West Sussex · England
Shermanbury External Mastic
External mastic for Shermanbury and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Brick movement joints where the sealant has split
- Leaking joints around cladding and façade panels
- Damp patches traced to an open external joint
Signs you need external mastic in Shermanbury
Poor preparation causes many early failures: dusty or wet faces, no primer where one was needed, or old sealant left in. The sealant never bonds properly.
Signs it’s time to call us include:
- Failed sealant between panels on a façade
- Sealant pulling away from one side of the joint
- Failed seals between different materials
- Moss and dirt in joints with no sealant left
Schools such as Jolesfield CofE Primary School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Comparing quotes
- What happens if they find a problem under the old sealant
- How the colour is chosen
- What product goes in the joint
- Who does the work, and how experienced they are
External mastic in Shermanbury, done properly
External mastic is a job where short cuts show quickly. Overfilled joints, missing backing rod and sealant laid over old sealant rarely last long. We strip the joint back and start again. We work on façade panels, copings & trims and render & cladding joints, and people most often call us about movement joints filled with mortar instead of sealant and failed sealant between panels on a façade.
External sealant needs dry, clean surfaces, so work around Shermanbury is planned for dry weather. Tell us about access to all sides of the building, including outbuildings and garages.
You are covered for a year from the day we finish. If there’s a problem with it, please ring 0345 464 0079 or drop us an email.
- Place
- Shermanbury (RH13)
- Region
- West Sussex
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Places near Shermanbury
Other services in Shermanbury
What affects the cost of external mastic
Call for a quick quote. The main things that affect it are:
- The old material and how stubborn it is
- When we can work, for business premises
- Any mould that needs treating
- Whether the work is at height
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs. Ask us for a quote and we will explain what it covers.
Helping us quote
What to tell us when you ask for a quote:
- How many joints, rooms or windows are involved
- Whether it’s a home or a business
- If someone has resealed it before
- What the problem is, such as mould, gaps, leaks or cracking
Asking for a quote is easy: let us know what needs doing and where and its rough size. A few pictures by email make the job easier to understand, and we’ll come back to you with a quote.
Why deal with it now?
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That matters on brick, render and concrete, which can be weaker at the face. Too stiff a sealant can pull at the edges and break them. In a small place like Shermanbury, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please call 0345 464 0079 or email us and we will talk you through it.
What you get with us
- Sealant colour chosen to suit
- Any old sealant cut out fully, not covered over
- 180+ five-star Google reviews
- 12-month guarantee on every job
Take a look at what affects the cost and our reviews.
What the job involves on each surface
Joints between dissimilar materials
Brick against render, concrete against metal, stone against timber: every change of material is a joint. A flexible sealant bridges the two.
Copings and trims
Coping joints that leak let water straight down into the wall. Resealing them is a small job that protects a lot.
DIY versus a professional finish
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
If you’ve already had a go yourself, that is fine. We cut it out and start again, so tell us about it when you ask for a quote.
Common questions in Shermanbury
Do you cover smaller places like Shermanbury?
Yes. Shermanbury 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.
Is external mastic in Shermanbury guaranteed?
Every job comes with our 12-month guarantee, wherever it is. We’re also fully insured and ARBOMaster approved.
Is there any odour?
There can be a smell while the sealant cures, which fades as it sets. Ventilation helps.
Will you leave a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
Can a movement joint be filled with mortar?
No, not where the gap is a movement joint. Pointing it stops it working. We will reseal it with a flexible sealant.
How do I get a quote for external mastic in Shermanbury?
Size, access and the old material all affect the cost. Call for a quick quote.
When is the sealant fully cured?
Different products cure at different speeds, so follow the cure time we give you.
Do I need to be at home?
We need access to the joints, so we’ll agree that with you when we book. Indoors, that generally means someone at home.
When it isn’t the sealant
To be straight with you, there are a few things sealant won’t fix:
- Walls that need new movement joints cut into them
- Rising or penetrating damp from elsewhere in the wall
- Cracking across the wall rather than at a joint
If you’re not sure, just ring 0345 464 0079 or drop us an email and we will give you a straight answer before booking.
Joints and surfaces we work on
- Concrete & block
- Copings & trims
- Render & cladding joints
- Brickwork movement joints
- Façade panels
- Joints between brick and frames
How the visit works
There’s no need to move everything out before we come, only the area right around the joints. Everything nearby is protected, and the work takes a few hours for a handful of joints, longer for a whole elevation in most cases. For a village or hamlet like Shermanbury, the journey is planned in advance: let us know about lanes, gates and parking. 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
- On commercial sites, let us know about site rules
- Mention any tricky access
- Tell us if parking is tricky
Get a quote
Every job is quoted individually. Simply ring 0345 464 0079 or send us an email and describe the job, and photos are welcome.
Advice
Shermanbury buildings and the weather
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.
For an older house near a landmark such as The Parish Church of St Giles, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Shermanbury is about 7 miles west of Burgess Hill, in West Sussex. Shermanbury gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Our area takes in 371 places across West Sussex. Crawley is on our list too, around 11 miles away.
Postcode districts we cover here for external mastic: RH13. We cover properties on Knapp Drive, Brighton Road and Partridge Green Road. Close by, we work in Kent Street (2 miles north-east), Cowfold (2 miles north), Wineham (2 miles east), Henfield (2 miles south) and Blackstone (3 miles south-east). Further out, we also cover Crawley (11 miles north), Horsham (7 miles north), Worthing (11 miles south-west), Haywards Heath (9 miles east), Burgess Hill (7 miles east) and Littlehampton (15 miles south-west).
What’s near Shermanbury
Typical jobs here are in homes near The Bull Inn. Other landmarks nearby include The Dene Hospital (5.2 miles east). The countryside around Shermanbury includes Knepp Wildland.