West Sussex · England
External Mastic in West Grinstead
External mastic for West Grinstead, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Old sealant gone brittle and cracked
- Failed sealant between panels on a façade
- Rigid filler in a joint that should flex
Quotes for external mastic in West Grinstead
Call for a quick quote. What matters most is:
- When we can work, for business premises
- How many rooms, windows or areas are involved
- Mould in or behind the old joints
- Whether the work is at height
Leaving a failed joint normally makes the job bigger, not smaller, as water and mould keep getting in. If you are unsure, ring 0345 464 0079 or drop us an email for an honest opinion and a quote.
What we need to know
There’s no need for technical detail. Just tell us:
- How many joints, rooms or windows are involved
- Whether it has been sealed before
- If it’s domestic, commercial or a hotel
- Pictures of the joints, sent by email
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is. When it suits you, ring 0345 464 0079 or drop us an email.
About our external mastic in West Grinstead
For buildings in West Grinstead, we reseal external joints of all kinds, from brick movement joints to cladding panels. Every joint gets the same careful preparation: clean joint faces and the right depth. If you have weathered mastic that no longer stretches and leaking joints around cladding and façade panels, we can help, on façade panels, render & cladding joints and copings & trims alike.
Older homes in small places like West Grinstead may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water normally gets in.
Whatever the size of the job, you get the same one-year guarantee in West Grinstead and across West Sussex.
- Where
- West Grinstead (RH13)
- Wider area
- West Sussex
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What we’re called out for in West Grinstead
Many joints fail because they were sealed too deep or with nothing behind them. Sealant bonded to three sides has nowhere to go and rips as the joint opens.
Any of these means the joints need attention:
- Failed seals between different materials
- Old sealant gone brittle and cracked
- Joints where the bead has come unstuck
- Failed sealant between panels on a façade
Around West Grinstead, as everywhere, external mastic is only as good as the preparation behind it.
Before you book anyone
- Is the old sealant removed completely?
- How hidden problems are handled
- How long the guarantee is
- What the cure time is
What we do, step by step
A visit follows a simple pattern: we look at the joints together, protect the area around them, carry out the job and tidy away. It normally takes a few hours for a handful of joints, longer for a whole elevation. In a small place like West Grinstead, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- The old mastic and anything lodged in the joint is removed.
- Both sides are cleaned back to sound material and primed if needed.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
How to prepare
- Try not to wet indoor joints just before the visit
- Keep pets and children clear of the area while we work
- Let us know about parking restrictions
Get a quote
Every job is quoted individually, so start by telling us what you need. Simply call 0345 464 0079 or email us and describe the job.
Read more
Aftercare tips
Aftercare is simple, and it makes a real difference:
- Make sure movement joints aren’t pointed over
- Check external joints each spring
- Deal with leaking gutters that soak the joints below
- Don’t let climbing plants root in the sealant
Keep the joints clear of soil, plants and climbing growth. Damp material against the sealant shortens its life.
Gaps, plants or missing sealant in a joint are worth getting looked at. Early work is quicker and leaves a better finish.
Common questions in West Grinstead
What guarantee comes with external mastic in West Grinstead?
Every job comes with our 12-month guarantee, wherever it is. We’re fully insured, and an ARBOMaster approved applicator.
Is West Grinstead in your area for external mastic?
Yes. Our work covers London and the South East, and West Grinstead is part of that. Just call 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear quote.
Are you ARBOMaster approved?
Yes. We are an ARBOMaster approved applicator, which is run for the Arbo sealant brand.
Can new sealant go over the old?
No, and we never do. It can look neat for a few weeks, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
What’s an expansion joint in brickwork?
Most straight vertical gaps in brickwork are movement joints. It lets the bricks expand without cracking, and it should be sealed with a flexible sealant.
Can I do it myself?
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.
Why do you put foam in the joint first?
The foam is closed-cell backing rod. It stops the sealant going in too deep and bonding to three sides so it can flex with the joint.
Will it make a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
Why deal with it now?
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That protects surfaces like brick, render and concrete. Too stiff a sealant can pull at the edges and break them. Older cottages and farmhouses around West Grinstead can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
Why West Grinstead clients choose us
- You choose the colour before work begins
- An ARBOMaster approved applicator
- White, clear, grey or another colour, product permitting
- More than 20 years in sealant work
What the job involves on each surface
Brickwork movement joints
Brick walls have vertical movement joints to absorb expansion. We reseal them with a low-modulus sealant over backing rod coloured to suit the wall.
Cladding and façade panels
Where a cladding system has its own specified sealant, we follow it or an approved alternative. Send us any details you have about the façade.
Outside joints around West Grinstead
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you live in an older home near Shrine Church of Our Lady of Consolation and St Francis, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
West Grinstead is about 6 miles south of Horsham, in West Sussex. We provide external mastic to homeowners, landlords and businesses in West Grinstead. 371 places in West Sussex are on our list. You can also see our page for Crawley, about 11 miles away.
Every address in RH13 is covered for external mastic, from the main roads to the quietest streets. You’ll find streets such as Steyning Road, Carylls Meadow and Clothalls Lane. If you’re just outside West Grinstead, we cover Littleworth (1 mile south-east), Partridge Green (1 mile south-east), Dial Post (2 miles south-west), Shipley (2 miles west) and Whitehall (2 miles west). Larger places within reach include Crawley (11 miles north-east), Horsham (6 miles north), Worthing (11 miles south), Haywards Heath (10 miles east), Burgess Hill (9 miles east) and Littlehampton (15 miles south-west).
Local landmarks in West Grinstead
Green spaces nearby include Knepp Wildland.
Nearby places to West Grinstead
Also in West Grinstead
For landlords and businesses
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will give you a quote.