Argyll and Bute · Scotland
External Mastic in Black Crofts
External mastic in Black Crofts from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Joints with sealant missing in places
- Moss and dirt in joints with no sealant left
- Rain getting behind render or cladding at a joint
External mastic in Black Crofts, done properly
Getting the depth right is half the job. 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. We work on render & cladding joints, copings & trims and concrete & block, and common reasons people get in touch are joints pointed up with cement by mistake and sealant pulling away from one side of the joint.
Outside joints can only be sealed when they’re dry, so work in Black Crofts depends on the weather, and longer journeys are planned in advance. Tell us how to reach each wall, gutter and roofline.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we will sort it.
- Place
- Black Crofts (PA37)
- Wider area
- Argyll and Bute
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Common questions in Black Crofts
Do you work for landlords with property near Connel Ferry station?
Yes, rental work is part of what we do. You can email us at info@mrmastic.co.uk with the address and a few details, and we’ll give you a fixed price before any work starts.
Is external mastic in a coastal place like Black Crofts 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 seal joints where cladding meets other materials?
Yes. Joints between dissimilar materials are a big part of external work. The sealant is chosen to bond to both sides.
Do you cover Black Crofts?
Yes. We are based in Crawley and work across South East England, London and Scotland, Black Crofts included.
Will there be a smell?
That depends on the sealant. Some smell for a while, some hardly at all, and any smell fades as they cure.
Can you reach joints on upper floors?
It depends on the height and the site. Low-level joints are straightforward; for higher work, tell us about the building and we’ll confirm what’s needed.
What’s an expansion joint in brickwork?
Brickwork, render and cladding all move a little, so long walls have planned gaps to take that movement. It’s closed with backing rod and a flexible sealant.
When is the sealant fully cured?
Many sealants skin over quickly but take longer to cure fully. We will give you the cure time for the product we used.
What we cannot put right
To be straight with you, some problems need a different trade:
- Walls that need new movement joints cut into them
- Render that’s blown, hollow or coming away
- Movement that is more than a sealant joint can take
If in doubt, email us at info@mrmastic.co.uk and we will say what we think before you book.
What we seal
- Joints between brick and frames
- Concrete & block
- Copings & trims
- Render & cladding joints
- Façade panels
- Brickwork movement joints
For landlords and businesses
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.
What the job involves on each surface
Render joints
Render is weaker at the surface than brick, so a low-modulus sealant is kinder to the joint edges. Priming is done where the sealant calls for it.
Copings and trims
Copings expand and contract through the day, so the joints need a sealant that stays flexible year round.
Looking after it afterwards
Aftercare is simple:
- Do not let climbing plants root in the sealant
- Have failed joints looked at early
- Check external joints each spring
- Keep water from gutters off the wall
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They must stay as flexible joints, never rendered or pointed over.
Once a joint can’t move, the wall finds another way, often as cracks near the joint. Resealing it early helps prevent that.
What happens on the day
You don’t need to clear the whole room or building, just the space around the work. We protect the rest, and the job takes a few hours to a few days, depending on the length of joint and the access for a typical job. Around Black Crofts, distance and access matter more than parking. Let us know how to find you and how to reach the joints, and the visit is planned around that.
- 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.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Before we arrive
- Let us know about parking restrictions
- Try not to wet indoor joints just before the visit
- For business premises, tell us about site rules or sign-in
How to get a quote
Call for a quick quote, or email us if that’s easier. Tell us about the joints that need doing and we’ll explain what’s involved.
Related advice
When to call us in Black Crofts
Buildings move more than people expect. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. The sealant in the movement joints takes that strain.
Most people get in touch after spotting something like this:
- Panel joints letting water in
- Moss and dirt in joints with no sealant left
- Sealant that has lost its bond to the brick or render
- Joints with sealant missing in places
For landlords with property near Connel Ferry station, outside joints that have cracked can let damp into a rental, so check them between lets.
What to look for in a quote
- Whether they’re fully insured
- How the surfaces are prepared before sealing
- What the quote includes, VAT included or not
- What the cure time is
Walls and rooflines in Black Crofts
Black Crofts is within about 1 mile of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. Black Crofts is in the west of Scotland, which is wetter than the east, which means movement joints and outside wall joints has to cope with a lot of rain.
If you live in an older home near Ardchattan Parish Church, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Black Crofts is about 40 miles north-west of Helensburgh, in Argyll and Bute. Black Crofts gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Black Crofts is one of 118 towns and villages in Argyll and Bute we cover. You can also see our page for Glasgow, roughly 60 miles from Black Crofts.
Every address in PA37 is within our area for external mastic. Other places close to Black Crofts include Ardchattan (1 mile north-east), North Connel (1 mile south-west), Connel (2 miles south-west), Benderloch (2 miles north-west) and Dunbeg (4 miles south-west). Remote and island addresses need a little more planning, so please mention your location when you email us at info@mrmastic.co.uk.
Around Black Crofts
The nearest railway station is Connel Ferry station, roughly 1.4 miles south-west of the centre. Well-known places in the area include Dunstaffnage Castle (3 miles west). Green spaces nearby include Lochan Dubh.
What happens if it’s left?
Resealing a run of joints in one go is usually better than patching one at a time. They’ve weathered the same way. In an older home around Black Crofts, damp from a failed joint can get 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 make a difference.
Why us?
- Approved under the ARBOMaster scheme
- Sanitary silicone with an anti-fungal additive in wet areas
- White, clear, grey or coloured to suit, where the product allows
- Experience in homes, commercial sites and hotels
Read what affects the cost or customer reviews.