West Sussex · England
External Mastic in Ashurst Wood
Our applicators work in Ashurst Wood on sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Rigid filler in a joint that should flex
- Brick movement joints where the sealant has split
- Hard, crazed mastic that has stopped moving
External mastic in Ashurst Wood, done properly
Joints in render and cladding are easy to overlook until a damp patch appears. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant in a colour to suit. If you have gaps where render, brick and frames meet and moss and dirt in joints with no sealant left, we can help, on brickwork movement joints, façade panels and joints between brick and frames alike.
Outside joints can only be sealed when they’re dry, so work in Ashurst Wood is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
Our work is backed for twelve months, in Ashurst Wood and everywhere else we cover.
- Location
- Ashurst Wood (RH19)
- Region
- West Sussex
- Cover
- One year on every job
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Questions from Ashurst Wood
I let a flat near East Grinstead station. Can you help?
Yes, we work for landlords and letting agents. You can ring 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before any work starts.
Do you cover Ashurst Wood for external mastic?
Yes. Our work covers London and the South East, and Ashurst Wood is part of that. Just phone 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear price.
How long does external mastic take?
A typical job takes a few hours for a handful of joints, longer for a whole elevation. We will confirm how long when we quote.
Do you have insurance?
Yes, we’re fully insured for domestic and commercial work.
Will you leave a mess?
We keep the work tidy. Nearby surfaces are protected, and the area is left clean when we finish.
How much does external mastic cost in Ashurst Wood?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote and we will talk you through it.
Does someone need to be in?
We need access to the joints, so we’ll agree that with you when we book. Indoors, that normally means someone at home.
Are you ARBOMaster approved?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Also near Ashurst Wood
What else we do in Ashurst Wood
Walls and rooflines in Ashurst Wood
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Hammerwood Park (about 1.9 miles north-east) nearby, there’s older building stock in the area around Ashurst Wood as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
If you let a flat or house near East Grinstead station, split movement joints are easy to miss on a rental until damp shows inside. For an older house near a landmark such as St Dunstan, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Ashurst Wood is about 2 miles south-east of East Grinstead, in West Sussex. Homes, rented property, offices and hotels in Ashurst Wood can book us for external mastic, old or new, large or small. Every job comes with our one-year guarantee. Across West Sussex, we cover 371 places, Ashurst Wood among them. For nearby work, see our Crawley page (9 miles or so).
Postcode districts we cover here for external mastic: RH19. We cover properties on Woods Hill Lane, Wray Close and Woods Hill Close and the roads around them. Neighbouring places we cover for external mastic include East Grinstead (2 miles north-west), Hammerwood (2 miles north-east), Saint Hill Green (2 miles west), Dormans Park (3 miles north-west) and Dormansland (4 miles north). Within a short drive, we also cover Crawley (9 miles west), Horsham (15 miles west), Haywards Heath (10 miles south-west), Burgess Hill (13 miles south-west), Broadfield (10 miles west) and Bewbush (11 miles west).
Local landmarks in Ashurst Wood
Locally, jobs take us to homes and businesses close to The Maypole Inn, Sackville School and Stoke Brunswick School and the streets around them. For rail, the closest station is East Grinstead station, roughly 2.1 miles north-west of the centre. A little further out are East Grinstead Museum (1.6 miles north-west) and Bolebroke Castle (3.5 miles east). Not far away are Hedgecourt Lake.
Leave it or put it right?
Sealing over the top of old mastic does not hold for long. The new layer can’t bond properly to old, weathered material, so the old joint is cut out fully first. Around Ashurst Wood, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please phone 0345 464 0079 or send us an email.
What you get with us
- Domestic, commercial and hotel work
- A choice of colours where the product allows
- 20+ years of sealant experience
- Sealant colour chosen to suit
When something else is needed
We will not take on work that won’t last, so these are the limits:
- Loose or hollow render, which needs re-rendering
- Adding movement joints to masonry that has none
- Rising or penetrating damp from elsewhere in the wall
If you are not sure, just call 0345 464 0079 or email us and we will give you a straight answer before you book.
Joints and surfaces we work on
- Brickwork movement joints
- Render & cladding joints
- Concrete & block
- Façade panels
- Copings & trims
- Joints between brick and frames
When to call us in Ashurst Wood
The wrong product in a moving joint is a classic cause. A high-modulus or general-purpose sealant can be too rigid for a busy joint, and it tears off the sides.
Most people get in touch when they notice one of these:
- Joints with sealant missing in places
- Weathered mastic that no longer stretches
- Gaps where render, brick and frames meet
- Water getting into walls through failed joints
Schools such as Ashurst Wood Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
Comparing quotes
- What preparation is included
- Which colour the sealant will be
- Who turns up on the day
- How long the guarantee is
What we do, step by step
We keep the work tidy and contained to the area we’re working on, so you can carry on as normal. The job usually takes a few hours for a handful of joints, longer for a whole elevation, and we tell you how long to leave it before we go. Somewhere as small as Ashurst Wood, access is often the only tricky part. 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.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Getting ready for the visit
- Mention any tricky access
- Mention any leaks or damp you’ve noticed
- Keep children and pets away from the work area
Getting a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and add pictures by email if you can.
Read more
Looking after it afterwards
So the new joints stay in good condition:
- Show decorators and builders where the movement joints are
- Ask before painting over external sealant
- Make sure movement joints are not pointed over
- Keep water from gutters off the wall
Do not let soil, plants or ivy build up against the new joints. Damp material against the sealant shortens its life.
Water getting behind cladding or render can go unnoticed for a long time. When it finally shows inside, the joint may have been open for years, so it’s worth resealing at the first signs.
How we quote for external mastic
Jobs vary more than people expect. What affects the quote:
- How many rooms, windows or areas are involved
- The size of the job
- Mould in or behind the old joints
- The old material and how stubborn it is
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference.
What to tell us for a quote
Before you ask for a quote, have a think about:
- If it’s domestic, commercial or a hotel
- If someone has resealed it before
- Roughly how big the job is
- The problem you’ve noticed
Getting a quote is simple: let us know the job and the location and its rough size. A few photos by email make the job easier to understand, and we will come back to you with a quote.
What the job involves on each surface
Render joints
Rendered walls have joints at beads, openings and changes of material. We reseal them with a flexible exterior sealant that suits the render colour.
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. They’re resealed over backing rod with a low-modulus sealant in a colour to suit the brick.