Shetland Islands · Scotland
External & façade joints in Firth, Shetland Islands
Our applicators work in Firth on sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Plants rooting in failed movement joints
- Leaking joints around cladding and façade panels
- Brick movement joints where the sealant has split
External mastic in Firth, done properly
Failed sealant is cut out, the depth set with closed-cell backing rod, and the joint resealed with a low-modulus sealant made for outside. We pick a colour that sits well with the wall so the line blends in. If you are dealing with joints with sealant missing in places and panel joints letting water in, we can put it right.
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.
There’s a 12-month guarantee on every job, large or small.
- Where
- Firth (ZE2)
- Region
- Shetland Islands
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
What happens on the day
We keep the work tidy and contained to the area we’re working on, so you can get on with your day. The job usually takes a few hours to a few days, depending on the length of joint and the access, and we explain the cure time before we leave. In smaller Scottish places, parking is usually less of an issue than access and distance. Let us know how to find you and how to reach the joints, and the visit is planned around that.
- First, the joints are inspected and the access agreed.
- 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.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- Move anything stored near the joints
- Tell us about any previous sealing or DIY attempts
- For business premises, tell us about site rules or sign-in
Getting a quote
For external mastic in Firth, send an email to info@mrmastic.co.uk. Tell us what the problem is and where, and you’ll get a clear quote before any work starts.
Read more
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Keep high-pressure jets off the joints
- Leave the joints unpainted unless we have said otherwise
- Keep water from gutters off the wall
- Do not let climbing plants root in the sealant
Follow the cure time we give you before the joint is knocked or disturbed. Most exterior sealants skin fast but take longer to cure right through.
Once a joint can’t move, the wall finds another way, often as cracks near the joint. Catch it early and you reduce the risk.
Why it’s worth doing now in Firth
Running new sealant over the old bead rarely lasts. New sealant doesn’t bond well to old, weathered sealant, so the old joint is cut out fully first. In an older home around Firth, damp from a failed joint can get into timber and plaster.
Doing several joints on one visit is usually more efficient than separate visits, so tell us about everything that needs sealing. We’ll send you a clear quote for the lot.
Why Firth customers choose us
- Anti-fungal silicone where joints get wet
- Tidy, careful work
- Old sealant always removed completely
- Trusted Arbo and Everbuild sealants
Read how sealant jobs are priced and our reviews.
External mastic in Firth: local notes
Firth 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. Plenty of Scottish homes have harled walls, and joints where harling meets other materials need a sealant that can grip and flex.
Around Firth, as everywhere, external mastic is only as good as the preparation behind it. Whether the job is in Firth itself or nearby, the right material for each joint matters as much as a neat finish.
Firth is in the Shetland Islands. Firth gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Our area takes in 63 places across the Shetland Islands.
Jobs for external mastic in ZE2 is quoted and booked the same way as anywhere else. You’ll find streets such as Midlea, Leaside and Sandside, all of which we cover. Neighbouring places we cover for external mastic include Mossbank (1 mile north-east), Scatsta (4 miles west), Vidlin (6 miles south), Sullom (6 miles west) and Burravoe (6 miles north-east). If you are somewhere remote, the job takes a little more planning, so let us know when you get in touch.
Around Firth
The countryside around Firth includes Loch of Bordigarth.
Different surfaces, different methods
Concrete and blockwork
Big joints in concrete need careful depth control. Backing rod sized to the joint sets it so the sealant is not too deep.
Cladding and façade panels
Metal and composite panels move a lot with temperature, so the joints work hard every day. We choose the product to suit.
For landlords and businesses
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
In hotels, rooms out of use cost money, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
What affects the cost of external mastic
Every job gets its own quote. This is what makes a difference:
- Whether there’s mould to deal with
- The size of the job
- The number of rooms or windows
- Working hours on commercial sites
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.
What we need to know
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- What the problem is, such as mould, gaps, leaks or cracking
- Access, such as stairs, a lift or height
- A few photos by email, if you can
- Roughly how big the job is
Every job is quoted individually, so start by telling us what you need. Just send an email to info@mrmastic.co.uk with the details.
What else we do in Firth
Your questions about external mastic in Firth
Is external mastic in a coastal place like Firth any different?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. The right product, a clean joint and the right depth all help it cope.
Do you cover smaller places like Firth?
Yes, smaller places are covered as well as towns. Our work covers the whole of Scotland, including the islands, where work is planned around ferry crossings. Let us know about access, parking and anything unusual about getting there when you book.
Can you match the colour of my brickwork?
The sealant colour is picked to suit the wall so the joint blends in. There’s a wide choice of exterior colours.
How long does external mastic take?
It depends on the size of the job, but as a guide it takes a few hours for a handful of joints, longer for a whole elevation. We’ll give you a better idea when we quote.
Are you ARBOMaster approved?
Yes. We’re approved under the ARBOMaster scheme.
Can new sealant go over the old?
No. New silicone will not bond to old silicone, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Will you leave a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
Do you seal joints where cladding meets other materials?
Yes. Different materials move at different rates, so a flexible sealant is needed where they meet. We choose one that suits both surfaces.
DIY sealant or a professional job?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.