Aberdeenshire · Scotland
Johnshaven Window Mastic
Specialist window mastic for Johnshaven: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Untidy mastic left by window fitters
- Gaps between the frame and the inside reveal
- Draughts coming in around windows and doors
Window mastic for homes and businesses in Johnshaven
There are two joints on most windows. Outside, the mastic keeps rain out; the internal joint closes the gap to the plaster and stops draughts. Either or both can be done. Typical jobs include mastic that has split away from the wall and leaking joints at the ends of sills, on window sills, composite doors and uPVC windows.
In and around a place like Johnshaven, homes range from older stone-built cottages to newer houses. Exposed frames and sills take the full force of wind-driven rain.
Our work is backed for twelve months, in Johnshaven and everywhere else we cover.
- Where
- Johnshaven (DD10)
- Region
- Aberdeenshire
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
When it is not the sealant
We will always be straight with you, so here’s what sealant can’t fix:
- Worn gaskets, brush seals or a door that has dropped
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Damp coming through the wall itself rather than the frame joint
If you are not sure, just drop us a line at info@mrmastic.co.uk and we will give you a straight answer before you book.
Surfaces we seal
- Patio & French doors
- Window sills
- Aluminium frames
- Timber windows & doors
- uPVC windows
- Composite doors
Johnshaven homes and the weather
Johnshaven is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on the mastic around window and door frames, 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 failed outside joints work against that.
In and around Johnshaven, as anywhere, good window mastic starts with a clean, dry, properly prepared joint. For jobs in and around Johnshaven, choosing the right material for each joint is as important as a tidy finish.
Johnshaven is about 8 miles north-east of Montrose, in Aberdeenshire. Across the DD10 area, our applicators can take on window mastic. 161 places in Aberdeenshire are on our list. For nearby work, see our Aberdeen page.
We cover every part of DD10 for window mastic and the streets around it. Window mastic is available to properties on Square, Main Street and Mid Street and the roads around them. If you’re just outside Johnshaven, we cover Gourdon (3 miles north-east), St Cyrus (3 miles south-west), Inverbervie (4 miles north-east), Arbuthnott (5 miles north) and Laurencekirk (6 miles north-west). Within a short drive, we also cover Montrose (8 miles south-west), Stonehaven (13 miles north), Hillside (6 miles south-west) and Ferryden (8 miles south-west).
Around Johnshaven
Other landmarks nearby include Benholm Castle (2.1 miles north). Green spaces nearby include St Cyrus National Nature Reserve.
What affects the cost of window mastic
The price is agreed before any work begins. It takes into account:
- Mould in or behind the old joints
- How easy the joints are to reach
- How much old sealant there is and how hard it is to remove
- Working hours on commercial sites
Combining jobs into one visit is normally more efficient than separate visits, so it’s worth mentioning everything you’d like done. We’ll send you a clear quote for the lot.
Asking for a quote
What to tell us when you ask for a quote:
- What the problem is, such as mould, gaps, leaks or cracking
- The address or postcode of the job
- If it’s domestic, commercial or a hotel
- A few photos by email, if you can
Quotes start with a quick conversation. Describe the problem, the location and the size of the job. Whenever you’re ready, drop us a line at info@mrmastic.co.uk.
What we do, step by step
There’s no need to move everything out before we come, just the space around the work. We protect the rest, and the job takes a morning for a couple of windows and a door for a typical job. Outside jobs in Johnshaven need a dry day, because sealant won’t bond to a wet joint, so external jobs may need to move if the day turns wet. Work indoors isn’t affected.
- We check each frame and agree which ones need doing.
- We remove the old mastic and clean the frame and the wall.
- We fit backing rod in deep gaps so the sealant is the right depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- Finally we tidy up and check each joint.
Before we arrive
- Mention any tricky access
- On commercial sites, let us know about site rules
- Tell us about any previous sealing or DIY attempts
Getting a quote
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 talk you through the work and give you a clear price.
Read more
Landlord and commercial work in Johnshaven
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we will quote.
For anyone letting property in or around Johnshaven, several properties can go on one quote. Send us the addresses and the work at each, and photos by email help.
Common questions in Johnshaven
Will you come out to Johnshaven?
Yes. Johnshaven is within the area we cover, which takes in towns, villages and rural addresses. Our work covers the whole of Scotland. Let us know about access, parking and anything unusual about getting there when you book.
Does the coastal weather in Johnshaven 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.
Is it OK to seal over old sealant?
No, because it fails. The old sealant always comes out first.
Can you do several jobs on one visit?
Yes, we can. Several rooms, windows or areas can go on one quote.
Is the work guaranteed?
Yes, with our one-year guarantee. A yearly look at the joints helps them last.
What do you need from me for a quote?
The location, the problem and the rough size of the job. Photos by email help too.
Do you work for hotels and businesses?
Yes. We have worked for hotels, offices and other businesses and we are fully insured.
Is the new sealant paintable?
Not if it’s silicone. We choose the product with your decorating in mind, so mention it when you book.
Why deal with it now?
Failed mastic isn’t a reason to replace sound windows. If the frames and glass are in good order, resealing the joints is often all that is needed. Problems with the glass or gaskets are for a window company, and we’ll say so. Around Johnshaven, water from a failed joint in an older stone home can soak into timber and plaster.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Why choose Mr Mastic in Johnshaven
- Quality sealants from Arbo and Everbuild
- Sealant colour chosen to suit
- Neat joints and a tidy finish
- Over 20 years’ experience
Read our cost guide or customer reviews.
What the job involves on each surface
Composite doors
If the door itself is draughty, the issue may be the door seals or hinges rather than the frame mastic. We will tell you if that is what we find.
Timber windows & doors
Where timber has rotted at the joint, it needs repairing first. If we find rot, we will tell you before going ahead, as a joiner will need to deal with it.
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. Our tips:
- Avoid blasting the frames with a pressure washer
- Keep paint and stain on wooden frames in good order
- Ventilate rooms so frames don’t stay wet inside
- Use gentle cleaners on frames and sealant
Silicone can’t normally be painted, so mention any painting plans before work begins. There are paintable sealants for joints that need it.
Draughts get worse, not better. As the old mastic shrinks further, more air gets through, and heat escapes around the frame. Resealing closes it.