Argyll and Bute · Scotland
External Mastic in Rothesay
External mastic across Rothesay and nearby, with every bit of old sealant taken out first.
- Failed seals between different materials
- Weeds or debris growing in open joints
- Rain getting behind render or cladding at a joint
About our external mastic in Rothesay
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible exterior sealant takes up that movement where mortar or filler would crack. Typical jobs include sealant pulling away from one side of the joint and cracked joints where brick meets render or frames, across joints between brick and frames, render & cladding joints and façade panels.
Stone walls need a stone-friendly sealant, as acetoxy products can attack some stone. On newer homes, the movement joints and roofline trims are what need watching.
The work is covered for a year after we finish. If there’s a problem with it, please email us at info@mrmastic.co.uk.
- Place
- Rothesay (PA20)
- Wider area
- Argyll and Bute
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Rothesay: your questions answered
Does the coastal weather in Rothesay affect outside sealant?
Near the sea, outside joints face more wind, rain and salt than they would inland, so preparation and the right sealant matter all the more. It’s worth checking the walls that face the sea first.
Can you do external mastic in Rothesay?
Yes, Rothesay is within the area we cover. Our work covers the whole of Scotland. You can email us at info@mrmastic.co.uk and tell us what needs doing, and we’ll give you a clear price.
Do you work for letting agents?
Yes. We work in homes, commercial premises and hotels, and we are fully insured.
What colours does the sealant come in?
Exterior sealants are made in a range of colours, from greys and browns to whites and stone shades. We choose the closest to your brick or render so the joint doesn’t draw the eye.
Where is Mr Mastic based?
Our base is Crawley. We work across South East England, London and Scotland.
How long should I leave it?
That depends on the sealant used, so follow the cure time we give you when we finish.
What is a movement joint?
Most straight vertical gaps in brickwork are movement joints. It gives the wall room to move, and it should be sealed with a flexible sealant.
How long does external mastic take?
A typical job takes a few hours for a handful of joints, longer for a whole elevation. We’ll confirm how long when we quote.
Rothesay buildings and the weather
Rothesay is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. The west of Scotland is wetter than the east, which means movement joints and outside wall joints has to cope with a lot of rain.
Schools such as Rothesay Academy are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
Rothesay is about 13 miles south-west of Greenock, in Argyll and Bute. Rothesay gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Our Argyll and Bute coverage runs to 118 places, Rothesay among them. For nearby work, see our Glasgow page.
Jobs for external mastic in PA20 is quoted and booked the same way as anywhere else. Whether your property is on High Street, Ladeside Place and Ladeside Street or a nearby road, we can help. Being close to the A844 and B878, Rothesay is simple for us to get to for external mastic. If you’re just outside Rothesay, we cover Craigmore (1 mile east), Ardbeg (1 mile north), Port Bannatyne (2 miles north), Toward (4 miles north-east) and Innellan (5 miles north-east). Larger places within reach include Dunoon (10 miles north-east), An Tairbeart (14 miles west) and Sandbank (11 miles north-east). Rothesay is one of the larger places we cover in Argyll and Bute. Island and remote addresses take a little more planning, so tell us where you are when you ask for a quote.
Local landmarks in Rothesay
Typical jobs here are in homes near Golfers Bar and the streets around them. A little further out are Rothesay Castle (within half a mile east) and Victoria Hospital (within half a mile south). For a walk, there’s Kames Hill and Greenan Loch.
What we do, step by step
On the day, we look over the joints with you first, so you know exactly what we’re doing. Surfaces next to the work are protected before we start. Most jobs take anything from a few hours to several days, depending on the building. Around Rothesay, distance and access matter more than parking. Let us know how to find you and how to reach the joints, and the visit is planned around that.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- Old sealant and any debris are cut and raked out.
- The joint faces are cleaned and primed where the sealant needs it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Preparing for the visit
- Mention any leaks or damp you’ve noticed
- For indoor joints, keep the area dry beforehand if you can
- Clear the area around the work
Get a quote
Every job is quoted individually. Just drop us a line at info@mrmastic.co.uk with the details.
Related advice
Why deal with it now?
Sealing over the top of old mastic does not hold for long. New sealant does not bond well to old, weathered sealant, so the old joint is cut out fully first. Out of town in Scotland, exposed walls take a lot of weather, and once water gets behind a failed joint, damp in stone or harled walls is slow to dry out.
We don’t show prices on the website, because the cost depends so much on the job itself. For a quick quote, please email us at info@mrmastic.co.uk.
What you get with us
- Anti-fungal sanitary silicone in wet areas
- We never seal over old sealant
- Colour picked to suit the job
- Neat joints and a tidy finish
Take a look at how sealant jobs are priced and what customers say.
Do you need external mastic in Rothesay?
Some movement joints have been pointed up with mortar, often by someone who didn’t know what it was for. The joint cannot move, so the wall cracks somewhere else instead.
Look out for any of the following:
- Damp patches traced to an open external joint
- Joints with sealant missing in places
- Movement joints filled with mortar instead of sealant
- Gaps where render, brick and frames meet
Homes close to St Andrews R.C. Church Hall include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
What your quote should include
- Is VAT in the price?
- Who does the work, and how experienced they are
- How long to leave it before use
- How long the guarantee is
Landlord and commercial work in Rothesay
We work for letting agents and landlords as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order before the next move-in.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will give you a quote.
What we can’t put right
It helps to know what we can’t do too:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Subsidence or other structural problems
- Walls that need new movement joints cut into them
If you’re not sure, just send an email to info@mrmastic.co.uk and we will give you a straight answer.
Where we work in Rothesay
- Concrete & block
- Copings & trims
- Joints between brick and frames
- Render & cladding joints
- Brickwork movement joints
- Façade panels
Can I do it myself?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
How to look after the new joints
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Tell anyone working on the walls about the movement joints
- Check the sealant is paintable before painting near it
- Have failed joints looked at early
- Walk round the building once a year and look at the joints
Give the sealant the cure time we tell you before anything rubs against it. Most exterior sealants skin fast but take longer to cure right through.
Water getting behind cladding or render can go unnoticed for a long time. When it finally shows inside, the joint may have been open for years so early resealing is worth it.