Kent · England
External & façade joints in Westwood, Kent
Problem with your movement joints in Westwood? We cut out the old, prepare the joints and apply the right sealant.
- Damp patches traced to an open external joint
- Old sealant gone brittle and cracked
- Movement joints with cracked, split or missing sealant
External mastic in Westwood, done properly
Ground-floor and low-level joints are straightforward to reach. For joints higher up, give us some details of the building and we’ll confirm what access is needed. We work on copings & trims, façade panels and joints between brick and frames, and common reasons people get in touch are joints with sealant missing in places and rain getting behind render or cladding at a joint.
Around Westwood, older buildings can be stone, brick or timber-framed, many with extensions added later. Where one material meets another is where water generally gets in, and they need the right sealant at the right depth.
The work is covered for a year after we finish. If anything isn’t right with it, ring 0345 464 0079 or email us.
- Place
- Westwood (DA13, DA2)
- Wider area
- Kent
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Questions from Westwood
Is Westwood within the area you cover?
Yes. Westwood is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
I let a flat near Longfield 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 send you a clear quote.
Will the new joint stand out?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We choose the closest to your brick or render so the joint doesn’t draw the eye.
Can you work on commercial sites?
Yes, regularly. We can plan bigger jobs in stages.
What do you need from me for a quote?
Only a few details: the address or postcode, what’s wrong and any access issues. After that, simply ring 0345 464 0079 or send us an email.
Can you do several jobs on one visit?
Yes. Tell us about everything you’d like done and we’ll quote it together.
Is it OK to seal over old sealant?
No. Fresh sealant doesn’t stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Are you fully insured?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
Do you need external mastic in Westwood?
A lot of failed joints come down to preparation: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The sealant never bonds properly.
Most people get in touch after spotting one of these:
- Water getting into walls through failed joints
- Joints where the bead has come unstuck
- Moss and dirt in joints with no sealant left
- Cracked joints where brick meets render or frames
Managing a site like Bean Primary School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Comparing quotes
- Whether all the old sealant comes out first
- When the joint can take water or movement
- What the quote includes, VAT included or not
- What happens if they find a problem under the old sealant
Westwood buildings and the weather
Historic houses like Cobham College (about 4.6 miles east) are a reminder that the area around Westwood 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.
In the older streets around Church of Saint Mary Magdalene, older walls, gutters and the joints where extensions meet them need a flexible sealant. If you let a flat or house near Longfield station, split movement joints are easy to miss on a rental until damp shows inside.
Westwood is about 3 miles south of Swanscombe, in Kent. We provide external mastic to homes and businesses in Westwood and the surrounding area. 922 places in Kent are on our list. For nearby work, see our London page, about 18 miles away.
Postcode districts we cover here for external mastic: DA13 and DA2. Streets in the area include Westwood Road and Highcross Road. We also cover the places around Westwood: Grubb Street (1 mile south-west), Green Street Green (1 mile west), Bean (1 mile north-west), St Margarets (2 miles west) and Darenth (2 miles west). Within a short drive, we also cover Maidstone (14 miles south-east), Dartford (4 miles north-west), Sevenoaks (10 miles south-west), Gravesend (4 miles east), Tonbridge (15 miles south) and Northfleet (3 miles north-east).
What’s near Westwood
We work in homes and buildings around Longfield Academy, Longfield Chalk Bank and Railway Tavern, among other places. The nearest railway station is Longfield station, roughly 1 mile south of the centre. Nearby you will also find Stone Museum of Geology (3.3 miles north-west) and Bluewater (2.3 miles north-west). The countryside around Westwood includes Sawyers Lake.
Work for landlords, hotels and businesses
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Housing providers, facilities teams and property managers book us too. Several sites can be quoted together.
What we do, step by step
There is not much for you to do on the day. Point us to the joints and we’ll get on with it. The work itself takes anything from a few hours to several days, depending on the building, including the tidy-up. For a village or hamlet like Westwood, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- The old mastic and anything lodged in the joint is removed.
- The joint faces are cleaned and primed where the sealant needs it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Preparing for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Mention any leaks or damp you’ve noticed
- Move anything stored near the joints
Ask for a quote
To get a quote, ring 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. We will give you a clear quote before any work starts.
Read more
Surface by surface
Joints between dissimilar materials
Different materials may need different primers. We prepare both faces so the sealant bonds properly.
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.
How to look after the new joints
To keep the joints looking good and working properly:
- Avoid pressure-washing directly into sealant joints
- Have failed joints looked at early
- Keep movement joints as flexible joints, not mortar
- Point out the joints to other trades
Avoid pressure-washing straight into the joints. High-pressure water can lift the edges over time.
Once a joint cannot move, the wall finds another way, normally as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
Why it’s worth doing now in Westwood
It often makes sense to reseal all the failing joints on an elevation together. Joints of the same age tend to fail together and it means sorting access once. Where a wall is exposed, as many are in small places like Westwood, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Doing several joints on one visit usually makes better use of the time than several visits, so tell us about everything that needs sealing. You’ll get one clear quote for the whole job.
Why Westwood customers choose us
- Neat joints and a tidy finish
- A choice of colours where the product allows
- 4.9 on Google from 180+ five-star reviews
- Any old sealant cut out fully, not covered over
See our cost guide and what customers say.
Other services in Westwood
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.