Essex · England
External & façade joints in Windmill Hill, Essex
Specialist external mastic for Windmill Hill: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Failed sealant between panels on a façade
- Hard, crazed mastic that has stopped moving
- Plants rooting in failed movement joints
External mastic in Windmill Hill, done properly
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, so once it splits or hardens, the joint stops working and water gets in. We are often asked to deal with water getting into walls through failed joints and movement joints with cracked, split or missing sealant, across joints between brick and frames, façade panels and render & cladding joints.
Outside joints can only be sealed when they’re dry, so work in Windmill Hill is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
The work is covered for a year after we finish. If anything isn’t right with it, ring 0345 464 0079 or drop us an email.
- Place
- Windmill Hill (CO5)
- Region
- Essex
- Cover
- 12 months on all our work
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Common questions in Windmill Hill
Do you work for landlords with property near Kelvedon station?
Yes, rental work is part of what we do. Just call 0345 464 0079 or email us and tell us about the property, and we will give you a clear quote.
Will you come out to Windmill Hill?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Can you quote for more than one area?
Yes. Tell us about everything you’d like done and we’ll quote it together.
How often do external joints need resealing?
It varies with how exposed the wall is and how much the joint moves. Look for splits, hardening or edges coming away, and reseal at that point.
Is there a guarantee?
Yes. All our work carries our one-year guarantee.
How long does external mastic take?
Most jobs take a few hours for a handful of joints, longer for a whole elevation, including preparation and clearing up. We’ll confirm how long when we quote.
Where are you based?
Mr Mastic is based in Crawley. Our applicators cover Windmill Hill, along with the rest of our area.
Can new sealant go over the old?
No. New silicone won’t bond to old silicone, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
What affects the cost of external mastic
Every job gets its own quote. These are the things that affect it:
- The size of the job
- When we can work, for business premises
- The type of sealant required
- Any mould that needs treating
A few things move the cost up or down: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
Helping us quote
What to tell us when you ask for a quote:
- Where the property is
- How we’d reach the joints
- If someone has resealed it before
- What’s wrong with the joints now
Asking for a quote is easy: let us know the job and the location. Photos by email help us understand the job.
Nearby places to Windmill Hill
What else we do in Windmill Hill
Signs you need external mastic in Windmill Hill
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.
The most common problems we see are:
- Movement joints filled with mortar instead of sealant
- Hard, crazed mastic that has stopped moving
- Sealant pulling away from one side of the joint
- Weeds or debris growing in open joints
If you look after a building such as Baynards Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Questions to ask before you book
- Who does the work, and how experienced they are
- Whether all the old sealant comes out first
- What happens if they find a problem under the old sealant
- What product goes in the joint
How to look after the new joints
A little care helps the new joints last. Our advice:
- Keep high-pressure jets off the joints
- Deal with leaking gutters that soak the joints below
- Make sure movement joints aren’t pointed over
- Ask before painting over external sealant
Only paint over the joint if we’ve confirmed the sealant can take paint. Paint can crack on a flexible joint, and paint can crack as the joint moves.
Leave a failed movement joint and water keeps getting into the wall. That can lead to damp patches, staining and frost damage, all bigger jobs than a reseal.
What happens on the day
Once we are on site, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. After that, the work takes a few hours to a few days, depending on the length of joint and the access. Somewhere as small as Windmill Hill, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
How to prepare
- Keep pets and children clear of the area while we work
- Tell us about any water getting in
- Mention if the joints have been sealed before
Getting a quote
We quote each job on its own. Just phone 0345 464 0079 or send us an email with the details and send pictures if you have them.
Related advice
What the job involves on each surface
Copings and trims
Copings expand and contract through the day, so a flexible sealant suits them best year round.
Joints between dissimilar materials
Each side of the joint may need its own preparation. We prepare both faces so the sealant bonds properly.
When it is not the sealant
New sealant cannot fix everything, and we’d rather say so up front. It won’t solve:
- Rising or penetrating damp from elsewhere in the wall
- Walls that need new movement joints cut into them
- Cracking across the wall rather than at a joint
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly before you book.
What we seal
- Joints between brick and frames
- Façade panels
- Copings & trims
- Brickwork movement joints
- Render & cladding joints
- Concrete & block
External mastic in Windmill Hill: local notes
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. With historic houses such as Layer Marney Tower (about 2.9 miles east) nearby, there’s older building stock in the area around Windmill Hill as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
Rented homes near Kelvedon station change hands often, and split movement joints are easy to miss on a rental until damp shows inside. In the older streets around Parish Church of All Saints (inworth), the joints between older walls, newer extensions and the roofline need a sealant that can move.
Windmill Hill is about 4 miles east of Witham, in Essex. Jobs in Windmill Hill get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. Across Essex, we cover 644 places, and Windmill Hill is one of them. You can also see our page for Chelmsford, roughly 12 miles from Windmill Hill.
Work in CO5 is quoted and booked the same way as anywhere else. We also cover the places around Windmill Hill: Tiptree (1 mile east), Tiptree Heath (1 mile south), Messing (2 miles north-east), Kelvedon (2 miles north-west) and Feering (2 miles north). Larger places within reach include Colchester (9 miles north-east), Chelmsford (12 miles south-west), Braintree (9 miles north-west), Maldon (6 miles south), Witham (4 miles west) and Camulodunum (8 miles north-east).
What’s near Windmill Hill
Locally, jobs take us to homes and businesses close to Tiptree Parish Field, The Bonnie Blue Oak pub and Thurstable School Sports College and Sixth Form Centre and the streets around them. Windmill Hill’s nearest station is Kelvedon station, about 2.1 miles north-west. A little further out are Anchor Press Museum (1.1 miles east) and Birch Castle (4.3 miles north-east). The countryside around Windmill Hill includes Tiptree Heath Nature Reserve.
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.