Shetland Islands · Scotland
Gunnista Sand Mastic
Problem with your window and door surrounds in Gunnista? We cut out the old, prepare the joints and apply the right sealant.
- Old cement repairs round a window that have failed
- Gaps between timber frames and stone or brick
- Gaps round a timber door in stone or brick
Surface by surface
Period and listed homes
Materials matter on listed and conservation-area homes. Sand mastic is often the preferred finish.
Brick reveals
Gaps between frame and brick let in rain and draughts. Renewing the mastic closes it.
About our sand mastic in Gunnista
Sand mastic suits most period window surrounds. On modern frames we’d normally use a flexible sealant, and we’ll talk through which suits your home. Common call-outs are for a silicone bead on a sash window that spoils the look and tired mastic found when preparing windows for paint, across timber door frames, sash and case windows and period & listed homes.
Older stone-built homes in Scotland often have sash and case or timber windows set in stone. Those suit a traditional sand mastic or a neutral-cure sealant, not an acetoxy silicone that can attack some stone.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Place
- Gunnista (ZE2)
- Region
- Shetland Islands
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
What else we do in Gunnista
What we do, step by step
On the day, we look over the joints with you first. Surfaces next to the work are protected before any work begins. The work generally takes a few hours for a single window, longer for several. 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 surround is checked first.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic isn’t too thick.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
How to prepare
- Mention any sign-in or site rules at work premises
- Let us know if you’ve seen damp or leaks
- Tell us if parking is tricky
Ask for a quote
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we will explain what’s involved.
Advice
Frames and glazing around Gunnista
Gunnista is within about 1 mile of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on the mastic around older windows and doors, especially on the side facing the sea. Sash and case windows are common in older Scottish homes, and the joint between the box frame and the stone or render is traditionally pointed with sand mastic.
Homes close to St Ola's Church and burial-ground include some older properties, and the joint between an old wall and a newer frame is generally the first place rain gets in.
Gunnista is in the Shetland Islands. We provide sand mastic to homes and businesses in Gunnista and nearby, as part of our work across the Shetland Islands. 63 places in the Shetland Islands are on our list, from the larger towns to small villages.
Jobs for sand mastic in ZE2 works the same way as everywhere else we cover. We also cover the places around Gunnista: Heogan (1 mile west), Gremista (2 miles west), Grindiscol (2 miles south), Lerwick (2 miles south-west) and Sound (3 miles south-west). Remote and island addresses need a little more planning, so please mention your location when you email us at info@mrmastic.co.uk.
Landmarks near Gunnista
A little further out are Shetland Museum (2 miles south-west) and Montfield Hospital (2.2 miles south-west). The countryside around Gunnista includes Loch of Aith.
FAQs for Gunnista
Is Gunnista in your area for sand mastic?
Yes. We work across all of Scotland, and Gunnista is part of that. Just email us at info@mrmastic.co.uk with a few details of the job, and we will give you a clear quote.
Does living near the coast affect sand mastic in Gunnista?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. The right product, a clean joint and the right depth all help it cope.
Do you offer different sealant colours?
We’ll suggest a colour to suit the surroundings, from white and clear to greys and other shades. The product needed can limit the range.
What do you need from me for a quote?
A short description and the location, plus pictures if you have them. We will ask anything else we need to know.
Which products do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we will tell you what we are using.
I rent my home. Can I book you?
Yes. Check with your landlord; we can send the quote to them too.
Will it make a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
Will there be a smell?
Possibly a little. It fades as the sealant cures.
Aftercare tips
No joint lasts for ever, but care makes a real difference. A few tips:
- Plan mastic work ahead of painting
- Get any rot dealt with first
- Keep sills and gutters clear so water drains away
- Inspect the joints round the windows every year or so
Make sure water drains away from the window surround. Water sitting against the mastic shortens its life.
Good mastic helps keep the frame dry. Once it fails, water can sit against the timber, which can lead to rot.
When something else is needed
A few problems are outside what sealant work can do:
- Crumbling stone or brickwork round the window
- Sash cords, weights and draught-proofing of the sashes
- Decayed frames that need repair
Not sure which it is? You can drop us a line at info@mrmastic.co.uk and we will tell you honestly.
What we seal
- Stone surrounds
- Timber door frames
- Brick reveals
- Sash and case windows
- Tenement windows
- Period & listed homes
What affects the quote in Gunnista
Jobs vary more than people expect. The main factors:
- Mould in or behind the old joints
- The old material and how stubborn it is
- When we can work, for business premises
- How easy the joints are to reach
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all make a difference.
Asking for a quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- A few photos by email, if you can
- What’s wrong with the joints now
- Access, such as stairs, a lift or height
- How many joints, rooms or windows are involved
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Common problems we fix in Gunnista
Most of it is simply age. Sand mastic is a maintenance item like any pointing, depending on exposure and upkeep.
Most people get in touch after spotting one of these:
- Open joints round the window box
- Modern sealant on a period surround
- Patchy fillers round a sash window
- Old sand mastic that has cracked, crumbled or fallen out
Managing a site like Anderson High School? Then its window and door frames need their mastic kept sound, just like a home’s.
Comparing quotes
- The length of the guarantee
- Whether they seal over old material or remove it
- How hidden problems are handled
- What the quote includes, VAT included or not
Why it’s worth doing now in Gunnista
Not every filler suits an old window surround. Sand mastic matches what was there, which can matter on listed and conservation-area homes. 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.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, along with when we can work on site. Call for a quick quote and we’ll go through it with you.
Why choose Mr Mastic in Gunnista
- We are fully insured
- 180+ five-star Google reviews
- Old sealant always removed completely
- A 12-month guarantee on all work
Read what affects the cost or our reviews.