Highland · Scotland
Navidale External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for homeowners, landlords and businesses in Navidale. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Joints where the bead has come unstuck
- Brick movement joints where the sealant has split
- Rain getting behind render or cladding at a joint
Why deal with it now?
Running new sealant over the old bead rarely lasts. The new layer cannot bond properly to old, weathered material, so the old joint is cut out fully first. Around Navidale, water from a failed joint in an older stone home can soak into timber and plaster.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
Why Navidale clients choose us
- More than 20 years in sealant work
- Any old sealant cut out fully, not covered over
- A choice of colours where the product allows
- We’re fully insured
See our cost guide and our reviews.
About our external mastic in Navidale
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. We work on render & cladding joints, copings & trims and brickwork movement joints, and people most often call us about gaps where render, brick and frames meet and rain getting behind render or cladding at a joint.
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.
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.
- Where
- Navidale (KW8)
- Wider area
- Highland
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Navidale: your questions answered
Do you work for landlords with property near Helmsdale station?
Yes, rental work is part of what we do. You can drop us a line at info@mrmastic.co.uk with the address and a few details, and we’ll give you a fixed price before we start.
Is external mastic in a coastal place like Navidale any different?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Do you work at height?
That depends on how high the joints are and the ground below. Ground-floor joints are simple; for higher ones, send details and we will confirm the access.
Can you seal over the old sealant?
No. Fresh sealant does not stick to old sealant, and it traps any mould or water underneath. We remove it all first.
What should I tell you?
Where the job is, what the problem is and roughly how big it is. If you can, email a few photos.
Do you work in Navidale?
Yes, we do. Our applicators work in Navidale, and the service is the same as everywhere else.
Which products do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
Common problems we fix in Navidale
Sunlight, wet weather and frost wear exterior sealant down. In time it goes hard, crazes on the surface and stops stretching, so the next time the wall moves, it splits or pulls away.
If you can see any of these, it’s time to have the joints looked at:
- Plants rooting in failed movement joints
- Gaps where render, brick and frames meet
- Water getting into walls through failed joints
- Sealant pulling away from one side of the joint
Around Navidale, as everywhere, external mastic is only as good as the preparation behind it.
What to look for in a quote
- What happens if they find a problem under the old sealant
- How the surfaces are prepared before sealing
- Whether they’re fully insured
- Who turns up on the day
Navidale buildings and the weather
Navidale is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on movement joints and outside wall joints, especially on the side facing the sea. Harled (roughcast) walls are common in Scotland, and joints where harling meets other materials need a sealant that can grip and flex.
For landlords with property near Helmsdale station, outside joints that have cracked can let damp into a rental, so check them between lets.
Navidale is about 33 miles south of Thurso, in Highland. Our applicators cover external mastic for homes and businesses in Navidale and nearby. Navidale is one of 253 places in Highland where we work.
Every address in KW8 is covered for external mastic. Close by, we work in East Helmsdale (1 mile south-west), Berriedale (6 miles north-east), Dalchalm (10 miles south-west), Clynelish (11 miles south-west) and Balnabruich (11 miles north-east). Remote and island addresses need a little more planning, so please mention your location when you drop us a line at info@mrmastic.co.uk.
Around Navidale
The nearest railway station is Helmsdale station, roughly 1 mile south-west of the centre. Nearby you’ll also find Timespan (0.8 miles south-west). Green spaces nearby include Ord of Caithness.
Can I do it myself?
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
A DIY attempt doesn’t rule out a professional job. We cut it out and start again.
What happens on the day
When we arrive, we start by going over the job with you, so you know exactly what we are doing. We protect the surfaces around the joints before any work begins. The work normally takes a few hours to a few days, depending on the length of joint and the access. Outside jobs in Navidale need a dry day, because sealant will not bond to a wet joint, so external jobs may need to move if the day turns wet. Indoor work goes ahead whatever the weather.
- We start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs 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
- Mention any sign-in or site rules at work premises
- Move anything stored near the joints
- Keep children and pets away from the work area
Get a quote
Need a quote? Please send an email to info@mrmastic.co.uk with a few details. We will explain what we’d do and send you a clear quote before any work starts.
Related advice
What affects the cost of external mastic
Some jobs are bigger than they look, and some smaller. The main factors:
- How easy the joints are to reach
- Which sealant suits the joint
- Whether old sealant or filler has to be cut out
- How many rooms, windows or areas are involved
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Asking for a quote
When you contact us, it’s useful to know:
- The address or postcode of the job
- Any previous sealing or DIY work
- Any access issues, like height or stairs
- How many joints, rooms or windows are involved
For external mastic in Navidale, drop us a line at info@mrmastic.co.uk. Tell us what the problem is and where, and you’ll get a clear quote before any work starts.
How to look after the new joints
After the cure time, these simple habits help:
- Keep high-pressure jets off the joints
- Look over the joints every year, ideally after winter
- Ask before painting over external sealant
- Don’t let climbing plants root in the sealant
Have a quick look at the joints each spring. Watch for splits, edges coming away or growth in the joint.
Leaks behind façade panels and render often go unseen. When it finally shows inside, the joint may have been open for years.
Places near Navidale
Also in Navidale
What sealant work cannot fix
New sealant can’t fix everything, and we’d rather say so up front. Sealant will not put right:
- Adding movement joints to masonry that has none
- Damp that isn’t coming from the joint
- Subsidence or other structural problems
Not sure which it is? You can drop us a line at info@mrmastic.co.uk and we’ll tell you honestly before booking.
Joints and surfaces we work on
- Render & cladding joints
- Façade panels
- Joints between brick and frames
- Brickwork movement joints
- Concrete & block
- Copings & trims