Hertfordshire · England
External & façade joints in Thorley Street, Hertfordshire
External mastic for Thorley Street and the surrounding area: careful preparation, the right product and tidy work. Call for a quick quote.
- Failed sealant between panels on a façade
- Movement joints filled with mortar instead of sealant
- Cracked joints where brick meets render or frames
Why deal with it now?
Sealing over the top of old mastic does not hold for long. The new layer can’t bond properly to old, weathered material, so we always take the old sealant out. Where a wall is exposed, as many are in small places like Thorley Street, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Combining jobs into one visit is generally more efficient than separate visits, so tell us about everything that needs sealing. We will send you a clear quote for the lot.
Why Thorley Street customers choose us
- Anti-fungal silicone where joints get wet
- Trusted Arbo and Everbuild sealants
- Approved under the ARBOMaster scheme
- Colour agreed with you before work begins
External mastic for homes and businesses in Thorley Street
For buildings in Thorley Street, we reseal external joints of all kinds, from brick movement joints to cladding panels. Every joint gets the same careful preparation: clean joint faces and the right depth. If you’re dealing with weeds or debris growing in open joints and rigid filler in a joint that should flex, we can put it right.
Somewhere as small as Thorley Street, homes and farm buildings often face open ground, 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.
Big or small, you get the same one-year guarantee.
- Place
- Thorley Street (CM23)
- Region
- Hertfordshire
- Guarantee
- A year, on every job
- Quote
- A clear price before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
External mastic in Thorley Street: local notes
Historic houses like Much Hadham Palace (about 3.6 miles west) are a reminder that the area around Thorley Street 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. 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.
If you live in an older home near Parish Church of St James the Great, old and new materials meet at the roofline and walls, which is where sealant earns its keep. Rented homes near Bishops Stortford station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Thorley Street is about 1 mile south of Bishop's Stortford, in Hertfordshire. Homes, rented property, offices and hotels in Thorley Street can book us for external mastic. Every job comes with our one-year guarantee. Our Hertfordshire coverage runs to 381 places, Thorley Street among them. We also work in Chelmsford, around 16 miles away.
Every address in CM23 is within our area for external mastic. Neighbouring places we cover for external mastic include Thorley (1 mile west), Spellbrook (1 mile south), Little Hallingbury (1 mile south-east), Bishop's Stortford (1 mile north) and Gaston Green (1 mile south-east). Larger places within reach include Stevenage (15 miles west), Hoddesdon (10 miles south-west), Cheshunt (13 miles south-west), Hertford (11 miles west), Ware (8 miles west) and Broxbourne (10 miles south-west).
Landmarks near Thorley Street
In Thorley Street, that means homes and buildings near Coach And Horses Public House and The Bishop's Stortford High School. Thorley Street’s nearest station is Bishops Stortford station, roughly 1.2 miles north. Well-known places in the area include Moated mound (3.4 miles north-west) and Herts and Essex Hospital (1.3 miles north-east). The countryside around Thorley Street includes Thorley Wash nature reserve and Portingbury Hills.
DIY versus a professional finish
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
Sealing over old silicone is the commonest DIY error. 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.
Also near Thorley Street
What else we do in Thorley Street
Common problems we fix in Thorley Street
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, and it tears off the sides.
These are the problems we’re asked about most:
- Brick movement joints where the sealant has split
- Plants rooting in failed movement joints
- Leaking joints around cladding and façade panels
- Cracked joints where brick meets render or frames
For site and facilities teams at buildings such as Thorley Hill Primary School, its movement joints, gutters and trims need looking after like any other building’s.
What your quote should include
- How the colour is chosen
- Whether VAT is included
- Which sealant they’ll use, and why
- What happens if they find a problem under the old sealant
What sealant work cannot fix
It helps to know what we cannot do too:
- Cracked brickwork or render that needs a builder or plasterer
- Failed render or damaged cladding panels
- Cutting new joints into brickwork, which is building work rather than sealant work
Not sure which it is? You can call 0345 464 0079 or drop us an email and we will tell you honestly.
Where we work in Thorley Street
- Brickwork movement joints
- Joints between brick and frames
- Façade panels
- Copings & trims
- Render & cladding joints
- Concrete & block
How the visit works
Once we’re on site, we check the joints match what you told us. If anything is different, we explain it before carrying on. Most jobs then take a few hours to a few days, depending on the length of joint and the access. For a village or hamlet like Thorley Street, 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 look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Before we arrive
- Tell us if parking is tricky
- Tell us about any previous sealing or DIY attempts
- Clear items away from the joints we’re working on
Ask for a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we’ll explain how we’d tackle it. When it suits you, ring 0345 464 0079 or email us.
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Questions from Thorley Street
Can you help a landlord with a rental near Bishops Stortford station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or send us an email and tell us about the property, and we will give you a clear price.
Will you come out to Thorley Street?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Where do you work from?
We are a Crawley-based firm. Our area covers South East England, London and Scotland.
Do you do commercial work?
Yes. Hotels, offices and other businesses use us.
What does external mastic cost?
We do not publish prices, because the cost depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Do you guarantee your work?
Yes, always. Each job is guaranteed for twelve months.
How often do external joints need resealing?
There’s no fixed answer: sunny, exposed elevations and busy joints wear faster. Check them each year and reseal when they split or harden. Every job carries our one-year guarantee.
Do you take out the old sealant first?
Yes. All of the old material is cut out and the joint cleaned.
Landlords, agents and businesses in Thorley Street
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. Several properties can be quoted together.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll give you a quote.
What the job involves on each surface
Concrete and blockwork
Big joints in concrete need careful depth control. We size the backing rod to the gap so the sealant isn’t too deep.
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. The movement joint takes that up, so its sealant has to stay flexible.