Shetland Islands · Scotland
Sand Mastic in Lerwick
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for householders, landlords and businesses in Lerwick. Fully insured, ARBOMaster approved and guaranteed for a year.
- Gaps round a timber door in stone or brick
- A silicone bead on a sash window that spoils the look
- Mastic that needs renewing before redecorating
Signs you need sand mastic in Lerwick
Over the years, sand mastic weathers. It dries out, cracks and loses its grip on the stone or timber.
Keep an eye out for any of the following:
- Mastic dropping out of the joint
- Gaps round a timber door in stone or brick
- Tired mastic found when preparing windows for paint
- Failed mastic on an exposed elevation
Managing a site like Anderson High School? Then larger buildings have plenty of frames, and the mastic around each one ages.
Questions to ask before you book
- What happens if the job turns out different
- Whether you can choose the colour
- What the cure time is
- How the surfaces are prepared before sealing
Sand mastic for homes and businesses in Lerwick
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s made from sand and a linseed-oil-based binder, applied by hand. On period homes, it looks right where silicone wouldn’t. If you have wind and rain getting in round a sash window and old cement repairs round a window that have failed, we can help, on stone surrounds, brick reveals and tenement windows alike.
Mastic can only go onto a dry joint, so outside work in Lerwick depends on the weather, and longer journeys are planned in advance. Let us know about access to every frame, including any upstairs.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Where
- Lerwick (ZE1)
- Region
- Shetland Islands
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Also near Lerwick
What else we do in Lerwick
Different surfaces, different methods
Stone surrounds
Sand mastic sits naturally against stone. It finishes to look like part of the surround.
Tenement and terrace windows
Tenements and terraces often have many sash windows with ageing mastic. We can do one window or several.
Landlords, agents and businesses in Lerwick
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
How the visit works
Most of a good job is in the preparation, so that’s where we spend the time. Every joint is cleaned and dried before new material goes in. In total, it generally takes a few hours per window, depending on the condition of the joints. Around Lerwick, distance and access matter more than parking. Let us know how to find you and how to reach the joints.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
How to prepare
- Mention any parking rules near the property
- Clear items away from the joints we are working on
- Mention if the joints have been sealed before
Ask for a quote
For sand mastic in Lerwick, email us at info@mrmastic.co.uk. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
Related advice
Frames and glazing around Lerwick
Lerwick is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and failed outside joints work against that.
In the older streets around St Margaret's Roman Catholic Church, the joint between an old wall and a newer frame is generally the first place rain gets in.
Lerwick is in the Shetland Islands. We provide sand mastic to homes and businesses in Lerwick and the surrounding area. Lerwick is one of 63 towns and villages in the Shetland Islands where we work for sand mastic.
Postcode districts we cover here for sand mastic: ZE1. If you need sand mastic at a property on High Street, Market Street and Church Road or anywhere close by, we can help. With the A969 and A970 close by, Lerwick is simple for us to get to. Other places close to Lerwick include Sound (1 mile south-west), Gremista (1 mile north), Heogan (1 mile north-east), Grindiscol (2 miles south-east) and Gunnista (2 miles north-east). Lerwick is among the bigger towns we cover in the Shetland Islands. Island and remote addresses take a little more planning, so tell us where you are when you ask for a quote.
What’s near Lerwick
Around Lerwick, our work takes us to homes and buildings near Gilbertson Park and Grand Hotel, among other places. Nearby you’ll also find Gilbert Bain Hospital (within half a mile south) and Shetland Museum (within half a mile north-east). The countryside around Lerwick includes Setter Hill and Clickimin Loch.
Why deal with it now?
New mastic over crumbling mastic will not hold. We remove the loose material first so the new work lasts. When the nearest tradesperson is a drive away, it’s tempting to leave a small leak, but water through a failed joint keeps working away until it’s fixed.
There are no prices on our website, because each job is priced on what it involves. Call for a quick quote and we will talk you through it.
Why book with us
- Every job guaranteed for a year
- Full insurance on every job
- 4.9 on Google from 180+ five-star reviews
- We never seal over old sealant
Take a look at how sealant jobs are priced and our reviews.
Your questions about sand mastic in Lerwick
Does living near the coast affect sand mastic in Lerwick?
Coastal homes put outside sealant through more weather than inland ones, so preparation and the right sealant matter all the more. It’s worth checking the walls that face the sea first.
Is Lerwick in your area for sand mastic?
Yes. Our work covers the whole of Scotland, and Lerwick is part of that. Just send an email to info@mrmastic.co.uk with a few details of the job.
How long does sand mastic take?
Typically it takes anything from a few hours to a full day, depending on how many windows. Larger jobs naturally take longer, and we’ll say how long yours will take.
Do the sealants smell?
Sometimes, a little. It fades as the sealant cures.
How do I get a quote for sand mastic in Lerwick?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Do you offer different sealant colours?
Generally, yes. Sealants come in white, clear, grey and other colours for many products, and we agree the colour with you before any work starts.
Is the work guaranteed?
All our work has a 12-month guarantee.
How long does sand mastic take to go off?
It skins over fairly quickly but takes longer to harden fully. We’ll explain what to expect before we leave.
Should I try it myself first?
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
How we quote for sand mastic
Call for a quick quote. What matters most is:
- The product the joint needs
- How much old sealant there is and how hard it is to remove
- The size of the job
- Mould in or behind the old joints
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
Helping us quote
When you call or email, it’s useful to know:
- Any previous sealing or DIY work
- The problem you’ve noticed
- Roughly how big the job is
- A few photos by email, if you can
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll explain how we’d tackle it. When it suits you, send an email to info@mrmastic.co.uk.