Hertfordshire · England
Bengeo External Mastic
External mastic across Bengeo and nearby, with old sealant always removed completely and a 12-month guarantee.
- Old sealant gone brittle and cracked
- Plants rooting in failed movement joints
- Leaking joints around cladding and façade panels
Bengeo: your questions answered
Can you help a landlord with a rental near Hertford East station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can call 0345 464 0079 or send us an email with the details for a clear quote.
Do you cover Bengeo for external mastic?
Yes, Bengeo is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or email us with a few details of the job, and we will give you a clear price.
Will you leave a mess?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
What do you need from me for a quote?
Where the job is, what the problem is and roughly how big it is. If you can, email a few pictures.
How often do external joints need resealing?
It varies from wall to wall: sunny, exposed elevations and busy joints wear faster. Check them each year and reseal when they split or harden. Our work comes with a one-year guarantee.
Can I do it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
Where do you work from?
Our base is in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
How long before the joint can be used?
Many sealants skin over quickly but take longer to cure fully. We will give you the cure time for the product we used.
About our external mastic in Bengeo
Low-level joints can usually be done from the ground. For joints higher up, give us some details of the building and we will confirm what access is needed. If you’re dealing with failed sealant between panels on a façade and movement joints with cracked, split or missing sealant, we can put it right, whatever the surface.
Homes around Bengeo range from older cottages to newer houses, with walls and rooflines of every type. Older homes need their gutter and trim joints kept tight, newer ones their movement joints.
Each job carries a 12-month guarantee.
- Location
- Bengeo (SG14, SG13, SG12)
- Wider area
- Hertfordshire
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Why act early in Bengeo
A failed movement joint lets water into the wall. Resealing early keeps the job to the joint itself, rather than the wall around it. In an older home around Bengeo, damp from a failed joint can get into timber and plaster, which is far harder to put right than the sealant itself.
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all make a difference, and we’ll explain the quote if you ask.
What you get with us
- Trusted Arbo and Everbuild sealants
- Every job guaranteed for a year
- Any old sealant cut out fully, not covered over
- Anti-fungal sanitary silicone in wet areas
Looking after it afterwards
After the cure time, these simple habits help:
- Keep soil, plants and ivy away from the joints
- Keep movement joints as flexible joints, not mortar
- Avoid pressure-washing directly into sealant joints
- Fix overflowing gutters above sealed joints
Have a quick look at the joints each spring. Splits, gaps at the edges or plants in the joint are early warning signs.
An open movement joint lets rain into the wall every time it pours. Over time it can mean damp inside, stained render or frost-damaged brick.
How it works
The work is kept neat and contained to the joints we are treating. The job generally takes a few hours for a handful of joints, longer for a whole elevation, and we explain the cure time before we leave. For a job in Bengeo, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
How to prepare
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us about any water getting in
- Tell us if parking is tricky
Getting a quote
To get a quote, ring 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. We’ll send you a clear quote before any work starts.
Related advice
What we’re called out for in Bengeo
Some movement joints have been pointed up with mortar, often by someone who didn’t know what it was for. The joint cannot move, so the wall cracks somewhere else instead.
Any of these means the joints need attention:
- Moss and dirt in joints with no sealant left
- Water getting into walls through failed joints
- Movement joints filled with mortar instead of sealant
- Weathered mastic that no longer stretches
Letting a property close to Hertford East station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
What to look for in a quote
- What product goes in the joint
- How hidden problems are handled
- Who turns up on the day
- Whether they’re fully insured
Quotes for external mastic in Bengeo
There’s no set price list, because jobs vary so much. What we look at:
- Any working-time requirements on site
- The number and length of the joints
- The type of sealant required
- Whether old sealant or filler has to be cut out
Combining jobs into one visit usually makes better use of the time than several visits, so tell us about everything that needs sealing. We will send you a clear quote for the lot.
Helping us quote
Photos help, but a description is a good start. Please mention:
- Where the property is
- Whether it has been sealed before
- The rough size of the job
- How we’d reach the joints
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. Whenever you’re ready, phone 0345 464 0079 or drop us an email.
Should I try it myself first?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
When something else is needed
We will always be straight with you, so here’s what new sealant will not do:
- Adding movement joints to masonry that has none
- Cracking across the wall rather than at a joint
- Damp that is not coming from the joint
If in doubt, phone 0345 464 0079 or drop us an email and we’ll say what we think before you book.
What we seal
- Joints between brick and frames
- Render & cladding joints
- Brickwork movement joints
- Concrete & block
- Copings & trims
- Façade panels
What external mastic looks like in Bengeo
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you look after a building such as Mill Mead Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. For an older house near a landmark such as Church of Saint Leonard, an extension built onto an older house moves differently, and the joint between them takes the strain.
Bengeo is about 1 mile north of Hertford, in Hertfordshire. We carry out external mastic for homeowners, landlords and businesses in Bengeo. Bengeo is one of 381 towns and villages in Hertfordshire where we work for external mastic. We also work in London, about 21 miles from Bengeo.
All of SG14, SG13 and SG12 is covered for external mastic. If you need external mastic at a property on New Road, Mill Road and The Avenue or anywhere close by, we can help. Nearby, we also carry out external mastic in Waterford (1 mile north-west), Chapmore End (2 miles north), Ware (2 miles east), Tonwell (2 miles north) and Thundridge (3 miles north-east). Larger places within reach include Stevenage (8 miles north-west), St Albans (11 miles west), Bishop's Stortford (11 miles north-east), Welwyn Garden City (5 miles west), Harpenden (12 miles west) and Hitchin (13 miles north-west).
What’s near Bengeo
Around Bengeo, our work takes us to homes and buildings near Richard Hale School and White Lion pub. There’s a railway station in Bengeo itself: Hertford East station. A little further out are Hertford Castle (0.6 miles south) and Hertford County Hospital (0.7 miles south-west). Green spaces nearby include Willowmead.