Greater London · England
External Mastic in Upper Ruxley
External mastic for Upper Ruxley, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Movement joints filled with mortar instead of sealant
- Weeds or debris growing in open joints
- Leaking joints around cladding and façade panels
Keeping the joints in good condition
Simple care keeps the joints in good condition. Our advice:
- Act on the first splits you see
- Make sure movement joints aren’t pointed over
- Don’t let climbing plants root in the sealant
- Avoid pressure-washing directly into sealant joints
Follow the cure time we give you before the joint is knocked or disturbed. The surface skins over quickly, but full cure takes longer.
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.
How we handle external mastic in Upper Ruxley
Low-level joints can generally be done from the ground. For joints higher up, give us some details of the building and we’ll confirm what’s needed to reach them safely. Typical jobs include joints where the bead has come unstuck and panel joints letting water in, on brickwork movement joints, façade panels and concrete & block.
London’s terraces and conversions often share walls, gutters and downpipes with their neighbours, so one failed joint can cause damp for more than one household. For a flat in Upper Ruxley, check the lease for who looks after the outside.
Each job carries a 12-month guarantee, whatever its size.
- Location
- Upper Ruxley (DA14)
- Region
- Greater London
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Nearby places to Upper Ruxley
Other services in Upper Ruxley
Work for landlords, hotels and businesses
We work for letting agents and landlords as well as householders. Resealing between tenancies is a simple way to keep a property in good order.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
What the job involves on each surface
Joints between dissimilar materials
Each side of the joint may need its own preparation. We prepare both faces so the sealant bonds properly.
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 coloured to suit the wall.
What external mastic looks like in Upper Ruxley
Historic houses like Hall Place and Gardens (about 2.7 miles north) are a reminder that the area around Upper Ruxley has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you live in an older home near St Botolph's Church, an extension built onto an older house moves differently, and the joint between them takes the strain. For site and facilities teams at buildings such as Hope Community School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Upper Ruxley is about 2 miles south-east of Sidcup, in Greater London. For external mastic in and around Upper Ruxley, it’s easy to get a quote: please call 0345 464 0079 or send us an email. We cover Greater London from our Crawley base, Upper Ruxley included. Upper Ruxley is one of 764 towns and villages in Greater London we cover. We also work in London, around 12 miles away.
Our applicators cover all of DA14 for external mastic and the streets around it. Streets in the area include Maidstone Road and Old Maidstone Road, all of which we cover. We also cover Ruxley (1 mile north-west), Hockenden (1 mile south-east), Stonehill Green (1 mile east), Foots Cray (1 mile west) and North Cray (1 mile north). Within a short drive, we also cover London (12 miles north-west), City of Westminster (15 miles north-west), Marylebone (14 miles north-west), St Pancras (14 miles north-west), Shoreditch (12 miles north-west) and Walthamstow (14 miles north-west).
Landmarks near Upper Ruxley
We work in homes and buildings around Kemnal Technology College and Foots Cray Meadows, among other places. The closest station to Upper Ruxley is Swanley station, roughly 1.7 miles south-east. Other landmarks nearby include Queen Mary's Hospital (1.8 miles west) and Eynsford Castle (4.2 miles south-east). Open spaces near Upper Ruxley include The Warren and Summer Hill.
What we’re called out for in Upper Ruxley
Buildings move more than people expect. 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 usually mention when they call are:
- Weathered mastic that no longer stretches
- Moss and dirt in joints with no sealant left
- Gaps where render, brick and frames meet
- Joints pointed up with cement by mistake
If you let a flat or house near Swanley station, outside joints that have cracked can let damp into a rental, so check them between lets.
Comparing quotes
- How long the guarantee is
- How much experience the applicator has
- When the joint can take water or movement
- What happens if the job turns out different
DIY versus a professional finish
Not every job suits DIY: 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 are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
Why act early in Upper Ruxley
Sealing over the top of old mastic does not hold for long. New sealant does not bond well to old, weathered sealant, so we always take the old sealant out. In a flat in Upper Ruxley, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please phone 0345 464 0079 or email us.
Why Upper Ruxley clients choose us
- Anti-fungal silicone where joints get wet
- We never seal over old sealant
- Rated 4.9 stars on Google
- Neat joints and a tidy finish
Take a look at our cost guide or customer reviews.
The process
On the day, there’s very little for you to do. Point us to the joints and we will get on with it. The job generally takes a few hours to a few days, depending on the length of joint and the access. In Upper Ruxley, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires 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
- Tell us about access, such as stairs, a lift or high-level joints
- For business premises, tell us about site rules or sign-in
- Tell us if parking is tricky
Get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. When it suits you, phone 0345 464 0079 or drop us an email.
Advice
Your questions about external mastic in Upper Ruxley
Do you cover Upper Ruxley for external mastic?
Yes. We work across London and the South East, and Upper Ruxley is part of that. Just phone 0345 464 0079 or send us an email with a few details of the job.
Can you help a landlord with a rental near Swanley station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just ring 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear price.
Do I need to be at home?
If the work is inside, we need someone to let us in. Once we have agreed the job, you do not need to watch us work.
What sealant do you use?
Each joint gets the product that suits it. Movement, water and weather all affect the choice.
Is there a guarantee?
Yes. Each job is guaranteed for twelve months, large or small.
Can you do several jobs on one visit?
Yes. Just list everything you need.
Are you an approved applicator?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
What information do you need?
Only a few details: where it is, what you’ve noticed and how we reach it. Then call 0345 464 0079 or send us an email.