Argyll and Bute · Scotland
Sand mastic for sash & case windows in Shandon, Argyll and Bute
Professional sand mastic in and around Shandon, with every bit of old sealant taken out first and a 12-month guarantee.
- Gaps round a timber door in stone or brick
- Gaps where the frame meets the masonry
- Wind and rain getting in round a sash window
How we handle sand mastic in Shandon
For a listed home or one in a conservation area, ask your local planning authority whether consent is needed for work to windows. Like-for-like sand mastic is often the preferred finish. Typical jobs include crumbling sand mastic round a window and window mastic to renew ahead of painting, on tenement windows, sash and case windows and stone surrounds.
In and around a place like Shandon, homes range from older stone-built cottages to newer houses. Wind-driven rain finds any gap around a frame or sill.
Each job carries a 12-month guarantee.
- Where
- Shandon (G84)
- Wider area
- Argyll and Bute
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
Leave it or put it right?
Replacing sash windows is a big decision for a period home and on a listed home, consent may be needed. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. In an older home around Shandon, damp from a failed joint can get into timber and plaster, which is a far bigger job than the sealant.
What it costs depends on the size of the job, how much old material has to come out and access to the work. You’ll have a clear quote before any work starts, so you know where you stand.
Why book with us
- Quality sealants from Arbo and Everbuild
- Anti-fungal sanitary silicone in wet areas
- 4.9 on Google from 180+ five-star reviews
- We are fully insured
Read what affects the cost or customer reviews.
Frames and glazing around Shandon
Shandon 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. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. The west of Scotland is wetter than the east, which means the mastic around older windows and doors has to cope with a lot of rain.
For an older house near a landmark such as Parish Church, the joint between an old wall and a newer frame is usually the first place rain gets in.
Shandon is about 3 miles north-west of Helensburgh, in Argyll and Bute. Homes, rented property, offices and hotels in Shandon can book us for sand mastic, old or new, large or small. The work is guaranteed for a year. Shandon is one of 118 towns and villages in Argyll and Bute where we work for sand mastic. You can also see our page for Glasgow, roughly 24 miles from Shandon.
Work in G84 is quoted and booked the same way as anywhere else. That includes homes and businesses on Station Road, Gareloch Brae and Kings Point. Nearby, we also carry out sand mastic in Clynder (1 mile south-west), Rhu (1 mile south-east), Rahane (2 miles north-west), Rosneath (2 miles south) and Mambeg (3 miles north-west). We also work in nearby towns such as Helensburgh (3 miles south-east), Dunoon (8 miles south-west), Garelochhead (4 miles north), Sandbank (7 miles south-west) and Innellan (12 miles south-west).
Near you in Shandon
For rail, the closest station is Helensburgh Upper station, about 3 miles south-east. Well-known places in the area include Scottish Submarine Centre (3.2 miles south-east) and Victoria Infirmary (3.9 miles south-east).
Aftercare tips
Good habits help new joints last longer. A few tips:
- Plan mastic work ahead of painting
- Avoid heavy scraping on the mastic joint
- Don’t paint over the new mastic
- Get any rot dealt with first
Avoid painting over the new mastic, which is the traditional advice. Ask us before any decorating around it.
Fine cracks show the mastic is starting to fail. It’s easier to renew it before it drops out.
What we’re called out for in Shandon
Paint, silicone or cement used over old mastic causes problems. They do not suit the joint and we normally remove them.
The problems people normally mention when they call include:
- Wind and rain getting in round a sash window
- Gaps round a timber door in stone or brick
- Old cement repairs round a window that have failed
- Modern sealant on a period surround
If you let a flat or house near Helensburgh Upper station, any sash windows need sound mastic to keep draughts and rain out.
Before booking anyone
- Whether all the old sealant comes out first
- How long the guarantee is
- Who turns up on the day
- Whether the sealant suits the joint
Should I try it myself first?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions.
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
Other services in Shandon
What affects the cost of sand mastic
The price is agreed before any work begins. It takes into account:
- When we can work, for business premises
- The number of rooms or windows
- Whether the work is at height
- Whether old sealant or filler has to be cut out
Combining jobs into one visit is normally more efficient than separate visits. We will give you a clear price for the lot.
What we need to know
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- Pictures of the joints, sent by email
- If someone has resealed it before
- The problem you’ve noticed
- Any access issues, like height or stairs
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. Whenever you are ready, send an email to info@mrmastic.co.uk.
Different surfaces, different methods
Stone surrounds
The stone is treated with care while raking out the old mastic.
Tenement and terrace windows
Windows above ground floor need the right access. Let us know the floor and we will confirm access.
How it works
The work is kept neat and contained to the area we are working on. Expect the work to take a few hours per window, depending on the condition of the joints, and we explain the cure time before we leave. Around Shandon, distance and access matter more than parking. Let us know how to find you and how to reach the joints.
- We start by checking each surround and agreeing the joints to renew.
- Old, loose mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic isn’t too thick.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The finish is dressed so it sits neatly against the stone or brick.
Before we arrive
- Tell us about any previous sealing or DIY attempts
- Plan for the work area to be out of bounds to pets and children
- Tell us about access, such as stairs, a lift or high-level joints
Ask for a quote
If you’re in Shandon and need sand mastic, email us at info@mrmastic.co.uk. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Advice
Your questions about sand mastic in Shandon
Can you help a landlord with a rental near Helensburgh Upper station?
Yes. We work for landlords and letting agents as well as householders, and several properties can be quoted together. You can send an email to info@mrmastic.co.uk with the details for a clear quote.
Does living near the coast affect sand mastic in Shandon?
Near the sea, outside joints face more wind, rain and salt than they would inland, so preparation and the right sealant matter all the more. Walls facing the sea are usually the first to need attention.
How long does the job take?
Most jobs take a few hours for a single window, longer for several. We’ll confirm how long when we quote.
How do I get a quote for sand mastic in Shandon?
Size, access and the old material all affect the cost. Ask us for a quote and we will talk you through it.
Should I check with the council before work on a listed or conservation-area home?
Checking first is sensible. Ask your local planning authority whether consent is needed for listed or conservation-area properties.
What sealant do you use?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We explain the product when we quote.
Do you take out the old sealant first?
Yes, every time. New sealant will not bond properly to old, so the joint is cleaned back first.
Do you come to Shandon?
Yes. We work in Shandon and the rest of Argyll and Bute, as part of our work across South East England, London and Scotland. For a quote, email us at info@mrmastic.co.uk.