Highland · Scotland
External Mastic in Fort Augustus
External mastic for Fort Augustus, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Gaps where render, brick and frames meet
- Panel joints letting water in
- Weathered mastic that no longer stretches
Should I try it myself first?
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
About our external mastic in Fort Augustus
Short cuts in external joints show up within a season or two. Overfilled joints, missing backing rod and sealant laid over old sealant all tend to fail early. We take the old material out and do it properly. We work on brickwork movement joints, copings & trims and render & cladding joints, and the jobs we see most are rigid filler in a joint that should flex and brick movement joints where the sealant has split.
In and around a place like Fort Augustus, many buildings face open ground and take the full weather. Outside joints on exposed walls work hard.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Place
- Fort Augustus (PH32)
- Wider area
- Highland
- Guarantee
- One year on every job
- Quote
- A clear price before work begins
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
The process
Once we’re on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. After that, the work takes a few hours for a handful of joints, longer for a whole elevation. Around Fort Augustus, distance and access matter more than parking. 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.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Before we arrive
- Mention any parking rules near the property
- Let us know if you’ve seen damp or leaks
- For business premises, tell us about site rules or sign-in
Getting a quote
For a quick quote, get us on the phone, or email us if that is easier. Tell us about the joints that need doing and we will explain what’s involved and give you a clear price.
Read more
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Show decorators and builders where the movement joints are
- Check external joints each spring
- Fix overflowing gutters above sealed joints
- Keep movement joints as flexible joints, not mortar
Look over the joints once a year, ideally after winter. Splits, gaps at the edges or plants in the joint are early warning signs.
Small splits are the time to act. Then it’s a straightforward cut-out and reseal with no damage behind it to deal with.
What we can’t put right
We will always be straight with you, so here’s what sealant cannot fix:
- Structural movement, which needs a surveyor or engineer
- Failed render or damaged cladding panels
- Damp that isn’t coming from the joint
Not sure which it is? You can drop us a line at info@mrmastic.co.uk and we’ll tell you honestly before booking.
Where we work in Fort Augustus
- Copings & trims
- Joints between brick and frames
- Brickwork movement joints
- Façade panels
- Concrete & block
- Render & cladding joints
Fort Augustus buildings and the weather
Plenty of Scottish homes have harled walls, and joints where harling meets other materials need a sealant that can grip and flex. The west of Scotland is wetter than the east, so there’s plenty of rain for movement joints and outside wall joints to keep out.
For site and facilities teams at buildings such as Kilchuimen Academy, its movement joints, gutters and trims need looking after like any other building’s. Around Fort Augustus, as everywhere, external mastic is only as good as the preparation behind it.
Fort Augustus is about 28 miles south-west of Inverness, in Highland. Anywhere in PH32, we can carry out external mastic at your property. Fort Augustus is one of 253 towns and villages in Highland we cover. For nearby work, see our Dundee page.
Every address in PH32 is covered for external mastic. You’ll find streets such as Station Road, Free Church Road and Canal Side, and we cover them all. Close by, we work in Newtown (3 miles south-west), Aberchalder (4 miles south-west), Glen Moriston (5 miles north-west), Invermoriston (5 miles north-east) and Stratherrick (7 miles north-east). For island and remote addresses, the job takes a little more planning, so let us know when you get in touch.
Around Fort Augustus
Locally, jobs take us to homes and businesses close to The Lovat Hotel. Green spaces nearby include Murligan Hill and Loch Uanagan.
How the job changes by surface
Concrete and blockwork
Big joints in concrete need careful depth control. We size the backing rod to the gap.
Brickwork movement joints
Brick walls have vertical movement joints to absorb expansion. We reseal them with a low-modulus sealant over backing rod.
Nearby places to Fort Augustus
What else we do in Fort Augustus
Why deal with it now?
An open joint keeps letting water into the wall with every downpour. Wet masonry is more easily damaged by frost, so the problem grows beyond the joint itself. When the nearest tradesperson is a drive away, it’s tempting to leave a small leak, but water behind a failed seal does the most damage when nobody’s watching.
Leaving a failed joint usually makes the job bigger, not smaller, as water and mould keep getting in. If you are unsure, email us at info@mrmastic.co.uk and we’ll give you an honest view and a quote.
Why book with us
- Colour agreed with you before any work starts
- 12-month guarantee on every job
- Old sealant always removed completely
- Sanitary silicone with an anti-fungal additive in wet areas
See what affects the cost and our reviews.
FAQs for Fort Augustus
Is external mastic in Fort Augustus guaranteed?
All our work, in Fort Augustus and everywhere else, comes with a 12-month guarantee. We are also fully insured and ARBOMaster approved.
Is Fort Augustus within the area you cover?
Yes, Fort Augustus is covered. We work across all of Scotland, from towns to the smallest places. Longer journeys are simply planned in advance.
How do I get a quote for external mastic in Fort Augustus?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote and we will talk you through it.
How do you reach high-level joints?
It depends on the building. Send us pictures and a rough idea of the height and we’ll confirm how they can be reached safely.
Is there any odour?
Possibly a little. It fades as the sealant cures.
Is it worth trying it myself?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
What is a movement joint?
A movement joint is a planned break in the wall that absorbs expansion and shrinkage. It should be filled with flexible sealant, never mortar.
Can you quote for more than one area?
Of course. Combining jobs makes good use of the visit.
Quotes for external mastic in Fort Augustus
Some jobs are bigger than they look, and some smaller. What affects the quote:
- When we can work, for business premises
- The number of rooms or windows
- Whether there’s mould to deal with
- How much old sealant there is and how hard it is to remove
The cost reflects the work involved, not guesswork. That is why we ask about the job first and agree the price before starting.
Asking for a quote
To help us quote quickly, please include:
- Whether it’s a home or a business
- Where the property is
- Access, such as stairs, a lift or height
- Photos by email, if that is easy
We don’t publish a price list, because every job is different. Instead, we send you a clear quote for your job. To arrange one, drop us a line at info@mrmastic.co.uk.