West Sussex · England
Felcourt External Mastic
Professional external mastic in and around Felcourt, with every bit of old sealant taken out first and a 12-month guarantee.
- Sealant pulling away from one side of the joint
- Failed seals between different materials
- Old sealant gone brittle and cracked
About our external mastic in Felcourt
We’re ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Porous or awkward surfaces are primed where the sealant needs it, and we do not skip that step. We’re often asked to deal with old sealant gone brittle and cracked and joints with sealant missing in places, on concrete & block, joints between brick and frames and brickwork movement joints.
External sealant needs dry, clean surfaces, so work around Felcourt is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Where
- Felcourt (RH19, RH7)
- Wider area
- West Sussex
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Why deal with it now?
An open joint keeps letting water into the wall with every downpour. In cold weather, frost can damage wet brick and render around the joint, so the damage spreads beyond the joint. In a small place like Felcourt, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Why book with us
- Any old sealant cut out fully, not covered over
- Anti-fungal sanitary silicone in wet areas
- Homes, businesses and hotels
- Full insurance on every job
Read our cost guide or customer reviews.
Do you need external mastic in Felcourt?
Some movement joints have been pointed up with mortar by mistake. The joint can’t move, so the wall cracks somewhere else instead.
Keep an eye out for any of the following:
- Leaking joints around cladding and façade panels
- Damp patches traced to an open external joint
- Sealant pulling away from one side of the joint
- Moss and dirt in joints with no sealant left
Historic houses such as Saint Hill Manor, about 3.7 miles south, show how far back building around Felcourt goes.
Before you book anyone
- Is the old sealant removed completely?
- How hidden problems are handled
- How long to leave it before use
- Which colour the sealant will be
Nearby places to Felcourt
More services for Felcourt
Felcourt questions
Will you come out to Felcourt?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Is Felcourt in your area for external mastic?
Yes. Our work covers London and the South East, and Felcourt is part of that. You can phone 0345 464 0079 or email us and tell us what needs doing, and we’ll give you a clear price.
How long does external mastic last?
That varies with the weather the wall faces, how much it moves and the sealant used. Sealant is a maintenance item, so check the joints once a year.
What’s an expansion joint in brickwork?
Walls move with heat, cold and moisture, and planned joints take up that movement. The gap is sealed with a flexible sealant over backing rod.
Is there any odour?
There can be a smell while the sealant cures. Opening a window helps.
Where do you work from?
Our base is Crawley, with over 20 years’ experience. We work across South East England, London and Scotland.
Will you leave a mess?
No. The area is protected while we work and cleaned up afterwards.
Can you seal over the old sealant?
No, it will not last. 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.
Different surfaces, different methods
Concrete and blockwork
Concrete faces can be dusty and porous, so preparation is key. We prime where the sealant needs it before sealing.
Cladding and façade panels
If the façade has a specified sealant, that’s what we use. Send us any details you have about the façade.
For landlords and businesses
If you manage several properties in or around Felcourt, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.
Hotels need rooms back in use, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
What happens on the day
Before we leave, we go over the finished joints with you and explain the cure time. The work normally takes a few hours to a few days, depending on the length of joint and the access, depending on the size of the job. Somewhere as small as Felcourt, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
How to prepare
- For business premises, tell us about site rules or sign-in
- Tell us about any water getting in
- Mention any parking rules near the property
Ask for a quote
There’s no standard price list, because every job is different. Instead, we give you a clear quote for your job. To get started, call 0345 464 0079 or email us.
Related advice
How we quote for external mastic
Call for a quick quote. What matters most is:
- How easy the joints are to reach
- Any mould that needs treating
- Any working-time requirements on site
- The number of rooms or windows
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you are unsure, ring 0345 464 0079 or email us and we’ll give you an honest view and a quote.
Helping us quote
Photos help, but a description is a good start. Try to tell us:
- If it’s domestic, commercial or a hotel
- A few photos by email, if you can
- The rough size of the job
- Whether it has been sealed before
To get a quote, phone 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. We will give you a clear price before any work starts.
Felcourt buildings and the weather
Historic houses like Saint Hill Manor (about 3.7 miles south) are a reminder that the area around Felcourt has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Letting a property close to Dormans station? Then outside joints that have cracked can let damp into a rental, so check them between lets. For site and facilities teams at buildings such as Bush Davies School of Theatre Arts, its movement joints, gutters and trims need looking after like any other building’s.
Felcourt is about 2 miles north of East Grinstead, in West Sussex. Felcourt gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. We cover 371 towns and villages across West Sussex, large and small. Our Crawley page covers work nearby, about 8 miles away.
Work in RH19 and RH7 is quoted and booked the same way as anywhere else. Whether your property is on Felcourt Lane, Felcourt Road and Blackberry Road or a nearby road, we can help. Other places close to Felcourt include Dormans Park (1 mile south-east), Newchapel (1 mile west), Lingfield (1 mile north), Dormansland (1 mile east) and Felbridge (2 miles south-west). Larger places within reach include Crawley (8 miles south-west), Horsham (14 miles south-west), Haywards Heath (12 miles south), Burgess Hill (15 miles south), Broadfield (9 miles south-west) and Bewbush (9 miles south-west).
Local landmarks in Felcourt
We work in homes and buildings around Centenary Fields and Imberhorne School and the streets around them. For rail, the closest station is Dormans station, about 0.8 miles east. Well-known places in the area include Queen Victoria Hospital (1.9 miles south-east) and East Grinstead Museum (2.5 miles south). The countryside around Felcourt includes Hedgecourt Lake.
Looking after it afterwards
So the new joints stay in good condition:
- Wash walls gently around the sealant
- Walk round the building once a year and look at the joints
- Tell anyone working on the walls about the movement joints
- Fix overflowing gutters above sealed joints
Only paint over the joint if we’ve confirmed the sealant can take paint. Many exterior sealants are not designed to be painted, and paint can crack as the joint moves.
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.