Hertfordshire · England
Bovingdon External Mastic
We cover Bovingdon for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly.
- Plants rooting in failed movement joints
- Sealant that has lost its bond to the brick or render
- Weathered mastic that no longer stretches
Aftercare tips
Looking after new joints is easy:
- Fix overflowing gutters above sealed joints
- Make sure movement joints are not pointed over
- Check external joints each spring
- Do not let climbing plants root in the sealant
Don’t paint over the new sealant unless we have said the product is paintable. Paint can crack on a flexible joint and spoil the finish.
A joint that has stopped moving pushes the movement elsewhere, generally as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
External mastic in Bovingdon, done properly
We’re ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Porous or awkward surfaces are primed where the sealant needs it, and we do not skip that step. We’re often asked to deal with sealant pulling away from one side of the joint and movement joints filled with mortar instead of sealant, across copings & trims, joints between brick and frames and render & cladding joints.
Houses in smaller places like Bovingdon can stand more in the open than those in a built-up town, so exposed walls and rooflines take more wind-driven rain. That is where gutter joints and wall joints tend to fail first.
There’s a 12-month guarantee on every job, whatever its size.
- Place
- Bovingdon (HP3)
- Wider area
- Hertfordshire
- Cover
- One year on every job
- Quote
- A clear price before work begins
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Walls and rooflines in Bovingdon
Historic houses like Chenies Manor House (about 3.2 miles south) are a reminder that the area around Bovingdon has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you live in an older home near Church of St Lawrence, older walls, gutters and the joints where extensions meet them need a flexible sealant. If you let a flat or house near Hemel Hempstead station, split movement joints are easy to miss on a rental until damp shows inside.
Bovingdon is about 3 miles south-east of Berkhamsted, in Hertfordshire. Homes, rented property, offices and hotels in Bovingdon is covered for external mastic. Every job comes with our one-year guarantee. Bovingdon is one of 381 towns and villages in Hertfordshire where we work for external mastic. London is on our list too, around 24 miles away.
Work in HP3 is quoted and booked the same way as anywhere else. If you need external mastic at a property on High Street, Old Dean and Hyde Meadows or a nearby road, we can help. If you’re just outside Bovingdon, we cover Bulstrode (1 mile east), Hogpits Bottom (1 mile south), Orchard Leigh (2 miles west), Tower Hill (2 miles south-east) and Ley Hill (2 miles south-west). Within a short drive, we also cover Watford (7 miles south-east), Hemel Hempstead (4 miles north-east), St Albans (9 miles east), Harpenden (10 miles north-east), Hatfield (13 miles east) and Borehamwood (12 miles east).
Local landmarks in Bovingdon
In Bovingdon, that means homes and buildings near The Wheatsheaf Public House. For rail, the closest station is Hemel Hempstead station, roughly 2.4 miles north-east. Nearby you will also find Hemel Hempstead Hospital (3.5 miles north-east) and Hawridge Court (4.1 miles west). Open spaces near Bovingdon include Sarratt Bottom nature reserve.
Different surfaces, different methods
Brickwork movement joints
Brick movement joints are often mistaken for a missing mortar line. Where one has been mortared, we cut it out and reseal it with sealant where it can be done safely.
Joints between dissimilar materials
Each side of the joint may need its own preparation. Both surfaces are cleaned and primed as the product requires.
FAQs for Bovingdon
Do you work for landlords with property near Hemel Hempstead station?
Yes. We work for landlords and letting agents as well as householders. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear price.
Will you come out to Bovingdon?
Yes. Bovingdon is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do I need to be at home?
That depends on where the joints are. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
Can you seal over the old sealant?
No. The old sealant always comes out first, so the new joint bonds to clean surfaces.
What is a movement joint?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It’s sealed with a flexible sealant, not mortar.
Will there be a smell?
Sometimes, a little. Any smell clears as the sealant cures.
What do you need from me for a quote?
The location, the problem and the rough size of the job. If you can, email a few photos.
Where do you work from?
Our base is in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
Landlord and commercial work in Bovingdon
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. Several properties can go on one quote.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Why act early in Bovingdon
An open joint keeps letting water into the wall with every downpour. Wet masonry is more easily damaged by frost around the joint, so the problem grows beyond the joint itself. Around Bovingdon, water from a failed joint in an older home can soak into timber and plaster, which is far harder to put right than the sealant itself.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, plus any working-time requirements on site. Ask us for a quote and we’ll explain what it covers.
What you get with us
- Every job guaranteed for a year
- An ARBOMaster approved applicator
- We never seal over old sealant
- White, clear, grey or coloured to suit, where the product allows
See how sealant jobs are priced and our reviews.
How it works
Most of a good job is in the preparation, so that is where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it generally takes a few hours to a few days, depending on the length of joint and the access. For a job in Bovingdon, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Getting ready for the visit
- Tell us if parking is tricky
- Keep pets and children clear of the area while we work
- Tell us about any water getting in
Ask for a quote
To get a quote, phone 0345 464 0079 or drop us an email with the location and a short description of the problem. We’ll give you a clear quote before any work starts.
Advice
Can I do it myself?
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Common problems we fix in Bovingdon
Many joints fail because they were sealed too deep or with nothing behind them. If the sealant sticks to the back as well as the sides, it cannot stretch and tears as soon as the joint widens.
Any of these means the joints need attention:
- Rain getting behind render or cladding at a joint
- Joints pointed up with cement by mistake
- Joints with sealant missing in places
- Joints where the bead has come unstuck
For site and facilities teams at buildings such as Bovingdon Primary Academy, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Before booking anyone
- Whether all the old sealant comes out first
- Which colour the sealant will be
- How hidden problems are handled
- Whether the sealant suits the joint