Orkney Islands · Scotland
Grimbister Window Mastic
Window mastic for Grimbister, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Rushed sealant from a window installation
- Damp patches on the reveal after heavy rain
- Cracked or shrunken mastic around the frame
Window mastic in Grimbister, done properly
Homes in Grimbister have every kind of window: uPVC, aluminium, timber and composite, along with patio doors, French doors and sills. The sealant is chosen to suit the frame material and the wall. We work on aluminium frames, timber windows & doors and composite doors, and people most often call us about whistling draughts around closed windows and a bead that doesn’t match the frame.
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, so the mastic there works hard.
A 12-month guarantee comes as standard, so you are not left on your own once the job is done.
- Where
- Grimbister (KW15)
- Region
- Orkney Islands
- Cover
- One year on every job
- Quotes
- A clear price before any work starts
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
What we do, step by step
You don’t need to clear the whole room or building, just the space around the work. Everything nearby is protected, and the work takes a few hours for a few frames, or a day or more for a whole house for a typical job. Somewhere like Grimbister may be a longer drive, and the journey is planned ahead. Mention tracks, gates, ferries or anything else about the route.
- 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.
- Every joint is tooled smooth and checked before we leave.
Getting ready for the visit
- Let us know if you’ve seen damp or leaks
- Clear items away from the joints we are working on
- Keep pets and children clear of the area while we work
How to get a quote
Every job is quoted individually, so the first step is telling us about yours. Just send an email to info@mrmastic.co.uk with the details, and photos are welcome.
Related advice
Why it’s worth doing now in Grimbister
Once mastic fails, rain can get between the frame and the wall. Left long enough, it can stain inside walls, spoil plaster and rot wooden frames. Resealing now is a small job by comparison. In an older home around Grimbister, damp from a failed joint can get into timber and plaster.
What it costs depends on the amount of work, how much old material has to come out and access to the work. You will have a clear quote before any work starts.
Why choose Mr Mastic in Grimbister
- Over 20 years’ experience
- Fully insured
- Tidy, careful work
- Sealant colour chosen to suit
DIY versus a professional finish
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
If you’ve already had a go yourself, that’s fine. We cut it out and start again, so tell us about it when you ask for a quote.
When to call us in Grimbister
Older frames were often sealed with products that set hard. Once it has hardened, the frame’s movement tears it from the wall, and a gap opens along one edge.
Keep an eye out for these signs:
- Whistling draughts around closed windows
- Cracked sealant at the sill ends
- Hard, cracked sealant around windows
- Draughty joints inside around the window
For jobs in and around Grimbister, choosing the right material for each joint is as important as a tidy finish.
Before booking anyone
- Whether VAT is included
- Who turns up on the day
- Which sealant they’ll use, and why
- What happens if the job turns out different
When it isn’t the sealant
In fairness, there are a few things sealant will not fix:
- A door that needs adjusting, rehanging or new seals
- Broken hinges, locks or handles
- Penetrating damp from a failed cavity tray or render
Not sure which it is? You can send an email to info@mrmastic.co.uk and we’ll tell you honestly.
Where we work in Grimbister
- Patio & French doors
- Composite doors
- Timber windows & doors
- uPVC windows
- Window sills
- Aluminium frames
Aftercare tips
No joint lasts for ever, but care makes a real difference. A few tips:
- Ventilate rooms so frames do not stay wet inside
- Avoid harsh chemicals near the mastic
- Clean frames with a soft cloth and soapy water
- Keep jet washers away from the mastic
Wipe the frames with soapy water when you clean the windows, and keep solvents and harsh chemicals off the joint.
A small gap around a frame only grows. As the old mastic shrinks further, more air gets through, and heat escapes around the frame. Resealing closes it.
Questions from Grimbister
Does living near the coast affect window mastic in Grimbister?
Near the sea, outside joints face more wind, rain and salt than they would inland, so preparation and the right sealant matter all the more. Walls facing the sea are normally the first to need attention.
Can you do window mastic in Grimbister?
Yes, Grimbister is within the area we cover. We work across all of Scotland. Just email us at info@mrmastic.co.uk with a few details of the job.
Are you ARBOMaster approved?
Yes. We hold ARBOMaster approved applicator status.
Can I paint over the new sealant?
Silicone generally will not take paint. Let us know beforehand, and we will use a paintable product where it suits.
What information do you need?
The location, the problem and the rough size of the job. Photos by email help too.
Do you have insurance?
Yes, we are fully insured for every job we do.
Do you guarantee window mastic?
Yes. All our work carries a 12-month guarantee, and we’re ARBOMaster approved applicators.
What sealant do you use?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference, and we will explain our choice.
What the job involves on each surface
Composite doors
An exposed front door gets wind-driven rain, and the top and bottom corners tend to fail first. We pay most attention there.
Window sills
Masonry sills can have joints where water gets in, including the one between the sill and the frame above. Those are sealed with a product suited to stone or concrete.
Also in Grimbister
Windows and doors in Grimbister
Grimbister is within about 1 mile of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That is hard on the mastic around window and door frames, especially on the side facing the sea. Island weather, with its wind and salt spray, is tough on the mastic around window and door frames.
Around Grimbister, as everywhere, window mastic is only as good as the preparation behind it.
Grimbister is about 5 miles west of Kirkwall, in the Orkney Islands. Whether you are in the middle of Grimbister or further out, we cover window mastic for every kind of property. Grimbister is one of 51 places in the Orkney Islands we cover for window mastic.
We work across the KW15 postcode area for window mastic. Other places close to Grimbister include Finstown (1 mile north-west), Heddle (1 mile west), Germiston (2 miles south-west), Kirbister (4 miles south) and Norseman (4 miles north). If you are somewhere remote, the job takes a little more planning, so mention it when you ask for a quote.
Landmarks near Grimbister
Nearby you will also find Balfour Hospital (4.9 miles east) and Kirkwall Castle (4.9 miles east). The countryside around Grimbister includes Loch of Wasdale and Hill of Heddle.