Highland · Scotland
Invermoriston External Mastic
Our applicators work in Invermoriston on sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly.
- Failed sealant between panels on a façade
- Hard, crazed mastic that has stopped moving
- Weeds or debris growing in open joints
Outside joints around Invermoriston
Plenty of Scottish homes have harled walls, and where harling meets frames, pipes and other materials, the joint needs a flexible sealant that grips a rough surface. Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and failed outside joints work against that.
In and around Invermoriston, as anywhere, good external mastic starts with a clean, dry, properly prepared joint.
Invermoriston is about 23 miles south-west of Inverness, in Highland. From the centre of Invermoriston to the outskirts, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Invermoriston is one of 253 places in Highland where we work.
All of IV63 is covered for external mastic, from the main roads to the quietest streets. Streets in the area include Riverside Park and Glendale Park. Nearby, we also carry out external mastic in Stratherrick (4 miles south-east), Fort Augustus (5 miles south-west), Gorthleck (7 miles east), Glen Moriston (7 miles south-west) and Newtown (9 miles south-west). If you’re somewhere remote, the job takes a little more planning.
Local landmarks in Invermoriston
Not far away are Loch a' Mheig and Càrn an t-Seana-bhlàir.
External mastic for homes and businesses in Invermoriston
For buildings in Invermoriston, we reseal external joints of all kinds, from brick movement joints to cladding panels. Every joint gets the same careful preparation: clean, sound faces and a controlled depth. Common call-outs are for hard, crazed mastic that has stopped moving and joints where the bead has come unstuck, on façade panels, joints between brick and frames and concrete & block.
Older stone buildings need a sealant that suits the stone, not an acetoxy product that can mark or attack it. Newer houses need their movement joints and roofline trims kept sound.
Each job carries a 12-month guarantee.
- Where
- Invermoriston (IV63)
- Wider area
- Highland
- Cover
- One year on every job
- Price
- A clear price before any work starts
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
DIY sealant or a professional job?
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Common questions in Invermoriston
Is Invermoriston in your area for external mastic?
Yes, Invermoriston is within the area we cover. Our work covers the whole of Scotland. You can email us at info@mrmastic.co.uk and let us know what needs doing.
Is there a guarantee on external mastic in Invermoriston?
All our work, in Invermoriston and everywhere else, comes with a 12-month guarantee. We are also fully insured and ARBOMaster approved.
Do you remove the old sealant?
Yes, every time. New silicone doesn’t stick to old silicone, so any old material comes out before anything new goes in.
Will the new joint stand out?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We pick the one that suits your wall best.
What is a movement joint?
Brickwork, render and cladding all move a little, and planned joints take up that movement. It’s closed with backing rod and a flexible sealant.
Is there any odour?
Some sealants have a smell while they cure, which fades as it sets. Ventilation helps.
How long should I leave it?
Cure times vary by product. Before we leave, we’ll tell you the cure time.
Why do you put foam in the joint first?
The foam is closed-cell backing rod. It stops the sealant going in too deep and bonding to three sides.
What happens on the day
Every visit runs the same way: we check the joints, protect the area around them, carry out the job and clear up. Most jobs take a few hours to a few days, depending on the length of joint and the access. Outside jobs in Invermoriston need a dry day, because sealant will not bond to a wet joint, so an outdoor job can move if the forecast changes. Work indoors isn’t affected.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- Move anything stored near the joints
- Let us know about stairs, lifts or work at height
- Tell us about any previous sealing or DIY attempts
Ask for a quote
There’s no standard price list. Instead, we give you a clear price for your job. To arrange one, email us at info@mrmastic.co.uk.
Related advice
Leave it or put it right?
Done well, a resealed joint is a neat, straight line that suits the wall. A rushed bead with no backing looks untidy and does not last. In a place like Invermoriston, small leaks are easy to put off, 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. If you are unsure, drop us a line at info@mrmastic.co.uk for an honest opinion and a quote.
Why Invermoriston clients choose us
- A 12-month guarantee on all work
- Homes, businesses and hotels
- Over 20 years’ experience
- Approved under the ARBOMaster scheme
Take a look at what affects the cost and what customers say.
What sealant work can’t fix
We’d rather tell you now than do work that won’t last, so these are the limits:
- Loose or hollow render, which needs re-rendering
- Walls that need new movement joints cut into them
- Movement that’s more than a sealant joint can take
If you are not sure, just email us at info@mrmastic.co.uk and we will give you a straight answer.
Surfaces we seal
- Façade panels
- Brickwork movement joints
- Copings & trims
- Concrete & block
- Render & cladding joints
- Joints between brick and frames
Also near Invermoriston
What else we do in Invermoriston
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Point out the joints to other trades
- Ask before painting over external sealant
- Check external joints each spring
- Get split or bare joints resealed while the damage is small
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They should be kept open and resealed, not filled.
If you can see gaps, plants or bare sections in a joint, have it checked. Earlier resealing means a smaller job and a better result.
What the job involves on each surface
Copings and trims
A failed coping joint lets water into the top of the wall. Sealing them early saves the wall below.
Cladding and façade panels
If the façade has a specified sealant, that’s what we use or an approved alternative. Send us any details you have about the façade.
Common problems we fix in Invermoriston
Joints sealed without backing rod, or far too deep, rarely last. If the sealant sticks to the back as well as the sides, it can’t stretch and rips as the joint opens.
The problems people normally mention when they call are:
- Water getting into walls through failed joints
- Hard, crazed mastic that has stopped moving
- Movement joints with cracked, split or missing sealant
- Leaking joints around cladding and façade panels
For an older house near a landmark such as Church of Scotland, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Questions to ask before you book
- Are they insured?
- Which sealant they’ll use, and why
- How long the guarantee is
- Which colour the sealant will be