Hertfordshire · England
External & façade joints in Ashwell, Hertfordshire
Professional external mastic in and around Ashwell, with every bit of old sealant taken out first and a 12-month guarantee.
- Damp patches traced to an open external joint
- Rigid filler in a joint that should flex
- Weeds or debris growing in open joints
External mastic for homes and businesses in Ashwell
External mastic is a job where short cuts show quickly. Overfilled joints, missing backing rod and sealant laid over old sealant all tend to fail early. We take the old material out and do it properly. We work on façade panels, copings & trims and concrete & block, and people most often call us about failed sealant between panels on a façade and joints with sealant missing in places.
In a smaller place like Ashwell, some homes face open ground, so exposed walls and rooflines take more wind-driven rain. That’s where gutter joints and wall joints tend to fail first.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Where
- Ashwell (SG7)
- Wider area
- Hertfordshire
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
How the job changes by surface
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. They’re resealed over backing rod with a low-modulus sealant in a colour to suit the brick.
Joints between dissimilar materials
Each side of the joint may need its own preparation. We prepare both faces so the sealant bonds properly.
Towns and villages near Ashwell
More services for Ashwell
Aftercare tips
Aftercare is simple:
- Point out the joints to other trades
- Check the sealant is paintable before painting near it
- Walk round the building once a year and look at the joints
- Wash walls gently around the sealant
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.
Once a joint can’t move, the wall finds another way, usually as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
What happens on the day
You don’t need to clear the whole room or building, just the space around the work. We protect the rest, and the job takes a few hours for a handful of joints, longer for a whole elevation in most cases. In a smaller place like Ashwell, parking is seldom the issue; lanes, gates and long drives are worth mentioning. If the job is outside, tell us about side access and how high the joints are.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Getting ready for the visit
- Mention any parking rules near the property
- Mention any leaks or damp you’ve noticed
- Tell us about access, such as stairs, a lift or high-level joints
Ask for a quote
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. When it suits you, phone 0345 464 0079 or drop us an email.
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Should I try it myself first?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
For landlords and businesses
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
What external mastic looks like in Ashwell
With historic houses such as Hinxworth Place (about 1.8 miles west) nearby, there’s older building stock in the area around Ashwell as well as newer homes. In older buildings, 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.
If you look after a building such as Ashwell Primary School, its movement joints, gutters and trims need looking after like any other building’s. If you let a flat or house near Ashwell & Morden station, split movement joints are easy to miss on a rental until damp shows inside. If you live in an older home near St Mary's Church, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Ashwell is about 5 miles north-east of Letchworth, in Hertfordshire. Whether you’re in the middle of Ashwell or further out, we cover external mastic for every kind of property, from flats and houses to offices and hotels. Ashwell is one of 381 places in Hertfordshire we cover. There’s also a page for Chelmsford, roughly 34 miles from Ashwell.
Here we cover the SG7 postcode area for external mastic. We cover properties on High Street, Station Road and Alms Lane and the roads around them. We also cover Ashwell End (1 mile west), Bury End (2 miles west), Newnham (2 miles south-west), Caldecote (2 miles west) and Hinxworth (2 miles west). We also work in nearby towns such as Stevenage (9 miles south), Hitchin (8 miles south-west), Letchworth (5 miles south-west), Letchworth Garden City (5 miles south-west), Stotfold (4 miles south-west) and Baldock (4 miles south).
Around Ashwell
Typical jobs here are in homes near Rose And Crown Public House and the streets around them. The closest station to Ashwell is Ashwell & Morden station, roughly 2 miles east of the centre. Nearby you will also find Bygrave House (2.2 miles south) and Fairfield Hospital (4.8 miles south-west). For a walk, there’s Fox Covert.
What affects the cost of external mastic
Jobs vary more than people expect. The main factors:
- Any working-time requirements on site
- How much old sealant there is and how hard it is to remove
- The number of rooms or windows
- Access and height
Leaving a failed joint generally makes the job bigger, not smaller. If you are unsure, call 0345 464 0079 or email us and we’ll give you an honest view and a quote.
Asking for a quote
When you call or email, these details help:
- The address or postcode of the job
- Whether it’s a home or a business
- What’s wrong with the joints now
- Any previous sealing or DIY work
To get a quote, call 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You’ll have a clear quote before work begins.
Honest limits
Sealant isn’t the answer to every problem, and we’ll tell you before we start. It will not solve:
- Damp that is not coming from the joint
- Walls that need new movement joints cut into them
- Loose or hollow render, which needs re-rendering
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly.
Surfaces we seal
- Concrete & block
- Joints between brick and frames
- Façade panels
- Render & cladding joints
- Brickwork movement joints
- Copings & trims
Ashwell questions
Will you come out to Ashwell?
Yes, we do. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Is Ashwell in your area for external mastic?
Yes, Ashwell is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job.
How much does external mastic cost in Ashwell?
Size, access and the old material all affect the cost. Call for a quick quote and we’ll talk you through it.
How long will you be here?
A typical job takes a few hours for a handful of joints, longer for a whole elevation, including preparation and clearing up. We’ll confirm how long when we quote.
What do you need from me for a quote?
A short description and the location, plus pictures if you have them. If we need more, we’ll ask.
Why is there a gap in my brick wall?
It’s a deliberate gap that lets the wall expand and contract without cracking. It should be filled with flexible sealant, never mortar.
Do you have insurance?
Yes. Mr Mastic is fully insured.
Do you use backing rod?
We fit closed-cell backing rod wherever the joint depth needs controlling. It sets the sealant depth and prevents three-sided bonding, so the joint can move.