Kent · England
Sibertswold External Mastic
External mastic for Sibertswold, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Movement joints with cracked, split or missing sealant
- Leaking joints around cladding and façade panels
- Joints where the bead has come unstuck
Why act early in Sibertswold
Done well, a resealed joint is a neat, straight line that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner so it’s worth doing right. In a small place like Sibertswold, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference.
What you get with us
- White, clear, grey or another colour, product permitting
- Sealant colour chosen to suit
- You choose the colour before work begins
- Old sealant always removed completely
Take a look at our cost guide and customer reviews.
External mastic in Sibertswold, done properly
Movement joints let brickwork, render and cladding expand and shrink without cracking. 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. Common call-outs are for panel joints letting water in and sealant pulling away from one side of the joint, across render & cladding joints, façade panels and brickwork movement joints.
Older homes in small places like Sibertswold may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water generally gets in.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we will put it right.
- Location
- Sibertswold (CT15)
- Wider area
- Kent
- Guarantee
- 12 months on all our work
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Sibertswold questions
Do you work for landlords with property near Shepherds Well station?
Yes. We work for landlords and agents as well as householders. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Is Sibertswold in your area for external mastic?
Yes. We work across London and the South East, and Sibertswold is part of that. Just call 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear quote.
How long does external mastic last?
It varies with how exposed the wall is and how much the joint moves. Signs to watch for are cracking, hardening and gaps at the edges and have them redone then.
Do you have insurance?
Yes. Mr Mastic is fully insured, and we’ve been doing sealant work for more than 20 years.
Where are you based?
We work from Crawley. We cover Sibertswold and the rest of Kent, along with the rest of our area.
Will there be a smell?
That depends on the sealant. Some smell for a while, some hardly at all, and any smell fades as they cure.
Will it make a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
Does someone need to be in?
We need access to the joints, so we will agree that with you when we book. Indoors, that usually means someone at home.
How we quote for external mastic
Call for a quick quote. What matters most is:
- Any working-time requirements on site
- How many areas need sealing
- The size of the job
- How much old sealant there is and how hard it is to remove
Combining jobs into one visit usually makes better use of the time than several visits, so tell us about everything that needs sealing. We will give you a clear quote for the lot.
Helping us quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- Pictures of the joints, sent by email
- Roughly how big the job is
- Access, such as stairs, a lift or height
- Whether it’s a home or a business
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we will explain what’s involved before giving you a price.
Nearby places to Sibertswold
Other services in Sibertswold
What we cannot put right
Before you book, it’s worth knowing the limits:
- Rising or penetrating damp from elsewhere in the wall
- Structural movement, which needs a surveyor or engineer
- Cracking across the wall rather than at a joint
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly.
Joints and surfaces we work on
- Concrete & block
- Copings & trims
- Façade panels
- Render & cladding joints
- Brickwork movement joints
- Joints between brick and frames
Should I try it myself first?
A DIY attempt does not rule out a professional job. We cut it out and start again, so just mention it when you contact us.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Do you need external mastic in Sibertswold?
Using the wrong sealant is another common reason. A stiff, general-purpose sealant can’t cope with a joint that moves a lot, so it pulls away from the edges.
Any of these means the joints need attention:
- Failed seals between different materials
- Sealant that has lost its bond to the brick or render
- Panel joints letting water in
- Joints pointed up with cement by mistake
Letting a property close to Shepherds Well station? Then split movement joints are easy to miss on a rental until damp shows inside.
What your quote should include
- What the quote includes, VAT included or not
- How the surfaces are prepared before sealing
- Who does the work, and how experienced they are
- Which colour the sealant will be
What the job involves on each surface
Concrete and blockwork
Concrete faces can be dusty and porous, so preparation is key. A primer goes on where the product requires one.
Copings and trims
Metal and stone copings both move with temperature, so the joints need a sealant that stays flexible in all weathers.
What happens on the day
We work through the job in order: protection first, then preparation, sealing and a tidy-up. Typically it takes anything from a few hours to several days, depending on the building and we leave things clean and tidy. Somewhere like Sibertswold needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Getting ready for the visit
- Clear the area around the work
- Where the joints are inside, avoid wetting them before we arrive
- Plan for the work area to be out of bounds to pets and children
Ask for a quote
There’s no standard price list, because every job is different. Instead, your job gets its own clear quote. To get started, ring 0345 464 0079 or send us an email.
Advice
What external mastic looks like in Sibertswold
With historic houses such as Goodnestone Park (about 3.9 miles north) nearby, there’s older building stock in the area around Sibertswold as well as newer homes. 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, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Homes close to Church of St Andrew include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant.
Sibertswold (also: Shepherdswell) is about 4 miles north-west of Dover, in Kent. Wherever you are in the CT15 postcode area, our applicators can take on external mastic. Sibertswold is one of 922 places in Kent where we work for external mastic. Our Chelmsford page covers work nearby, about 50 miles away.
Here we cover the CT15 postcode area for external mastic. Streets in the area include Station Road, Hill Avenue and Eythorne Road, all of which we cover. Nearby, we also carry out external mastic in Halfway Street (1 mile south-west), Coldred (1 mile south-east), Waldershare (1 mile east), Eythorne (2 miles north-east) and Lydden (2 miles south). Within a short drive, we also cover Canterbury (9 miles north-west), Margate (15 miles north-east), Dover (4 miles south-east), Folkestone (8 miles south), Ramsgate (13 miles north-east) and Broadstairs (15 miles north-east).
Landmarks near Sibertswold
In Sibertswold, that means homes and buildings near The Bricklayers' Arms. There’s a railway station in Sibertswold itself: Shepherds Well station. A little further out are Dover Transport Museum (3.6 miles south-east) and Buckland Hospital (4.6 miles south-east).