Shetland Islands · Scotland
Window & door mastic in Firth, Shetland Islands
Window mastic across Firth and nearby, with old sealant always removed completely and a 12-month guarantee.
- Rain getting in at the frame or under the sill
- Rushed sealant from a window installation
- Sealant in the wrong colour for the frame
Firth questions
Can you do window mastic in Firth?
Yes. Our work covers the whole of Scotland, and Firth is part of that. Just drop us a line at info@mrmastic.co.uk with a few details of the job, and we’ll give you a clear price.
Do you cover smaller places like Firth?
Yes. Firth is within the area we cover, which takes in towns, villages and rural addresses. 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.
Will new mastic stop draughts?
It will if the frame joint is the problem. We find where the air is coming from before we reseal.
Can new window sealant be painted?
Silicone generally won’t take paint. Let us know beforehand, and we will use a paintable product where it suits.
Are you insured?
Yes, we are fully insured for domestic and commercial work.
What do you need from me for a quote?
Let us know what needs doing and where, with photos by email if possible. We will ask anything else we need to know.
Can you reach windows above the ground floor?
Yes, if safe access is possible. For high or awkward windows, we’ll tell you what access is needed.
Do you seal inside as well as outside?
Yes, we do both. Indoors, we seal between the frame and the plaster or reveal, using a paintable sealant if you want to decorate.
Window mastic in Firth
Around Firth we seal all kinds of frames: from uPVC casements to timber and aluminium, plus patio doors, French doors and sills. The sealant is chosen to suit the frame material and the wall. Common call-outs are for gaps between the frame and the inside reveal and gaps left after new windows were fitted, across timber windows & doors, composite doors and aluminium frames.
Across smaller places in Scotland, homes range from stone and harled cottages to newer houses, many standing in the open. Exposed frames and sills take the full force of wind-driven rain, so the mastic there works hard.
Big or small, it’s backed by our one-year guarantee in Firth and across the Shetland Islands.
- Where
- Firth (ZE2)
- Region
- Shetland Islands
- Cover
- A year, on every job
- Price
- A clear quote up front
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
Work for landlords, hotels and businesses
Hotels need rooms back in use, 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.
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
What we can’t put right
Sealant isn’t the answer to every problem, and we will tell you before work begins. It won’t solve:
- Faulty window hardware
- A failed sealed unit that has misted up
- Rotten timber, which needs a joiner first
If you are not sure, just drop us a line at info@mrmastic.co.uk and we will give you a straight answer.
Where we work in Firth
- Composite doors
- uPVC windows
- Patio & French doors
- Aluminium frames
- Window sills
- Timber windows & doors
What else we do in Firth
DIY sealant or a professional job?
A DIY attempt does not rule out a professional job. We cut it out and start again.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
What affects the quote in Firth
For a quick quote, just ask. The main things that affect it are:
- How many areas need sealing
- Mould in or behind the old joints
- Whether the work is at height
- The type of sealant required
Combining jobs into one visit is normally more efficient than separate visits. We will give you a clear price for the lot.
Helping us quote
What to tell us when you ask for a quote:
- A few photos by email, if you can
- Access, such as stairs, a lift or height
- Any previous sealing or DIY work
- What the problem is, such as mould, gaps, leaks or cracking
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email photos if that’s easy.
Why deal with it now?
Draughts and leaks don’t always mean new windows. If the frames and glass are in good order, resealing the joints is often all that’s needed. If we find failed glass units or worn seals, we will tell you. When the nearest tradesperson is a drive away, it’s tempting to leave a small leak, but water behind a failed seal does the most damage when nobody’s watching.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, plus any working-time requirements on site. Call for a quick quote and we’ll go through it with you.
Why choose Mr Mastic in Firth
- Experience in homes, commercial sites and hotels
- An ARBOMaster approved applicator
- Trusted Arbo and Everbuild sealants
- Tidy, careful work
Read what affects the cost and our reviews.
Windows and doors in Firth
Firth is within about 2 miles of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That’s hard on the mastic around window and door frames, especially on the side facing the sea. Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and sound outside sealant is part of that.
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. Every kind of property in Firth is covered for window mastic. Every job comes with our one-year guarantee. Firth is one of 63 places in the Shetland Islands where we work.
All of ZE2 is covered for window mastic, from the main roads to the quietest streets. Whether your property is on Midlea, Leaside and Sandside or anywhere close by, we can help. Neighbouring places we cover for window 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). Island and remote addresses take a little more planning, so tell us where you are when you ask for a quote.
Around Firth
Green spaces nearby include Loch of Bordigarth.
The process
We keep the work tidy and contained to the joints we are treating, so you can carry on as normal. Expect the work to take most of a day for a typical house, less for a few frames. 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.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- A flexible exterior sealant is applied in a colour to suit the frame.
- We tool each bead neatly and check every joint is closed.
How to prepare
- Let us know about parking restrictions
- Clear the area around the work
- Try not to wet indoor joints just before the visit
Getting a quote
Want a quote for window mastic? Please send an email to info@mrmastic.co.uk with a few details. We will explain what we’d do and give you a clear price before we start.
Related advice
When to call us in Firth
Water runs down the glass onto the sill, so the sill ends and the joint below the frame are common leak points. Failed sealant there lets rain into the wall or behind the frame.
Keep an eye out for any of the following:
- Gaps where the sill meets the wall
- Gaps left after new windows were fitted
- Mastic that is falling out in pieces
- Cold air getting in at the frame edge
Around Firth, as everywhere, window mastic is only as good as the preparation behind it.
What your quote should include
- Whether VAT is included
- What product goes in the joint
- Who does the work, and how experienced they are
- How the surfaces are prepared before sealing