Hertfordshire · England
Wheathampstead External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for homeowners, landlords and businesses in Wheathampstead. Fully insured, ARBOMaster approved and guaranteed for a year.
- Movement joints with cracked, split or missing sealant
- Weeds or debris growing in open joints
- Cracked joints where brick meets render or frames
How we handle external mastic in Wheathampstead
Movement joints let brickwork, render and cladding expand and shrink without cracking. Its sealant has to flex with the building, season after season, so once it splits or hardens, the joint stops working and water gets in. Typical jobs include cracked joints where brick meets render or frames and hard, crazed mastic that has stopped moving, on render & cladding joints, joints between brick and frames and copings & trims.
Outbuildings, garages and conservatories around homes in places like Wheathampstead add more joints to look after. Leaks normally start at a gutter end, a garage door frame or where an extension meets the house.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Place
- Wheathampstead (AL4)
- Region
- Hertfordshire
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Common problems we fix in Wheathampstead
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.
It’s worth asking for a quote if you see:
- Movement joints with cracked, split or missing sealant
- Hard, crazed mastic that has stopped moving
- Plants rooting in failed movement joints
- Joints pointed up with cement by mistake
Schools such as St Helen's Church of England Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
Questions to ask before booking
- Which colour the sealant will be
- When the joint can take water or movement
- How long the guarantee is
- What happens if the job turns out different
Places near Wheathampstead
More services for Wheathampstead
Can I do it myself?
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.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
What sealant work cannot fix
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- Movement that is more than a sealant joint can take
- Cracks in the bricks or render themselves, away from the joints
- Rising or penetrating damp from elsewhere in the wall
If in doubt, call 0345 464 0079 or send us an email and we will say what we think.
Where we work in Wheathampstead
- Concrete & block
- Façade panels
- Joints between brick and frames
- Copings & trims
- Render & cladding joints
- Brickwork movement joints
What affects the quote in Wheathampstead
Jobs vary more than people expect. What affects the quote:
- The product the joint needs
- The old material and how stubborn it is
- How many rooms, windows or areas are involved
- The size of the job
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs. Ask us for a quote and we will go through it with you.
What we need to know
What to tell us when you ask for a quote:
- Any previous sealing or DIY work
- What the problem is, such as mould, gaps, leaks or cracking
- The rough size of the job
- The type of property
Want a quote for external mastic? Please call 0345 464 0079 or drop us an email and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
Keeping the joints in good condition
Aftercare is simple:
- Keep water from gutters off the wall
- Get split or bare joints resealed while the damage is small
- Leave the joints unpainted unless we’ve said otherwise
- Avoid pressure-washing directly into sealant joints
Give the sealant the cure time we tell you before anything rubs against it. Most exterior sealants skin fast but take longer to cure right through.
A joint that has stopped moving pushes the movement elsewhere, generally as cracking in the brickwork or render nearby. Catch it early and you reduce the risk.
The process
We keep the work tidy and contained to the joints we’re treating, so you can get on with your day. Expect the work to take a few hours for a handful of joints, longer for a whole elevation, and we explain the cure time before we leave. Parking around Wheathampstead is usually easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- First we look over the joints with you, agree which to renew and talk through access.
- 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.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Getting ready for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Clear items away from the joints we are working on
- Let us know about parking restrictions
Getting a quote
To get 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
What happens if it’s left?
An open joint keeps letting water into the wall with every downpour. In cold weather, frost can damage wet brick and render around the joint, so the problem grows beyond the joint itself. Around Wheathampstead, water from a failed joint in an older home can soak into timber and plaster, and that is a much bigger job than renewing the sealant.
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. The price is agreed before we begin.
Why us?
- More than 20 years in sealant work
- Domestic, commercial and hotel work
- Any old sealant cut out fully, not covered over
- An ARBOMaster approved applicator
Read what affects the cost or customer reviews.
Wheathampstead buildings and the weather
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Shaw's Corner (about 1.9 miles north-east) are a reminder that the area around Wheathampstead has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
For landlords with property near Harpenden station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. In the older streets around St Helen's Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
Wheathampstead is about 2 miles east of Harpenden, in Hertfordshire. Every kind of property in Wheathampstead is covered for external mastic. The work is guaranteed for a year. Wheathampstead is one of 381 places in Hertfordshire where we work. We also work in London, around 23 miles away.
Postcode districts we cover here for external mastic: AL4. Whether your property is on High Street, Station Road and St Thomas Place or anywhere close by, we can help. Other places close to Wheathampstead include Gustard Wood (1 mile north), Ayot St Lawrence (2 miles north-east), Ayot St Peter (2 miles east), Ayot Green (3 miles east) and Kimpton (3 miles north). Within a short drive, we also cover Watford (11 miles south-west), Hemel Hempstead (8 miles south-west), Stevenage (8 miles north-east), St Albans (4 miles south), Welwyn Garden City (4 miles east) and Hitchin (10 miles north).
Landmarks near Wheathampstead
Typical jobs here are in homes near The Swan Public House and Sir John Lawes School. The closest station to Wheathampstead is Harpenden station, about 2.5 miles west. Nearby you’ll also find Howard Centre (3.8 miles east) and St Albans City Hospital (4.1 miles south-west). Not far away are Wheathampstead Local Nature Reserve and Verulamium Lake.
Questions from Wheathampstead
Is Wheathampstead in your area for external mastic?
Yes, Wheathampstead is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or email us and tell us what needs doing, and we will give you a clear quote.
Do you cover smaller places like Wheathampstead?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Do you work for landlords and businesses?
Yes. We work for homeowners, landlords, letting agents, businesses and hotels across Hertfordshire.
What should I tell you?
A short description and the location. We will ask anything else we need to know.
Do you do commercial work?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. Working times can be discussed when we quote.
Is the work guaranteed?
Yes, always. There’s a 12-month guarantee on every job, wherever you are.
Should I try DIY first?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
Are you ARBOMaster approved?
Yes. We hold ARBOMaster approved applicator status.