Hertfordshire · England
External & façade joints in Hertingfordbury, Hertfordshire
External mastic for Hertingfordbury and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Sealant that has lost its bond to the brick or render
- Failed seals between different materials
- Joints with sealant missing in places
FAQs for Hertingfordbury
I let a flat near Hertford North station. Can you help?
Yes. We work for letting agents and landlords as well as householders. You can phone 0345 464 0079 or send us an email with the details for a clear quote.
Do you cover Hertingfordbury for external mastic?
Yes, Hertingfordbury is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear quote.
What is a movement joint?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It should be filled with flexible sealant, never mortar.
Can you match the colour of my brickwork?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We choose the closest to your brick or render so it does not stand out.
Do you do commercial work?
Yes, regularly. We can plan bigger jobs in stages to suit the site.
Is it OK to fill a movement joint with cement?
No, not if it’s a movement joint. Pointing it stops it working. We will reseal it with a flexible sealant.
Why do you put foam in the joint first?
The foam is closed-cell backing rod. It keeps the sealant at the right depth and bonded to the sides only.
What sealant do you use?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference.
External mastic for homes and businesses in Hertingfordbury
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible exterior sealant takes up that movement. Typical jobs include weathered mastic that no longer stretches and failed seals between different materials, across concrete & block, brickwork movement joints and façade panels.
Around Hertingfordbury, older buildings can be stone, brick or timber-framed, many with extensions added later. The joints where those materials meet are the weak points, and they need the right sealant at the right depth.
We stand behind the work with a one-year guarantee, so you’re covered after we have gone.
- Location
- Hertingfordbury (SG14)
- Region
- Hertfordshire
- Cover
- A year, on every job
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Outside joints around Hertingfordbury
Historic houses like Digswell House (about 4.6 miles north-west) are a reminder that the area around Hertingfordbury has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For landlords with property near Hertford North station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. Schools such as Hollybush Primary School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s.
Hertingfordbury is about 1 mile south-west of Hertford, in Hertfordshire. Wherever you are in the SG14 postcode area, our applicators can take on external mastic. 381 places in Hertfordshire are on our list. For nearby work, see our London page (20 miles or so).
Our applicators cover all of SG14 for external mastic and the streets around it. That includes homes and businesses on White Horse Close, Hertingfordbury Road and St Mary's Lane and the roads around them. Nearby, we also carry out external mastic in Staines Green (1 mile west), East End Green (1 mile south-west), Letty Green (1 mile south-west), Bayford (2 miles south) and Little Berkhamsted (3 miles south). Larger places within reach include Watford (15 miles south-west), Hemel Hempstead (15 miles west), Stevenage (9 miles north), St Albans (10 miles west), Bishop's Stortford (12 miles north-east) and Welwyn Garden City (4 miles west).
What’s near Hertingfordbury
In Hertingfordbury, that means homes and buildings near The Sele School, White Horse Inn and Panshanger Park and the streets around them. Hertingfordbury’s nearest station is Hertford North station, roughly 0.8 miles north-east. A little further out are Mcmullen & Sons Brewery Museum (1.2 miles east) and Hertford Castle (1.1 miles east). Not far away are Willowmead.
Keeping the joints in good condition
Aftercare is simple, and it makes a real difference:
- Keep water from gutters off the wall
- Tell anyone working on the walls about the movement joints
- Get split or bare joints resealed while the damage is small
- Check external joints each spring
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.
Small splits are the time to act. At that stage it’s a simple cut out and reseal.
The process
Good joint work is mostly preparation, and we do not rush it. Joints are cleaned back and dried before anything new goes in. All told, the work takes anything from a few hours to several days, depending on the building. For a village or hamlet like Hertingfordbury, 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 inspect the joints and agree which need resealing and how they’ll be reached.
- We cut out the failed sealant and rake out any dirt or growth.
- We clean both faces of the joint and prime them where the product calls for it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
How to prepare
- Clear the area around the work
- Keep pets and children clear of the area while we work
- Tell us about any previous sealing or DIY attempts
How to get a quote
Getting a quote is simple: let us know what needs doing and where. Photos by email help us understand the job, and we’ll come back to you with a quote.
Advice
Can I do it myself?
If you’ve already had a go yourself, that is fine. We cut it out and start again.
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.
Nearby places to Hertingfordbury
Also in Hertingfordbury
Leave it or put it right?
Water gets in through a failed movement joint. Dealing with it early keeps the repair to the joint, rather than the wall around it. In a small place like Hertingfordbury, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Combining jobs into one visit is usually more efficient than separate visits, so tell us about everything that needs sealing. You’ll get one clear quote for the whole job.
Why us?
- White, clear, grey or another colour, product permitting
- Neat joints and a tidy finish
- 12-month guarantee on every job
- Fully insured
What affects the cost of external mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- The number of rooms or windows
- Any working-time requirements on site
- The old material and how stubborn it is
- The product the joint needs
Leaving a failed joint generally makes the job bigger, not smaller. If you are not sure whether it needs doing, phone 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
Helping us quote
What to tell us when you ask for a quote:
- If someone has resealed it before
- Photos by email, if that is easy
- The problem you’ve noticed
- How we’d reach the joints
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. Whenever you’re ready, call 0345 464 0079 or drop us an email.
Landlords, agents and businesses in Hertingfordbury
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can be quoted together.
What we are called out for in Hertingfordbury
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.
People usually contact us when they notice something like this:
- Sealant that has lost its bond to the brick or render
- Weathered mastic that no longer stretches
- Joints with sealant missing in places
- Leaking joints around cladding and façade panels
For an older house near a landmark such as Church of St Mary and St John, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Questions to ask before you book
- Whether the sealant suits the joint
- How the colour is chosen
- The length of the guarantee
- Is the old sealant removed completely?