Aberdeen · Scotland
Window & door mastic in Cornhill, Aberdeen
Window mastic for Cornhill, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Rain getting in at the frame or under the sill
- Draughts coming in around windows and doors
- Mastic that’s falling out in pieces
Window mastic in Cornhill, done properly
Most frames have an outside joint and an inside one. Outside, the mastic keeps rain out; the internal joint closes the gap to the plaster and stops draughts. Either or both can be done. Common call-outs are for whistling draughts around closed windows and draughty joints inside around the window, on uPVC windows, composite doors and timber windows & doors.
Tenement flats in Scotland’s cities often have windows high above the street, where failing mastic is easy to miss. Access is the first thing to plan for a job in Cornhill, and in a tenement the outside of the building may be a shared repair.
Whatever the size of the job, you get the same one-year guarantee in Cornhill and across Aberdeen.
- Place
- Cornhill (AB16, AB25, AB24)
- Wider area
- Aberdeen
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- info@mrmastic.co.uk
- Updated
- 26 October 2026
How the job changes by surface
Patio & French doors
Heavy door frames can move more than windows. The sealant must cope with it without cracking.
Timber windows & doors
Timber moves with moisture as well as heat, so a flexible sealant is essential. We seal onto sound, dry paintwork or timber.
Your questions about window mastic in Cornhill
I let a flat near Aberdeen station. Can you help?
Yes, we work for letting agents and landlords. Just email us at info@mrmastic.co.uk and tell us about the property, and we’ll give you a clear price.
Does living near the coast affect window mastic in Cornhill?
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.
How long before the joint can be used?
Most sealants are touch-dry well before they’re fully cured. We’ll tell you how long to leave the joint before we leave.
What do you need from me for a quote?
A short description and the location, plus pictures if you have them. If we need more, we’ll ask.
Do you work on first-floor windows?
Yes, in most cases. Access is planned before any work starts.
Is it worth trying it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Can you seal over the old sealant?
No, and we never do. It can look neat for a few weeks, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
Can new window sealant be painted?
Not if it’s silicone. We choose the product with your decorating in mind, so mention it when you book.
Honest limits
It helps to know what we cannot do too:
- A failed sealed unit that has misted up
- Draughts through the window seals rather than the frame
- Broken hinges, locks or handles
Not sure which it is? You can send an email to info@mrmastic.co.uk and we’ll tell you honestly.
Where we work in Cornhill
- Window sills
- Timber windows & doors
- Aluminium frames
- Patio & French doors
- Composite doors
- uPVC windows
What we do, step by step
On the day, we look over the joints with you first, so you know exactly what we’re doing. Surfaces next to the work are protected before we start. The work generally takes anything from an hour or two to a full day, depending on how many frames there are. Inside a flat in Cornhill, the job is planned with you; outside, shared parts may need the factor or other owners involved. Tell us which applies when you book.
- Each frame is looked over and we agree which ones need resealing.
- We remove the old mastic and clean the frame edge and wall.
- Where the gap is deep, backing rod goes in first.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
Before we arrive
- Keep children and pets away from the work area
- Let us know about stairs, lifts or work at height
- Clear the area around the work
How to get a quote
Getting a quote is simple: let us know the job and the location. A few pictures by email make the job easier to understand.
Related advice
How to look after the new joints
Looking after new joints is easy:
- Keep paint and stain on wooden frames in good order
- Paint up to the joint, not over it
- Keep drainage slots and sill grooves clear
- Avoid blasting the frames with a pressure washer
Check the drainage slots in the frames aren’t blocked, so water can run away instead of sitting against the joint.
Water trapped behind a failed joint can start rot in timber frames and sills. Once wood has rotted, it needs repair before it can be sealed, so it pays to reseal before that happens.
Do you need window mastic in Cornhill?
Every frame moves through the day. A plastic or aluminium frame lengthens in sunshine and shortens as it cools, while the brick or render around it hardly moves. If the sealant can’t stretch, it splits.
The problems people normally mention when they call are:
- Cracked sealant at the sill ends
- White mastic on grey or black frames
- Draughts coming in around windows and doors
- Black, perished sealant on frames
Rented homes near Aberdeen station change hands often, and sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
What your quote should include
- What happens if the job turns out different
- How long the guarantee is
- What product goes in the joint
- How long to leave it before use
Work for landlords, hotels and businesses
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
Housing providers, facilities teams and property managers book us too. Several sites can go on one quote, and we’re fully insured for the work.
What affects the cost of window mastic
Jobs vary more than people expect. What affects the quote:
- Mould in or behind the old joints
- How many rooms, windows or areas are involved
- Which sealant suits the joint
- Whether the work is at height
The cost reflects the work involved, not a rough estimate. That’s why we ask a few questions first and agree the price before starting.
Helping us quote
Photos help, but a description is a good start. Please mention:
- If someone has resealed it before
- Access, such as stairs, a lift or height
- The address or postcode of the job
- Whether it’s a home or a business
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email photos if that is easy.
Places near Cornhill
What else we do in Cornhill
What window mastic looks like in Cornhill
Cornhill 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. Under the Tenements (Scotland) Act 2004, shared parts of a tenement, such as the roof and outside walls, are looked after by the owners together, and many buildings use a factor to arrange it. Who owns the windows depends on the title deeds.
Homes close to St Ninian's Church include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. If you look after a building such as Northfield Academy, the mastic around its windows and doors needs looking after like any other building’s.
Cornhill is about 1 mile north-west of Aberdeen, in Aberdeen. Wherever you are in the AB16 postcode area, we cover window mastic for homes and businesses. We cover 63 towns and villages across Aberdeen, from the larger towns to small villages.
Jobs for window mastic in AB16, AB25 and AB24 is quoted and booked the same way as anywhere else. Streets in the area include Rowan Road, Morgan Road and Cairncry Road, all of which we cover. Being close to the A92, Cornhill is easy for our applicators to reach. We also cover Cummings Park (1 mile north-west), Aberdeen (1 mile south-east), Midstocket (1 mile south), Berryden (1 mile east) and Rosemount (1 mile south-east). Larger places within reach include Dyce (4 miles north-west), Portlethen (7 miles south), Cults (3 miles south-west), Cove Bay (4 miles south-east), Torry (3 miles south-east) and Peterculter (6 miles south-west).
Landmarks near Cornhill
Locally, jobs take us to homes and businesses close to Oakbank School, Gilcomstoun Primary School and Stewart Park and the streets around them. The closest station to Cornhill is Aberdeen station, about 1.8 miles south-east. Other landmarks nearby include King's Museum (1.3 miles north-east) and Cowdray Medical Pavilion (less than half a mile south). Green spaces nearby include Rubislaw Quarry and Gallows Hill.