Na h-Eileanan Siar · Scotland
External & façade joints in Sanndabhaig, Na h-Eileanan Siar
External mastic across Sanndabhaig and nearby, with every bit of old sealant taken out first.
- Leaking joints around cladding and façade panels
- Hard, crazed mastic that has stopped moving
- Rigid filler in a joint that should flex
Signs you need external mastic in Sanndabhaig
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, and it tears off the sides.
Common reasons people contact us include:
- Movement joints with cracked, split or missing sealant
- Joints where the bead has come unstuck
- Weeds or debris growing in open joints
- Panel joints letting water in
Around Sanndabhaig, as everywhere, external mastic is only as good as the preparation behind it.
What your quote should include
- Whether VAT is included
- Who does the work, and how experienced they are
- When the joint can take water or movement
- The length of the guarantee
External mastic in Sanndabhaig
Failed sealant is cut out, the depth set with closed-cell backing rod, and the joint resealed with a low-modulus sealant made for outside. The colour is chosen to suit the brick or render so the line blends in. We are often asked to deal with gaps where render, brick and frames meet and weeds or debris growing in open joints, across joints between brick and frames, brickwork movement joints and façade panels.
In and around a place like Sanndabhaig, many buildings face open ground and take the full weather. Gutter joints and wall joints take a battering.
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.
- Where
- Sanndabhaig (HS2)
- Region
- Na h-Eileanan Siar
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Nearby places to Sanndabhaig
Also in Sanndabhaig
How the job changes by surface
Render joints
Cracks along render joints let water in behind the coat. Resealing the joints early keeps water out and helps it last.
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. Their movement joints are sealed over backing rod with a flexible sealant.
Walls and rooflines in Sanndabhaig
Sanndabhaig is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on movement joints and outside wall joints, especially on the side facing the sea. Work on the islands has to be planned around ferry crossings and the weather, so give us as much notice as you can.
Whether the job is in Sanndabhaig itself or nearby, the right material for each joint matters as much as a neat finish.
Sanndabhaig (Gaelic: Sandwick) is in Na h-Eileanan Siar. From the centre of Sanndabhaig to the outskirts, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Our area takes in 87 places across Na h-Eileanan Siar, from the larger towns to small villages.
All of HS2 is covered for external mastic. Streets in the area include Mackenzie Park, MacKenzie Lane and Mackenzie Avenue, all of which we cover. We also cover the places around Sanndabhaig: Sandwick (1 mile west), Plasterfield (1 mile north-west), Branahuie (1 mile east), Steinis (1 mile north) and Bràigh na h-Aoidhe (1 mile east). Sanndabhaig is among the bigger towns we cover in Na h-Eileanan Siar. For island and remote addresses, a little more planning is needed.
Landmarks near Sanndabhaig
A little further out are Western Isles Hospital (1.9 miles north-west) and Lewis Loom Centre (1.8 miles west). For a walk, there’s Loch Àirigh na Lic.
Work for landlords, hotels and businesses
Failed sealant is one of the commonest items on a check-out report. Several properties can go on one quote.
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will quote.
Keeping the joints in good condition
A little care helps the new joints last. Our advice:
- Never let anyone fill a movement joint with mortar
- Show decorators and builders where the movement joints are
- Have failed joints looked at early
- Avoid pressure-washing directly into sealant joints
Give the sealant the cure time we tell you before anything rubs against it. Most exterior sealants skin fast but take longer to cure right through.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.
What affects the cost of external mastic
The price is agreed before any work begins. It’s based on:
- Mould in or behind the old joints
- Any working-time requirements on site
- Access and height
- The product the joint needs
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs, plus any working-time requirements on site. Ask us for a quote and we’ll explain what it covers.
What we need to know
To make quoting easier, please include:
- If it’s domestic, commercial or a hotel
- Access, such as stairs, a lift or height
- A few photos by email, if you can
- Where the property is
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, drop us a line at info@mrmastic.co.uk.
Common questions in Sanndabhaig
Does living near the coast affect external mastic in Sanndabhaig?
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.
Is Sanndabhaig in your area for external mastic?
Yes. We work across all of Scotland, and Sanndabhaig is part of that. You can send an email to info@mrmastic.co.uk and let us know what needs doing.
Is it OK to seal over old sealant?
No. The old sealant always comes out first, so the new joint bonds to clean surfaces.
Do you take out the old sealant first?
Yes, every time. New sealant will not bond properly to old, so any old material comes out before anything new goes in.
Will you leave a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status.
Do you use backing rod?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. That way it bonds to the two sides only and can stretch.
How long will you be here?
It depends on the size of the job, but most jobs take anything from a few hours to several days, depending on the building. We’ll tell you when we quote.
What happens if it’s left?
It often makes sense to reseal all the failing joints on an elevation together. They’ve weathered the same way. Out of town in Scotland, exposed walls take a lot of weather, and damp in stone or harled walls takes a long time to dry once water gets behind a joint.
The cost depends on the size of the job, how much old material has to come out and how easy the joints are to reach. You’ll have a clear quote before any work starts.
Why book with us
- Colour picked to suit the job
- 4.9 on Google from 180+ five-star reviews
- Experience in homes, commercial sites and hotels
- Colour agreed with you before work begins
Read our cost guide or our reviews.
What happens on the day
Most of a good job is in the preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. In total, it normally takes anything from a few hours to several days, depending on the building. In smaller Scottish places, parking is normally less of an issue than access and distance. Tell us how to find the property and how to reach the work, and the visit is planned around that.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- We cut out the failed sealant and rake out any dirt or growth.
- Both sides are cleaned back to sound material and primed if needed.
- 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.
Getting ready for the visit
- Tell us about any water getting in
- Clear the area around the work
- Mention any tricky access
Ask for a quote
Want a quote for external mastic? Please drop us a line at info@mrmastic.co.uk with a few details. You will know what we plan to do, and what it will cost, before any work begins.