Shetland Islands · Scotland
Gremista External Mastic
Our applicators work in Gremista on sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly.
- Rigid filler in a joint that should flex
- Hard, crazed mastic that has stopped moving
- Failed sealant between panels on a façade
About our external mastic in Gremista
A movement joint is a deliberate break that lets a wall expand and contract. The sealant in it has to stretch and squeeze for years, so once it splits or hardens, the joint stops working and water gets in. If you have plants rooting in failed movement joints and movement joints with cracked, split or missing sealant, we can help.
In and around a place like Gremista, many buildings face open ground and take the full weather. Outside joints on exposed walls work hard.
We stand behind the work with a one-year guarantee, so you’re not left on your own once the job is done.
- Location
- Gremista (ZE1)
- Region
- Shetland Islands
- Cover
- 12 months on all our work
- Quotes
- A clear price before we start
- info@mrmastic.co.uk
- Updated
- 26 October 2026
Gremista questions
Is external mastic in a coastal place like Gremista any different?
Coastal homes put outside sealant through more weather than inland ones, so preparation and the right sealant matter all the more. Walls facing the sea are usually the first to need attention.
Do you cover smaller places like Gremista?
Yes, Gremista is covered. We work across all of Scotland, islands included, and smaller places are part of that. Longer journeys are simply planned in advance.
Are you insured?
Yes. We are fully insured for every job we do.
How long does the job take?
That depends on how much there is to do, but as a guide it takes a few hours for a handful of joints, longer for a whole elevation. We’ll tell you when we quote.
How much does external mastic cost in Gremista?
Every job is different, so each one gets its own quote. For a quick quote, drop us a line at info@mrmastic.co.uk and let us know what needs doing and where.
Is it messy?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
Can landlords and businesses book you?
Yes, we do. Domestic, commercial and hotel work are all part of what we do, and we are fully insured.
Is there a guarantee?
Yes: twelve months. If anything isn’t right with the work within the year, let us know and we’ll sort it.
Also in Gremista
Common problems we fix in Gremista
UV, rain and frost all age exterior sealant. In time it goes hard, crazes on the surface and stops stretching, so the next time the wall moves, it splits or pulls away.
Look out for these signs:
- Old sealant gone brittle and cracked
- Damp patches traced to an open external joint
- Moss and dirt in joints with no sealant left
- Panel joints letting water in
Managing a site like Anderson High School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Comparing quotes
- What happens if they find a problem under the old sealant
- How the joint is cleaned and prepared
- How long the guarantee is
- How the colour is chosen
What we cannot put right
Before booking, it’s worth knowing the limits:
- Rising or penetrating damp from elsewhere in the wall
- Render that’s blown, hollow or coming away
- Adding movement joints to masonry that has none
Not sure which it is? You can drop us a line at info@mrmastic.co.uk and we will tell you honestly before booking.
Joints and surfaces we work on
- Brickwork movement joints
- Copings & trims
- Joints between brick and frames
- Façade panels
- Concrete & block
- Render & cladding joints
Quotes for external mastic in Gremista
We quote each job individually. These are the things that affect it:
- How many areas need sealing
- Any working-time requirements on site
- How much old sealant there is and how hard it is to remove
- Any mould that needs treating
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, plus any working-time requirements on site. Ask us for a quote and we’ll go through it with you.
Asking for a quote
Before you ask for a quote, have a think about:
- The rough size of the job
- The address or postcode of the job
- Any access issues, like height or stairs
- The problem you’ve noticed
If you are in Gremista and need external mastic, drop us a line at info@mrmastic.co.uk. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
Work for landlords, hotels and businesses
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we’ll quote.
In hotels, rooms out of use cost money, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
Surface by surface
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.
Render joints
Render has movement joints and stop beads that need sealing. They’re resealed in a sealant that suits the render.
Outside joints around Gremista
Gremista is within about 1 mile of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That is hard on movement joints and outside wall joints, especially on the side facing the sea. Work on the islands has to be planned around ferry crossings and the weather, so the more notice, the better.
If you live in an older home near St Margaret's Roman Catholic Church, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Gremista is about 1 mile north of Lerwick, in the Shetland Islands. For external mastic in and around Gremista, please send an email to info@mrmastic.co.uk for a quick quote. We cover the Shetland Islands from our Crawley base. Our area takes in 63 places across the Shetland Islands, large and small.
Here we cover the ZE1 postcode area for external mastic. Streets in the area include Gremista Road, Arlanda Yard and Holmsgarth Brae, and we cover them all. We also cover Heogan (1 mile east), Lerwick (1 mile south), Sound (2 miles south), Gunnista (2 miles east) and Veensgarth (2 miles west). Island and remote addresses take a little more planning, so please mention your location when you send an email to info@mrmastic.co.uk.
Local landmarks in Gremista
In Gremista, that means homes and buildings near Gilbertson Park. Nearby you’ll also find Montfield Hospital (1.2 miles south) and Shetland Textile Museum (under half a mile south). For a walk, there’s Loch of Kebister and Setter Hill.
What happens if it’s left?
It often makes sense to reseal all the failing joints on an elevation together. They’ve weathered the same way, and access only has to be arranged once. Exposed walls in smaller Scottish places take a lot of wind and rain, and damp in stone or harled walls takes a long time to dry once water gets behind a joint.
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all make a difference, and we will explain the quote if you ask.
What you get with us
- White, clear, grey or coloured to suit, where the product allows
- We’re fully insured
- Colour agreed with you before any work starts
- A 12-month guarantee on all work
Take a look at what affects the cost and our reviews.
The process
We keep the work tidy and contained to the joints we’re treating, so you can carry on as normal. The job usually takes anything from a few hours to several days, depending on the building, and we tell you how long to leave it before we go. Around Gremista, distance and access matter more than parking. Let us know how to find you and how to reach the joints.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- Mention any leaks or damp you’ve noticed
- Mention any parking rules near the property
Get a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we’ll talk you through the work before giving you a price.