Isle of Wight · England
External & façade joints in St Helens, Isle of Wight
Sealing brickwork movement joints, render, cladding and façade joints for St Helens, backed by a 12-month guarantee. Call for a quick quote.
- Brick movement joints where the sealant has split
- Joints where the bead has come unstuck
- Cracked joints where brick meets render or frames
How we handle external mastic in St Helens
Failed sealant is cut out, the depth set with closed-cell backing rod, and the joint resealed with a low-modulus sealant made for outside. We pick a colour that sits well with the wall. Common call-outs are for cracked joints where brick meets render or frames and hard, crazed mastic that has stopped moving, on joints between brick and frames, concrete & block and façade panels.
In a village or hamlet like St Helens, older cottages and farm buildings often stand in the open, 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.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Place
- St Helens (PO33)
- Region
- Isle of Wight
- Cover
- 12 months on all our work
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Why act early in St Helens
Sealing over the top of old mastic doesn’t hold for long. The new layer cannot bond properly to old, weathered material, so the old joint is cut out fully first. Where a wall is exposed, as many are in small places like St Helens, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
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. We give a clear quote before we start.
Why choose Mr Mastic in St Helens
- Sealant colour chosen to suit
- We are fully insured
- A choice of colours where the product allows
- Rated 4.9 stars on Google
See how sealant jobs are priced and our reviews.
St Helens: your questions answered
Does living near the coast affect external mastic in St Helens?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Will you come out to St Helens?
Yes, we do. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
How long does external mastic last?
That depends on the wall, the weather and the movement. Look for splits, hardening or edges coming away.
How long should I leave it?
That depends on the sealant used, so follow the cure time we give you.
Are you an approved applicator?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
Is the work guaranteed?
Yes. Every job comes with a 12-month guarantee.
Can landlords and businesses book you?
Yes, regularly. We can quote for several properties at once.
How much does external mastic cost in St Helens?
Size, access and the old material all affect the cost. Call for a quick quote and we’ll talk you through it.
What we do, step by step
You do not need to clear the whole room or building, just the space around the work. We protect the rest, and the work takes a few hours for a handful of joints, longer for a whole elevation for a typical job. Somewhere as small as St Helens, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- Clear items away from the joints we’re working on
- Mention any tricky access
- Let us know about parking restrictions
How to get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. When it suits you, phone 0345 464 0079 or drop us an email.
Related advice
Also in St Helens
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Work for landlords, hotels and businesses
We work for landlords and letting agents as well as householders. Sealant work between tenants keeps a property looking cared for.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements.
Outside joints around St Helens
St Helens is within about 2 miles of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That is hard on movement joints and outside wall joints, especially on the side facing the sea. Historic houses like Yaverland Manor (about 2.1 miles south-west) are a reminder that the area around St Helens 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.
Schools such as St Helens Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing. If you live in an older home near St Catherine-by-the-Green, the joints between older walls, newer extensions and the roofline need a sealant that can move. If you let a flat or house near Brading station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
St Helens is about 3 miles south-east of Ryde, in the Isle of Wight. Anywhere in PO33, we can carry out external mastic at your property. St Helens is one of 125 places in the Isle of Wight we cover for external mastic. You can also see our page for Portsmouth, about 8 miles away.
All of PO33 is within our area for external mastic. External mastic is available to properties on Station Road, Upper Green Road and Old Chapel Lane. Close by, we work in Gaskins (1 mile south-west), Brading (2 miles south-west), Yarbridge (2 miles south-west), Morton (2 miles south-west) and Yaverland (3 miles south-west). Further out, we also cover Newport (8 miles west), Ryde (3 miles north-west), Cowes (9 miles north-west), Sandown (4 miles south-west), Shanklin (5 miles south-west) and Ventnor (8 miles south-west). Island and remote addresses take a little more planning, so tell us where you are when you ask for a quote.
What’s near St Helens
We work in homes and buildings around The Vine Inn. The nearest railway station is Brading station, roughly 1.8 miles south-west. Other landmarks nearby include Cothey Bottom Heritage Centre (1.5 miles north-west) and Sandown Castle (3.2 miles south-west). Green spaces nearby include Alan Hersey Nature Reserve and Bembridge Down.
Quotes for external mastic in St Helens
Call for a quick quote. What matters most is:
- How much old sealant there is and how hard it is to remove
- The product the joint needs
- When we can work, for business premises
- Access and height
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. The price is agreed before we begin.
Asking for a quote
When you contact us, it’s useful to know:
- Where the property is
- A few pictures by email, if you can
- The type of property
- Whether it has been sealed before
Getting a quote is simple: tell us what needs doing and where, and roughly how big it is. A few pictures by email make the job easier to understand, and we’ll take it from there.
What we can’t put right
To be straight with you, there are a few things sealant won’t fix:
- Loose or hollow render, which needs re-rendering
- Cutting new joints into brickwork, which is building work rather than sealant work
- Damp that isn’t coming from the joint
If in doubt, ring 0345 464 0079 or send us an email and we’ll say what we think before you book.
What we seal
- Brickwork movement joints
- Concrete & block
- Joints between brick and frames
- Render & cladding joints
- Copings & trims
- Façade panels
How the job changes by surface
Joints between dissimilar materials
Each side of the joint may need its own preparation. Both surfaces are cleaned and primed as the product requires.
Render joints
Render is weaker at the surface than brick, so a sealant that stretches easily protects the edges. Priming is done where the sealant calls for it.