Shetland Islands · Scotland
Firth Sand Mastic
Problem with your window and door surrounds in Firth? We cut out the old, prepare the joints and apply the right sealant.
- Failed mastic on an exposed elevation
- Wind and rain getting in round a sash window
- Cracked mastic round a front door frame
Quotes for sand mastic in Firth
Jobs vary more than people expect. The main factors:
- How easy the joints are to reach
- How many rooms, windows or areas are involved
- Whether there’s mould to deal with
- How much old sealant there is and how hard it is to remove
We don’t show prices on the website, because each job is priced on what it involves. For a quick quote, please email us at info@mrmastic.co.uk and we’ll talk you through it.
What we need to know
When you call or email, these details help:
- The type of property
- The rough size of the job
- The problem you’ve noticed
- Photos by email, if that’s easy
We quote each job on its own, so start by telling us what you need. Just email us at info@mrmastic.co.uk with the details, and photos are welcome.
Sand mastic in Firth, done properly
Silicone on a period window often looks wrong and does not suit the building. Sand mastic is the traditional choice and we can swap the silicone for it. We’re often asked to deal with modern sealant on a period surround and gaps between timber frames and stone or brick, on period & listed homes, tenement windows and timber door frames.
Across smaller places in Scotland, homes range from stone and harled cottages to newer houses, many standing in the open. Wind-driven rain finds any gap around a frame or sill.
Every job comes with our 12-month guarantee.
- Place
- Firth (ZE2)
- Wider area
- Shetland Islands
- Guarantee
- 12 months on all our work
- Quote
- A clear price before work begins
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Other services in Firth
For landlords and businesses
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we’ll give you a quote.
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
What happens if it’s left?
Before painting the windows, it pays to renew the mastic. Paint over cracked mastic will not stop the gaps, and the new mastic is traditionally left unpainted. 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.
Leaving a failed joint normally makes the job bigger, not smaller, as water and mould keep getting in. If you are unsure, send an email to info@mrmastic.co.uk and we will give you an honest view and a quote.
What you get with us
- Trusted Arbo and Everbuild sealants
- 20+ years of sealant experience
- Rated 4.9 stars on Google
- Any old sealant cut out fully, not covered over
FAQs for Firth
Does the coastal weather in Firth affect outside sealant?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Do you cover Firth for sand mastic?
Yes, Firth is within the area we cover. We work across all of Scotland. You can send an email to info@mrmastic.co.uk and tell us what needs doing, and we will give you a clear price.
Do you offer different sealant colours?
In most cases you can choose. We’ll tell you which colours the right product comes in.
What information do you need?
Tell us what needs doing and where, plus photos if you have them. We will ask anything else we need to know.
I’m a tenant. Can you help?
We can work for tenants, landlords or agents. Just make sure your landlord agrees.
Is the work guaranteed?
You get our one-year guarantee on every job.
How do I get a quote for sand mastic in Firth?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. You’ll get a clear quote before work begins.
Is sand mastic better than silicone for my windows?
For period timber windows in stone or brick, sand mastic is often the better fit. On modern frames, we’d normally use a flexible sealant, and we’ll explain why.
How to look after the new joints
How long the joints last depends on use and care. Here’s what we suggest:
- Keep sills and gutters clear so water drains away
- Ask a joiner to look at soft timber first
- Inspect the joints round the windows every year or so
- Ask us before painting near the mastic
Do not touch or press the mastic while it hardens. It skins over quickly, but takes longer to harden fully.
Renewing mastic before redecorating saves doing it twice. Paint over cracked mastic only covers it up.
How the visit works
Once we’re on site, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. After that, the work takes a few hours per window, depending on the condition of the joints. Outside jobs in Firth need a dry day, because sealant won’t bond to a wet joint, so an outdoor job can move if the forecast changes. Work indoors isn’t affected.
- Each surround is checked first.
- The joint is raked out and cleaned.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
How to prepare
- Let us know if you’ve seen damp or leaks
- Clear items away from the joints we’re working on
- Tell us about access, such as stairs, a lift or high-level joints
Get a quote
If you are in Firth and need sand mastic, email us at info@mrmastic.co.uk. A short description of the job and where it is helps us quote, and you’ll get a clear quote before work begins.
Read more
What sealant work cannot fix
We’d rather tell you now than do work that won’t last, so here’s what sealant cannot put right:
- Whether work needs listed building consent
- Sashes that rattle, stick or won’t open
- Masonry that needs repairing
If you are not sure, just drop us a line at info@mrmastic.co.uk and we’ll give you a straight answer.
Where we work in Firth
- Tenement windows
- Stone surrounds
- Timber door frames
- Sash and case windows
- Brick reveals
- Period & listed homes
Frames and glazing around Firth
Firth 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. Many older homes in Scotland have sash and case windows, often pointed into the wall with traditional sand mastic.
Whether the job is in Firth itself or nearby, the right material for each joint matters as much as a neat finish. In and around Firth, as anywhere, good sand mastic starts with a clean, dry, properly prepared joint.
Firth is in the Shetland Islands. From the centre of Firth to the outskirts, sand mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Across the Shetland Islands, we cover 63 places, Firth among them.
We cover every part of ZE2 for sand mastic and the streets around it. Sand mastic is available to properties on Midlea, Leaside and Sandside and the roads around them. Close by, we work in Mossbank (1 mile north-east), Scatsta (4 miles west), Vidlin (6 miles south), Sullom (6 miles west) and Burravoe (6 miles north-east). Remote and island addresses need a little more planning, so please mention your location when you drop us a line at info@mrmastic.co.uk.
Landmarks near Firth
Not far away are Loch of Bordigarth.
How the job changes by surface
Tenement and terrace windows
Upper-floor windows need access planning. Tell us the height and we’ll confirm what’s needed.
Stone surrounds
We take care not to mark the stone while raking out the old mastic.