Hertfordshire · England
External & façade joints in Highfield, Hertfordshire
Professional external mastic in and around Highfield, with every bit of old sealant taken out first and a one-year guarantee.
- Moss and dirt in joints with no sealant left
- Joints with sealant missing in places
- Failed sealant between panels on a façade
About our external mastic in Highfield
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. Typical jobs include panel joints letting water in and plants rooting in failed movement joints, across render & cladding joints, concrete & block and façade panels.
Homes around Highfield range from older cottages to newer houses, with walls and rooflines of every type. Older gutters and trims need their joints resealed; newer brick and render need their movement joints kept sound.
Big or small, you get the same 12-month guarantee.
- Place
- Highfield (HP2, HP1)
- Wider area
- Hertfordshire
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What we do, step by step
On the day, we look over the joints with you first, so you know exactly what we are doing. Surfaces next to the work are protected before any work begins. The work usually takes anything from a few hours to several days, depending on the building. In a smaller place like Highfield, parking is seldom the issue; lanes, gates and long drives are worth mentioning. For outside work, side access and the height of the joints help us plan.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- We cut out the failed sealant and rake out any dirt or growth.
- Both sides are cleaned back to sound material and primed if needed.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Before we arrive
- Tell us about any previous sealing or DIY attempts
- Mention any parking rules near the property
- Mention any tricky access
Get a quote
For a quote, phone 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You will have a clear quote before any work starts.
Advice
DIY versus a professional finish
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Landlord and commercial work in Highfield
For anyone letting property in or around Highfield, several properties can go on one quote. Just tell us the addresses and what each one needs, and photos by email help.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
When it is not the sealant
Before booking, it’s worth knowing the limits too:
- Rising or penetrating damp from elsewhere in the wall
- Adding movement joints to masonry that has none
- Cracking across the wall rather than at a joint
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly.
Where we work in Highfield
- Façade panels
- Joints between brick and frames
- Render & cladding joints
- Copings & trims
- Concrete & block
- Brickwork movement joints
Questions from Highfield
Can you help a landlord with a rental near Hemel Hempstead station?
Yes, landlords and agents are among the people we work for. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we will give you a clear quote.
Should the sealant in an older Highfield home be renewed?
In most cases, yes, if it hasn’t been done for a while. Sealant does not last for ever, and its life depends on use, cleaning and weather.
When is the sealant fully cured?
That depends on the sealant used, so please follow the time we give you.
Why is there a gap in my brick wall?
Most straight vertical gaps in brickwork are movement joints. It gives the wall room to move, and it should be sealed with a flexible sealant.
Will you leave a mess?
We keep the work tidy. Nearby surfaces are protected.
Where do you work from?
We’re a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
Can you reach joints on upper floors?
It depends on the building. Send us photos and a rough idea of the height and we’ll confirm how they can be reached safely.
Does someone need to be in?
We need access to the joints, so we will agree that with you when we book. Indoors, that usually means someone at home.
Different surfaces, different methods
Copings and trims
Copings expand and contract through the day, so a flexible sealant suits them best.
Cladding and façade panels
Cladding and façade panels are usually separated by sealed joints. Each joint gets a sealant that suits the panel and its movement.
Looking after it afterwards
A little care helps the new joints last. Our advice:
- Get split or bare joints resealed while the damage is small
- Keep soil, plants and ivy away from the joints
- Make sure movement joints are not pointed over
- Wash walls gently around the sealant
Avoid pressure-washing straight into the joints. A strong jet can damage the edges of the bead over time.
An open movement joint lets rain into the wall every time it pours. That can lead to damp patches, staining and frost damage which cost more to put right than the joint.
Do you need external mastic in Highfield?
If plants are growing out of a joint, the sealant has usually failed or was never there. Dirt and roots then trap moisture in the joint and make things worse.
The most common problems we see are:
- Weeds or debris growing in open joints
- Gaps where render, brick and frames meet
- Rigid filler in a joint that should flex
- Rain getting behind render or cladding at a joint
For landlords with property near Hemel Hempstead station, outside joints that have cracked can let damp into a rental, so check them between lets.
Questions to ask before booking
- Whether they’re fully insured
- What product goes in the joint
- Whether all the old sealant comes out first
- How much experience the applicator has
Places near Highfield
What else we do in Highfield
What external mastic looks like in Highfield
Hemel Hempstead, which Highfield is part of, is one of England’s post-war new towns. Homes here were built in phases, many of them in the post-war decades, so neighbouring houses often have rooflines and wall joints of the same age, wearing out at the same time. 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.
For an older house near a landmark such as St Paul's, an extension built onto an older house moves differently, and the joint between them takes the strain. Schools such as Yewtree Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
Highfield is about 1 mile north of Hemel Hempstead, in Hertfordshire. Jobs in Highfield get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. Across Hertfordshire, we cover 381 places, and Highfield is one of them. We also work in London, around 24 miles away.
Postcode districts we cover here for external mastic: HP2 and HP1. We cover properties on Juno Road, Great Road and Dione Road and the roads around them. Being close to the A4147, Highfield is simple for us to get to. We also cover Adeyfield (1 mile south-east), Hemel Hempstead (1 mile south), Piccotts End (1 mile north-west), Grovehill (1 mile south-west) and Woodhall Farm (1 mile south-west). We also work in nearby towns such as Watford (7 miles south), Stevenage (15 miles north-east), St Albans (6 miles east), Welwyn Garden City (12 miles east), Harpenden (6 miles north-east) and Hitchin (15 miles north-east).
Near you in Highfield
Typical jobs here are in homes near Gadebridge Park, The Old Bell pub and The Astley Cooper School. Highfield’s nearest station is Hemel Hempstead station, about 2.1 miles south-west of the centre. Other landmarks nearby include Redbourn Museum (3.3 miles north-east) and Hemel Hempstead Hospital (1.1 miles south-west). Open spaces near Highfield include Verulamium Lake and Long Deans.