Greater London · England
External Mastic in Wennington
External mastic in Wennington from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Rain getting behind render or cladding at a joint
- Sealant pulling away from one side of the joint
- Joints with sealant missing in places
About our external mastic in Wennington
A movement joint is only as good as its depth. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, leaving it bonded to two faces so it can move with the wall. If you are dealing with leaking joints around cladding and façade panels and plants rooting in failed movement joints, we can help, whatever the surface.
Outside work in London starts with access: side passages, upper floors and where to park. In Wennington, joints up high may need ladders or other access, which is worth talking through when you book.
Whatever the size of the job, you get the same 12-month guarantee in Wennington and across Greater London.
- Place
- Wennington (RM13)
- Region
- Greater London
- Guarantee
- One year on every job
- Price
- A clear price before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What external mastic looks like in Wennington
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. Historic houses like Rainham Hall (about 1.5 miles north-west) are a reminder that the area around Wennington has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
For an older house near a landmark such as St Mary and St Peter's Church, old and new materials meet at the roofline and walls, which is where sealant earns its keep. Wennington is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Wennington is about 4 miles south of Hornchurch, in Greater London. Whether you’re in the middle of Wennington or further out, we cover external mastic for every kind of property. 764 places in Greater London are on our list, large and small. There’s also a page for London, about 14 miles away.
Postcode districts we cover here for external mastic: RM13. Close by, we work in Aveley (1 mile east), Hacton (2 miles north), South Ockendon (3 miles east), Upminster Bridge (4 miles north) and Hornchurch (4 miles north). Further out, we also cover London (14 miles west), St Pancras (15 miles west), Shoreditch (13 miles west), Walthamstow (12 miles north-west), Hoxton (13 miles west) and Whitechapel (12 miles west).
Around Wennington
In Wennington, that means homes and buildings near Lennard Arms Inn, Wildspace Conservation Park and Harris Academy Rainham. The nearest railway station is Rainham (Essex) station, roughly 1.4 miles north-west of the centre. Nearby you’ll also find St George's Hospital (2.8 miles north) and Erith Museum (2.5 miles south-west). Green spaces nearby include Rainham Marshes Nature Reserve.
What affects the quote in Wennington
We don’t publish a price list, because no two jobs are the same. The quote depends on:
- Whether there’s mould to deal with
- The amount of work
- Access and height
- How many areas need sealing
Some things make a job bigger or smaller: 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.
Asking for a quote
Photos by email are helpful but not essential. Try to tell us:
- What’s wrong with the joints now
- Access, such as stairs, a lift or height
- Whether it has been sealed before
- Roughly how big the job is
For a quote, call 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. You’ll have a clear quote before work begins.
Wennington: your questions answered
I let a flat near Rainham (Essex) station. Can you help?
Yes, rental work is part of what we do. Just call 0345 464 0079 or send us an email and tell us about the property, and we’ll give you a clear quote.
Do you cover Wennington for external mastic?
Yes. We work across London and the South East, and Wennington is part of that. You can ring 0345 464 0079 or send us an email and let us know what needs doing, and we’ll give you a clear price.
How often do external joints need resealing?
It depends on the exposure, the movement and the product. Treat it as a maintenance item and look at it yearly and reseal when it splits.
When is the sealant fully cured?
It depends on the product. Before we leave, we will tell you the cure time.
How do you reach high-level joints?
It depends on the building. We work on joints that can be reached safely. Tell us about the building and we will confirm what access is needed.
Are you fully insured?
Yes. Full insurance covers our work.
Will the new joint stand out?
The aim is a neat, even joint in a colour that suits the wall. We’ll talk through colour options before any work starts.
Why is there a gap in my brick wall?
A vertical gap in a long brick wall is usually a movement joint. It gives the wall room to move, and it should be sealed with a flexible sealant.
Honest limits
We will not take on work that won’t last, so these are the limits:
- Structural movement, which needs a surveyor or engineer
- Cracking across the wall rather than at a joint
- Loose or hollow render, which needs re-rendering
If in doubt, ring 0345 464 0079 or send us an email and we’ll say what we think.
Surfaces we seal
- Render & cladding joints
- Façade panels
- Copings & trims
- Brickwork movement joints
- Concrete & block
- Joints between brick and frames
Common problems we fix in Wennington
The wrong product in a moving joint is a classic cause. A stiff, general-purpose sealant cannot cope with a joint that moves a lot, so it pulls away from the edges.
Signs it’s time to call us include:
- Weathered mastic that no longer stretches
- Cracked joints where brick meets render or frames
- Damp patches traced to an open external joint
- Joints with sealant missing in places
For site and facilities teams at buildings such as Brady Primary School, its movement joints, gutters and trims need looking after like any other building’s.
Questions to ask before booking
- What happens if the job turns out different
- Whether they’re fully insured
- Whether the sealant suits the joint
- How the surfaces are prepared before sealing
DIY versus a professional finish
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
Looking after it afterwards
After the cure time, these simple habits help:
- Ask before painting over external sealant
- Do not let climbing plants root in the sealant
- Point out the joints to other trades
- Check external joints each spring
Give the sealant the cure time we tell you before anything rubs against it. Most exterior sealants skin fast but take longer to cure right through.
An open movement joint lets rain into the wall every time it pours. Over time it can mean damp inside, stained render or frost-damaged brick, all bigger jobs than a reseal.
The process
Good joint work is mostly preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. In total, it normally takes anything from a few hours to several days, depending on the building. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Wennington. A visitor permit or a nearby bay makes the visit run more smoothly.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- 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.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
How to prepare
- Let us know about stairs, lifts or work at height
- Let us know about parking restrictions
- Clear items away from the joints we are working on
How to get a quote
Want a quote for external mastic? Please ring 0345 464 0079 or send us an email with a few details. We’ll explain what we’d do and give you a clear quote before any work starts.
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Work for landlords, hotels and businesses
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.
We also work for property managers and facilities teams. Several sites can be quoted together, and we’re fully insured.