Na h-Eileanan Siar · Scotland
North Dell Window Mastic
Mastic around window and door frames, sills and patio doors for householders, landlords and businesses in North Dell. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Old mastic that has gone black or come away
- Water coming in at the bottom corners of a door
- Draughty joints inside around the window
Window mastic in North Dell, done properly
Most frames have an outside joint and an inside one. Outside, the mastic keeps rain out; the internal joint closes the gap to the plaster and stops draughts. We seal one or both, depending on what’s needed. We’re often asked to deal with leaking joints at the ends of sills and a bead that doesn’t match the frame, across composite doors, timber windows & doors and window sills.
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.
Each job carries a 12-month guarantee, whatever its size.
- Place
- North Dell (HS2)
- Wider area
- Na h-Eileanan Siar
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
What the job involves on each surface
uPVC windows
Plastic frames move a lot between a hot afternoon and a cold night, so the joint needs a low-modulus sealant that stays flexible. We match white, brown, anthracite grey and black frames.
Aluminium frames
Large aluminium doors have long joints down each side and across the head, and the bottom joint sees the most water. We prepare and reseal every joint, backing the deep ones.
For landlords and businesses
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Landlords and agents in North Dell can book us as well as householders. Resealing between tenancies keeps a property looking cared for before the next move-in.
Window mastic in North Dell: local notes
North Dell 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. Both are hard on the mastic around window and door frames, which can dry out and crack sooner where a building faces the weather. On the islands, wind and salt spray are hard on outside sealant.
In the older streets around Church of Scotland, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Around North Dell, as everywhere, window mastic is only as good as the preparation behind it.
North Dell is about 18 miles north of Stornoway, in Na h-Eileanan Siar. Whether you’re in the middle of North Dell or further out, window mastic is available for homes and businesses alike. North Dell is one of 87 places in Na h-Eileanan Siar we cover.
All of HS2 is within our area for window mastic. We also cover Cross (1 mile east), Nis (2 miles east), Ness (2 miles east), Lìonal (2 miles north-east) and Lionel (2 miles north-east). Island and remote addresses take a little more planning, so please mention your location when you drop us a line at info@mrmastic.co.uk.
Around North Dell
A little further out are Comunn Eachdraidh Nis (under half a mile east). The countryside around North Dell includes Loch Langavat.
Why it’s worth doing now in North Dell
Running fresh sealant over the old joint is tempting, but new sealant can’t bond to old, crumbling mastic. It peels before long, and water still gets in behind. The old mastic has to come out. In an older home around North Dell, damp from a failed joint can get into timber and plaster, which is a far bigger job than the sealant.
The cost depends on the size of the job, 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 North Dell
- Tidy, careful work
- 20+ years of sealant experience
- A 12-month guarantee on all work
- An ARBOMaster approved applicator
Read our cost guide or customer reviews.
How it works
You do not need to clear the whole room or building, only the area right around the joints. Everything nearby is protected, and the work takes a morning for a couple of windows and a door in most cases. In smaller Scottish places, parking is generally less of an issue than access and distance. Let us know how to find you and how to reach the joints, and the visit is planned around that.
- First, we confirm safe access to each frame.
- All the failed sealant is cut away, along with any loose debris.
- Frame and wall are cleaned and must be dry before sealing.
- Deep voids are backed, then the sealant is gunned in.
- The joint is shaped to shed water and the area tidied.
Preparing for the visit
- Mention any parking rules near the property
- Mention any tricky access
- Keep children and pets away from the work area
How to get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. Whenever you are ready, email us at info@mrmastic.co.uk.
Advice
Should I try it myself first?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
Also in North Dell
North Dell: your questions answered
Does the coastal weather in North Dell affect outside sealant?
Coastal homes put outside sealant through more weather than inland ones, so the choice of sealant and the preparation matter even more. Walls facing the sea are normally the first to need attention.
Do you cover North Dell for window mastic?
Yes, North Dell is within the area we cover. Our work covers the whole of Scotland. Just drop us a line at info@mrmastic.co.uk with a few details of the job.
Should I try DIY first?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. If it doesn’t work out, we can redo it.
Is there any odour?
It depends on the product. Some smell for a while, some hardly at all, and any smell fades as they cure.
Do you take out the old sealant first?
Yes. We cut out all the old sealant and clean the joint before resealing.
What do you put in the joint?
Products from Arbo and Everbuild, among others, picked for each joint. We will tell you what we’re using and why.
Can you work on commercial sites?
Yes. Hotels, offices and other businesses use us.
I’m a tenant. Can you help?
We’re happy to deal with the tenant, landlord or agent. Get your landlord’s agreement first.
What affects the cost of window mastic
Your quote is based on your job. We look at:
- Any working-time requirements on site
- Whether there’s mould to deal with
- The type of sealant required
- How much there is to do
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
What to tell us for a quote
To help us quote quickly, please include:
- Whether it has been sealed before
- Roughly how big the job is
- If it’s domestic, commercial or a hotel
- Where the property is
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.
How to look after the new joints
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Clean frames with a soft cloth and soapy water
- Don’t aim a pressure washer at the joints
- Look round the frames every year or so
- Do not use solvent cleaners on the joint
Most silicone sealants will not take paint, so mention any painting plans before we start. There are paintable sealants for joints that need it.
Leaks normally show up in wet, windy weather, but resealing works best in dry conditions. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.