Aberdeenshire · Scotland
External & façade joints in Cornhill, Aberdeenshire
External mastic for Cornhill, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Movement joints with cracked, split or missing sealant
- Sealant pulling away from one side of the joint
- Gaps where render, brick and frames meet
External mastic for homes and businesses in Cornhill
External mastic is a job where short cuts show quickly. Overfilled joints, missing backing rod and sealant laid over old sealant all tend to fail early. We take the old material out and do it properly. We work on brickwork movement joints, render & cladding joints and concrete & block, and common reasons people get in touch are plants rooting in failed movement joints and panel joints letting water in.
Stone walls need a stone-friendly sealant, as acetoxy products can attack some stone. Newer houses need their movement joints and roofline trims kept sound.
The work is covered for a year after we finish. If anything isn’t right with it, email us at info@mrmastic.co.uk.
- Where
- Cornhill (AB45)
- Wider area
- Aberdeenshire
- Cover
- A year, on every job
- Quotes
- A clear price before we start
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Outside joints around Cornhill
Plenty of Scottish homes have harled walls, and joints where harling meets other materials need a sealant that can grip and flex. Private landlords in Scotland must meet the Repairing Standard, which includes keeping a home wind and watertight, and sound outside sealant is part of that.
Around Cornhill, as everywhere, external mastic is only as good as the preparation behind it.
Cornhill is about 11 miles south-east of Buckie, in Aberdeenshire. We carry out external mastic for homes and businesses in Cornhill and the surrounding area, as part of our work across Aberdeenshire. Cornhill is one of 161 towns and villages in Aberdeenshire where we work. For nearby work, see our Aberdeen page, about 38 miles away.
Jobs for external mastic in AB45 is quoted and booked the same way as anywhere else. External mastic is available to properties on Mid Street, Duff Terrace and Silverhillock and the roads around them. If you are just outside Cornhill, we cover Fordyce (4 miles north-west), Aberchirder (4 miles south-east), Portsoy (5 miles north), Boyndie (5 miles north-east) and Sandend (5 miles north). Further out, we also cover Turriff (10 miles south-east), Huntly (12 miles south), Banff (7 miles north-east), Macduff (9 miles north-east), Gardenstown (14 miles east) and Whitehills (6 miles north-east). If you’re somewhere remote, the job takes a little more planning, so mention it when you ask for a quote.
Local landmarks in Cornhill
Well-known places in the area include Fordyce Joiner's Workshop (3.9 miles north-west) and Campbell Hospital (4.9 miles north). For a walk, there’s Knock Hill.
What we are called out for in Cornhill
Many joints fail because they were sealed too deep or with nothing behind them. If the sealant sticks to the back as well as the sides, it cannot stretch and tears as soon as the joint widens.
Most people get in touch after spotting one of these:
- Hard, crazed mastic that has stopped moving
- Rain getting behind render or cladding at a joint
- Sealant pulling away from one side of the joint
- Failed sealant between panels on a façade
In the older streets around Ordiquhill And Cornhill Parish Church, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
What to look for in a quote
- Who does the work, and how experienced they are
- How long to leave it before use
- Whether VAT is included
- What preparation is included
What we do, step by step
On the day, we start by going over the job with you, so you know exactly what we are doing. Surfaces next to the work are protected before work begins. Most jobs take a few hours to a few days, depending on the length of joint and the access. Outside jobs in Cornhill 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 inspect the joints and agree which need resealing and how they’ll be reached.
- The old mastic and anything lodged in the joint is removed.
- The joint faces are cleaned and primed where the sealant needs it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Preparing for the visit
- Mention any leaks or damp you’ve noticed
- Keep children and pets away from the work area
- Mention any parking rules near the property
Getting a quote
Asking for a quote is easy: let us know the job and the location. Photos by email help us understand the job.
Related advice
Looking after it afterwards
Looking after new joints is easy, and it makes a real difference:
- Ask before painting over external sealant
- Show decorators and builders where the movement joints are
- Keep soil, plants and ivy away from the joints
- Check external joints each spring
Follow the cure time we give you before the joint is knocked or disturbed. The surface skins over quickly, but full cure takes longer.
Small splits are the time to act. Then it’s a straightforward cut-out and reseal before water has had years to get in.
Surface by surface
Brickwork movement joints
Brick walls have vertical movement joints to absorb expansion. We reseal them with a low-modulus sealant over backing rod coloured to suit the wall.
Render joints
Rendered walls have joints at beads, openings and changes of material. They’re resealed in a sealant that suits the render.
What we cannot put right
Honest advice matters more to us than a booking, so here’s what new sealant will not do:
- Subsidence or other structural problems
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Cracking across the wall rather than at a joint
If in doubt, send an email to info@mrmastic.co.uk and we will say what we think before booking.
Joints and surfaces we work on
- Concrete & block
- Copings & trims
- Render & cladding joints
- Joints between brick and frames
- Brickwork movement joints
- Façade panels
For landlords and businesses
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
Cornhill: your questions answered
Is Cornhill in your area for external mastic?
Yes, Cornhill is within the area we cover. We work across all of Scotland. You can send an email to info@mrmastic.co.uk and let us know what needs doing.
Do you cover smaller places like Cornhill?
Yes, we do. Our work covers the whole of Scotland, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
How long does the job take?
A typical job takes anything from a few hours to several days, depending on the building, including the preparation. We will confirm how long when we quote.
How often do external joints need resealing?
That depends on the wall, the weather and the movement. Signs to watch for are cracking, hardening and gaps at the edges and have them redone then.
Is there any odour?
Possibly a little. Any smell clears as the sealant cures.
Is it OK to fill a movement joint with cement?
No. Mortar locks the joint solid, so the movement cracks the wall elsewhere. It needs a flexible sealant over backing rod.
When is the sealant fully cured?
Different products cure at different speeds, so follow the cure time we give you when we finish.
Do you remove the old sealant?
Yes. All of the old material is cut out and the joint cleaned before resealing.
Also near Cornhill
What else we do in Cornhill
How we quote for external mastic
There’s no set price list. The quote depends on:
- The product the joint needs
- How many areas need sealing
- The number and length of the joints
- Mould in or behind the old joints
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
What we need to know
What to tell us when you ask for a quote:
- The rough size of the job
- Any access issues, like height or stairs
- Where the job is, and your postcode
- What the problem is, such as mould, gaps, leaks or cracking
If you are in Cornhill and need external mastic, send an email to info@mrmastic.co.uk. Tell us what the problem is and where, and you will get a clear quote before any work starts.