West Sussex · England
External Mastic in Walderton
External mastic for Walderton, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Joints where the bead has come unstuck
- Failed seals between different materials
- Weeds or debris growing in open joints
External mastic for homes and businesses in Walderton
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Porous or awkward surfaces are primed where the sealant needs it, and we do not skip that step. Common call-outs are for moss and dirt in joints with no sealant left and old sealant gone brittle and cracked, on concrete & block, façade panels and joints between brick and frames.
In a village or hamlet like Walderton, older cottages and farm buildings often stand in the open, so walls and rooflines take the full force of wind and rain. Joints on those walls need a sealant that moves with the building and stays in place.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Location
- Walderton (PO18)
- Wider area
- West Sussex
- Guarantee
- One year on every job
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Why deal with it now?
An open joint keeps letting water into the wall with every downpour. Wet masonry is more easily damaged by frost around the joint, so the problem grows beyond the joint itself. Older cottages and farmhouses around Walderton can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
The cost reflects the work involved, not guesswork. That’s why we ask about the job first.
What you get with us
- Neat joints and a tidy finish
- Colour agreed with you before we start
- Domestic, commercial and hotel work
- Full insurance on every job
Read what affects the cost and what customers say.
What external mastic looks like in Walderton
Historic houses like Uppark (about 4.3 miles north) are a reminder that the area around Walderton 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, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you let a flat or house near Nutbourne station, split movement joints are easy to miss on a rental until damp shows inside. In the older streets around The Parish Church of St Mary, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Walderton is about 5 miles east of Havant, in West Sussex. Jobs in Walderton get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. Walderton is one of 371 towns and villages in West Sussex where we work for external mastic. There’s also a page for Portsmouth, roughly 10 miles from Walderton.
Here we cover the PO18 postcode area for external mastic. Close by, we work in Lordington (1 mile south-west), Racton (1 mile south-west), Funtington (2 miles south-east), Hambrook (2 miles south) and West Ashling (3 miles south-east). Within a short drive, we also cover Bognor Regis (11 miles south-east), Chichester (6 miles south-east), Selsey (12 miles south), Emsworth (4 miles south-west), Portfield (6 miles south-east) and Yapton (13 miles south-east).
What’s near Walderton
We work in homes and buildings around Stansted Park, among other places. The closest station to Walderton is Nutbourne station, roughly 3.1 miles south of the centre. Other landmarks nearby include Havant War Memorial Hospital (5.3 miles south-west) and Warblington Castle (4.9 miles south-west). Open spaces near Walderton include Walderton Down and Kingley Vale National Nature Reserve.
Can I do it myself?
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
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, then guaranteed for a year.
Quotes for external mastic in Walderton
Jobs vary more than people expect. What affects the quote:
- The number and length of the joints
- Whether there’s mould to deal with
- Whether the work is at height
- Which sealant suits the joint
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
What we need to know
Photos help, but a description is a good start. Try to tell us:
- If it’s domestic, commercial or a hotel
- Any previous sealing or DIY work
- The address or postcode of the job
- The problem you’ve noticed
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that is easy.
What we do, step by step
There is not much for you to do on the day. Point us to the joints and we’ll get on with it. The work itself takes a few hours for a handful of joints, longer for a whole elevation. For a village or hamlet like Walderton, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- 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.
- We gun in low-modulus sealant and tool it neatly.
Before we arrive
- Let us know about parking restrictions
- Tell us about any previous sealing or DIY attempts
- Tell us about access, such as stairs, a lift or high-level joints
Ask for a quote
Getting a quote is simple: let us know the job and the location. A few pictures by email make the job easier to understand.
Read more
Places near Walderton
Also in Walderton
Aftercare tips
How long the joints last depends on use and care. Here’s what we suggest:
- Show decorators and builders where the movement joints are
- Check external joints each spring
- Don’t let climbing plants root in the sealant
- Make sure movement joints are not pointed over
Don’t let soil, plants or ivy build up against the new joints. Anything that holds water against the joint wears it out sooner.
Once a joint can’t move, the wall finds another way, generally as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
Landlords, agents and businesses in Walderton
We also work for property managers and facilities teams in Walderton and across West Sussex. Several sites can be quoted together.
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
Different surfaces, different methods
Joints between dissimilar materials
Brick against render, concrete against metal, stone against timber: every change of material is a joint. A flexible sealant bridges the two so neither cracks the other.
Copings and trims
Coping and trim joints face rain and sun head on. Each is resealed with a weatherproof, flexible sealant.
FAQs for Walderton
Is Walderton in your area for external mastic?
Yes, Walderton is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or drop us an email and tell us what needs doing, and we’ll send you a clear quote.
I let a flat near Nutbourne station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear quote.
Can you seal joints between render and window frames?
Yes. Materials like render, brick, metal and uPVC all move differently, so the joint between them must be flexible. We choose one that suits both surfaces.
Can you seal over the old sealant?
No. Fresh sealant doesn’t stick to old sealant, and it traps any mould or water underneath. We remove it all first.
Can you match the colour of my brickwork?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We pick the one that suits your wall best so it does not stand out.
Are you fully insured?
Yes. Full insurance covers our work.
How do you reach high-level joints?
That depends on how high the joints are and the ground below. Low-level joints are straightforward; for higher ones, send details and we’ll confirm the access.
Are you ARBOMaster approved?
Yes. We are approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.