Highland · Scotland
External & façade joints in Janetstown, Highland
External mastic for Janetstown, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Damp patches traced to an open external joint
- Cracked joints where brick meets render or frames
- Sealant pulling away from one side of the joint
How we handle external mastic in Janetstown
External mastic is a job where short cuts show quickly. New sealant over old, joints packed with mortar and beads with no backing all tend to fail early. We strip the joint back and start again. If you have joints with sealant missing in places and joints where the bead has come unstuck, we can put it right, on joints between brick and frames, façade panels and concrete & block alike.
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.
Our work is backed for twelve months, in Janetstown and everywhere else we cover.
- Place
- Janetstown (KW14)
- Region
- Highland
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- info@mrmastic.co.uk
- Updated
- 26 October 2026
How to look after the new joints
Simple care keeps the joints in good condition. Our advice:
- Keep water from gutters off the wall
- Show decorators and builders where the movement joints are
- Have failed joints looked at early
- Avoid pressure-washing directly into sealant joints
Only paint over the joint if we have confirmed the sealant can take paint. Paint can crack on a flexible joint, and paint can crack as the joint moves.
Once a joint can’t move, the wall finds another way, usually as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
Janetstown questions
Does the coastal weather in Janetstown 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 help a landlord with a rental near Thurso station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can email us at info@mrmastic.co.uk with the details for a clear quote.
Is it worth trying it myself?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
Do you seal joints where cladding meets other materials?
Yes. We cut out the old sealant, prepare both faces and reseal with a flexible exterior product. The colour is chosen to suit.
Is there any odour?
Some sealants have a smell while they cure. Ventilation helps.
Does someone need to be in?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
What does external mastic cost?
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.
Do you work for hotels and businesses?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. Working times can be discussed when we quote.
How it works
Once we’re on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. Most jobs then take anything from a few hours to several days, depending on the building. Outside jobs in Janetstown need a dry day, because sealant won’t bond to a wet joint, so external jobs may need to move if the day turns wet. Indoor work goes ahead whatever the weather.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Preparing for the visit
- Let us know about parking restrictions
- Mention any tricky access
- Keep pets and children clear of the area while we work
Getting a quote
Asking for a quote is easy: let us know the job and the location. A few pictures by email make the job easier to understand.
Read more
Signs you need external mastic in Janetstown
A lot of failed joints come down to preparation: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The sealant never bonds properly.
Signs it’s time to call us include:
- Damp patches traced to an open external joint
- Moss and dirt in joints with no sealant left
- Joints with sealant missing in places
- Weathered mastic that no longer stretches
For site and facilities teams at buildings such as Thurso High School, larger buildings have long runs of movement joint that eventually need resealing.
What your quote should include
- The length of the guarantee
- Is VAT in the price?
- Whether the sealant suits the joint
- What happens if the job turns out different
Can I do it myself?
If you do try it yourself, take your time over the 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.
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly.
What the job involves on each surface
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. The old joint is removed and a sealant that bonds to both sides goes in.
Concrete and blockwork
Wide joints in concrete need the depth controlling carefully. We size the backing rod to the gap so the sealant isn’t too deep.
What sealant work can’t fix
We will not take on work that won’t last, so here’s what sealant can’t put right:
- Cracked brickwork or render that needs a builder or plasterer
- Walls that need new movement joints cut into them
- Damp that is not coming from the joint
If in doubt, email us at info@mrmastic.co.uk and we’ll say what we think before booking.
What we seal
- Façade panels
- Joints between brick and frames
- Concrete & block
- Copings & trims
- Render & cladding joints
- Brickwork movement joints
Also in Janetstown
Janetstown buildings and the weather
Janetstown 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. Private landlords in Scotland must meet the Repairing Standard, which includes keeping a home wind and watertight, and sound outside sealant is part of that.
Rented homes near Thurso station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets.
Janetstown is about 3 miles south-west of Thurso, in Highland. Whether you’re in the middle of Janetstown or further out, we cover external mastic for every kind of property, from flats and houses to offices and hotels. Our area takes in 253 places across Highland.
Our applicators cover all of KW14 for external mastic. Neighbouring places we cover for external mastic include Glengolly (1 mile east), Westfield (2 miles south-west), Thurso (3 miles north-east), Scrabster (3 miles north) and Forss (3 miles north-west). Remote and island addresses need a little more planning, so tell us where you are when you ask for a quote.
Around Janetstown
Janetstown’s nearest station is Thurso station, roughly 2.4 miles north-east. A little further out are Dunbar Hospital (1.8 miles north-east) and Thurso Heritage Museum (2.7 miles north-east). Green spaces nearby include Broubster Leans RSPB Reserve and Loch Calder.
Work for landlords, hotels and businesses
Landlords and agents in Janetstown can book us as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
For anyone letting property in or around Janetstown, several properties can be quoted together. Just tell us the addresses and what each one needs.