Hertfordshire · England
Green Tye External Mastic
Specialist external mastic for Green Tye: careful preparation, the right product and tidy work. Call for a quick quote.
- Movement joints filled with mortar instead of sealant
- Sealant that has lost its bond to the brick or render
- Movement joints with cracked, split or missing sealant
Why deal with it now?
It often makes sense to reseal all the failing joints on an elevation together. They’ve weathered the same way and it means sorting access once. Older cottages and farmhouses around Green Tye can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Rather than a set price list, 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.
What you get with us
- 180+ five-star Google reviews
- Old sealant always removed completely
- You choose the colour before work begins
- We are fully insured
Take a look at what affects the cost and customer reviews.
How we handle external mastic in Green Tye
Getting the depth right is half the job. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, so it bonds to the two sides only and can stretch. Common call-outs are for weeds or debris growing in open joints and old sealant gone brittle and cracked, on joints between brick and frames, brickwork movement joints and copings & trims.
Older homes in small places like Green Tye may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water normally gets in, and they need the right sealant at the right depth.
We guarantee the work for a year. If something is not right with it in that time, tell us and we’ll put it right.
- Location
- Green Tye (SG10)
- Region
- Hertfordshire
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Walls and rooflines in Green Tye
With historic houses such as Much Hadham Palace (about 1.3 miles north-west) nearby, there’s older building stock in the area around Green Tye 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. London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For landlords with property near Bishops Stortford station, outside joints that have cracked can let damp into a rental, so check them between lets. If you live in an older home near Church of St Thomas, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Green Tye is about 3 miles south-west of Bishop's Stortford, in Hertfordshire. For external mastic in and around Green Tye, it’s easy to get a quote: please phone 0345 464 0079 or drop us an email. We’re based in Crawley and cover Hertfordshire. 381 places in Hertfordshire are on our list. For nearby work, see our Chelmsford page (18 miles or so).
Jobs for external mastic in SG10 works the same way as everywhere else we cover. If you are just outside Green Tye, we cover Hadham Cross (1 mile west), Much Hadham (1 mile north-west), Nether Street (2 miles south-west), Hadham Ford (2 miles north) and Widford (2 miles south-west). Further out, we also cover Stevenage (13 miles west), Bishop's Stortford (3 miles north-east), Welwyn Garden City (13 miles west), Hoddesdon (8 miles south-west), Cheshunt (11 miles south-west) and Hatfield (15 miles west).
Landmarks near Green Tye
The nearest railway station is Bishops Stortford station, about 3.2 miles north-east. A little further out are Herts and Essex Hospital (3.6 miles north-east) and Henry Moore Studios and Gardens (0.8 miles south-west). Open spaces near Green Tye include Thorley Wash nature reserve.
Questions from Green Tye
Can you do external mastic in Green Tye?
Yes, Green Tye is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or email us and let us know what needs doing, and we’ll give you a clear price.
Do you work for landlords with property near Bishops Stortford station?
Yes, landlords and agents are among the people we work for. You can call 0345 464 0079 or send us an email with the details for a clear quote.
Are you fully insured?
Yes, we are fully insured for domestic and commercial work.
Can a movement joint be filled with mortar?
No, not if it’s a movement joint. Filling it with mortar defeats its purpose, and the wall may crack nearby. A flexible sealant is the right fill.
Can you work on commercial sites?
Yes. We have worked for hotels, offices and other businesses, and we’re fully insured.
Do you remove the old sealant?
Yes, always, and completely. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
What sealant do you use?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Can you do several jobs on one visit?
Yes. Tell us about everything you’d like done.
How we quote for external mastic
You’ll get a clear quote before we start. It’s based on:
- How many rooms, windows or areas are involved
- When we can work, for business premises
- The old material and how stubborn it is
- The type of sealant required
The cost reflects the work involved, not a rough estimate. That is why we ask a few questions first.
What we need to know
When you call or email, these details help:
- Any access issues, like height or stairs
- Whether it has been sealed before
- The address or postcode of the job
- What the problem is, such as mould, gaps, leaks or cracking
For a quote, call 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. We will give you a clear quote before any work starts.
How the job changes by surface
Render joints
The face of render can be soft, so a sealant that stretches easily protects the edges. Priming is done where the sealant calls for it.
Joints between dissimilar materials
Brick against render, concrete against metal, stone against timber: every change of material is a joint. We seal the joint with a flexible exterior sealant.
Work for landlords, hotels and businesses
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together, and we are fully insured for the work.
What we can’t put right
To be straight with you, there are a few things sealant will not fix:
- Cracking across the wall rather than at a joint
- Structural movement, which needs a surveyor or engineer
- Adding movement joints to masonry that has none
If in doubt, call 0345 464 0079 or send us an email and we will say what we think.
What we seal
- Brickwork movement joints
- Render & cladding joints
- Façade panels
- Joints between brick and frames
- Copings & trims
- Concrete & block
Places near Green Tye
More services for Green Tye
The process
We work through the job in order: protect, prepare, seal, tidy. Typically it takes a few hours for a handful of joints, longer for a whole elevation, and the area is left clean. For a village or hamlet like Green Tye, 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.
- First, the joints are inspected and the access agreed.
- 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.
- We apply the sealant, tool it and check the whole run.
Getting ready for the visit
- Let us know if you’ve seen damp or leaks
- Move anything stored near the joints
- Mention if the joints have been sealed before
Ask for a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and add photos by email if you can.
Advice
Keeping the joints in good condition
After the cure time, these simple habits help:
- Keep movement joints as flexible joints, not mortar
- Fix overflowing gutters above sealed joints
- Point out the joints to other trades
- Act on the first splits you see
Keep pressure washers away from the sealant. High-pressure water can lift the edges.
If you can see gaps, plants or bare sections in a joint, have it checked. Early work is quicker and leaves a better finish.