South Lanarkshire · Scotland
External Mastic in Biggar
Movement joints in Biggar need attention? We remove the old material, prepare the joints and seal them properly, with a 12-month guarantee.
- Plants rooting in failed movement joints
- Old sealant gone brittle and cracked
- Movement joints with cracked, split or missing sealant
What happens if it’s left?
Pointing a movement joint with mortar might seem a neat fix, but it locks the joint solid. The movement then cracks the brickwork or render nearby. A flexible sealant over backing rod is what the joint needs. Exposed walls in smaller Scottish places take a lot of wind and rain, and once water gets behind a failed joint, damp in stone or harled walls is slow to dry out.
What you pay reflects the work, not a rough estimate. That’s why we ask a few questions first and send you a clear quote before work begins.
Why Biggar clients choose us
- Colour agreed with you before work begins
- Neat joints and a tidy finish
- Rated 4.9 stars on Google
- Old sealant always removed completely
Read how sealant jobs are priced and our reviews.
External mastic for homes and businesses in Biggar
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. The colour is chosen to suit the brick or render so the joint doesn’t stand out. We work on render & cladding joints, joints between brick and frames and copings & trims, and people most often call us about panel joints letting water in and sealant pulling away from one side of the joint.
In and around a place like Biggar, many buildings face open ground and take the full weather. Gutter joints and wall joints take a battering.
You get a 12-month guarantee, the same in Biggar as everywhere else we work.
- Place
- Biggar (ML12)
- Wider area
- South Lanarkshire
- Cover
- One year on every job
- Price
- Quoted before any work starts
- info@mrmastic.co.uk
- Updated
- 26 October 2026
External mastic in Biggar: 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 where harling meets frames, pipes and other materials, the joint needs a flexible sealant that grips a rough surface.
If you live in an older home near Biggar Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
Biggar is about 14 miles south-east of Carluke, in South Lanarkshire. For external mastic in and around Biggar, it’s easy to get a quote: please drop us a line at info@mrmastic.co.uk. We are based in Crawley and cover South Lanarkshire. We cover 139 towns and villages across South Lanarkshire, from the larger towns to small villages. Edinburgh is on our list too, around 25 miles away.
We work across ML12 for external mastic. If you need external mastic at a property on High Street, Langvout Square and Market Road or a nearby road, our applicators can take on the job. Being close to the A702 and B7016, Biggar is easy for our applicators to reach for external mastic. If you are just outside Biggar, we cover Skirling (3 miles north-east), Coulter (3 miles south), Quothquan (3 miles north-west), Candy Mill (3 miles north-east) and Symington (3 miles south-west). We also work in nearby towns such as Carluke (14 miles north-west), Lanark (10 miles west), Lesmahagow (14 miles west), Forth (12 miles north-west), Douglas (13 miles west) and Coalburn (14 miles west).
Around Biggar
We work in homes and buildings around Little Mitchellwood and the streets around them. A little further out are Biggar Castle (less than half a mile west) and Biggar Albion Museum (less than half a mile north). Green spaces nearby include Chapelgill Hill.
Looking after it afterwards
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Make sure movement joints are not pointed over
- Get split or bare joints resealed while the damage is small
- Deal with leaking gutters that soak the joints below
- Ask before painting over external sealant
Don’t paint over the new sealant unless we have said the product is paintable. Many exterior sealants are not designed to be painted, and paint can crack as the joint moves.
Leave a failed movement joint and water keeps getting into the wall. Over time it can mean damp inside, stained render or frost-damaged brick, all bigger jobs than a reseal.
More services for Biggar
DIY versus a professional finish
A careful DIYer can reseal a simple joint, 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.
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.
Different surfaces, different methods
Render joints
Rendered walls have joints at beads, openings and changes of material. We reseal them with a flexible exterior sealant that suits the render colour.
Cladding and façade panels
Panel systems often rely on sealant between and around the panels. We reseal them with a sealant suited to the panel material.
How the visit works
Every visit runs the same way: we check the joints, protect the area around them, carry out the job and tidy away. Most jobs take anything from a few hours to several days, depending on the building. In smaller Scottish places, parking is generally less of an issue than access and distance. Tell us how to find the property and how to reach the work, and the visit is planned around that.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- 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
- Keep children and pets away from the work area
- Clear items away from the joints we are working on
- Let us know about stairs, lifts or work at height
Ask for a quote
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we will talk you through the work and send you a clear quote.
Related advice
Your questions about external mastic in Biggar
What guarantee comes with external mastic in Biggar?
Every job comes with our 12-month guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Is Biggar within the area you cover?
Yes. Biggar is within the area we cover, which takes in towns, villages and rural addresses. Our work covers the whole of Scotland. Just mention lanes, gates or anything else about the route when you book.
What sealant do you use?
Products from Arbo and Everbuild, among others, picked for each joint. We will tell you what we are using and why.
Are you fully insured?
Yes. We are fully insured.
Can you quote for more than one area?
Yes. More than one area can be quoted together.
Can you reach joints on upper floors?
It depends on the building. Send us photos and a rough idea of the height, and we will confirm what access is needed.
What information do you need?
A short description and the location, with photos by email if possible. If we need more, we will ask.
Does someone need to be in?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
What affects the quote in Biggar
The quote reflects the job in front of us. We take into account:
- When we can work, for business premises
- Access and height
- How many rooms, windows or areas are involved
- The old material and how stubborn it is
A few things move the cost up or down: the old material and how easily it comes out, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
What we need to know
To help us quote quickly, please include:
- Any access issues, like height or stairs
- Roughly how big the job is
- If someone has resealed it before
- The problem you’ve noticed
Getting a quote is simple: let us know the job and the location, and roughly how big it is. A few pictures by email make the job easier to understand, and we’ll come back to you with a quote.
When to call us in Biggar
Many joints fail because they were sealed too deep or with nothing behind them. If the sealant sticks to the back as well as the sides, it can’t stretch and rips as the joint opens.
Keep an eye out for any of the following:
- Failed sealant between panels on a façade
- Failed seals between different materials
- Joints pointed up with cement by mistake
- Weeds or debris growing in open joints
For site and facilities teams at buildings such as Biggar High School, larger buildings have long runs of movement joint that eventually need resealing.
Questions to ask before booking
- What happens if they find a problem under the old sealant
- How the joint is cleaned and prepared
- Who turns up on the day
- How long to leave it before use