Argyll and Bute · Scotland
Portnahaven External Mastic
Sealing brickwork movement joints, render, cladding and façade joints in Portnahaven, with a 12-month guarantee on every job. Call for a quick quote.
- Sealant that has lost its bond to the brick or render
- Weathered mastic that no longer stretches
- Gaps where render, brick and frames meet
External mastic in Portnahaven, done properly
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Porous or awkward surfaces are primed where the sealant needs it and we use one wherever it does. Typical jobs include weathered mastic that no longer stretches and weeds or debris growing in open joints, on joints between brick and frames, concrete & block and copings & trims.
External sealant needs dry surfaces, so outdoor work around Portnahaven is planned around the weather. Tell us how to reach each wall, gutter and roofline.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Where
- Portnahaven (PA47)
- Region
- Argyll and Bute
- Guarantee
- 12 months on all our work
- Price
- A clear price before any work starts
- info@mrmastic.co.uk
- Updated
- 26 October 2026
Outside joints around Portnahaven
Portnahaven is within about 1 mile of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. Harled (roughcast) walls are common in Scotland, and joints where harling meets other materials need a sealant that can grip and flex.
Homes close to Portnahaven Church include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain. Around Portnahaven, as everywhere, external mastic is only as good as the preparation behind it.
Portnahaven (Gaelic: Port na h-Abhainne) is in Argyll and Bute. We provide external mastic to homes and businesses in Portnahaven and nearby, as part of our work across Argyll and Bute. Portnahaven is one of 118 towns and villages in Argyll and Bute where we work.
Every address in PA47 is covered for external mastic, from the main roads to the quietest streets. Whether your property is on High Street, Shore Street and Church Street or a nearby road, we can help. Nearby, we also carry out external mastic in Bun Othan (1 mile south), Port Charlotte (6 miles north-east), Bowmore (10 miles north-east), Imeraval (12 miles east) and Port Ellen (13 miles east). If you’re somewhere remote, the job takes a little more planning.
Local landmarks in Portnahaven
The countryside around Portnahaven includes Beinn Tart a' Mhill.
What we cannot put right
It helps to know what we cannot do too:
- Cracked brickwork or render that needs a builder or plasterer
- Adding movement joints to masonry that has none
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
If in doubt, drop us a line at info@mrmastic.co.uk and we’ll say what we think before booking.
Surfaces we seal
- Render & cladding joints
- Concrete & block
- Brickwork movement joints
- Façade panels
- Copings & trims
- Joints between brick and frames
Nearby places to Portnahaven
More services for Portnahaven
Why deal with it now?
An open joint keeps letting water into the wall with every downpour. In cold weather, frost can damage wet brick and render, so the problem grows beyond the joint itself. 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.
Every job is a little different, so we quote each one individually. Size, access and the product the joint needs all play a part, and we’ll explain the quote if you ask.
Why book with us
- Homes, businesses and hotels
- Old sealant always removed completely
- ARBOMaster approved applicator
- Trusted Arbo and Everbuild sealants
Read our cost guide and what customers say.
What the job involves on each surface
Render joints
Cracks along render joints let water in behind the coat. Resealing the joints early keeps water out and protects the render itself.
Joints between dissimilar materials
Different materials may need different primers. Both surfaces are cleaned and primed as the product requires.
Landlord and commercial work in Portnahaven
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
Landlords and letting agents in Portnahaven can book us as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order.
Portnahaven: your questions answered
Do you cover smaller places like Portnahaven?
Yes, we do. Our work covers the whole of Scotland, and smaller places are part of that. Longer journeys are simply planned in advance.
Do you cover Portnahaven for external mastic?
Yes, Portnahaven is within the area we cover. Our work covers the whole of Scotland. You can send an email to info@mrmastic.co.uk and tell us what needs doing.
Do you take out the old sealant first?
Yes, always, and completely. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
Does someone need to be in?
Access is agreed with you when the job is booked. Indoors, that normally means someone at home.
Do you use backing rod?
That’s backing rod, a closed-cell foam. It keeps the sealant at the right depth and bonded to the sides only, which would stop it stretching.
Are you fully insured?
Yes. We’re fully insured, and we can confirm the details when we quote.
How long should I leave it?
That depends on the sealant used, so please follow the time we give you when we finish.
Can you match the colour of my brickwork?
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.
How it works
There’s no need to move everything out, only the area right around the joints. We protect the rest, and the work takes anything from a few hours to several days, depending on the building for a typical job. For a place like Portnahaven, longer drives are planned in advance. Mention tracks, gates, ferries or anything else about the route.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- The old mastic and anything lodged in the joint is removed.
- The joint faces are cleaned and primed where the sealant needs it.
- 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
- For indoor joints, keep the area dry beforehand if you can
- Mention any parking rules near the property
- On commercial sites, let us know about site rules
Ask for a quote
There’s no standard price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To get started, drop us a line at info@mrmastic.co.uk.
Advice
Quotes for external mastic in Portnahaven
We quote each job individually. This is what makes a difference:
- The number of rooms or windows
- Working hours on commercial sites
- The old material and how stubborn it is
- The product the joint needs
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please email us at info@mrmastic.co.uk.
Asking for a quote
When you call or email, it’s useful to know:
- Where the job is, and your postcode
- Whether it’s a home or a business
- The rough size of the job
- What the problem is, such as mould, gaps, leaks or cracking
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. Whenever you are ready, drop us a line at info@mrmastic.co.uk.
Should I try it myself first?
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.