Hertfordshire · England
External & façade joints in High Leigh, Hertfordshire
Sealing brickwork movement joints, render, cladding and façade joints for householders, landlords and businesses in High Leigh. Fully insured, ARBOMaster approved and guaranteed for a year.
- Movement joints filled with mortar instead of sealant
- Cracked joints where brick meets render or frames
- Joints with sealant missing in places
How we handle external mastic in High Leigh
External mastic is a job where short cuts show quickly. Overfilled joints, missing backing rod and sealant laid over old sealant rarely last long. We strip the joint back and start again. If you’re dealing with water getting into walls through failed joints and failed seals between different materials, we can help, whatever the surface.
In a village or hamlet like High Leigh, older cottages and farm buildings often stand in the open, 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.
Your job is guaranteed for a year, as with all our work.
- Where
- High Leigh (EN11)
- Wider area
- Hertfordshire
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
How the job changes by surface
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. We reseal them with a low-modulus sealant over backing rod.
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.
What we do, step by step
We work through the job in order: protect, prepare, seal, tidy. Typically it takes anything from a few hours to several days, depending on the building. Somewhere like High Leigh needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- 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.
Preparing for the visit
- For indoor joints, keep the area dry beforehand if you can
- Let us know about stairs, lifts or work at height
- Mention any leaks or damp you’ve noticed
Get a quote
Need a quote? Please call 0345 464 0079 or send us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
Related advice
When something else is needed
New sealant can’t fix everything, and we’ll tell you before we start. It will not solve:
- Cracked brickwork or render that needs a builder or plasterer
- Cutting new joints into brickwork, which is building work rather than sealant work
- Structural movement, which needs a surveyor or engineer
If you’re not sure, just call 0345 464 0079 or email us and we’ll give you a straight answer before you book.
Where we work in High Leigh
- Façade panels
- Brickwork movement joints
- Concrete & block
- Copings & trims
- Render & cladding joints
- Joints between brick and frames
Walls and rooflines in High Leigh
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Managing a site like Westfield Community Primary School? Then larger buildings have long runs of movement joint that eventually need resealing. For landlords with property near Broxbourne station, split movement joints are easy to miss on a rental until damp shows inside. For an older house near a landmark such as Church of St Catherine & St Paul, older walls, gutters and the joints where extensions meet them need a flexible sealant.
High Leigh is about 1 mile north-west of Hoddesdon, in Hertfordshire. Jobs in High Leigh get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. High Leigh is one of 381 places in Hertfordshire where we work for external mastic. We also work in London, around 18 miles away.
We work across EN11 for external mastic and the streets around it. You will find streets such as Lord Street, Sedgwick Grove and Box Lane. We also cover Woollensbrook (1 mile north), Goose Green (1 mile west), Hoddesdon (1 mile south-east), Broxbourne (1 mile south) and Hailey (1 mile north). We also work in nearby towns such as Stevenage (12 miles north-west), St Albans (13 miles west), Bishop's Stortford (11 miles north-east), Welwyn Garden City (8 miles west), Harpenden (14 miles west) and Cheshunt (4 miles south).
Near you in High Leigh
We work in homes and buildings around Barclay Park, King William IV Public House and Robert Barclay Academy, among other places. The closest station to High Leigh is Broxbourne station, about 1.3 miles south-east. Other landmarks nearby include Lowewood Museum (0.8 miles south-east) and Hertford County Hospital (3.5 miles north-west). Not far away are Danemead and Cheshunt Lake.
Looking after it afterwards
So the new joints stay in good condition:
- Keep high-pressure jets off the joints
- Don’t let climbing plants root in the sealant
- Walk round the building once a year and look at the joints
- Check the sealant is paintable before painting near it
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They must stay as flexible joints, never rendered or pointed over.
A joint that has stopped moving pushes the movement elsewhere, normally as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
What affects the cost of external mastic
We don’t publish a price list, because no two jobs are the same. The quote depends on:
- The product the joint needs
- Any mould that needs treating
- When we can work, for business premises
- Whether old sealant or filler has to be cut out
Instead of a standard rate, we price the job in front of us: the amount of work, the old material and the access. The price is agreed before we begin.
What we need to know
Photos help, but a description is a good start. Please mention:
- Photos by email, if that is easy
- How we’d reach the joints
- What the problem is, such as mould, gaps, leaks or cracking
- Any previous sealing or DIY work
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.
Can I do it myself?
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Also near High Leigh
Also in High Leigh
FAQs for High Leigh
Do you work for landlords with property near Broxbourne station?
Yes. We work for letting agents and landlords as well as householders. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear quote.
Is High Leigh in your area for external mastic?
Yes, High Leigh is within the area we cover. We work across London and the South East. Just phone 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear price.
Do you take out the old sealant first?
Yes. All of the old material is cut out and the joint cleaned before resealing.
Do I have to be there?
If the work is inside, we need someone to let us in. Once we’ve agreed the job, you don’t need to watch us work.
What do you need from me for a quote?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
What is backing rod for?
Backing rod goes into deeper joints as a matter of course. It controls the depth and stops the sealant bonding to the back.
How often do external joints need resealing?
There’s no fixed answer: sunny, exposed elevations and busy joints wear faster. A yearly look will tell you when they need doing. Every job carries our one-year guarantee.
Do you work at height?
It depends on the height and the site. Ground-floor joints are simple; for higher ones, send details and we will confirm the access.
Leave it or put it right?
Mortar or ordinary filler might look like a quick way to close an open joint, but it stops the joint moving. The wall then cracks somewhere else. The correct repair is a flexible sealant with the right backing. Around High Leigh, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
What it costs depends on the amount of work, how much old material has to come out and how easy the joints are to reach. You will have a clear quote before any work starts, so you know where you stand.
What you get with us
- Approved under the ARBOMaster scheme
- 20+ years of sealant experience
- We leave the area clean and tidy
- Trusted Arbo and Everbuild sealants
Take a look at how sealant jobs are priced or customer reviews.