Hertfordshire · England
External & façade joints in Thorley, Hertfordshire
We cover Thorley for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly.
- Sealant pulling away from one side of the joint
- Brick movement joints where the sealant has split
- Failed seals between different materials
Leave it or put it right?
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, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we will go through it with you.
What you get with us
- ARBOMaster approved applicator
- Experience in homes, commercial sites and hotels
- Arbo and Everbuild products
- A choice of colours where the product allows
See what affects the cost and what customers say.
External mastic in Thorley
Joints in render and cladding are easy to overlook until a damp patch appears. We look over the joints, agree the ones to renew and reseal with a flexible, weatherproof product in a matching colour. We work on render & cladding joints, brickwork movement joints and copings & trims, and the jobs we see most are rain getting behind render or cladding at a joint and joints where the bead has come unstuck.
Outside joints can only be sealed when they’re dry, so work in Thorley is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
We stand behind the work with a 12-month guarantee, so you are covered after we have gone.
- Place
- Thorley (CM23)
- Wider area
- Hertfordshire
- Cover
- 12 months on all our work
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What happens on the day
A visit follows a simple pattern: we look at the joints together, protect the area around them, do the work and clear up. Most jobs take anything from a few hours to several days, depending on the building. Somewhere like Thorley needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- 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.
- We apply the sealant, tool it and check the whole run.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- Mention any parking rules near the property
- Clear items away from the joints we’re working on
How to get 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 email photos if that’s easy.
Read more
Aftercare tips
Once the sealant has cured, a few habits help it last:
- Have failed joints looked at early
- Make sure movement joints are not pointed over
- Point out the joints to other trades
- Wash walls gently around the sealant
Don’t let soil, plants or ivy build up against the new joints. Anything that holds water against the joint wears it out sooner.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.
Should I try it myself first?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is.
FAQs for Thorley
I let a flat near Bishops Stortford station. Can you help?
Yes, we work for landlords and agents. You can call 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before we start.
Will you come out to Thorley?
Yes, we do. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Do you seal joints where cladding meets other materials?
Yes. We cut out the old sealant, prepare both faces and reseal with a flexible exterior product. We pick a colour that works with both materials.
Should I point up the gap in my brickwork?
No, not where the gap is a movement joint. Filling it with mortar defeats its purpose, and the wall may crack nearby. We’ll reseal it with a flexible sealant.
Do you remove the old sealant?
Yes. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Do you have insurance?
Yes, we are fully insured for domestic and commercial work.
Will the new joint stand out?
The aim is a neat, even joint in a colour that suits the wall. Colour is agreed with you before we begin.
How long does external mastic take?
As a guide, most jobs take a few hours for a handful of joints, longer for a whole elevation. Bigger jobs take longer, and we’ll tell you how long to expect.
Landlords, agents and businesses in Thorley
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll quote.
Places near Thorley
More services for Thorley
What external mastic looks like in Thorley
With historic houses such as Much Hadham Palace (about 2.9 miles west) nearby, there’s older building stock in the area around Thorley as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Letting a property close to Bishops Stortford station? Then outside joints that have cracked can let damp into a rental, so check them between lets. Schools such as Richard Whittington Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing. For an older house near a landmark such as Parish Church of St James the Great, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Thorley is about 1 mile south-west of Bishop's Stortford, in Hertfordshire. Our applicators cover external mastic for householders, landlords and businesses in Thorley and the surrounding area, as part of our work across Hertfordshire. 381 places in Hertfordshire are on our list, from the larger towns to small villages. There’s also a page for Chelmsford, roughly 17 miles from Thorley.
Every address in CM23 is covered for external mastic. We also cover Thorley Street (1 mile east), Spellbrook (1 mile south-east), Bishop's Stortford (1 mile north-east), Little Hallingbury (2 miles south-east) and Allen's Green (2 miles south-west). We also work in nearby towns such as Stevenage (14 miles west), Welwyn Garden City (15 miles west), Hoddesdon (9 miles south-west), Cheshunt (13 miles south-west), Hertford (10 miles west) and Ware (8 miles west).
Landmarks near Thorley
Locally, jobs take us to homes and businesses close to Coach And Horses Public House and The Bishop's Stortford High School, among other places. The nearest railway station is Bishops Stortford station, roughly 1.5 miles north-east. Other landmarks nearby include Bishops Stortford Local History Museum (2.4 miles north) and Moated mound (3 miles north-west). The countryside around Thorley includes Portingbury Hills and Thorley Wash nature reserve.
What the job involves on each surface
Render joints
Water behind render can lead to blown patches. A sound joint keeps the render dry behind and helps it last.
Concrete and blockwork
Blockwork and concrete shrink over time and move with the seasons. We reseal their joints with backing rod and a flexible product.
What sealant work can’t fix
We won’t take on work that won’t last, so here’s what sealant cannot put right:
- Cracks in the bricks or render themselves, away from the joints
- Subsidence or other structural problems
- Damp that isn’t coming from the joint
Not sure which it is? You can phone 0345 464 0079 or send us an email and we will tell you honestly.
Joints and surfaces we work on
- Copings & trims
- Façade panels
- Brickwork movement joints
- Concrete & block
- Joints between brick and frames
- Render & cladding joints