Na h-Eileanan Siar · Scotland
Portvoller External Mastic
Specialist external mastic for Portvoller: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Rain getting behind render or cladding at a joint
- Leaking joints around cladding and façade panels
- Old sealant gone brittle and cracked
External mastic for homes and businesses in Portvoller
A movement joint is only as good as its depth. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, so it bonds to the two sides only and can stretch. If you are dealing with joints where the bead has come unstuck and gaps where render, brick and frames meet, we can put it right, whatever the surface.
In and around a place like Portvoller, 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.
Big or small, you get the same one-year guarantee.
- Location
- Portvoller (HS2)
- Wider area
- Na h-Eileanan Siar
- Guarantee
- One year on every job
- Quotes
- A clear price before work begins
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Leave it or put it right?
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. In an older home around Portvoller, damp from a failed joint can get into timber and plaster.
What you pay reflects the work, not a rough estimate. That’s why we ask a few questions first and agree the price before starting.
What you get with us
- Colour picked to suit the job
- Arbo and Everbuild products
- Approved under the ARBOMaster scheme
- Every job guaranteed for a year
See our cost guide and customer reviews.
When something else is needed
Before booking, it’s worth knowing the limits too:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Render that’s 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.
Surfaces we seal
- Copings & trims
- Brickwork movement joints
- Concrete & block
- Render & cladding joints
- Joints between brick and frames
- Façade panels
Common questions in Portvoller
Can you do external mastic in Portvoller?
Yes. We work across all of Scotland, and Portvoller is part of that. You can drop us a line at info@mrmastic.co.uk and let us know what needs doing.
Is external mastic in a coastal place like Portvoller any different?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Do you have insurance?
Yes. We are fully insured.
What is backing rod for?
That is backing rod, a closed-cell foam. It stops the sealant going in too deep and bonding to three sides so it can flex with the joint.
Can I do it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
I’m a tenant. Can you help?
Of course. Check with your landlord; we can send the quote to them too.
Is the work guaranteed?
Yes, for a year. If there’s a problem with our work in that time, tell us and we will put it right.
When is the sealant fully cured?
Many sealants skin over quickly but take longer to cure fully. We will tell you how long to leave the joint before we leave.
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
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 Portvoller
Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. We have worked in hotels as well as homes 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 that we can handle for you.
How the visit works
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The job generally takes a few hours to a few days, depending on the length of joint and the access, including the tidy-up. Somewhere like Portvoller may be a longer drive, and the journey is planned ahead. Tell us about tracks, gates, a ferry crossing or anything unusual about getting there.
- We start by walking round the building and agreeing the joints and the access.
- 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.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
How to prepare
- Mention if the joints have been sealed before
- Clear items away from the joints we’re working on
- Tell us about any water getting in
How to get a quote
For external mastic in Portvoller, drop us a line at info@mrmastic.co.uk. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Advice
Different surfaces, different methods
Cladding and façade panels
Cladding and façade panels are generally separated by sealed joints. Each joint gets a sealant that suits the panel and its movement.
Brickwork movement joints
Brick movement joints are often mistaken for a missing mortar line. If that’s happened, we rake it out and reseal it properly where it can be done safely.
Nearby places to Portvoller
Other services in Portvoller
What external mastic looks like in Portvoller
Portvoller 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. That is hard on movement joints and outside wall joints, especially on the side facing the sea. Harled (roughcast) walls are common in Scotland, and where harling meets frames, pipes and other materials, the joint needs a flexible sealant that grips a rough surface.
If you look after a building such as Aird Primary School, larger buildings have long runs of movement joint that eventually need resealing. In and around Portvoller, as anywhere, good external mastic starts with a clean, dry, properly prepared joint.
Portvoller is about 9 miles east of Stornoway, in Na h-Eileanan Siar. We provide external mastic to householders, landlords and businesses in Portvoller, as part of our work across Na h-Eileanan Siar. Across Na h-Eileanan Siar, we cover 87 places, Portvoller among them.
We cover every part of HS2 for external mastic. Close by, we work in Port Mholair (1 mile north-east), Aird (1 mile south-west), Shulishader (2 miles south-west), Sulaisiadar (2 miles south-west) and Garrabost (3 miles south-west). If you’re somewhere remote, the job takes a little more planning.
Near you in Portvoller
The countryside around Portvoller includes Loch an Tiumpan.
What affects the cost of external mastic
You’ll get a clear quote before we start. It’s based on:
- The number and length of the joints
- The old material and how stubborn it is
- How many rooms, windows or areas are involved
- Access and height
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we’ll go through it with you.
What we need to know
To make quoting easier, let us know:
- Photos by email, if that’s easy
- The address or postcode of the job
- Access, such as stairs, a lift or height
- The type of property
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we will explain what’s involved before giving you a price.