Kent · England
Hersden External Mastic
External mastic for Hersden and the surrounding area: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Rigid filler in a joint that should flex
- Sealant pulling away from one side of the joint
- Weeds or debris growing in open joints
When to call us in Hersden
If plants are growing out of a joint, the sealant has usually failed or was never there. Dirt and roots then trap moisture in the joint and speed up the damage.
Common reasons people contact us are:
- Water getting into walls through failed joints
- Moss and dirt in joints with no sealant left
- Brick movement joints where the sealant has split
- Gaps where render, brick and frames meet
If you live in an older home near Church of All Saints, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Before booking anyone
- What happens if the job turns out different
- What preparation is included
- What guarantee comes with the work
- How the colour is chosen
How we handle external mastic in Hersden
Many failed façade joints only get noticed once there’s a stain or a damp patch inside. We look over the joints, agree the ones to renew and reseal with a flexible, weatherproof product in a matching colour. Common call-outs are for leaking joints around cladding and façade panels and joints with sealant missing in places, across concrete & block, brickwork movement joints and joints between brick and frames.
Homes around Hersden 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.
We stand behind the work with a one-year guarantee, so you are covered after we have gone.
- Place
- Hersden (CT3)
- Region
- Kent
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What the job involves on each surface
Concrete and blockwork
Big joints in concrete need careful depth control. We size the backing rod to the gap so the sealant isn’t too deep.
Copings and trims
A failed coping joint lets water into the top of the wall. Sealing them early saves the wall below.
What happens on the day
We bring everything the job needs with us, so you don’t need to buy or prepare anything. Once we have agreed what’s being done, we protect the area and start. It normally takes anything from a few hours to several days, depending on the building. Parking around Hersden is generally easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- Keep pets and children clear of the area while we work
- Tell us about any previous sealing or DIY attempts
- Clear the area around the work
Getting a quote
Want a quote for external mastic? Please call 0345 464 0079 or email us with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Advice
FAQs for Hersden
Can you help a landlord with a rental near Sturry station?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or email us and tell us about the property, and we will send you a clear quote.
Can you do external mastic in Hersden?
Yes, Hersden 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.
Can I do it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
Is it messy?
Tidy work is part of the job. Nearby surfaces are protected.
Can you reach joints on upper floors?
It depends on the building. We work on joints that can be reached safely. Give us some details and we’ll confirm the access.
Does someone need to be in?
That depends on where the joints are. Inside work needs someone to give us access.
Is it OK to fill a movement joint with cement?
No. A mortar-filled joint can’t move, so the wall cracks somewhere else instead. Use a flexible sealant with backing rod.
Can new sealant go over the old?
No. New silicone won’t bond to old silicone, and it traps any mould or water underneath. We remove it all first.
Places near Hersden
More services for Hersden
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. A few tips:
- Wash walls gently around the sealant
- Look over the joints every year, ideally after winter
- Tell anyone working on the walls about the movement joints
- Check the sealant is paintable before painting near it
Avoid pressure-washing straight into the joints. A strong jet can damage the edges of the bead over time.
If you can see gaps, plants or bare sections in a joint, have it checked. Earlier resealing means a smaller job and a better result.
Why act early in Hersden
Resealing a run of joints in one go is normally better than patching one at a time. Joints of the same age tend to fail together and it means sorting access once. In a smaller place like Hersden, wherever a wall is exposed, a failed outside joint is a real source of damp. Inside, a split seal lets water into floors and panels just as it would anywhere.
Doing several joints on one visit usually makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. You’ll get one clear quote for the whole job.
What you get with us
- ARBOMaster approved applicator
- A sealant colour to suit the surroundings
- Over 20 years’ experience
- A 12-month guarantee on all work
Read what affects the cost or what customers say.
Outside joints around Hersden
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you let a flat or house near Sturry station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. Managing a site like Hersden Village Primary School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Hersden is about 4 miles south of Herne Bay, in Kent. Hersden gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. 922 places in Kent are on our list, large and small. There’s also a page for Chelmsford, roughly 41 miles from Hersden.
Postcode districts we cover here for external mastic: CT3. That includes homes and businesses on The Firs, The Sycamores and Chequer Tree Close. We also cover Westbere (1 mile south-west), Stodmarsh (1 mile south-east), Hoath (1 mile north), Knave's Ash (1 mile north) and Sturry (2 miles west). Within a short drive, we also cover Canterbury (4 miles south-west), Margate (11 miles north-east), Dover (14 miles south-east), Ramsgate (11 miles east), Broadstairs (12 miles east) and Whitstable (6 miles north-west).
Around Hersden
Typical jobs here are in homes near Frank Montgomery School, Spires Academy and Ye Olde Yew Tree Inn, among other places. The closest station to Hersden is Sturry station, about 1.9 miles south-west. Nearby you’ll also find Canterbury Castle (4.5 miles south-west) and St Martins Hospital (3.4 miles south-west). Not far away are West Blean and Thornden Woods.
What we cannot put right
Before booking, it’s worth knowing the limits too:
- Loose or hollow render, which needs re-rendering
- Cracked brickwork or render that needs a builder or plasterer
- Subsidence or other structural problems
If you’re not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer before booking.
Joints and surfaces we work on
- Brickwork movement joints
- Concrete & block
- Joints between brick and frames
- Copings & trims
- Façade panels
- Render & cladding joints
DIY sealant or a professional job?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
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.