Scottish Borders · Scotland
External Mastic in Dolphinton
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Dolphinton and across the Scottish Borders. Fully insured, ARBOMaster approved and guaranteed for a year.
- Sealant pulling away from one side of the joint
- Hard, crazed mastic that has stopped moving
- Damp patches traced to an open external joint
How it works
Once we’re on site, we check the joints match what you told us. If anything is different, we explain it before carrying on. After that, the work takes anything from a few hours to several days, depending on the building. Outside jobs in Dolphinton 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.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- Try not to wet indoor joints just before the visit
- On commercial sites, let us know about site rules
- Let us know if you’ve seen damp or leaks
How to get a quote
To get a quote, email us at info@mrmastic.co.uk and tell us where the job is and what the problem looks like. We’ll give you a clear quote before any work starts.
Advice
External mastic for homes and businesses in Dolphinton
A movement joint is a deliberate break that lets a wall expand and contract. Its sealant has to flex with the building, season after season, so once it splits or hardens, the joint stops working and water gets in. We work on façade panels, joints between brick and frames and concrete & block, and the jobs we see most are plants rooting in failed movement joints and damp patches traced to an open external joint.
Outside joints can only be sealed when they’re dry, so work in Dolphinton depends on the weather, and longer journeys are planned in advance. Tell us how to reach each wall, gutter and roofline.
A one-year guarantee comes as standard, so you are not left on your own once the job is done.
- Where
- Dolphinton (EH46)
- Wider area
- Scottish Borders
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- info@mrmastic.co.uk
- Updated
- 26 October 2026
What we are called out for in Dolphinton
Sometimes a movement joint was filled with mortar or a rigid filler. With the joint locked solid, the movement turns into cracks elsewhere in the wall.
These are the problems we are asked about most:
- Movement joints filled with mortar instead of sealant
- Movement joints with cracked, split or missing sealant
- Leaking joints around cladding and façade panels
- Joints where the bead has come unstuck
Around Dolphinton, as everywhere, external mastic is only as good as the preparation behind it.
What to look for in a quote
- How long to leave it before use
- What product goes in the joint
- Are they insured?
- How the surfaces are prepared before sealing
Nearby places to Dolphinton
What else we do in Dolphinton
What affects the cost of external mastic
The price is agreed before any work begins. It’s based on:
- The number and length of the joints
- When we can work, for business premises
- The number of rooms or windows
- Whether the work is at height
A few things move the cost up or down: 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.
What to tell us for a quote
When you contact us, these details help:
- Roughly how big the job is
- The problem you’ve noticed
- The type of property
- The address or postcode of the job
Call for a quick quote, or email us if that is easier. Describe what needs sealing and we will talk you through the work before giving you a price.
DIY versus a professional finish
If you’ve already had a go yourself, that is fine. We cut it out and start again, so just mention it when you contact us.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Landlords, agents and businesses in Dolphinton
We also work for property managers and facilities teams in Dolphinton and across the Scottish Borders. Several sites can go on one quote, and we’re fully insured for the work.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
Walls and rooflines in Dolphinton
Plenty of Scottish homes have harled walls, and joints where harling meets other materials need a sealant that can grip and flex. Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and sound outside sealant is part of that.
If you live in an older home near Dolphinton Parish Church And Churchyard, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Dolphinton is about 12 miles south-west of Penicuik, in the Scottish Borders. We provide external mastic to homes and businesses in Dolphinton, as part of our work across the Scottish Borders. 89 places in the Scottish Borders are on our list. You can also see our page for Edinburgh, roughly 19 miles from Dolphinton.
Here we cover the EH46 postcode area for external mastic. If you need external mastic at a property on Peggies Knowe, Carmaben Brae and Hillside Gardens or a nearby road, our applicators can take on the job. If you’re just outside Dolphinton, we cover Kirkurd (2 miles south-east), Blyth Bridge (2 miles south-east), Walston (3 miles west), Elsrickle (3 miles south-west) and Candy Mill (4 miles south-west).
Local landmarks in Dolphinton
Well-known places in the area include Castle Craig Hospital (2.8 miles south-east) and Edmonston Castle (3.5 miles south-west). Not far away are White Hill and Slipperfield Loch.
FAQs for Dolphinton
Do you cover smaller places like Dolphinton?
Yes. Dolphinton is within the area we cover, which takes in towns, villages and rural addresses. Our work covers the whole of Scotland. Let us know about access, parking and anything unusual about getting there when you book.
What guarantee comes with external mastic in Dolphinton?
Every job comes with our one-year guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
How long does external mastic take?
It depends on the size of the job, but as a guide it takes a few hours for a handful of joints, longer for a whole elevation. We will give you a better idea when we quote.
Do you hold any approvals?
Yes. We’re approved under the ARBOMaster scheme, the approved applicator scheme for Arbo sealants.
What sealant do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Are you insured?
Yes. We’re fully insured for domestic and commercial work.
Do I need to be at home?
It depends on the job. For work indoors, someone needs to let us in, while outside work can sometimes be arranged differently.
When will the joints need doing again?
That varies with the weather the wall faces, how much it moves and the sealant used. Treat it as a maintenance item and look at it yearly and renew it when it starts to fail.
When it isn’t the sealant
New sealant can’t fix everything, and we’d rather say so up front. Sealant will not put right:
- Rising or penetrating damp from elsewhere in the wall
- Movement that’s more than a sealant joint can take
- Walls that need new movement joints cut into them
If in doubt, send an email to info@mrmastic.co.uk and we will say what we think before booking.
What we seal
- Copings & trims
- Brickwork movement joints
- Façade panels
- Render & cladding joints
- Joints between brick and frames
- Concrete & block
Why act early in Dolphinton
Done well, a resealed joint is a neat, straight line that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner, so it pays to do it properly once. Around Dolphinton, water from a failed joint in an older stone home can soak into timber and plaster, which is a far bigger job than the sealant.
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all play a part, and we will explain the quote if you ask.
Why us?
- Sealant colour chosen to suit
- Over 20 years’ experience
- Trusted Arbo and Everbuild sealants
- Colour agreed with you before we start