncton: East Lavington (1 mile south-west), Sutton (2 miles south-east), Rotherbridge (2 miles north), Graffham (2 miles west) and Haslingbourne (2 miles north-east). Larger places within reach include Worthing (13 miles south-east), Bognor Regis (11 miles south), Chichester (10 miles south-west), Littlehampton (10 miles south-east), Emsworth (15 miles south-west) and Rustington (11 miles south-east).
Around Duncton
We work in homes and buildings around The Parish Church of St Peter, among other places. A little further out are Midhurst Community Hospital (5.4 miles north-west) and Coultershaw Heritage Site (1.6 miles north-east). The countryside around Duncton includes Bignor Hill and Graffham Common.
DIY versus a professional finish
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.