Kent · England
External & façade joints in Windmill Hill, Kent
External mastic across Windmill Hill and nearby, with every bit of old sealant taken out first and a 12-month guarantee.
- Damp patches traced to an open external joint
- Movement joints filled with mortar instead of sealant
- Sealant pulling away from one side of the joint
External mastic in Windmill Hill
Many failed façade joints only get noticed once there’s a stain or a damp patch inside. We look over the joints, agree the ones to renew and reseal with a flexible, weatherproof product in a colour to suit. We’re often asked to deal with panel joints letting water in and hard, crazed mastic that has stopped moving, across render & cladding joints, concrete & block and façade panels.
In a smaller place like Windmill Hill, some homes face open ground, and walls and rooflines facing the weather take the worst of it. Joints on those sides are generally the first to go.
You get a 12-month guarantee, the same in Windmill Hill as everywhere else we work.
- Location
- Windmill Hill (DA12, DA11)
- Region
- Kent
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Why deal with it now?
Water gets in through a failed movement joint. Resealing early keeps the job to the joint itself, rather than the wall around it. In an older home around Windmill Hill, damp from a failed joint can get into timber and plaster, which is far harder to put right than the sealant itself.
Combining jobs into one visit generally makes better use of the time than several visits. You will get one clear quote for the whole job.
Why choose Mr Mastic in Windmill Hill
- Neat joints and a tidy finish
- More than 20 years in sealant work
- Experience in homes, commercial sites and hotels
- Trusted Arbo and Everbuild sealants
Read what affects the cost and our reviews.
Aftercare tips
How long the joints last depends on use and care. We suggest:
- Deal with leaking gutters that soak the joints below
- Wash walls gently around the sealant
- Walk round the building once a year and look at the joints
- Have failed joints looked at early
Do not let soil, plants or ivy build up against the new joints. Damp material against the sealant shortens its life.
Once a joint cannot move, the wall finds another way, often as cracks near the joint. Resealing it early helps prevent that.
What we do, step by step
You do not need to clear the whole room or building, only the area right around the joints. Everything nearby is protected, and the work takes a few hours to a few days, depending on the length of joint and the access for a typical job. Parking around Windmill Hill is generally easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- For indoor joints, keep the area dry beforehand if you can
- Mention any sign-in or site rules at work premises
- Clear items away from the joints we are working on
How to get a quote
It all starts with a short chat. Describe the problem, the location and the size of the job. Whenever you are ready, call 0345 464 0079 or email us.
Advice
Work for landlords, hotels and businesses
If you manage several properties in or around Windmill Hill, several properties can be quoted together. Just tell us the addresses and what each one needs.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Signs you need external mastic in Windmill Hill
Sometimes a movement joint was filled with mortar or a rigid filler. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
Keep an eye out for these signs:
- Gaps where render, brick and frames meet
- Brick movement joints where the sealant has split
- Rigid filler in a joint that should flex
- Joints where the bead has come unstuck
Rented homes near Gravesend station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets.
Before booking anyone
- How the joint is cleaned and prepared
- How long the guarantee is
- Who turns up on the day
- Whether you can choose the colour
Honest limits
We will always be straight with you, so here’s what sealant cannot fix:
- Cracked brickwork or render that needs a builder or plasterer
- Movement that is more than a sealant joint can take
- Adding movement joints to masonry that has none
If in doubt, ring 0345 464 0079 or email us and we’ll say what we think.
Where we work in Windmill Hill
- Joints between brick and frames
- Copings & trims
- Render & cladding joints
- Brickwork movement joints
- Façade panels
- Concrete & block
Outside joints around Windmill Hill
Windmill Hill is within about 2 miles of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on movement joints and outside wall joints, especially on the side facing the sea. With historic houses such as Cobham College (about 3.3 miles south) nearby, there’s older building stock in the area around Windmill Hill as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
In the older streets around Christ Church Milton, an extension built onto an older house moves differently, and the joint between them takes the strain. Managing a site like Wrotham Road Primary School? Then larger buildings have long runs of movement joint that eventually need resealing.
Windmill Hill is about 1 mile north-west of Gravesend, in Kent. We provide external mastic to homes and businesses in Windmill Hill and nearby. Windmill Hill is one of 922 places in Kent where we work. There’s also a page for London, about 21 miles away.
All of DA12 and DA11 is within our area for external mastic, from the main roads to the quietest streets. We cover properties on New Road, Sun Lane and Joy Road. Windmill Hill is on the A227, which makes it straightforward to reach with everything needed for external mastic. Nearby, we also carry out external mastic in Gravesend (1 mile south-east), Milton-next-Gravesend (1 mile north-east), Denton (1 mile east), Northfleet (1 mile west) and Painters Ash (2 miles south-west). Larger places within reach include Maidstone (13 miles south-east), Dartford (6 miles west), Sevenoaks (13 miles south-west), Swanley (9 miles west), Kings Hill (11 miles south) and Foley Park (13 miles south-east).
What’s near Windmill Hill
Around Windmill Hill, our work takes us to homes and buildings near St John's Catholic Comprehensive, Mayfield Grammar School and The Waterloo Public House, among other places. The closest station to Windmill Hill is Gravesend station, roughly 0.5 miles north-west of the centre. Nearby you’ll also find Gravesham Museum (0.5 miles north) and Stone Castle (4.1 miles west). Not far away are Sawyers Lake and Gad's Hill.
FAQs for Windmill Hill
Will you come out to Windmill Hill?
Yes, Windmill Hill is covered. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Does living near the coast affect external mastic in Windmill Hill?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. The right product, a clean joint and the right depth all help it cope.
Can new sealant go over the old?
No. Fresh sealant does not stick to old sealant, and it traps any mould or water underneath. We remove it all first.
What should I tell you?
A short description and the location, with photos by email if possible. We will ask anything else we need to know.
How long does external mastic last?
That depends on the wall, the weather and the movement. Look for splits, hardening or edges coming away.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done and we will quote it together.
Do you seal joints where cladding meets other materials?
Yes. We cut out the old sealant, prepare both faces and reseal with a flexible exterior product. The colour is chosen to suit.
Do the sealants smell?
There can be a smell while the sealant cures, which fades as it sets. Ventilation helps.
Surface by surface
Concrete and blockwork
Big joints in concrete need careful depth control. Backing rod sized to the joint sets it.
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. We reseal them with a low-modulus sealant over backing rod.