East Renfrewshire · Scotland
External Mastic in Clarkston
Specialist external mastic for Clarkston: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Movement joints filled with mortar instead of sealant
- Weeds or debris growing in open joints
- Water getting into walls through failed joints
How to look after the new joints
To keep the joints looking good and working properly:
- Keep water from gutters off the wall
- Have failed joints looked at early
- Keep high-pressure jets off the joints
- Check the sealant is paintable before painting near it
Keep the joints clear of soil, plants and climbing growth. Anything that holds water against the joint wears it out sooner.
Leaks behind façade panels and render often go unseen. When it finally shows inside, the joint may have been open for years.
How we handle external mastic in Clarkston
Short cuts in external joints show up within a season or two. New sealant over old, joints packed with mortar and beads with no backing rarely last long. We take the old material out and do it properly. We work on copings & trims, brickwork movement joints and joints between brick and frames, and the jobs we see most are sealant pulling away from one side of the joint and cracked joints where brick meets render or frames.
Scottish weather is hard on outside joints, and a town like Clarkston gets its share of wind and rain. Gaps in gutter joints, fascias and wall joints are where damp starts.
The work is covered for a year after we finish. If there’s a problem with it, please drop us a line at info@mrmastic.co.uk.
- Location
- Clarkston (G76, G77, G46)
- Region
- East Renfrewshire
- Cover
- A year, on every job
- Quotes
- A clear price before work begins
- info@mrmastic.co.uk
- Updated
- 26 October 2026
What we do, step by step
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The job generally takes anything from a few hours to several days, depending on the building from start to finish. For a job in Clarkston, tell us where the work is, how to get in and where to park. Outdoor jobs need a dry day, so they can move if the weather turns.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- 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.
How to prepare
- Plan for the work area to be out of bounds to pets and children
- Mention any sign-in or site rules at work premises
- Tell us about access, such as stairs, a lift or high-level joints
Ask for a quote
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.
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When it is not the sealant
We’d rather tell you now than do work that won’t last, so here’s what sealant cannot put right:
- Adding movement joints to masonry that has none
- Movement that’s more than a sealant joint can take
- Loose or hollow render, which needs re-rendering
If in doubt, drop us a line at info@mrmastic.co.uk and we will say what we think.
What we seal
- Concrete & block
- Façade panels
- Copings & trims
- Brickwork movement joints
- Joints between brick and frames
- Render & cladding joints
When to call us in Clarkston
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, and it tears off the sides.
It’s worth asking for a quote if you see:
- Brick movement joints where the sealant has split
- Leaking joints around cladding and façade panels
- Moss and dirt in joints with no sealant left
- Water getting into walls through failed joints
In the older streets around Greenbank Parish Church, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Comparing quotes
- What guarantee comes with the work
- What preparation is included
- Which colour the sealant will be
- What insurance they hold
Your questions about external mastic in Clarkston
Do you work for landlords with property near Clarkston station?
Yes, we work for landlords and agents. Just drop us a line at info@mrmastic.co.uk and tell us about the property, and we’ll send you a clear quote.
What guarantee comes with external mastic in Clarkston?
All our work, in Clarkston and everywhere else, comes with a 12-month guarantee. We are also fully insured and ARBOMaster approved.
Do you remove the old sealant?
Yes. Sealing over the old bead is the commonest cause of early failure, so we never do it.
What’s an expansion joint in brickwork?
Most straight vertical gaps in brickwork are movement joints. It gives the wall room to move and needs a flexible seal, not mortar.
How often do external joints need resealing?
That depends on the wall, the weather and the movement. Look for splits, hardening or edges coming away and have them redone then.
Can you seal over the old sealant?
No, and we never do. It can look neat for a few weeks, but the new layer lifts away from the old one. The old sealant has to come out completely.
Do I have to be there?
We need access to the joints, so we will agree that with you when we book. For inside work, that normally means someone being in.
Is it messy?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
For landlords and businesses
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
How the job changes by surface
Render joints
Render is weaker at the surface than brick, so a sealant that stretches easily protects the edges. We prime where the product needs it.
Copings and trims
Copings expand and contract through the day, so the joints need a sealant that stays flexible year round.
Clarkston buildings and the weather
Private landlords in Scotland must meet the Repairing Standard, which includes keeping a home wind and watertight, and sound outside sealant is part of that. Clarkston is in the west of Scotland, which is wetter than the east, so there’s plenty of rain for movement joints and outside wall joints to keep out.
Managing a site like Belmont House School? Then larger buildings have long runs of movement joint that eventually need resealing. For landlords with property near Clarkston station, split movement joints are easy to miss on a rental until damp shows inside.
Clarkston is about 4 miles north-west of East Kilbride, in East Renfrewshire. We carry out external mastic for householders, landlords and businesses in Clarkston, as part of our work across East Renfrewshire. Across East Renfrewshire, we cover 17 places, and Clarkston is one of them.
Every address in G76, G77 and G46 is within our area for external mastic, from the main roads to the quietest streets. External mastic is available to properties on Golf Road, Bull Road and Broom Road. Clarkston sits on or near the A727, which makes travel easy. Other places close to Clarkston include Millerston (1 mile south-east), Busby (1 mile east), Stamperland (1 mile north-east), Giffnock (1 mile north) and Waterfoot (1 mile south). Within a short drive, we also cover Barrhead (4 miles west), Arthurlie (4 miles west), Neilston (5 miles west), Auchenback (4 miles west), Eaglesham (3 miles south) and Nitshill (3 miles north-west).
What’s near Clarkston
Locally, jobs take us to homes and businesses close to Overlee Playing Fields and Mearns Castle High School, among other places. The nearest railway station is Clarkston station, about 0.8 miles north-east of the centre. Nearby you will also find Scottish Football Museum (3.4 miles north-east) and Hairmyres Hospital (3 miles south-east). For a walk, there’s Cathkin Braes and Brother Loch.
Should I try it myself first?
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.