Argyll and Bute · Scotland
Sand mastic for sash & case windows in Portnahaven, Argyll and Bute
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Portnahaven and across Argyll and Bute. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Gaps round a timber door in stone or brick
- Modern sealant on a period surround
- Draughts and rain around sash boxes
How we handle sand mastic in Portnahaven
Across Portnahaven, we renew sand mastic around sash and case windows. Every joint is cleaned out and filled by hand, finished to suit the masonry. Typical jobs include silicone on a period window that looks wrong and gaps between timber frames and stone or brick, on timber door frames, stone surrounds and brick reveals.
Across smaller places in Scotland, homes range from stone and harled cottages to newer houses, many standing in the open. Wind-driven rain finds any gap around a frame or sill.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Location
- Portnahaven (PA47)
- Region
- Argyll and Bute
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- info@mrmastic.co.uk
- Updated
- 26 October 2026
What we do, step by step
All our tools and materials come with us in the van. After a quick look at the joints together, the area is protected and the work begins. Most jobs take a few hours per window, depending on the condition of the joints. For a place like Portnahaven, longer drives are planned in advance. Tell us about tracks, gates, a ferry crossing or anything unusual about getting there.
- First, we look at the surrounds with you and agree what needs doing.
- We rake out the old mastic and clean the joint.
- We pack any deep gaps so the mastic sits at the right depth.
- 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
- On commercial sites, let us know about site rules
- Move anything stored near the joints
- Mention any tricky access
Ask for a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is.
Related advice
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. Our tips:
- Ask us before painting near the mastic
- Plan mastic work ahead of painting
- Keep sills and gutters clear so water drains away
- Look over the window mastic once a year
Keep paint scrapers and sanders off the mastic when redecorating. It can be damaged by heavy scraping.
An open joint round the box lets weather through. Left, the gap tends to get bigger as more mastic falls out.
Nearby places to Portnahaven
Other services in Portnahaven
Why it’s worth doing now in Portnahaven
If you are redecorating, renew the mastic first. Painting over failed mastic does not seal it, and the new mastic is traditionally left unpainted. When the nearest tradesperson is a drive away, it’s tempting to leave a small leak, but water behind a failed seal does the most damage when nobody’s watching.
We do not show prices on the website, because the cost depends so much on the job itself. For a quick quote, please email us at info@mrmastic.co.uk.
Why us?
- 180+ five-star Google reviews
- Full insurance on every job
- Anti-fungal silicone where joints get wet
- We never seal over old sealant
Read our cost guide or our reviews.
How the job changes by surface
Period and listed homes
Materials matter on listed and conservation-area homes. Like-for-like sand mastic is normally favoured.
Sash and case windows
On a sash window, the mastic joint shows on the outside, so a neat, even finish matters.
Common problems we fix in Portnahaven
Over the years, sand mastic weathers. It hardens, cracks and starts to come away on the stone or timber.
These are the problems we are asked about most:
- Mastic dropping out of the joint
- Modern sealant on a period surround
- Mastic worn away on windows facing the weather
- Window mastic to renew ahead of painting
In and around Portnahaven, as anywhere, good sand mastic starts with a clean, dry, properly prepared joint.
Questions to ask before booking
- Is VAT in the price?
- How hidden problems are handled
- How long to leave it before use
- Which sealant they’ll use, and why
Quotes for sand mastic in Portnahaven
For a quick quote, just ask. What matters most is:
- How many areas need sealing
- When we can work, for business premises
- The number and length of the joints
- Access and height
Doing several joints on one visit normally makes better use of the time than several visits. We will give you a clear price for the lot.
What we need to know
When you call or email, it’s useful to know:
- Where the job is, and your postcode
- The rough size of the job
- If someone has resealed it before
- Access, such as stairs, a lift or height
Every job is quoted individually, so start by telling us what you need. Simply email us at info@mrmastic.co.uk and describe the job and send pictures if you have them.
DIY sealant or a professional job?
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.
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.
Sand mastic in Portnahaven: local notes
Portnahaven is close to 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. 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.
Homes close to Portnahaven Church include some older properties, and the joint between an old wall and a newer frame is usually the first place rain gets in.
Portnahaven (Gaelic: Port na h-Abhainne) is in Argyll and Bute. Whether you’re in the middle of Portnahaven or further out, sand mastic is available for homes and businesses alike. We cover 118 towns and villages across Argyll and Bute.
Work in PA47 works the same way as everywhere else we cover. If you need sand mastic at a property on High Street, Shore Street and Church Street or anywhere close by, our applicators can take on the job. Neighbouring places we cover for sand mastic include Bun Othan (1 mile south), Port Charlotte (6 miles north-east), Bowmore (10 miles north-east), Imeraval (12 miles east) and Port Ellen (13 miles east). If you’re somewhere remote, the job takes a little more planning, so mention it when you ask for a quote.
Around Portnahaven
Green spaces nearby include Beinn Tart a' Mhill.
Your questions about sand mastic in Portnahaven
Do you cover Portnahaven for sand mastic?
Yes, Portnahaven is within the area we cover. We work across all of Scotland. Just send an email to info@mrmastic.co.uk with a few details of the job, and we will give you a clear price.
Do you cover smaller places like Portnahaven?
Yes, Portnahaven is covered. We work across all of Scotland, from towns to the smallest places. Longer journeys are simply planned in advance.
Will you leave a mess?
We keep the work tidy. We protect what’s around the joints, and we clear up when we’re done.
Can you replace silicone on a period window with sand mastic?
Normally, yes. With the silicone removed and the joint cleaned we point it with sand mastic.
Is it OK to seal over old sealant?
No, it won’t last. It can look neat for a few weeks, but the new layer lifts away from the old one. The old sealant has to come out completely.
What exactly is sand mastic?
Sand plus a binder based on linseed oil. It’s applied by hand and shaped to suit the surround.
How long does the job take?
Typically it takes a few hours for a single window, longer for several. Bigger jobs take longer.
Should I try DIY first?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.