East Sussex · England
External & façade joints in High Cross, East Sussex
We cover High Cross for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and a 12-month guarantee.
- Plants rooting in failed movement joints
- Brick movement joints where the sealant has split
- Sealant pulling away from one side of the joint
External mastic in High Cross, done properly
For buildings in High Cross, we reseal external joints of all kinds, from brick movement joints to cladding panels. The preparation is the same whatever the wall: clean joint faces and the right depth. Common call-outs are for joints with sealant missing in places and weathered mastic that no longer stretches, on joints between brick and frames, brickwork movement joints and copings & trims.
Somewhere as small as High Cross, homes and farm buildings often face open ground, where walls and rooflines take the weather head on. Gutter joints and wall joints there need a sealant that can flex and stay put.
Our work is backed for twelve months.
- Where
- High Cross (TN6)
- Region
- East Sussex
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Keeping the joints in good condition
Joint life depends on how it’s used and looked after. We suggest:
- Check the sealant is paintable before painting near it
- Tell anyone working on the walls about the movement joints
- Avoid pressure-washing directly into sealant joints
- Deal with leaking gutters that soak the joints below
Keep the joints clear of soil, plants and climbing growth. Anything that holds water against the joint wears it out sooner.
An open movement joint lets rain into the wall every time it pours. That can lead to damp patches, staining and frost damage, all bigger jobs than a reseal.
What the job involves on each surface
Concrete and blockwork
The face of concrete or block is often dusty, so cleaning and priming matter. A primer goes on where the product requires one.
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. The old joint is removed and a sealant that bonds to both sides goes in.
What we do, step by step
Our applicators work methodically: protect, prepare, seal, tidy. Typically it takes a few hours for a handful of joints, longer for a whole elevation and we leave things clean and tidy. Somewhere as small as High Cross, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- First we look over the joints with you, agree which to renew and talk through access.
- Old sealant and any debris are cut and raked out.
- The joint faces are cleaned and primed where the sealant needs it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Getting ready for the visit
- Let us know if you’ve seen damp or leaks
- Where the joints are inside, avoid wetting them before we arrive
- Clear the area around the work
How to get a quote
Want a quote for external mastic? Please call 0345 464 0079 or drop us an email and tell us about the job. We will explain what we’d do and send you a clear quote before work begins.
Related advice
Walls and rooflines in High Cross
With historic houses such as Wadhurst Castle (about 4.9 miles east) nearby, there’s older building stock in the area around High Cross as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you live in an older home near The Parish Church of St Denys, older walls, gutters and the joints where extensions meet them need a flexible sealant. Managing a site like Rotherfield Primary School? Then its movement joints, gutters and trims need looking after like any other building’s.
High Cross is about 3 miles east of Crowborough, in East Sussex. If you need external mastic in High Cross, please call 0345 464 0079 or email us for a quick quote. We cover East Sussex from our Crawley base, High Cross included. 289 places in East Sussex are on our list. Our Crawley page covers work nearby (19 miles or so).
Our applicators cover all of the TN6 postcode area for external mastic. Being close to the B2101, High Cross is simple for us to get to for external mastic. We also cover the places around High Cross: Argos Hill (1 mile east), Rotherfield (1 mile north-west), Town Row (1 mile north), Woolbridge (1 mile south) and Wellbrook (2 miles south-east). Further out, we also cover Lewes (15 miles south-west), Hailsham (12 miles south), Crowborough (3 miles west), Uckfield (7 miles south-west), Polegate (15 miles south) and South Malling (14 miles south-west).
Landmarks near High Cross
In High Cross, that means homes and buildings near The King's Arms Public House and the streets around them. For rail, the closest station is Crowborough station, about 1.8 miles west. Other landmarks nearby include Crowborough War Memorial Hospital (3.1 miles west). Not far away are Crowborough Country Park.
Places near High Cross
Also in High Cross
For landlords and businesses
We also work for property managers and facilities teams in High Cross and across East Sussex. Several sites can be quoted together, and we are fully insured for the work.
Letting agents and landlords in High Cross can book us as well as householders. Sealant work between tenants keeps a property looking cared for.
High Cross questions
Is High Cross in your area for external mastic?
Yes. We work across London and the South East, and High Cross is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear price.
Do you cover smaller places like High Cross?
Yes, High Cross is covered. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Do you use backing rod?
That is backing rod, a closed-cell foam. It keeps the sealant at the right depth and bonded to the sides only.
Do you have insurance?
Yes. We’re fully insured, and we can confirm the details when we quote.
Do you take out the old sealant first?
Yes, always, and completely. New silicone doesn’t stick to old silicone, so the joint is cleaned back first.
Can new sealant go over the old?
No, because it fails. The old sealant always comes out first, so the new sealant bonds properly.
Do you hold any approvals?
Yes. We are approved under the ARBOMaster scheme, the approved applicator scheme for Arbo sealants.
Where is Mr Mastic based?
We are based in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
Should I try it myself first?
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so just mention it when you contact us.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
When to call us in High Cross
UV, rain and frost all age exterior sealant. In time it goes hard, crazes on the surface and stops stretching, so the next time the wall moves, it splits or pulls away.
People usually contact us when they notice something like this:
- Moss and dirt in joints with no sealant left
- Water getting into walls through failed joints
- Joints with sealant missing in places
- Sealant that has lost its bond to the brick or render
Letting a property close to Crowborough station? Then split movement joints are easy to miss on a rental until damp shows inside.
What to look for in a quote
- Which colour the sealant will be
- What the cure time is
- How the surfaces are prepared before sealing
- Whether they seal over old material or remove it
Why deal with it now?
Done well, a resealed joint is a neat, straight line that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner. Older cottages and farmhouses around High Cross can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Why choose Mr Mastic in High Cross
- Sealant colour chosen to suit
- Sanitary silicone with an anti-fungal additive in wet areas
- ARBOMaster approved applicator
- A choice of colours where the product allows
Take a look at what affects the cost and what customers say.