Shetland Islands · Scotland
Sand Mastic in Gremista
Sand mastic across Gremista and nearby, with old sealant always removed completely and a one-year guarantee.
- Weathered mastic on the most exposed windows
- Wind and rain getting in round a sash window
- Gaps round a timber door in stone or brick
Sand mastic in Gremista, done properly
Sand mastic suits most period window surrounds. On modern frames we’d normally use a flexible sealant and we’ll explain which is best for yours. We’re often asked to deal with gaps where the frame meets the masonry and old cement repairs round a window that have failed, across tenement windows, brick reveals and sash and case windows.
Mastic can only go onto a dry joint, so outside work in Gremista depends on the weather, and longer journeys are planned in advance. Let us know about access to every frame, including any upstairs.
There’s a 12-month guarantee on every job.
- Where
- Gremista (ZE1)
- Wider area
- Shetland Islands
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- info@mrmastic.co.uk
- Updated
- 26 October 2026
What happens if it’s left?
Before painting the windows, it pays to renew the mastic. Painting over failed mastic does not seal it, and the new mastic is traditionally left unpainted. Out of town in Scotland, exposed walls take a lot of weather, and once water gets behind a failed joint, damp in stone or harled walls is slow to dry out.
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, plus any working-time requirements on site. Call for a quick quote and we will explain what it covers.
Why us?
- Fully insured
- 180+ five-star Google reviews
- One-year guarantee on every job
- Neat joints and a tidy finish
Take a look at our cost guide and our reviews.
What else we do in Gremista
What the job involves on each surface
Period and listed homes
Sand mastic is the like-for-like choice for many period homes. If your home is listed, ask your local planning authority about consent.
Tenement and terrace windows
Upper-floor windows need access planning. Tell us the height and we will confirm what’s needed.
Quotes for sand mastic in Gremista
The quote reflects the job in front of us. We look at:
- The number and length of the joints
- How many areas need sealing
- Working hours on commercial sites
- Whether there’s mould to deal with
Combining jobs into one visit usually makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. You will get one clear quote for the whole job.
Asking for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- A few photos by email, if you can
- Whether it has been sealed before
- Where the job is, and your postcode
- Access, such as stairs, a lift or height
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. When it suits you, send an email to info@mrmastic.co.uk.
Signs you need sand mastic in Gremista
Paint, silicone or cement used over old mastic causes problems. They don’t suit the joint and we normally remove them.
People usually contact us after spotting one of these:
- Gaps round a timber door in stone or brick
- Wind and rain getting in round a sash window
- Tired mastic found when preparing windows for paint
- Modern sealant on a period surround
Schools such as Anderson High School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
What your quote should include
- What product goes in the joint
- What the cure time is
- Who turns up on the day
- Whether all the old sealant comes out first
FAQs for Gremista
Do you cover Gremista for sand mastic?
Yes, Gremista is within the area we cover. Our work covers the whole of Scotland. You can send an email to info@mrmastic.co.uk and let us know what needs doing, and we will send you a clear quote.
Do you cover smaller places like Gremista?
Yes, smaller places are covered as well as towns. We work across all 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.
Do you work for hotels and businesses?
Yes. Commercial and hotel work is a large part of what we do. Working times can be discussed when we quote.
How do I get a quote for sand mastic in Gremista?
Every job is different, so each one gets its own quote. For a quick quote, drop us a line at info@mrmastic.co.uk with a short description of the job.
Should I check with the council before work on a listed or conservation-area home?
Check with your local planning authority. They’ll tell you if consent is needed for work to your windows.
Do you remove the old sealant?
Yes. All of the old material is cut out and the joint cleaned before resealing.
Are you an approved applicator?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Can tenants book the work?
Of course. Ask your landlord first, and we can send them the quote if that helps.
Landlord and commercial work in Gremista
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will give you a quote.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.
Aftercare tips
How long the joints last depends on use and care. We suggest:
- Check the mastic when you check the paintwork
- Sort the mastic before the decorators arrive
- Take care around the mastic when scraping paint
- Ask us before painting near the mastic
Look at the mastic when you look over the windows. Catching cracks early keeps repairs small.
Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens as more mastic falls out.
What sand mastic looks like in Gremista
Gremista is close to 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 older windows and doors, especially on the side facing the sea. Private landlords in Scotland must meet the Repairing Standard, which includes keeping a home wind and watertight, and failed outside joints work against that.
For an older house near a landmark such as St Margaret's Roman Catholic Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Gremista is about 1 mile north of Lerwick, in the Shetland Islands. Jobs in Gremista get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. 63 places in the Shetland Islands are on our list, from the larger towns to small villages.
Every address in ZE1 is within our area for sand mastic. That includes homes and businesses on Gremista Road, Arlanda Yard and Holmsgarth Brae. We also cover Heogan (1 mile east), Lerwick (1 mile south), Sound (2 miles south), Gunnista (2 miles east) and Veensgarth (2 miles west). Remote and island addresses need a little more planning, so tell us where you are when you ask for a quote.
Near you in Gremista
Typical jobs here are in homes near Gilbertson Park and the streets around them. Nearby you will also find Montfield Hospital (1.2 miles south) and Shetland Textile Museum (within half a mile south). The countryside around Gremista includes Loch of Kebister and Setter Hill.
What happens on the day
We work through the job in order: protect, prepare, seal, tidy. For most jobs that takes a few hours per window, depending on the condition of the joints and we leave things clean and tidy. Somewhere like Gremista may be a longer drive, and the journey is planned ahead. Mention tracks, gates, ferries or anything else about the route.
- 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.
Before we arrive
- For business premises, tell us about site rules or sign-in
- Let us know about parking restrictions
- Let us know about earlier repairs to the joints
Getting a quote
If you are in Gremista and need sand mastic, drop us a line at info@mrmastic.co.uk. Tell us what the problem is and where, and we will agree the price before any work begins.