Fife · Scotland
Sand mastic for sash & case windows in St Andrews, Fife
Window and door surrounds in St Andrews need attention? We cut out the old, prepare the joints and apply the right sealant.
- Crumbling sand mastic round a window
- Gaps between timber frames and stone or brick
- Mastic round period door frames that has failed
How we handle sand mastic in St Andrews
Sand mastic skins over fairly quickly, but it takes longer to harden fully. Traditionally, sand mastic is left unpainted and we’ll advise if you are redecorating. If you have old cement repairs round a window that have failed and silicone on a period window that looks wrong, we can help.
In and around a place like St Andrews, homes range from older stone-built cottages to newer houses. Wind-driven rain finds any gap around a frame or sill, so the mastic there works hard.
Big or small, you get the same 12-month guarantee.
- Where
- St Andrews (KY16)
- Wider area
- Fife
- Guarantee
- One year on every job
- Quote
- A clear price before work begins
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
How it works
There isn’t much for you to do on the day. Show us the job and we will take it from there. The job generally takes anything from a few hours to a full day, depending on how many windows. For a place like St Andrews, longer drives are planned in advance. Tell us about tracks, gates, a ferry crossing or anything unusual about getting there.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic isn’t too thick.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Before we arrive
- Mention any parking rules near the property
- Tell us about any water getting in
- Let us know about earlier repairs to the joints
Ask for a quote
For a quick quote, get us on the phone, or email us if that’s easier. Tell us about the joints that need doing and we’ll talk you through the work before giving you a price.
Advice
What the job involves on each surface
Period and listed homes
Period homes look their best with traditional materials.
Sash and case windows
The mastic round a sash window is on show, so a neat, even finish matters.
When to call us in St Andrews
Shallow joints are a common cause. Mastic that is too thin cracks and drops out so we make sure the new mastic is the right thickness.
Any of these means the joints need attention:
- Gaps where the frame meets the masonry
- Wind and rain getting in round a sash window
- Weathered mastic on the most exposed windows
- Modern sealant on a period surround
Rented homes near Leuchars station change hands often, and older sash windows in a rental need their mastic kept sound to keep the weather out.
What your quote should include
- When the joint can take water or movement
- What happens if the job turns out different
- What the quote includes, VAT included or not
- How the colour is chosen
Places near St Andrews
Also in St Andrews
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Why deal with it now?
An open joint round the frame lets weather in. Left, water can reach the timber and the wall, so dealing with it now protects both. In an older home around St Andrews, damp from a failed joint can get into timber and plaster, which is a far bigger job than the sealant.
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please email us at info@mrmastic.co.uk and we will talk you through it.
Why choose Mr Mastic in St Andrews
- We leave the area clean and tidy
- Fully insured
- Every job guaranteed for a year
- Experience in homes, commercial sites and hotels
Read what affects the cost and what customers say.
When something else is needed
We will always be straight with you, so here’s what sealant can’t fix:
- Cracked or broken glass
- Decisions on consent for listed homes
- Crumbling stone or brickwork round the window
Not sure which it is? You can send an email to info@mrmastic.co.uk and we will tell you honestly.
What we seal
- Sash and case windows
- Brick reveals
- Tenement windows
- Period & listed homes
- Timber door frames
- Stone surrounds
FAQs for St Andrews
Do you cover smaller places like St Andrews?
Yes, we do. We work across all of Scotland, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Does the coastal weather in St Andrews affect outside sealant?
Coastal homes put outside sealant through more weather than inland ones, so the choice of sealant and the preparation matter even more. Walls facing the sea are usually the first to need attention.
How do I get a quote for sand mastic in St Andrews?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. You’ll get a clear quote before work begins.
Can sand mastic be painted?
Sand mastic is normally left unpainted, as guidance on traditional windows advises. Ask us before decorating.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Is there any odour?
It depends on the product. Some products have a noticeable smell, others very little.
Should I use sand mastic or silicone?
Sand mastic generally suits period timber windows best. Modern frames normally suit a flexible sealant.
What do you need from me for a quote?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
How to look after the new joints
Looking after new joints is easy:
- Avoid heavy scraping on the mastic joint
- Leave the new mastic unpainted
- Do not run silicone over sand mastic
- Sort the mastic before the decorators arrive
Keep paint scrapers and sanders off the mastic when redecorating. It can be damaged by heavy scraping.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall, so renewing it early is worth it.
St Andrews homes and the weather
St Andrews is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on the mastic around older windows and doors, especially on the side facing the sea. 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.
Schools such as Madras College are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. In the older streets around St Andrews, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
St Andrews is about 12 miles south-east of Dundee, in Fife. Jobs in St Andrews get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Across Fife, we cover 133 places, St Andrews among them. You can also see our page for Dundee, roughly 12 miles from St Andrews.
Every address in KY16 is within our area for sand mastic. Streets in the area include Station Road, Church Square and Market Street. St Andrews sits on or near the A91 and A915, which makes travel easy. If you are just outside St Andrews, we cover Strathkinness (3 miles west), Boarhills (4 miles east), Guardbridge (4 miles north-west), Leuchars (4 miles north-west) and Lathones (5 miles south). Within a short drive, we also cover Leven (12 miles south-west), Cupar (8 miles west), Methil (13 miles south-west), Newport-on-Tay (9 miles north-west), Anstruther (9 miles south-east) and Tayport (8 miles north). St Andrews is one of the larger places we cover in Fife.
Landmarks near St Andrews
Locally, jobs take us to homes and businesses close to 97-99 South Street pub, Town Hall and Library and New Park School and the streets around them. For rail, the closest station is Leuchars station, about 4.5 miles north-west. Other landmarks nearby include St Andrews Castle (0.8 miles north-east) and St Andrews Museum (within half a mile north).