Na h-Eileanan Siar · Scotland
External & façade joints in Upper Coll, Na h-Eileanan Siar
Sealing brickwork movement joints, render, cladding and façade joints for homeowners, landlords and businesses in Upper Coll. Fully insured, ARBOMaster approved and guaranteed for a year.
- Hard, crazed mastic that has stopped moving
- Panel joints letting water in
- Plants rooting in failed movement joints
Leave it or put it right?
It often makes sense to reseal all the failing joints on an elevation together. They’ve weathered the same way and it means sorting access once. 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.
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Why Upper Coll clients choose us
- Quality sealants from Arbo and Everbuild
- Neat joints and a tidy finish
- We agree the colour with you first
- Anti-fungal sanitary silicone in wet areas
Take a look at how sealant jobs are priced and what customers say.
External mastic in Upper Coll, done properly
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, so once it splits or hardens, the joint stops working and water gets in. We work on copings & trims, brickwork movement joints and façade panels, and people most often call us about failed seals between different materials and hard, crazed mastic that has stopped moving.
In and around a place like Upper Coll, many buildings face open ground and take the full weather. Outside joints on exposed walls work hard, so they need a sealant that moves with the building.
All of our work is guaranteed for twelve months, in Upper Coll and everywhere else we cover.
- Place
- Upper Coll (HS2)
- Region
- Na h-Eileanan Siar
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
How to look after the new joints
Good habits help new joints last longer. Our tips:
- Deal with leaking gutters that soak the joints below
- Get split or bare joints resealed while the damage is small
- Ask before painting over external sealant
- Tell anyone working on the walls about the movement joints
Follow the cure time we give you before the joint is knocked or disturbed. The surface skins over quickly, but full cure takes longer.
Leaks behind façade panels and render often go unseen. By the time there’s a damp patch, the damage can be well established, so it’s worth resealing at the first signs.
More services for Upper Coll
What we do, step by step
Once we’re on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. Most jobs then take anything from a few hours to several days, depending on the building. Outside jobs in Upper Coll need a dry day, because sealant will not bond to a wet joint, so external jobs may need to move if the day turns wet. Work indoors is not affected.
- 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.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
How to prepare
- Mention any parking rules near the property
- Where the joints are inside, avoid wetting them before we arrive
- Keep children and pets away from the work area
How to get a quote
If you are in Upper Coll and need external mastic, email us at info@mrmastic.co.uk. Tell us what the problem is and where, and we will agree the price before any work begins.
Advice
Walls and rooflines in Upper Coll
Upper Coll 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. Private landlords in Scotland must meet the Repairing Standard, which includes keeping a home wind and watertight, and failed outside joints work against that.
For jobs in and around Upper Coll, choosing the right material for each joint is as important as a tidy finish.
Upper Coll (Gaelic: Col Uarach) is in Na h-Eileanan Siar. Whether you’re in the middle of Upper Coll or further out, external mastic is available for homes and businesses alike, from flats and houses to offices and hotels. 87 places in Na h-Eileanan Siar are on our list, from the larger towns to small villages.
Jobs for external mastic in HS2 is quoted and booked the same way as anywhere else. Nearby, we also carry out external mastic in Aird Tong (1 mile south), Tong (1 mile south-west), Bac (2 miles north-east), Newmarket (3 miles south-west) and Steinis (3 miles south). If you’re somewhere remote, the job takes a little more planning, so mention it when you ask for a quote.
Landmarks near Upper Coll
Other landmarks nearby include Lewis Loom Centre (3.6 miles south-west) and Western Isles Hospital (3 miles south-west). The countryside around Upper Coll includes Loch Àirigh na Lic.
Work for landlords, hotels and businesses
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will quote.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Common problems we fix in Upper Coll
Weeds, moss and debris in a joint are a sign the sealant has gone. Dirt and roots then trap moisture in the joint and speed up the damage.
The problems people usually mention when they call are:
- Joints pointed up with cement by mistake
- Brick movement joints where the sealant has split
- Failed sealant between panels on a façade
- Weathered mastic that no longer stretches
Around Upper Coll, as everywhere, external mastic is only as good as the preparation behind it.
Questions to ask before you book
- The length of the guarantee
- Who turns up on the day
- Are they insured?
- Whether the sealant suits the joint
Honest limits
Before you book, it’s worth knowing the limits too:
- Structural movement, which needs a surveyor or engineer
- Cracking across the wall rather than at a joint
- Loose or hollow render, which needs re-rendering
If you are not sure, just send an email to info@mrmastic.co.uk and we’ll give you a straight answer.
Joints and surfaces we work on
- Concrete & block
- Render & cladding joints
- Joints between brick and frames
- Façade panels
- Copings & trims
- Brickwork movement joints
Questions from Upper Coll
Does the coastal weather in Upper Coll affect outside sealant?
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.
Do you cover Upper Coll for external mastic?
Yes, Upper Coll is within the area we cover. We work across all of Scotland. You can drop us a line at info@mrmastic.co.uk and tell us what needs doing, and we’ll send you a clear quote.
How do I get a quote for external mastic in Upper Coll?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote and we will talk you through it.
Is there a guarantee?
Yes. Every job comes with a one-year guarantee.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Are you ARBOMaster approved?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
Where are you based?
We are based in Crawley, and we work across South East England, London and Scotland.
Why is there a gap in my brick wall?
A vertical gap in a long brick wall is normally a movement joint. It gives the wall room to move and needs a flexible seal, not mortar.