East Sussex · England
Herstmonceux External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Herstmonceux and across East Sussex. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Gaps where render, brick and frames meet
- Joints pointed up with cement by mistake
- Moss and dirt in joints with no sealant left
External mastic in Herstmonceux
A movement joint is only as good as its depth. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, leaving it bonded to two faces so it can move with the wall. Common call-outs are for hard, crazed mastic that has stopped moving and joints pointed up with cement by mistake, across brickwork movement joints, façade panels and concrete & block.
Outside joints can only be sealed when they’re dry, so work in Herstmonceux is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
The work is covered for a year after we finish. If there’s a problem with it, please call 0345 464 0079 or drop us an email.
- Place
- Herstmonceux (BN27)
- Wider area
- East Sussex
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Why deal with it now?
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That protects surfaces like brick, render and concrete. Too stiff a sealant can pull at the edges and break them. Where a wall is exposed, as many are in small places like Herstmonceux, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
What you get with us
- White, clear, grey or coloured to suit, where the product allows
- Approved under the ARBOMaster scheme
- 20+ years of sealant experience
- Anti-fungal silicone where joints get wet
Read what affects the cost or what customers say.
Places near Herstmonceux
Also in Herstmonceux
Walls and rooflines in Herstmonceux
Historic houses like Horselunges Manor (about 3.1 miles west) are a reminder that the area around Herstmonceux has older buildings as well as new. Where a home is older, 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.
Managing a site like Herstmonceux Church of England Primary School? Then larger buildings have long runs of movement joint that eventually need resealing.
Herstmonceux is about 3 miles north-east of Hailsham, in East Sussex. We provide external mastic to homes and businesses in Herstmonceux and nearby, as part of our work across East Sussex. Herstmonceux is one of 289 towns and villages in East Sussex where we work. For nearby work, see our Brighton page, about 20 miles away.
All of BN27 is covered for external mastic. We cover properties on Fairlawns Drive, Dacre Road and Fiennes Road and the roads around them. Neighbouring places we cover for external mastic include Chapel Row (1 mile south-east), Stunts Green (1 mile north-west), Flowers Green (1 mile south), Windmill Hill (1 mile east) and Golden Cross (1 mile south). Further out, we also cover Eastbourne (7 miles south), Hastings (11 miles east), Bexhill-on-Sea (7 miles south-east), Seaford (12 miles south-west), Lewes (14 miles west) and Hailsham (3 miles south-west).
Near you in Herstmonceux
In Herstmonceux, that means homes and buildings near Woolpack Inn, among other places. A little further out are Amberstone Hospital (2 miles west) and Herstmonceux Castle (1.6 miles south-east).
Common problems we fix in Herstmonceux
If plants are growing out of a joint, the sealant has normally failed or was never there. Dirt and roots then trap moisture in the joint and speed up the damage.
Keep an eye out for these signs:
- Weathered mastic that no longer stretches
- Movement joints filled with mortar instead of sealant
- Panel joints letting water in
- Weeds or debris growing in open joints
Historic houses such as Horselunges Manor, about 3.1 miles west, show how far back building around Herstmonceux goes, and older homes nearby need a sealant that suits their walls.
Comparing quotes
- What guarantee comes with the work
- Is the old sealant removed completely?
- Who does the work, and how experienced they are
- How the colour is chosen
Honest limits
A few problems are outside what sealant work can do:
- Subsidence or other structural problems
- Cracks in the bricks or render themselves, away from the joints
- Render that’s blown, hollow or coming away
If in doubt, ring 0345 464 0079 or email us and we will say what we think before booking.
Joints and surfaces we work on
- Concrete & block
- Render & cladding joints
- Brickwork movement joints
- Joints between brick and frames
- Copings & trims
- Façade panels
How the visit works
We keep the work tidy and contained to the area we’re working on, so you can carry on as normal. Expect the work to take a few hours for a handful of joints, longer for a whole elevation. Somewhere as small as Herstmonceux, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
How to prepare
- Tell us about any water getting in
- Keep children and pets away from the work area
- Mention any parking rules near the property
How to get a quote
We quote each job on its own, so start by telling us what you need. Just phone 0345 464 0079 or email us with the details, and photos are welcome.
Read more
How the job changes by surface
Cladding and façade panels
Cladding and façade panels are normally separated by sealed joints. We reseal them with a sealant suited to the panel material.
Concrete and blockwork
Blockwork and concrete shrink over time and move with the seasons. Their movement joints are sealed over backing rod with a flexible sealant.
Your questions about external mastic in Herstmonceux
Will you come out to Herstmonceux?
Yes. Herstmonceux is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you cover Herstmonceux for external mastic?
Yes, Herstmonceux is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or email us and tell us what needs doing, and we will give you a clear quote.
How long before the joint can be used?
It depends on the product. Before we leave, we will tell you the cure time.
Should I point up the gap in my brickwork?
No. Cement or mortar cannot stretch. If it has already been filled, we can normally cut it out and reseal it.
How long does the job take?
It depends on the size of the job, but most jobs take anything from a few hours to several days, depending on the building. We’ll give you a better idea when we quote.
What information do you need?
Where the job is, what the problem is and roughly how big it is. If you can, email a few pictures.
Do you remove the old sealant?
Yes, every time. New sealant will not bond properly to old, so any old material comes out before anything new goes in.
What do you put in the joint?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
Keeping the joints in good condition
After the cure time, these simple habits help:
- Look over the joints every year, ideally after winter
- Check the sealant is paintable before painting near it
- Make sure movement joints are not pointed over
- Do not let climbing plants root in the sealant
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.
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.
What affects the quote in Herstmonceux
There’s no set price list, because jobs vary so much. The quote depends on:
- How many areas need sealing
- How easy the joints are to reach
- Whether old sealant or filler has to be cut out
- Working hours on commercial sites
What you pay reflects the work, not a rough estimate. That’s why we ask a few questions first and send you a clear quote before any work starts.
What we need to know
To help us quote quickly, please include:
- How we’d reach the joints
- The rough size of the job
- The type of property
- The address or postcode of the job
If you’re in Herstmonceux and need external mastic, call 0345 464 0079 or send us an email. Tell us what the problem is and where, and you’ll get a clear quote before any work starts.