Na h-Eileanan Siar · Scotland
External Mastic in Geirinis
Problem with your movement joints in Geirinis? We cut out the old, prepare the joints and apply the right sealant, with a 12-month guarantee.
- Weeds or debris growing in open joints
- Sealant that has lost its bond to the brick or render
- Joints pointed up with cement by mistake
Looking after it afterwards
Aftercare is simple, and it makes a real difference:
- Look over the joints every year, ideally after winter
- Avoid pressure-washing directly into sealant joints
- Have failed joints looked at early
- Deal with leaking gutters that soak the joints below
Follow the cure time we give you before the joint is knocked or disturbed. The surface skins over quickly, but full cure takes longer.
If you can see gaps, plants or bare sections in a joint, have it checked. Earlier resealing means a smaller job and a better result.
External mastic for homes and businesses in Geirinis
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. If you have movement joints filled with mortar instead of sealant and rain getting behind render or cladding at a joint, we can help.
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.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Place
- Geirinis (HS8)
- Region
- Na h-Eileanan Siar
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- info@mrmastic.co.uk
- Updated
- 26 October 2026
How the job changes by surface
Cladding and façade panels
Panel systems often rely on sealant between and around the panels. We reseal them with a sealant suited to the panel material.
Joints between dissimilar materials
Wherever two materials meet, they move differently. A flexible sealant bridges the two so neither cracks the other.
Walls and rooflines in Geirinis
Geirinis 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. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. The west of Scotland is wetter than the east, so there’s plenty of rain for movement joints and outside wall joints to keep out.
Whether the job is in Geirinis itself or nearby, the right material for each joint matters as much as a neat finish.
Geirinis (Gaelic: Gerinish) is in Na h-Eileanan Siar. For external mastic in and around Geirinis, please send an email to info@mrmastic.co.uk for a quick quote. We cover Na h-Eileanan Siar from our Crawley base, Geirinis included. Geirinis is one of 87 places in Na h-Eileanan Siar we cover.
All of HS8 is within our area for external mastic, from the main roads to the quietest streets. Local streets include Cille Bha'nain and Dun Mor, and we cover them all. We also cover Creag Ghoraidh (4 miles north), Grimsay (5 miles north-east), Balivanich (8 miles north), Baile a' Mhanaich (8 miles north) and Dalabrog (13 miles south). If you are somewhere remote, a little more planning is needed, so let us know when you get in touch.
Around Geirinis
Not far away are Loch Bee and Ben Tarbert.
Questions from Geirinis
Do you cover smaller places like Geirinis?
Yes, we do. We work across all of Scotland, islands included, from towns to the smallest places. Longer journeys are simply planned in advance.
Is Geirinis in your area for external mastic?
Yes, Geirinis is within the area we cover. Our work covers the whole of Scotland. You can send an email to info@mrmastic.co.uk and let us know what needs doing, and we’ll give you a clear price.
Is it OK to seal over old sealant?
No. Fresh sealant does not stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Do you work at height?
That depends on how high the joints are and the ground below. Ground-floor joints are simple; for higher ones, send details and we will confirm the access.
Do you work for hotels and businesses?
Yes. We’ve worked for hotels, offices and other businesses.
Do the sealants smell?
Possibly a little. Any smell clears as the sealant cures.
How long does external mastic take?
Typically it takes a few hours for a handful of joints, longer for a whole elevation. Bigger jobs take longer, and we will tell you how long to expect.
Can you match the colour of my brickwork?
We aim for a joint that suits the wall rather than one that jumps out. We’ll talk through colour options before we start from the range available.
How it works
The work is kept neat and contained to the joints we are treating, so you can carry on as normal. The job normally takes a few hours to a few days, depending on the length of joint and the access. Outside jobs in Geirinis need a dry day, because sealant won’t bond to a wet joint, so external jobs may need to move if the day turns wet. Indoor work goes ahead whatever the weather.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- The old mastic and anything lodged in the joint is removed.
- 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.
Preparing for the visit
- Let us know about stairs, lifts or work at height
- Try not to wet indoor joints just before the visit
- Keep children and pets away from the work area
Getting a quote
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we’ll explain what’s involved.
Related advice
Do you need external mastic in Geirinis?
Every building moves. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. All of that ends up in the joint sealant.
The most common problems we see are:
- Plants rooting in failed movement joints
- Old sealant gone brittle and cracked
- Water getting into walls through failed joints
- Joints with sealant missing in places
Around Geirinis, as everywhere, external mastic is only as good as the preparation behind it.
What your quote should include
- What happens if the job turns out different
- How long the guarantee is
- Whether you can choose the colour
- Who turns up on the day
What affects the cost of external mastic
Every job gets its own quote. These are the things that affect it:
- The old material and how stubborn it is
- Whether there’s mould to deal with
- How easy the joints are to reach
- How many rooms, windows or areas are involved
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
What to tell us for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- The rough size of the job
- Whether it has been sealed before
- A few photos by email, if you can
- What the problem is, such as mould, gaps, leaks or cracking
There’s no standard price list, because every job is different. Instead, your job gets its own clear quote. To arrange one, email us at info@mrmastic.co.uk.
Landlords, agents and businesses in Geirinis
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
We work for landlords and letting agents as well as householders. Resealing between tenancies is a simple way to keep a property in good order.
Places near Geirinis
What else we do in Geirinis
Should I try it myself first?
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
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.