Essex · England
External Mastic in Gaston Green
Sealing brickwork movement joints, render, cladding and façade joints for homeowners, landlords and businesses in Gaston Green. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Old sealant gone brittle and cracked
- Joints where the bead has come unstuck
- Brick movement joints where the sealant has split
External mastic in Gaston Green
A movement joint is a deliberate break that lets a wall expand and contract. Its sealant has to flex with the building, season after season, so once it splits or hardens, the joint stops working and water gets in. If you have water getting into walls through failed joints and movement joints with cracked, split or missing sealant, we can help, on render & cladding joints, façade panels and copings & trims alike.
Around Gaston Green, older buildings can be stone, brick or timber-framed, many with extensions added later. Where one material meets another is where water usually gets in.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Place
- Gaston Green (CM22)
- Region
- Essex
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Looking after it afterwards
How long the joints last depends on use and care. Here’s what we suggest:
- Have failed joints looked at early
- Walk round the building once a year and look at the joints
- Check the sealant is paintable before painting near it
- Show decorators and builders where the movement joints are
Keep pressure washers away from the sealant. A strong jet can damage the edges of the bead.
If you can see gaps, plants or bare sections in a joint, have it checked. Early work is quicker and leaves a better finish.
Should I try it myself first?
A DIY attempt does not rule out a professional job. We cut it out and start again, so just mention it when you contact us.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
Gaston Green questions
Do you work for landlords with property near Sawbridgeworth station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we will give you a clear price.
Do you cover Gaston Green for external mastic?
Yes. We work across London and the South East, and Gaston Green is part of that. You can ring 0345 464 0079 or drop us an email and tell us what needs doing, and we’ll give you a clear price.
Will the old sealant be removed?
Yes. We cut out all the old sealant and clean the joint before applying anything new.
Do the sealants smell?
Some sealants have a smell while they cure. Opening a window helps.
Will the new joint stand out?
We aim for a joint that suits the wall rather than one that jumps out. Colour is agreed with you before we begin from the range available.
Is it OK to seal over old sealant?
No. We remove every bit of old sealant first.
Where is Mr Mastic based?
We work from Crawley. We cover Gaston Green and the rest of Essex, along with the rest of our area.
Is there a guarantee?
Yes. There’s a 12-month guarantee on every job, large or small.
Also near Gaston Green
More services for Gaston Green
Why act early in Gaston Green
Done well, a resealed joint is a neat, straight line that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner, so it pays to do it properly once. Around Gaston Green, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference.
Why book with us
- Full insurance on every job
- Homes, businesses and hotels
- Arbo and Everbuild products
- Colour picked to suit the job
Take a look at our cost guide and what customers say.
What the job involves on each surface
Concrete and blockwork
Concrete faces can be dusty and porous, so preparation is key. We prime where the sealant needs it.
Cladding and façade panels
Where a cladding system has its own specified sealant, we follow it, or one the system allows. Send us any details you have about the façade.
How we quote for external mastic
For a quick quote, just ask. What matters most is:
- The old material and how stubborn it is
- The number of rooms or windows
- The size of the job
- Mould in or behind the old joints
The cost depends on how much there is to do, how much old material has to come out and access to the work. You will have a clear quote before any work starts, so you know where you stand.
What to tell us for a quote
To make quoting easier, please include:
- What’s wrong with the joints now
- The address or postcode of the job
- Any access issues, like height or stairs
- How many joints, rooms or windows are involved
Need a quote? Please ring 0345 464 0079 or email us with a few details. You will know what we plan to do, and what it will cost, before any work begins.
What we’re called out for in Gaston Green
UV, rain and frost all age exterior sealant. Over the years it hardens, cracks on the surface and loses its give, so the joint eventually tears or comes away from one side.
The problems people normally mention when they call are:
- Water getting into walls through failed joints
- Failed sealant between panels on a façade
- Brick movement joints where the sealant has split
- Gaps where render, brick and frames meet
Letting a property close to Sawbridgeworth station? Then split movement joints are easy to miss on a rental until damp shows inside.
Comparing quotes
- What the quote includes, VAT included or not
- How the joint is cleaned and prepared
- Who turns up on the day
- Which colour the sealant will be
Outside joints around Gaston Green
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Barrington Hall (about 3.2 miles east) are a reminder that the area around Gaston Green has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
Homes close to Church of St Mary the Virgin include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant. For site and facilities teams at buildings such as Spellbrook CofE Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Gaston Green is about 3 miles south of Bishop's Stortford, in Essex. Gaston Green gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Gaston Green is one of 644 towns and villages in Essex we cover for external mastic. We also work in Chelmsford, around 15 miles away.
Postcode districts we cover here for external mastic: CM22. You’ll find streets such as Sawbridgeworth Road and Old Mill Lane, all of which we cover. If you are just outside Gaston Green, we cover Little Hallingbury (1 mile north), Spellbrook (1 mile west), Thorley Street (1 mile north-west), Lower Sheering (2 miles south) and Thorley (2 miles north-west). Larger places within reach include Chelmsford (15 miles south-east), Harlow (5 miles south-west), Brentwood (15 miles south), Loughton (14 miles south), Saffron Walden (13 miles north) and Waltham Abbey (12 miles south-west).
What’s near Gaston Green
We work in homes and buildings around Leventhorpe and The George pub, among other places. Gaston Green’s nearest station is Sawbridgeworth station, roughly 1.4 miles south-west of the centre. A little further out are Harlow Mill (3.5 miles south-west) and Herts and Essex Hospital (2.3 miles north). Open spaces near Gaston Green include Sawbridgeworth Marsh and Portingbury Hills.
How the visit works
We work through the job in order: protection first, then preparation, sealing and a tidy-up. Typically it takes a few hours for a handful of joints, longer for a whole elevation and we leave things clean and tidy. For a village or hamlet like Gaston Green, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- Tell us about any water getting in
- On commercial sites, let us know about site rules
- Tell us about any previous sealing or DIY attempts
Getting a quote
We do not publish a price list, because every job is different. Instead, your job gets its own clear quote. To get started, ring 0345 464 0079 or email us.