Shetland Islands · Scotland
Mossbank External Mastic
External mastic for Mossbank, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Failed sealant between panels on a façade
- Failed seals between different materials
- Water getting into walls through failed joints
How it works
Every visit runs the same way: we look at the joints together, protect the area around them, carry out the job and clear up. Most jobs take anything from a few hours to several days, depending on the building. For a place like Mossbank, longer drives are planned in advance. Mention tracks, gates, ferries or anything else about the route.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- 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.
How to prepare
- Try not to wet indoor joints just before the visit
- Tell us about any previous sealing or DIY attempts
- For business premises, tell us about site rules or sign-in
Get a quote
Call for a quick quote, or email us if that is easier. Describe what needs sealing and we will explain what’s involved.
Read more
External mastic in Mossbank, done properly
For buildings in Mossbank, we reseal external joints of all kinds, from brick movement joints to cladding panels. The preparation is the same whatever the wall: clean joint faces and the right depth. If you’re dealing with weeds or debris growing in open joints and brick movement joints where the sealant has split, we can help, on façade panels, concrete & block and brickwork movement joints alike.
Older stone buildings need a sealant that suits the stone, not an acetoxy product that can mark or attack it. On newer homes, the movement joints and roofline trims are what need watching.
You get a 12-month guarantee, the same in Mossbank as everywhere else we work.
- Location
- Mossbank (ZE2)
- Region
- Shetland Islands
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before work begins
- info@mrmastic.co.uk
- Updated
- 26 October 2026
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Make sure movement joints are not pointed over
- Check the sealant is paintable before painting near it
- Keep soil, plants and ivy away from the joints
- Get split or bare joints resealed while the damage is small
Avoid pressure-washing straight into the joints. High-pressure water can lift the edges.
Leave a failed movement joint and water keeps getting into the wall. Over time it can mean damp inside, stained render or frost-damaged brick.
Also in Mossbank
Mossbank questions
Will you come out to Mossbank?
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.
Is Mossbank in your area for external mastic?
Yes. We work across all of Scotland, and Mossbank is part of that. You can email us at info@mrmastic.co.uk and let us know what needs doing, and we will give you a clear quote.
Should I try DIY first?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
How often do external joints need resealing?
It varies from wall to wall: sunny, exposed elevations and busy joints wear faster. Check them each year and reseal when they split or harden. Every job carries our one-year guarantee.
Are you ARBOMaster approved?
Yes. We hold ARBOMaster approved applicator status and we’re fully insured too.
Do you remove the old sealant?
Yes, every time. New sealant won’t bond properly to old, so the joint is cleaned back first.
Do you guarantee your work?
Yes: twelve months. If there’s a problem with our work in that time, tell us and we will put it right.
Do you work for letting agents?
Yes. We work for householders, landlords, letting agents, businesses and hotels in Mossbank.
Work for landlords, hotels and businesses
Letting agents and landlords in Mossbank 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.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. Several properties can go on one quote.
Signs you need external mastic in Mossbank
The wrong product in a moving joint is a classic cause. A high-modulus or general-purpose sealant can be too rigid for a busy joint, and it tears off the sides.
People generally contact us when they notice something like this:
- Joints pointed up with cement by mistake
- Brick movement joints where the sealant has split
- Damp patches traced to an open external joint
- Moss and dirt in joints with no sealant left
Around Mossbank, as everywhere, external mastic is only as good as the preparation behind it.
What to look for in a quote
- What preparation is included
- Whether they’re fully insured
- What happens if they find a problem under the old sealant
- What the quote includes, VAT included or not
Walls and rooflines in Mossbank
Mossbank is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That is 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.
For jobs in and around Mossbank, choosing the right material for each joint is as important as a tidy finish.
Mossbank is in the Shetland Islands. For external mastic in and around Mossbank, please drop us a line at info@mrmastic.co.uk for a quick quote. We cover the Shetland Islands from our Crawley base, Mossbank included. Mossbank is one of 63 towns and villages in the Shetland Islands we cover for external mastic.
Our applicators cover all of ZE2 for external mastic and the streets around it. External mastic is available to properties on Smuggabank, Rayburn Road and Burraness and the roads around them. We also cover Firth (1 mile south-west), Scatsta (4 miles south-west), Burravoe (5 miles north-east), Ollaberry (6 miles north-west) and Vidlin (6 miles south). Remote and island addresses need a little more planning, so tell us where you are when you ask for a quote.
What’s near Mossbank
Green spaces nearby include Neshion Water.
What sealant work can’t fix
It helps to know what we can’t do:
- Loose or hollow render, which needs re-rendering
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Cracks in the bricks or render themselves, away from the joints
If you are not sure, just email us at info@mrmastic.co.uk and we will give you a straight answer.
What we seal
- Copings & trims
- Brickwork movement joints
- Joints between brick and frames
- Façade panels
- Concrete & block
- Render & cladding joints
How we quote for external mastic
Your quote is based on your job. We take into account:
- Any mould that needs treating
- Working hours on commercial sites
- The size of the job
- Which sealant suits the joint
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you are not sure whether it needs doing, drop us a line at info@mrmastic.co.uk for an honest opinion and a quote.
Asking for a quote
Photos by email are helpful but not essential. Please mention:
- What’s wrong with the joints now
- If someone has resealed it before
- Roughly how big the job is
- Whether it’s a home or a business
To get a quote, drop us a line at info@mrmastic.co.uk with the location and a short description of the problem. You’ll have a clear quote before work begins.
What the job involves on each surface
Brickwork movement joints
Clay brickwork grows slightly over its life and moves with the weather. That movement goes into the joint, so the sealant in it must stay soft and stretchy.
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. We cut out the old sealant and reseal with a product suited to both surfaces.