Hertfordshire · England
External Mastic in Hexton
External mastic for Hexton and the surrounding area: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Sealant that has lost its bond to the brick or render
- Hard, crazed mastic that has stopped moving
- Plants rooting in failed movement joints
External mastic in Hexton, done properly
We are ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Some surfaces need a primer before sealing, and we do not skip that step. If you have failed sealant between panels on a façade and joints pointed up with cement by mistake, we can put it right, whatever the surface.
Somewhere as small as Hexton, homes and farm buildings often face open ground, where walls and rooflines take the weather head on. Gutter joints and wall joints there need a sealant that can flex and stay put.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we’ll put it right.
- Where
- Hexton (SG5)
- Region
- Hertfordshire
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Landlords, agents and businesses in Hexton
We work for landlords and letting agents as well as homeowners. Sealant work between tenants keeps a property looking cared for.
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Nearby places to Hexton
Other services in Hexton
Different surfaces, different methods
Concrete and blockwork
Big joints in concrete need careful depth control. We size the backing rod to the gap and keep the sealant to the right depth.
Render joints
Water behind render can lead to blown patches. A sound joint keeps the render dry behind and helps it last.
What affects the cost of external mastic
We don’t publish a price list, because no two jobs are the same. What we look at:
- The old material and how stubborn it is
- Any working-time requirements on site
- Whether the work is at height
- Mould in or behind the old joints
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
What to tell us for a quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- If it’s domestic, commercial or a hotel
- Photos by email, if that is easy
- If someone has resealed it before
- Access, such as stairs, a lift or height
Quotes start with a quick conversation. Describe the problem, the location and the size of the job. When it suits you, phone 0345 464 0079 or email us.
Signs you need external mastic in Hexton
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, so it pulls away from the edges.
Common reasons people contact us are:
- Gaps where render, brick and frames meet
- Moss and dirt in joints with no sealant left
- Rain getting behind render or cladding at a joint
- Movement joints with cracked, split or missing sealant
In the older streets around Church of St Faith (Church of England), an extension built onto an older house moves differently, and the joint between them takes the strain.
Comparing quotes
- What the cure time is
- How hidden problems are handled
- Is the old sealant removed completely?
- Whether you can choose the colour
Questions from Hexton
Can you help a landlord with a rental near Harlington station?
Yes, we work for landlords and letting agents. You can ring 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before any work starts.
Do you cover smaller places like Hexton?
Yes. Hexton is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
How do you reach high-level joints?
It depends on the height and the site. Ground-floor joints are simple; for higher ones, send details and we will confirm the access.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
What is backing rod for?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. That way it bonds to the two sides only and can stretch.
What sealant do you use?
Each joint gets the product that suits it. Movement, water and weather all affect the choice, and we’ll tell you what we are using.
Can you seal joints between two different materials?
Yes. Where different materials meet is one of the most common joints we seal. We use a flexible sealant suited to both surfaces, primed where needed.
How long does external mastic last?
There’s no fixed answer: joints on exposed walls or with a lot of movement age sooner. A yearly look will tell you when they need doing. Our work comes with a 12-month guarantee.
What we do, step by step
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. Typically it takes anything from a few hours to several days, depending on the building, and the area is left clean. For a village or hamlet like Hexton, 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.
- First we look over the joints with you, agree which to renew and talk through access.
- The old mastic and anything lodged in the joint is removed.
- We clean both faces of the joint and prime them where the product calls for it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Getting ready for the visit
- Let us know about stairs, lifts or work at height
- For business premises, tell us about site rules or sign-in
- Tell us about any previous sealing or DIY attempts
Ask for a quote
Need a quote? Please phone 0345 464 0079 or send us an email and tell us about the job. We will explain what we’d do and send you a clear quote before any work starts.
Advice
Honest limits
Before booking, it’s worth knowing the limits:
- Walls that need new movement joints cut into them
- Failed render or damaged cladding panels
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we’ll tell you honestly.
Where we work in Hexton
- Concrete & block
- Copings & trims
- Render & cladding joints
- Joints between brick and frames
- Brickwork movement joints
- Façade panels
Aftercare tips
Aftercare is simple:
- Point out the joints to other trades
- Walk round the building once a year and look at the joints
- Leave the joints unpainted unless we have said otherwise
- Act on the first splits you see
Avoid pressure-washing straight into the joints. High-pressure water can lift the edges and let water in behind.
Water getting behind cladding or render can go unnoticed for a long time. When it finally shows inside, the joint may have been open for years so early resealing is worth it.
Outside joints around Hexton
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Harlington Manor (about 4.3 miles west) nearby, there’s older building stock in the area around Hexton as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
Schools such as Hexton Junior Mixed and Infant School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. For landlords with property near Harlington station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Hexton is in Hertfordshire. Jobs in Hexton get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Across Hertfordshire, we cover 381 places, Hexton among them. There’s also a page for London, roughly 34 miles from Hexton.
We cover every part of the SG5 postcode area for external mastic. We also cover the places around Hexton: Pegsdon (1 mile east), Apsley End (2 miles north-east), Hanscombe End (2 miles north), Shillington (3 miles north-east) and Pirton (3 miles east). Larger places within reach include Hemel Hempstead (15 miles south), Stevenage (10 miles south-east), St Albans (15 miles south), Welwyn Garden City (14 miles south-east), Harpenden (10 miles south) and Hitchin (5 miles east).
Local landmarks in Hexton
Typical jobs here are in homes near Recreation Ground and the streets around them. Hexton’s nearest station is Harlington station, roughly 4.5 miles west. A little further out are Ravensburgh Castle (0.9 miles south-west) and John Dony Field Centre (3.9 miles south). For a walk, there’s Butts Hill and Barton Gravel Pit.