North Lanarkshire · Scotland
Coltness External Mastic
External mastic in Coltness from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Brick movement joints where the sealant has split
- Weeds or debris growing in open joints
- Sealant that has lost its bond to the brick or render
About our external mastic in Coltness
Short cuts in external joints show up within a season or two. Overfilled joints, missing backing rod and sealant laid over old sealant rarely last long. We take the old material out and do it properly. We are often asked to deal with gaps where render, brick and frames meet and movement joints with cracked, split or missing sealant, on render & cladding joints, concrete & block and joints between brick and frames.
In and around a place like Coltness, many buildings face open ground and take the full weather. Gutter joints and wall joints take a battering, so they need a sealant that moves with the building.
A one-year guarantee comes as standard, so you’re covered after we’ve gone.
- Location
- Coltness (ML2, ML1)
- Wider area
- North Lanarkshire
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
What the job involves on each surface
Brickwork movement joints
Clay brickwork grows slightly over its life and moves with the weather. That movement goes into the joint, so its sealant has to stay flexible.
Copings and trims
Metal and stone copings both move with temperature, so a flexible sealant suits them best in all weathers.
Why act early in Coltness
Running new sealant over the old bead rarely lasts. The new layer can’t bond properly to old, weathered material, so we always take the old sealant out. Around Coltness, water from a failed joint in an older stone home can soak into timber and plaster.
Doing several joints on one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. You will get one clear quote for the whole job.
Why us?
- Fully insured
- Approved under the ARBOMaster scheme
- Experience in homes, commercial sites and hotels
- 4.9 on Google from 180+ five-star reviews
Read our cost guide or customer reviews.
Also near Coltness
What else we do in Coltness
Coltness buildings and the weather
Harled (roughcast) walls are common in Scotland, and joints where harling meets other materials need a sealant that can grip and flex. With historic houses such as Cambusnethan House (about 2.7 miles south-west) nearby, there’s older building stock in the area around Coltness 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.
Schools such as St. Aidan's Primary School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. Rented homes near Cleland station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Coltness is about 1 mile north of Wishaw, in North Lanarkshire. Homes, rented property, offices and hotels in Coltness is covered for external mastic, old or new, large or small. Every job comes with our 12-month guarantee. Our North Lanarkshire coverage runs to 89 places, Coltness among them. Glasgow is on our list too, around 15 miles away.
Here we cover the ML2 and ML1 postcode area for external mastic. If you need external mastic at a property on Banchory Road, Coltness Road and Linden Avenue or anywhere close by, we can help. Other places close to Coltness include Wishaw (1 mile south), Dimsdale (2 miles south), Pather (2 miles south), Netherton (2 miles south-west) and Ravenscraig (2 miles west). Within a short drive, we also cover Motherwell (3 miles west), Cumbernauld (12 miles north), Coatbridge (6 miles north-west), Airdrie (6 miles north-west), Bellshill (5 miles north-west) and Kilsyth (14 miles north-west).
Around Coltness
In Coltness, that means homes and buildings near Coltness High School and the streets around them. For rail, the closest station is Cleland station, about 1 mile north. A little further out are Murdostoun Castle (1.5 miles east) and Cleland Hospital (0.9 miles north). Open spaces near Coltness include Baron's Haugh RSPB Reserve and Allanton House lake.
Should I try it myself first?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
What affects the cost of external mastic
Every job gets its own quote. This is what makes a difference:
- Any working-time requirements on site
- The product the joint needs
- How many rooms, windows or areas are involved
- The size of the job
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
What to tell us for a quote
When you call or email, it’s useful to know:
- What the problem is, such as mould, gaps, leaks or cracking
- How many joints, rooms or windows are involved
- Whether it’s a home or a business
- Access, such as stairs, a lift or height
Every job is quoted individually, so the first step is telling us about yours. Simply email us at info@mrmastic.co.uk and describe the job and send pictures if you have them.
Signs you need external mastic in Coltness
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, so it pulls away from the edges.
If you can see any of these, it’s time to have the joints looked at:
- Failed sealant between panels on a façade
- Old sealant gone brittle and cracked
- Sealant that has lost its bond to the brick or render
- Rain getting behind render or cladding at a joint
Historic houses such as Cambusnethan House, about 2.7 miles south-west, show how far back building around Coltness goes.
Comparing quotes
- How much experience the applicator has
- How long the guarantee is
- Whether all the old sealant comes out first
- How long to leave it before use
What we do, step by step
You do not need to clear the whole room or building before we come, just the space around the work. Everything nearby is protected, and the work takes a few hours to a few days, depending on the length of joint and the access for a typical job. For a place like Coltness, longer drives are planned in advance. Mention tracks, gates, ferries or anything else about the route.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- Mention any parking rules near the property
- For business premises, tell us about site rules or sign-in
- Mention if the joints have been sealed before
How to get a quote
There’s no standard price list. Instead, your job gets its own clear quote. To get started, email us at info@mrmastic.co.uk.
Advice
Landlords, agents and businesses in Coltness
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
FAQs for Coltness
Can you do external mastic in Coltness?
Yes, Coltness is within the area we cover. We work across all of Scotland. You can email us at info@mrmastic.co.uk and let us know what needs doing, and we will give you a clear quote.
Can you help a landlord with a rental near Cleland station?
Yes, we work for landlords and letting agents. Just send an email to info@mrmastic.co.uk and tell us about the property, and we’ll give you a clear price.
How long does external mastic take?
Most jobs take a few hours to a few days, depending on the length of joint and the access. We will confirm how long when we quote.
Can you do several jobs on one visit?
Of course. Doing several areas at once is usually more efficient.
Is it messy?
Very little: the area around the joints is protected first, and we tidy up before we go.
When will the joints need doing again?
That depends on the wall, the weather and the movement. Signs to watch for are cracking, hardening and gaps at the edges and have them redone then.
What do you need from me for a quote?
Tell us what needs doing and where, plus pictures if you have them. If we need more, we’ll ask.
Why do you put foam in the joint first?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. That way it bonds to the two sides only and can stretch.