Hertfordshire · England
External & façade joints in Kimpton, Hertfordshire
Our applicators work in Kimpton on sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly.
- Plants rooting in failed movement joints
- Movement joints filled with mortar instead of sealant
- Water getting into walls through failed joints
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. A few tips:
- Leave the joints unpainted unless we have said otherwise
- Make sure movement joints are not pointed over
- Keep high-pressure jets off the joints
- Tell anyone working on the walls about the movement joints
Avoid pressure-washing straight into the joints. High-pressure water can lift the edges.
Once a joint cannot move, the wall finds another way, generally as cracking in the brickwork or render nearby. Catch it early and you reduce the risk.
External mastic for homes and businesses in Kimpton
A movement joint is a deliberate break that lets a wall expand and contract. Its sealant has to flex with the building, season after season, and when it fails, the wall takes the strain and water finds a way in. Typical jobs include joints pointed up with cement by mistake and movement joints with cracked, split or missing sealant, on brickwork movement joints, copings & trims and render & cladding joints.
Older homes in small places like Kimpton may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water generally gets in.
All our work comes with our 12-month guarantee, wherever you are in Hertfordshire.
- Where
- Kimpton (SG4)
- Region
- Hertfordshire
- Cover
- 12 months on all our work
- Quotes
- A clear price before we start
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
DIY sealant or a professional job?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Also near Kimpton
More services for Kimpton
Signs you need external mastic in Kimpton
If plants are growing out of a joint, the sealant has normally failed or was never there. Roots and dirt hold water against the wall and make things worse.
These are the problems we’re asked about most:
- Plants rooting in failed movement joints
- Failed sealant between panels on a façade
- Joints with sealant missing in places
- Water getting into walls through failed joints
Letting a property close to Harpenden station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
Questions to ask before booking
- What product goes in the joint
- How long the guarantee is
- Whether all the old sealant comes out first
- Which colour the sealant will be
How the job changes by surface
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. The old joint is removed and a sealant that bonds to both sides goes in.
Cladding and façade panels
If the façade has a specified sealant, that is what we use or an approved alternative. Tell us what the building has when you get in touch.
Questions from Kimpton
Do you cover smaller places like Kimpton?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can you help a landlord with a rental near Harpenden station?
Yes, we work for landlords and agents. Just ring 0345 464 0079 or email us and tell us about the property, and we’ll send you a clear quote.
Should I point up the gap in my brickwork?
No. Rigid materials can’t move with the wall. Where a joint has been mortared, it can often be raked out and sealed properly.
What information do you need?
Only a few details: where it is, what you’ve noticed and how we reach it. After that, simply ring 0345 464 0079 or drop us an email.
Is it messy?
We keep the work tidy. We protect what’s around the joints.
What do you put in the joint?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice.
Are you an approved applicator?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
Is the work guaranteed?
Yes: twelve months. If there’s a problem with our work in that time, tell us and we’ll put it right.
What happens if it’s left?
Sealing over the top of old mastic doesn’t hold for long. The new layer can’t bond properly to old, weathered material, so we always take the old sealant out. Around Kimpton, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
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.
Why us?
- Old sealant always removed completely
- Sanitary silicone with an anti-fungal additive in wet areas
- 180+ five-star Google reviews
- Fully insured
Read how sealant jobs are priced or our reviews.
What we do, step by step
At the end, we look at the finished work together and explain the cure time. The visit itself generally takes anything from a few hours to several days, depending on the building, depending on the size of the job. For a village or hamlet like Kimpton, 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.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
Getting ready for the visit
- For indoor joints, keep the area dry beforehand if you can
- Tell us about any previous sealing or DIY attempts
- Mention any parking rules near the property
Get a quote
Call for a quick quote, or email us if that’s easier. Describe what needs sealing and we will talk you through the work before giving you a price.
Read more
Outside joints around Kimpton
With historic houses such as Shaw's Corner (about 1.8 miles south-east) nearby, there’s older building stock in the area around Kimpton as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Managing a site like Kimpton Primary School? Then its movement joints, gutters and trims need looking after like any other building’s. Homes close to Parish Church of St Peter and St Paul include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Kimpton is about 3 miles north-east of Harpenden, in Hertfordshire. Whether you’re in the middle of Kimpton or further out, external mastic is available for homes and businesses alike. Our area takes in 381 places across Hertfordshire. London is on our list too, about 26 miles from Kimpton.
All of SG4 is covered for external mastic, from the main roads to the quietest streets. That includes homes and businesses on High Street, Hampden and Wheelwrights. Close by, we work in Gustard Wood (2 miles south), Whitwell (2 miles north), Ayot St Lawrence (2 miles south-east), Codicote Bottom (2 miles east) and Codicote (3 miles east). We also work in nearby towns such as Watford (14 miles south), Hemel Hempstead (10 miles south-west), Stevenage (6 miles north-east), St Albans (7 miles south), Welwyn Garden City (6 miles south-east) and Harpenden (3 miles south-west).
Around Kimpton
Locally, jobs take us to homes and businesses close to The Boot pub and the streets around them. The closest station to Kimpton is Harpenden station, about 3.4 miles south-west of the centre. Nearby you will also find Harpenden Museum (3.6 miles south-west). Not far away are Stocking Springs Wood.
Work for landlords, hotels and businesses
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Letting agents often deal with us directly. Tell us the address, the job and how access works and we’ll give you a quote.