Shetland Islands · Scotland
External & façade joints in Hoswick, Shetland Islands
External mastic for Hoswick, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Panel joints letting water in
- Rain getting behind render or cladding at a joint
- Movement joints filled with mortar instead of sealant
External mastic for homes and businesses in Hoswick
Getting the depth right is half the job. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, so it bonds to the two sides only and can stretch. We work on brickwork movement joints, façade panels and joints between brick and frames, and people most often call us about joints with sealant missing in places and moss and dirt in joints with no sealant left.
Across smaller places in Scotland, stone and harled cottages, farm buildings and newer houses often stand exposed to wind and rain. Gutter joints and wall joints take a battering.
Whatever the size of the job, it’s backed by our one-year guarantee.
- Place
- Hoswick (ZE2)
- Region
- Shetland Islands
- Guarantee
- A year, on every job
- Price
- A clear price before we start
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
Surface by surface
Copings and trims
Metal and stone copings both move with temperature, so a flexible sealant suits them best year round.
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. That movement goes into the joint, so its sealant has to stay flexible.
Hoswick questions
Do you cover Hoswick for external mastic?
Yes. Our work covers the whole of Scotland, and Hoswick is part of that. Just drop us a line at info@mrmastic.co.uk with a few details of the job.
Is external mastic in a coastal place like Hoswick any different?
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. It’s worth checking the walls that face the sea first.
I’m a tenant. Can you help?
We can work for tenants, landlords or agents. Get your landlord’s agreement first.
Can new sealant go over the old?
No. New silicone will not bond to old silicone, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
How long will you be here?
It depends on the size of the job, but as a guide it takes a few hours to a few days, depending on the length of joint and the access. We’ll give you a better idea when we quote.
Will there be a smell?
Possibly a little. It fades as the sealant cures, and ventilation helps.
Where is Mr Mastic based?
We work from Crawley. We cover Hoswick and the rest of the Shetland Islands, along with the rest of our area.
Can you seal joints between render and window frames?
Yes. Different materials move at different rates, so the joint between them must be flexible. We choose one that suits both surfaces.
Aftercare tips
Simple care keeps the joints in good condition. We recommend:
- Look over the joints every year, ideally after winter
- Don’t let climbing plants root in the sealant
- Wash walls gently around the sealant
- Check the sealant is paintable before painting near it
Avoid pressure-washing straight into the joints. A strong jet can damage the edges of the bead and let water in behind.
Act while the splits are small. At that stage it’s a simple cut out and reseal with no damage behind it to deal with.
Towns and villages near Hoswick
More services for Hoswick
How it works
On the day, there’s very little for you to do. Show us the job and we will take it from there. The work itself takes a few hours to a few days, depending on the length of joint and the access, including the tidy-up. Somewhere like Hoswick may be a longer drive, and the journey is planned ahead. Mention tracks, gates, ferries or anything else about the route.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- Mention any tricky access
- Mention any parking rules near the property
- For indoor joints, keep the area dry beforehand if you can
How to get a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. When it suits you, drop us a line at info@mrmastic.co.uk.
Read more
Can I do it myself?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
What we cannot put right
It helps to know what we cannot do too:
- Subsidence or other structural problems
- Adding movement joints to masonry that has none
- Cracked brickwork or render that needs a builder or plasterer
Not sure which it is? You can email us at info@mrmastic.co.uk and we will tell you honestly.
Where we work in Hoswick
- Façade panels
- Render & cladding joints
- Copings & trims
- Brickwork movement joints
- Joints between brick and frames
- Concrete & block
Why deal with it now?
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That matters on brick, render and concrete, which can be weaker at the face. Too stiff a sealant can pull at the edges and break them. 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.
Leaving a failed joint usually makes the job bigger, not smaller, as water and mould keep getting in. If you are unsure, email us at info@mrmastic.co.uk and we will give you an honest view and a quote.
What you get with us
- Every job guaranteed for a year
- Colour picked to suit the job
- More than 20 years in sealant work
- Anti-fungal silicone where joints get wet
Take a look at what affects the cost and what customers say.
What affects the cost of external mastic
Jobs vary more than people expect. The main factors:
- Which sealant suits the joint
- Whether old sealant or filler has to be cut out
- Any working-time requirements on site
- Whether the work is at height
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Asking for a quote
To make quoting easier, let us know:
- The rough size of the job
- Where the property is
- If it’s domestic, commercial or a hotel
- The problem you’ve noticed
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we will talk you through the work before giving you a price.
Outside joints around Hoswick
Hoswick 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 is hard on movement joints and outside wall joints, especially on the side facing the sea. Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and failed outside joints work against that.
In and around Hoswick, as anywhere, good external mastic starts with a clean, dry, properly prepared joint. Whether the job is in Hoswick itself or nearby, the right material for each joint matters as much as a neat finish.
Hoswick is about 11 miles south of Lerwick, in the Shetland Islands. For external mastic in and around Hoswick, it’s easy to get a quote: please drop us a line at info@mrmastic.co.uk. We’re based in Crawley and cover the Shetland Islands. Hoswick is one of 63 places in the Shetland Islands where we work for external mastic.
Jobs for external mastic in ZE2 is quoted and booked the same way as anywhere else. You’ll find streets such as Greenfield Road and Brakefield Road, and we cover them all. Close by, we work in Sandwick (1 mile east), Levenwick (2 miles south), Bigton (3 miles south-west), Mail (3 miles north) and Bremirehoull (3 miles north). Within a short drive, we also cover Lerwick (11 miles north), Sound (11 miles north) and Scalloway (10 miles north). 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.
What’s near Hoswick
For a walk, there’s Loch of Vatsetter.