South Lanarkshire · Scotland
External Mastic in Crawfordjohn
Specialist external mastic for Crawfordjohn: careful preparation, the right product and tidy work. Call for a quick quote.
- Brick movement joints where the sealant has split
- Joints pointed up with cement by mistake
- Old sealant gone brittle and cracked
How we quote for external mastic
We do not publish a price list, because no two jobs are the same. What we look at:
- Mould in or behind the old joints
- The number and length of the joints
- The product the joint needs
- Working hours on commercial sites
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
What we need to know
What to tell us when you ask for a quote:
- What the problem is, such as mould, gaps, leaks or cracking
- Pictures of the joints, sent by email
- Where the job is, and your postcode
- The type of property
We do not publish a price list. Instead, your job gets its own clear quote. To get started, email us at info@mrmastic.co.uk.
About our external mastic in Crawfordjohn
External mastic is a job where short cuts show quickly. New sealant over old, joints packed with mortar and beads with no backing rarely last long. We strip the joint back and start again. If you’re dealing with failed sealant between panels on a façade and rigid filler in a joint that should flex, we can help, whatever the surface.
External sealant needs dry surfaces, so outdoor work around Crawfordjohn is planned around the weather, and longer journeys are planned in advance. Tell us how to reach each wall, gutter and roofline.
Each job carries a 12-month guarantee, whatever its size.
- Location
- Crawfordjohn (ML12)
- Region
- South Lanarkshire
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
More services for Crawfordjohn
How to look after the new joints
Aftercare is simple, and it makes a real difference:
- Leave the joints unpainted unless we have said otherwise
- Clear growth from the base of walls and joints
- Show decorators and builders where the movement joints are
- Keep high-pressure jets off the joints
Make sure anyone working on the wall later knows where the movement joints are. They should be kept open and resealed, not filled.
Small splits are the time to act. At that stage it’s a simple cut out and reseal before water has had years to get in.
Honest limits
Sealant is not the answer to every problem, and we will tell you before we start. Sealant will not put right:
- Rising or penetrating damp from elsewhere in the wall
- Cracks in the bricks or render themselves, away from the joints
- Subsidence or other structural problems
Not sure which it is? You can drop us a line at info@mrmastic.co.uk and we will tell you honestly.
Surfaces we seal
- Façade panels
- Joints between brick and frames
- Render & cladding joints
- Concrete & block
- Brickwork movement joints
- Copings & trims
External mastic in Crawfordjohn: local notes
Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and sound outside sealant is part of that. Harled (roughcast) walls are common in Scotland, and joints where harling meets other materials need a sealant that can grip and flex.
In and around Crawfordjohn, as anywhere, good external mastic starts with a clean, dry, properly prepared joint.
Crawfordjohn is about 16 miles south of Carluke, in South Lanarkshire. Jobs in Crawfordjohn get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Our South Lanarkshire coverage runs to 139 places, and Crawfordjohn is one of them. You can also see our page for Glasgow, about 32 miles away.
All of ML12 is covered for external mastic. That includes homes and businesses on Main Street, The Loaning and Cross Road and the roads around them. Nearby, we also carry out external mastic in Abington (3 miles east), Douglas (5 miles north-west), Roberton (5 miles north-east), Crawford (5 miles east) and Glespin (5 miles north-west). Larger places within reach include Lanark (12 miles north), Lesmahagow (11 miles north-west), Biggar (13 miles north-east), Kirkmuirhill (13 miles north-west), Blackwood (14 miles north-west) and Coalburn (8 miles north-west).
Near you in Crawfordjohn
A little further out are Crawfordjohn Heritage Venture (under half a mile south) and Lady Home Hospital (5 miles north-west).
Crawfordjohn questions
Is Crawfordjohn in your area for external mastic?
Yes, Crawfordjohn is within the area we cover. We work across all of Scotland. Just drop us a line at info@mrmastic.co.uk with a few details of the job, and we’ll send you a clear quote.
Is Crawfordjohn within the area you cover?
Yes, Crawfordjohn is covered. Our work covers the whole of Scotland, and smaller places are part of that. Longer journeys are simply planned in advance.
Do you use backing rod?
The foam is closed-cell backing rod. It stops the sealant going in too deep and bonding to three sides, which would stop it stretching.
What colours does the sealant come in?
We aim for a joint that suits the wall rather than one that jumps out. Colour is agreed with you before we begin from the range available.
Where do you work from?
We’re based in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
What is a movement joint?
Brickwork, render and cladding all move a little, so long walls have planned gaps to take that movement. The gap is sealed with a flexible sealant over backing rod.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status, and we’re fully insured.
Do you take out the old sealant first?
Yes. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Signs you need external mastic in Crawfordjohn
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.
Keep an eye out for these signs:
- Gaps where render, brick and frames meet
- Movement joints filled with mortar instead of sealant
- Joints where the bead has come unstuck
- Joints with sealant missing in places
Homes close to Crawfordjohn Parish Church include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain.
Questions to ask before booking
- Whether VAT is included
- Who does the work, and how experienced they are
- Is the old sealant removed completely?
- How the colour is chosen
DIY sealant or a professional job?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
If you’ve already had a go yourself, that’s fine. We cut it out and start again, so just mention it when you contact us.
How the job changes by surface
Brickwork movement joints
Brick walls have vertical movement joints to absorb expansion. They’re resealed over backing rod with a low-modulus sealant coloured to suit the wall.
Render joints
Render has movement joints and stop beads that need sealing. We reseal them with a flexible exterior sealant that suits the render colour.
What we do, step by step
Every visit runs the same way: we check the joints, protect the area around them, carry out the job and clear up. It usually takes a few hours for a handful of joints, longer for a whole elevation. Around Crawfordjohn, distance and access matter more than parking. Let us know how to find you and how to reach the joints.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- We cut out the failed sealant and rake out any dirt or growth.
- Both sides are cleaned back to sound material and primed if needed.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Preparing for the visit
- On commercial sites, let us know about site rules
- Mention any leaks or damp you’ve noticed
- Clear the area around the work
Get a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email photos if that’s easy.