Perth and Kinross · Scotland
Dunning External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Dunning and across Perth and Kinross. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Plants rooting in failed movement joints
- Old sealant gone brittle and cracked
- Damp patches traced to an open external joint
External mastic for homes and businesses in Dunning
Low-level joints can generally be done from the ground. For joints higher up, give us some details of the building and we’ll confirm what access is needed. Typical jobs include weeds or debris growing in open joints and water getting into walls through failed joints, on façade panels, copings & trims and render & cladding joints.
In and around a place like Dunning, many buildings face open ground and take the full weather. Gutter joints and wall joints take a battering, so they need a sealant that moves with the building.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we’ll put it right.
- Location
- Dunning (PH2)
- Wider area
- Perth and Kinross
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Questions from Dunning
Do you cover smaller places like Dunning?
Yes, we do. We work across all of Scotland, and smaller places are part of that. Longer journeys are simply planned in advance.
What guarantee comes with external mastic in Dunning?
All our work, in Dunning and everywhere else, comes with a 12-month guarantee. We’re fully insured, and an ARBOMaster approved applicator.
Can landlords and businesses book you?
Yes, we do. We work in homes, commercial premises and hotels, and we’re fully insured.
How long does external mastic take?
That depends on how much there is to do, but most jobs take a few hours to a few days, depending on the length of joint and the access. We’ll tell you when we quote.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator and we’re fully insured too.
Do I have to be there?
That depends on where the joints are. For work indoors, someone needs to let us in.
How long before the joint can be used?
Cure times vary by product and the conditions. Before we leave, we will 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. We use products from Arbo and Everbuild.
Signs you need external mastic in Dunning
UV, rain and frost all age exterior sealant. Over the years it hardens, cracks on the surface and loses its give, so the next time the wall moves, it splits or pulls away.
Signs it’s time to call us include:
- Joints with sealant missing in places
- Cracked joints where brick meets render or frames
- Rain getting behind render or cladding at a joint
- Joints where the bead has come unstuck
If you live in an older home near St Serf's Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
What to look for in a quote
- Whether you can choose the colour
- Is VAT in the price?
- Is the old sealant removed completely?
- What preparation is included
Keeping the joints in good condition
Aftercare is simple, and it makes a real difference:
- Check the sealant is paintable before painting near it
- Look over the joints every year, ideally after winter
- Tell anyone working on the walls about the movement joints
- 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 we cannot put right
Before you book, it’s worth knowing the limits:
- Movement that is more than a sealant joint can take
- Rising or penetrating damp from elsewhere in the wall
- Render that’s blown, hollow or coming away
If in doubt, email us at info@mrmastic.co.uk and we will say what we think before you book.
Where we work in Dunning
- Copings & trims
- Brickwork movement joints
- Joints between brick and frames
- Render & cladding joints
- Façade panels
- Concrete & block
DIY versus a professional finish
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
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.
Dunning buildings and the weather
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. Plenty of Scottish homes have harled walls, and joints where harling meets other materials need a sealant that can grip and flex.
Around Dunning, as everywhere, external mastic is only as good as the preparation behind it.
Dunning is about 8 miles south-west of Perth, in Perth and Kinross. Anywhere in PH2, our applicators can take on external mastic. Our Perth and Kinross coverage runs to 107 places, and Dunning is one of them. You can also see our page for Dundee, roughly 26 miles from Dunning.
Here we cover the PH2 postcode area for external mastic. Streets in the area include Kirkstyle Square, Thorntree Square and Station Road, and we cover them all. Neighbouring places we cover for external mastic include Aberuthven (3 miles west), Auchterarder (5 miles west), Forgandenny (5 miles north-east), Milltown of Aberdalgie (5 miles north-east) and Balgowan (5 miles north). We also work in nearby towns such as Perth (8 miles north-east), Crieff (11 miles north-west), Kinross (9 miles south-east), Letham (7 miles north-east), Scone (10 miles north-east) and Tulloch (8 miles north-east).
Around Dunning
Other landmarks nearby include St Margaret's Hospital (5.3 miles west) and Keltie Castle (1.1 miles south-west). Not far away are Dupplin Lake and Innerdouny Hill.
Different surfaces, different methods
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.
Cladding and façade panels
If the façade has a specified sealant, that’s what we use. Tell us what the building has when you get in touch.
Towns and villages near Dunning
Also in Dunning
How the visit works
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. Typically it takes a few hours to a few days, depending on the length of joint and the access, and the area is left clean. Outside jobs in Dunning 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. Work indoors is not affected.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
How to prepare
- Tell us if parking is tricky
- Tell us about any water getting in
- For indoor joints, keep the area dry beforehand if you can
Getting a quote
Want a quote for external mastic? Please send an email to info@mrmastic.co.uk and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Read more
Quotes for external mastic in Dunning
Every job gets its own quote. This is what makes a difference:
- The number of rooms or windows
- The number and length of the joints
- Any mould that needs treating
- Access and height
What you pay reflects the work, not guesswork. That’s why we ask a few questions first and give you a clear quote before we start.
Asking for a quote
Before you ask for a quote, have a think about:
- Access, such as stairs, a lift or height
- Whether it has been sealed before
- What’s wrong with the joints now
- Photos by email, if that’s easy
For external mastic in Dunning, email us at info@mrmastic.co.uk. Tell us what the problem is and where, and you’ll get a clear quote before we start.