Scottish Borders · Scotland
External Mastic in Killochyett
External mastic in Killochyett from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Water getting into walls through failed joints
- Sealant pulling away from one side of the joint
- Hard, crazed mastic that has stopped moving
How the job changes by surface
Render joints
The face of render can be soft, so a low-modulus sealant is kinder to the joint edges. Priming is done where the sealant calls for it.
Cladding and façade panels
Panels heat up and cool down quickly, so the joints work hard every day. We choose the product to suit.
About our external mastic in Killochyett
Many failed façade joints only get noticed once there’s a stain or a damp patch inside. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant in a colour to suit. We work on render & cladding joints, copings & trims and concrete & block, and common reasons people get in touch are sealant pulling away from one side of the joint and gaps where render, brick and frames meet.
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.
There’s a 12-month guarantee on every job.
- Where
- Killochyett (TD1)
- Region
- Scottish Borders
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
DIY sealant or a professional job?
If you’ve already had a go yourself, that’s fine. We cut it out and start again, so tell us about it when you ask for a quote.
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
When to call us in Killochyett
Poor preparation causes many early failures: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The new sealant then lets go long before it should.
Signs it’s time to call us include:
- Damp patches traced to an open external joint
- Brick movement joints where the sealant has split
- Leaking joints around cladding and façade panels
- Joints pointed up with cement by mistake
In and around Killochyett, as anywhere, good external mastic starts with a clean, dry, properly prepared joint.
What to look for in a quote
- How hidden problems are handled
- Which colour the sealant will be
- How the surfaces are prepared before sealing
- What the cure time is
Your questions about external mastic in Killochyett
Can you help a landlord with a rental near Stow station?
Yes, we work for letting agents and landlords. You can send an email to info@mrmastic.co.uk with the address and a few details, and we will give you a fixed price before work begins.
Is Killochyett in your area for external mastic?
Yes, Killochyett is within the area we cover. Our work covers the whole of Scotland. Just send an email to info@mrmastic.co.uk with a few details of the job, and we’ll give you a clear price.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status, and we’re fully insured.
How long will you be here?
It depends on the size of the job, but as a guide it takes a few hours to a few days, depending on the length of joint and the access. We’ll give you a better idea when we quote.
Is it OK to fill a movement joint with cement?
No. Rigid materials can’t move with the wall, so the joint stops doing its job. Where a joint has been mortared, it can often be raked out and sealed properly.
Do you take out the old sealant first?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
What is backing rod for?
Backing rod controls the sealant depth and keeps it off the back of the joint. That way it bonds to the two sides only and can stretch.
Can you match the colour of my brickwork?
The sealant colour is picked to suit the wall. Exterior sealants come in a good range of colours.
How the visit works
You don’t need to clear the whole room or building, only the area right around the joints. Everything nearby is protected, and the job takes a few hours to a few days, depending on the length of joint and the access in most cases. Outdoor work around Killochyett depends on the weather, as sealant needs a dry surface, so an outdoor job can move if the forecast changes. Work indoors is not affected.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Preparing for the visit
- Mention any parking rules near the property
- Let us know if you’ve seen damp or leaks
- On commercial sites, let us know about site rules
Get a quote
There’s no standard price list. Instead, we give you a clear quote for your job. To get started, email us at info@mrmastic.co.uk.
Advice
Also near Killochyett
What else we do in Killochyett
Walls and rooflines in Killochyett
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. Harled (roughcast) walls are common in Scotland, and joints where harling meets other materials need a sealant that can grip and flex.
Letting a property close to Stow station? Then split movement joints are easy to miss on a rental until damp shows inside.
Killochyett is about 6 miles north of Galashiels, in the Scottish Borders. Killochyett gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. 89 places in the Scottish Borders are on our list, large and small. For nearby work, see our Edinburgh page.
Here we cover the TD1 postcode area for external mastic. External mastic is available to properties on Cockholm Crescent, Craigend Road and Galashiels Road. We also cover the places around Killochyett: Stow (1 mile south-east), Fountainhall (3 miles north-west), Lauder (5 miles east), Clovenfords (5 miles south) and Nether Blainslie (6 miles east). We also work in nearby towns such as Galashiels (6 miles south), Peebles (13 miles west), Selkirk (10 miles south), Innerleithen (9 miles south-west), Melrose (9 miles south-east) and Earlston (8 miles south-east).
Local landmarks in Killochyett
There’s a railway station in Killochyett itself: Stow station.
When something else is needed
We won’t take on work that will not last, so here’s what sealant can’t put right:
- Adding movement joints to masonry that has none
- Render that is blown, hollow or coming away
- Subsidence or other structural problems
If in doubt, drop us a line at info@mrmastic.co.uk and we will say what we think before you book.
Where we work in Killochyett
- Brickwork movement joints
- Render & cladding joints
- Concrete & block
- Façade panels
- Copings & trims
- Joints between brick and frames
How we quote for external mastic
We do not publish a price list, because jobs vary so much. What we look at:
- How much old sealant there is and how hard it is to remove
- The number of rooms or windows
- How easy the joints are to reach
- The amount of work
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 we need extra access for height. We take all of that into account in your quote.
Asking for a quote
You do not need to know the technical terms. It helps if you can tell us:
- How we’d reach the joints
- How many joints, rooms or windows are involved
- Where the property is
- Photos by email, if that is easy
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.
For landlords and businesses
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we will quote.