Hertfordshire · England
Bendish External Mastic
Problem with your movement joints in Bendish? We remove the old material, prepare the joints and seal them properly.
- Water getting into walls through failed joints
- Movement joints filled with mortar instead of sealant
- Joints with sealant missing in places
External mastic for homes and businesses in Bendish
Short cuts in external joints show up within a season or two. Overfilled joints, missing backing rod and sealant laid over old sealant rarely last long. We take the old material out and do it properly. If you’re dealing with moss and dirt in joints with no sealant left and joints pointed up with cement by mistake, we can help, on render & cladding joints, brickwork movement joints and joints between brick and frames alike.
In a village or hamlet like Bendish, older cottages and farm buildings often stand in the open, where walls and rooflines take the weather head on. Joints on those walls need a sealant that moves with the building and stays in place.
Every job comes with a one-year guarantee.
- Where
- Bendish (SG4)
- Region
- Hertfordshire
- Guarantee
- 12 months on all our work
- Price
- A clear price before work begins
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
DIY sealant or a professional job?
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
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.
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Leave the joints unpainted unless we have said otherwise
- Act on the first splits you see
- Fix overflowing gutters above sealed joints
- Keep high-pressure jets off the joints
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They should be kept open and resealed, not filled.
Gaps, plants or missing sealant in a joint are worth getting looked at. Early work is quicker and leaves a better finish.
How we quote for external mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Whether old sealant or filler has to be cut out
- The number of rooms or windows
- How much there is to do
- How easy the joints are to reach
The cost depends on the size of the job, how hard the old material is to remove and access to the work. We give a clear quote before any work starts.
Asking for a quote
Before you ask for a quote, have a think about:
- Whether it has been sealed before
- Pictures of the joints, sent by email
- The problem you’ve noticed
- Where the property is
If you are in Bendish and need external mastic, call 0345 464 0079 or send us an email. Tell us what the problem is and where, and we will agree the price before any work begins.
How it works
Every visit runs the same way: we look at the joints together, protect the area around them, do the work and tidy away. Most jobs take a few hours to a few days, depending on the length of joint and the access. Somewhere like Bendish needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Preparing for the visit
- Let us know about stairs, lifts or work at height
- Move anything stored near the joints
- Tell us about any previous sealing or DIY attempts
Get a quote
Asking for a quote is easy: tell us what needs doing and where and its rough size. Photos by email help us understand the job.
Related advice
Work for landlords, hotels and businesses
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
Bendish questions
Will you come out to Bendish?
Yes. Bendish 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.
I let a flat near Luton Airport Parkway station. Can you help?
Yes, we work for landlords and agents. You can phone 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before we start.
Should I try DIY first?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
What is a movement joint?
Brickwork, render and cladding all move a little, and planned joints take up that movement. The gap is sealed with a flexible sealant over backing rod.
Can you seal joints between render and window frames?
Yes. Joints between dissimilar materials are a big part of external work. We use a flexible sealant suited to both surfaces.
Can you work on commercial sites?
Yes. We have worked for hotels, offices and other businesses and we are fully insured.
Can new sealant go over the old?
No, and we never do. It may look fine at first, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
Which products do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
When to call us in Bendish
A lot of failed joints come down to preparation: dusty or wet faces, no primer where one was needed, or old sealant left in. The sealant never bonds properly.
If you can see any of these, it’s time to have the joints looked at:
- Movement joints with cracked, split or missing sealant
- Sealant that has lost its bond to the brick or render
- Water getting into walls through failed joints
- Plants rooting in failed movement joints
Schools such as Breachwood Green Junior Mixed and Infant School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Before booking anyone
- Whether the sealant suits the joint
- What happens if the job turns out different
- Are they insured?
- How long to leave it before use
Outside joints around Bendish
With historic houses such as Shaw's Corner (about 3.7 miles south-east) nearby, there’s older building stock in the area around Bendish as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Rented homes near Luton Airport Parkway station change hands often, and split movement joints are easy to miss on a rental until damp shows inside. Historic houses such as Shaw's Corner, about 3.7 miles south-east, show how far back building around Bendish goes.
Bendish is about 5 miles north of Harpenden, in Hertfordshire. Bendish gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. 381 places in Hertfordshire are on our list, from the larger towns to small villages. You can also see our page for London, about 28 miles away.
Here we cover the SG4 postcode area for external mastic. If you are just outside Bendish, we cover Breachwood Green (1 mile north-west), King's Walden (1 mile north) and The Heath (1 mile north-west). Larger places within reach include Watford (15 miles south), Hemel Hempstead (11 miles south-west), Stevenage (6 miles east), St Albans (9 miles south), Welwyn Garden City (8 miles south-east) and Harpenden (5 miles south).
Near you in Bendish
In Bendish, that means homes and buildings near The Harrow Public House. For rail, the closest station is Luton Airport Parkway station, roughly 3.7 miles west. Nearby you will also find Luton Castle (4.6 miles west) and Lister Hospital (5.1 miles north-east). For a walk, there’s Stocking Springs Wood.
What sealant work cannot fix
Before you book, it’s worth knowing the limits too:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Walls that need new movement joints cut into them
- Cracks in the bricks or render themselves, away from the joints
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think.
What we seal
- Render & cladding joints
- Concrete & block
- Façade panels
- Brickwork movement joints
- Copings & trims
- Joints between brick and frames