Greater London · England
External Mastic in St Paul's Cray
We cover St Paul's Cray for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly.
- Sealant that has lost its bond to the brick or render
- Joints pointed up with cement by mistake
- Rain getting behind render or cladding at a joint
St Paul's Cray buildings and the weather
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Bromley Palace (about 3.7 miles west) are a reminder that the area around St Paul's Cray has older buildings as well as new. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
If you look after a building such as Leesons Primary School, larger buildings have long runs of movement joint that eventually need resealing. If you live in an older home near St Barnabas, an extension built onto an older house moves differently, and the joint between them takes the strain.
St Paul's Cray is about 1 mile north of Orpington, in Greater London. Whether you are in the middle of St Paul's Cray or further out, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. We cover 764 towns and villages across Greater London. You can also see our page for London, roughly 11 miles from St Paul's Cray.
Every address in BR5 and BR7 is within our area for external mastic, from the main roads to the quietest streets. Streets in the area include Main Road, Murray Road and Rushet Road, all of which we cover. Neighbouring places we cover for external mastic include St Mary Cray (1 mile south), Poverest (1 mile south), Derry Downs (1 mile south), Orpington (1 mile south) and Kevington (2 miles south-east). Within a short drive, we also cover London (11 miles north-west), City of Westminster (14 miles north-west), Marylebone (14 miles north-west), Kensington (15 miles north-west), St Pancras (13 miles north-west) and Shoreditch (12 miles north-west).
Near you in St Paul's Cray
Around St Paul's Cray, our work takes us to homes and buildings near Kemnal Technology College, The Blue Anchor Public House and Walsingham School, among other places. St Paul's Cray has its own railway station: St Mary Cray station. Well-known places in the area include Lullingstone Castle (4.8 miles south-east) and London Borough of Bromley Museum (1.5 miles south). Green spaces nearby include The Warren and Summer Hill.
About our external mastic in St Paul's Cray
A movement joint is a deliberate break that lets a wall expand and contract. Its sealant has to flex with the building, season after season, so once it splits or hardens, the joint stops working and water gets in. If you’re dealing with moss and dirt in joints with no sealant left and movement joints with cracked, split or missing sealant, we can help, on brickwork movement joints, render & cladding joints and copings & trims alike.
Modern London flats rely on sealed movement joints and cladding joints. Older terraces have their own weak points: gutter joints, roofline trims and the joint where an extension meets the original wall.
We guarantee the work for a year. If something is not right with it in that time, tell us and we’ll put it right.
- Location
- St Paul's Cray (BR5, BR7)
- Region
- Greater London
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Questions from St Paul's Cray
Do you cover St Paul's Cray for external mastic?
Yes, St Paul's Cray is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or drop us an email and tell us what needs doing, and we will give you a clear price.
Is parking a problem for a job in St Paul's Cray?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.
Can you match the colour of my brickwork?
Exterior sealants are made in a range of colours, from greys and browns to whites and stone shades. We choose the closest to your brick or render so the joint doesn’t draw the eye.
Can you do several jobs on one visit?
Of course. Doing several areas at once is normally more efficient.
Do you use backing rod?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. Then the sealant bonds to two faces and can move.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status, and we’re fully insured.
I’m a tenant. Can you help?
Yes. Check with your landlord; we can send the quote to them too.
Are you fully insured?
Yes. We’re fully insured.
Places near St Paul's Cray
More services for St Paul's Cray
DIY sealant or a professional job?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
How the visit works
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The job generally takes a few hours for a handful of joints, longer for a whole elevation from start to finish. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in St Paul's Cray. A visitor permit or a nearby bay makes the visit run more smoothly.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- Keep children and pets away from the work area
- For business premises, tell us about site rules or sign-in
- For indoor joints, keep the area dry beforehand if you can
How to get a quote
There’s no standard price list, because every job is different. Instead, we give you a clear quote for your job. To arrange one, phone 0345 464 0079 or send us an email.
Read more
How we quote for external mastic
There’s no set price list. The quote depends on:
- Whether the work is at height
- How many areas need sealing
- The old material and how stubborn it is
- The type of sealant required
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, plus any working-time requirements on site. Call for a quick quote and we will go through it with you.
Helping us quote
There’s no need for technical detail. Just tell us:
- Whether it has been sealed before
- Where the job is, and your postcode
- The type of property
- Photos by email, if that is easy
Need a quote? Please call 0345 464 0079 or email us and tell us about the job. We will explain what we’d do and give you a clear price before work begins.
What the job involves on each surface
Copings and trims
Copings expand and contract through the day, so the joints need a sealant that stays flexible.
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. We reseal their joints with backing rod and a flexible product.
What we are called out for in St Paul's Cray
Every building moves. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. The sealant in the movement joints takes that strain.
The problems people normally mention when they call include:
- Joints pointed up with cement by mistake
- Joints with sealant missing in places
- Damp patches traced to an open external joint
- Old sealant gone brittle and cracked
As a London address, St Paul's Cray can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
What your quote should include
- Whether VAT is included
- Is the old sealant removed completely?
- What preparation is included
- How the colour is chosen
Landlord and commercial work in St Paul's Cray
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
If you manage several properties in or around St Paul's Cray, several properties can be quoted together. Send us the addresses and the work at each.
How to look after the new joints
Simple care keeps the joints in good condition. Our advice:
- Check external joints each spring
- Keep water from gutters off the wall
- Get split or bare joints resealed while the damage is small
- Keep high-pressure jets off the joints
Keep pressure washers away from the sealant. A strong jet can damage the edges of the bead and let water in behind.
Act while the splits are small. Then it’s a straightforward cut-out and reseal.