Kent · England
External & façade joints in Cobham, Kent
Movement joints in Cobham need attention? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Joints pointed up with cement by mistake
- Sealant that has lost its bond to the brick or render
- Damp patches traced to an open external joint
What happens if it’s left?
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That matters on brick, render and concrete, which can be weaker at the face. Too stiff a sealant can pull at the edges and break them. In a small place like Cobham, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
Doing several joints on one visit is usually more efficient than separate visits. You’ll get one clear quote for the whole job.
Why us?
- You choose the colour before work begins
- Anti-fungal sanitary silicone in wet areas
- We are fully insured
- A 12-month guarantee on all work
Read our cost guide and our reviews.
External mastic for homes and businesses in Cobham
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible sealant bridges the two where mortar or filler would crack. Common call-outs are for cracked joints where brick meets render or frames and plants rooting in failed movement joints, on joints between brick and frames, render & cladding joints and concrete & block.
Older homes in small places like Cobham may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water normally gets in, and they need the right sealant at the right depth.
The work is covered for a year after we finish. If there’s a problem with it, please ring 0345 464 0079 or email us.
- Where
- Cobham (DA12)
- Wider area
- Kent
- Cover
- 12 months on all our work
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Landlord and commercial work in Cobham
We work for letting agents and landlords as well as homeowners. Sealant work between tenants keeps a property looking cared for before the next move-in.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we’ll quote.
What affects the quote in Cobham
We don’t publish a price list. What we look at:
- Whether there’s mould to deal with
- Any working-time requirements on site
- The type of sealant required
- How easy the joints are to reach
Leaving a failed joint normally makes the job bigger, not smaller. If you’re unsure, call 0345 464 0079 or send us an email and we’ll give you an honest view and a quote.
What to tell us for a quote
Before you ask for a quote, have a think about:
- Whether it’s a home or a business
- What the problem is, such as mould, gaps, leaks or cracking
- Where the job is, and your postcode
- A few photos by email, if you can
Need a quote? Please call 0345 464 0079 or drop us an email and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
Signs you need external mastic in Cobham
Buildings move more than people expect. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. The sealant in the movement joints takes that strain.
It’s worth asking for a quote if you see:
- Rigid filler in a joint that should flex
- Rain getting behind render or cladding at a joint
- Weathered mastic that no longer stretches
- Leaking joints around cladding and façade panels
If you let a flat or house near Sole Street station, split movement joints are easy to miss on a rental until damp shows inside.
Questions to ask before booking
- What product goes in the joint
- What guarantee comes with the work
- How much experience the applicator has
- How hidden problems are handled
Questions from Cobham
Do you cover smaller places like Cobham?
Yes. Cobham is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you cover Cobham for external mastic?
Yes. We work across London and the South East, and Cobham is part of that. You can call 0345 464 0079 or email us and tell us what needs doing.
Where is Mr Mastic based?
Our base is Crawley, with over 20 years’ experience. Our area covers South East England, London and Scotland.
Is there any odour?
It depends on the product. Some products have a noticeable smell, others very little.
I rent my home. Can I book you?
Yes. Ask your landlord first, and we can send them the quote if that helps.
What should I tell you?
Just the basics: the address or postcode, what’s wrong and any access issues. Then ring 0345 464 0079 or email us.
What’s an expansion joint in brickwork?
A vertical gap in a long brick wall is usually a movement joint. It gives the wall room to move.
How long does external mastic last?
It varies from wall to wall: sunny, exposed elevations and busy joints wear faster. A yearly look will tell you when they need doing. Our work comes with a 12-month guarantee.
What external mastic looks like in Cobham
Historic houses like Cobham College (about 0.2 miles south-west) are a reminder that the area around Cobham 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. 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.
If you live in an older home near Parish Church of St Mary Magdalene, the joints between older walls, newer extensions and the roofline need a sealant that can move. Managing a site like Cobham Primary School? Then larger buildings have long runs of movement joint that eventually need resealing.
Cobham is about 3 miles south of Gravesend, in Kent. Homes, rented property, offices and hotels in Cobham can book us for external mastic. Every job comes with our 12-month guarantee. We cover 922 towns and villages across Kent, from the larger towns to small villages. Our London page covers work nearby.
All of DA12 is covered for external mastic, from the main roads to the quietest streets. External mastic is available to properties on The Street, Lawrence Drive and Cobhambury Road. Close by, we work in Upper Bush (2 miles south-east), Lower Bush (2 miles south-east), Cuxton (2 miles south-east), North Halling (3 miles south-east) and Upper Halling (3 miles south). Larger places within reach include Maidstone (10 miles south-east), Sittingbourne (15 miles east), Dartford (8 miles north-west), Sevenoaks (12 miles south-west), Gravesend (3 miles north) and Tonbridge (14 miles south).
What’s near Cobham
We work in homes and buildings around Thamesview School, The Ship Inn and Jeskyns. The closest station to Cobham is Sole Street station, about 1.2 miles south-west. Other landmarks nearby include Rochester Castle (4.3 miles east) and Gravesham Community Hospital (3.9 miles north-west). For a walk, there’s Gad's Hill and Ranscombe Farm.
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Ask before painting over external sealant
- Keep high-pressure jets off the joints
- Fix overflowing gutters above sealed joints
- Keep movement joints as flexible joints, not mortar
Look over the joints once a year, ideally after winter. Splits, gaps at the edges or plants in the joint are early warning signs.
Leaks behind façade panels and render often go unseen. When it finally shows inside, the joint may have been open for years so early resealing is worth it.
What happens on the day
On the day, we start by going over the job with you, so you know exactly what we are doing. Surfaces next to the work are protected before any work starts. Most jobs take a few hours to a few days, depending on the length of joint and the access. In a small place like Cobham, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
Getting ready for the visit
- Let us know about earlier repairs to the joints
- Move anything stored near the joints
- Keep children and pets away from the work area
Ask for a quote
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we’ll explain what’s involved and send you a clear quote.
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Towns and villages near Cobham
More services for Cobham
When it is not the sealant
Before you book, it’s worth knowing the limits too:
- Adding movement joints to masonry that has none
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Movement that is more than a sealant joint can take
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly.
Surfaces we seal
- Façade panels
- Concrete & block
- Brickwork movement joints
- Copings & trims
- Joints between brick and frames
- Render & cladding joints