Na h-Eileanan Siar · Scotland
External Mastic in Steinis
Sealing brickwork movement joints, render, cladding and façade joints in Steinis, with a 12-month guarantee on every job. Call for a quick quote.
- Leaking joints around cladding and façade panels
- Rigid filler in a joint that should flex
- Joints where the bead has come unstuck
What we do, step by step
You don’t need to clear the whole room or building before we come, only the area right around the joints. We protect the rest, and the job takes a few hours to a few days, depending on the length of joint and the access for a typical job. 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, and the visit is planned around that.
- First we look over the joints with you, agree which to renew and talk through access.
- The old mastic and anything lodged in the joint is removed.
- We clean both faces of the joint and prime them where the product calls for it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Before we arrive
- Mention any leaks or damp you’ve noticed
- Keep children and pets away from the work area
- Mention if the joints have been sealed before
Getting a quote
For a quote, email us at info@mrmastic.co.uk with the location and a short description of the problem. We will send you a clear quote before any work starts.
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How we handle external mastic in Steinis
Joints in render and cladding are easy to overlook until a damp patch appears. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant in a matching colour. Typical jobs include leaking joints around cladding and façade panels and water getting into walls through failed joints, on concrete & block, joints between brick and frames and copings & trims.
Older stone buildings need a sealant that suits the stone, not an acetoxy product that can mark or attack it. Newer houses need their movement joints and roofline trims kept sound.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Location
- Steinis (HS2)
- Wider area
- Na h-Eileanan Siar
- Cover
- A year, on every job
- Quote
- A clear price before work begins
- info@mrmastic.co.uk
- Updated
- 26 October 2026
What we’re called out for in Steinis
Sunlight, wet weather and frost wear exterior sealant down. In time it goes hard, crazes on the surface and stops stretching, so the joint eventually tears or comes away from one side.
It’s worth asking for a quote if you see:
- Gaps where render, brick and frames meet
- Brick movement joints where the sealant has split
- Rain getting behind render or cladding at a joint
- Joints pointed up with cement by mistake
For jobs in and around Steinis, choosing the right material for each joint is as important as a tidy finish.
What to look for in a quote
- Whether all the old sealant comes out first
- How the colour is chosen
- How much experience the applicator has
- How the joint is cleaned and prepared
External mastic in Steinis: local notes
Steinis 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 movement joints and outside wall joints, especially on the side facing the sea. Island weather, with its wind and salt spray, is tough on movement joints and outside wall joints.
Around Steinis, as everywhere, external mastic is only as good as the preparation behind it.
Steinis is in Na h-Eileanan Siar. Whether you’re in the middle of Steinis or further out, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Steinis is one of 87 towns and villages in Na h-Eileanan Siar where we work for external mastic.
All of HS2 is within our area for external mastic. Other places close to Steinis include Plasterfield (1 mile south-west), Sandwick (1 mile south), Sanndabhaig (1 mile south), Stornoway (1 mile west) and Branahuie (1 mile south-east). For island and remote addresses, the job takes a little more planning, so mention it when you ask for a quote.
Landmarks near Steinis
Other landmarks nearby include Western Isles Hospital (1.3 miles west) and Lewis Loom Centre (1.5 miles west). The countryside around Steinis includes Loch Àirigh na Lic.
Landlords, agents and businesses in Steinis
Letting agents often deal with us directly. Tell us the address, the job and how access works and we’ll quote.
If you manage several properties in or around Steinis, several properties can be quoted together. Send us the addresses and the work at each.
Can I do it myself?
If you’ve already had a go yourself, that is fine. We cut it out and start again, so tell us about it when you ask for a quote.
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, and the work is guaranteed for a year.
Nearby places to Steinis
More services for Steinis
When something else is needed
To be straight with you, some problems need a different trade:
- Structural movement, which needs a surveyor or engineer
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Adding movement joints to masonry that has none
Not sure which it is? You can send an email to info@mrmastic.co.uk and we will tell you honestly.
What we seal
- Joints between brick and frames
- Copings & trims
- Brickwork movement joints
- Concrete & block
- Render & cladding joints
- Façade panels
Your questions about external mastic in Steinis
Does the coastal weather in Steinis affect outside sealant?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. The right product, a clean joint and the right depth all help it cope.
Is Steinis within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers the whole of Scotland, including the islands, where work is planned around ferry crossings. Just mention lanes, gates or anything else about the route when you book.
How long does the job take?
It depends on the size of the job, but as a guide it takes anything from a few hours to several days, depending on the building. We will give you a better idea when we quote.
Can you seal joints between render and window frames?
Yes. The old joint is removed, both surfaces cleaned and primed where needed, and a flexible sealant applied. The colour is chosen to suit.
Is it OK to fill a movement joint with cement?
No, not where the gap is a movement joint. Filling it with mortar defeats its purpose and can lead to cracking. We will reseal it with a flexible sealant.
Do you take out the old sealant first?
Yes, always, and completely. New sealant won’t bond properly to old, so the joint is cleaned back first.
When is the sealant fully cured?
It depends on the product. Before we leave, we’ll tell you the cure time.
Which products do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Different surfaces, different methods
Brickwork movement joints
People sometimes point up a brick movement joint by mistake. If that’s happened, we rake it out and reseal it properly where it can be done safely.
Copings and trims
Coping and trim joints face rain and sun head on. Each is resealed with a weatherproof, flexible sealant.
Quotes for external mastic in Steinis
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Whether old sealant or filler has to be cut out
- When we can work, for business premises
- The number of rooms or windows
- How much there is to do
Doing several joints on one visit is normally more efficient than separate visits, so it’s worth mentioning everything you’d like done. We will give you a clear quote for the lot.
What to tell us for a quote
Photos help, but a description is a good start. Try to tell us:
- Photos by email, if that’s easy
- The type of property
- How many joints, rooms or windows are involved
- Whether it has been sealed before
There’s no standard price list, because every job is different. Instead, we send you a clear quote for your job. To get started, drop us a line at info@mrmastic.co.uk.