Scottish Borders · Scotland
Window Mastic in Gavinton
Window mastic for Gavinton, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- White mastic on grey or black frames
- Black, perished sealant on frames
- Water coming in at the bottom corners of a door
Window mastic in Gavinton, done properly
Colour matters on a frame. White, brown, anthracite grey, black and clear sealants are all available, so the bead blends with the window rather than framing it. We work on composite doors, patio & French doors and aluminium frames, and people most often call us about mastic that has split away from the wall and cold air getting in at the frame edge.
In and around a place like Gavinton, homes range from older stone-built cottages to newer houses. Exposed frames and sills take the full force of wind-driven rain, so the mastic there works hard.
We stand behind the work with a one-year guarantee, so you are not left on your own once the job is done.
- Place
- Gavinton (TD11)
- Wider area
- Scottish Borders
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- info@mrmastic.co.uk
- Updated
- 26 October 2026
Signs you need window mastic in Gavinton
Older frames were often sealed with products that set hard. Once it has hardened, the frame’s movement tears it from the wall, leaving a hairline gap down one side.
The problems people generally mention when they call are:
- Damp patches on the reveal after heavy rain
- Whistling draughts around closed windows
- Mastic that’s falling out in pieces
- Gaps left after new windows were fitted
Schools such as Berwickshire High School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
What your quote should include
- How much experience the applicator has
- The length of the guarantee
- How the surfaces are prepared before sealing
- Which colour the sealant will be
Looking after it afterwards
After the cure time, these simple habits help:
- Don’t use solvent cleaners on the joint
- Ventilate rooms so frames do not stay wet inside
- Use gentle cleaners on frames and sealant
- Avoid blasting the frames with a pressure washer
Most silicone sealants won’t take paint, so mention any painting plans before any work starts. There are paintable sealants for joints that need it.
A failed joint lets water into the wall a little at a time. Often the first sign is a damp patch inside or flaking paint on the reveal. Catching it early keeps the fix to a reseal.
Window mastic in Gavinton: local notes
Many older homes in Scotland have sash and case windows, often pointed into the wall with traditional sand mastic. Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and sound outside sealant is part of that.
If you live in an older home near Gavinton Parish Church and Churchyard, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Gavinton is in the Scottish Borders. Whether you are in the middle of Gavinton or further out, window mastic is available for homes and businesses alike, from flats and houses to offices and hotels. 89 places in the Scottish Borders are on our list, large and small. We also work in Edinburgh, around 35 miles away.
Postcode districts we cover here for window mastic: TD11. If you need window mastic at a property on Main Street, South Street and The Glebe or anywhere close by, our applicators can take on the job. We also cover the places around Gavinton: Clockmill (1 mile north), Duns (1 mile north-east), Preston (3 miles north-east), Swinton (5 miles south-east) and Greenlaw (5 miles south-west). We also work in nearby towns such as Kelso (11 miles south), Eyemouth (13 miles north-east), Earlston (15 miles south-west), Lauder (15 miles west) and Chirnside (7 miles north-east).
Landmarks near Gavinton
Nearby you’ll also find Jim Clark Motorsport Museum (1.4 miles north-east) and Langton Castle (1.1 miles north-west). For a walk, there’s Duns Castle nature reserve and Duns Law.
How the visit works
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The work itself takes most of a day for a typical house, less for a few frames from start to finish. Around Gavinton, distance and access matter more than parking. Let us know how to find you and how to reach the joints.
- First, we go round the frames with you and agree the list.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- A flexible exterior sealant is applied in a colour to suit the frame.
- We tool each bead neatly and check every joint is closed.
How to prepare
- Tell us about any water getting in
- Tell us about any previous sealing or DIY attempts
- Let us know about stairs, lifts or work at height
Getting a quote
Need a quote? Please drop us a line at info@mrmastic.co.uk with a few details. We will explain what we’d do and give you a clear quote before we start.
Related advice
Why deal with it now?
Once mastic fails, rain can get between the frame and the wall. Left long enough, it can stain inside walls, spoil plaster and rot wooden frames. A reseal is a much smaller job. Exposed walls in smaller Scottish places take a lot of wind and rain, and damp in stone or harled walls takes a long time to dry once water gets behind a joint.
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we’ll explain what it covers.
Why Gavinton clients choose us
- Colour agreed with you before we start
- A 12-month guarantee on all work
- Colour picked to suit the job
- Arbo and Everbuild products
Read what affects the cost or our reviews.
DIY sealant or a professional job?
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
What else we do in Gavinton
Questions from Gavinton
Do you cover smaller places like Gavinton?
Yes. Gavinton is within the area we cover, which takes in towns, villages and rural addresses. Our work covers the whole of Scotland. Just mention lanes, gates or anything else about the route when you book.
Is Gavinton in your area for window mastic?
Yes, Gavinton is within the area we cover. We work across all of Scotland. You can email us at info@mrmastic.co.uk and let us know what needs doing, and we will send you a clear quote.
Can you do the inside joint as well?
Yes. Draughts often come through the inside gap too, so it can be worth sealing both.
Does the work come with a guarantee?
Yes. Each job is covered for 12 months.
Can I paint over the new sealant?
Most silicone can’t be painted. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.
Are you fully insured?
Yes. We are fully insured for every job we do.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator.
Do you have sealant for grey or black windows?
Yes, we choose a colour to suit the frame. Anthracite grey, black, brown and white cover most frames, with clear as an option.
How the job changes by surface
Window sills
Where a sill meets brick or render, the ends often crack first. A tight seal at each end keeps rain out of the wall.
Timber windows & doors
On period timber windows, traditional sand mastic is sometimes the better choice. We can talk through the options.
Quotes for window mastic in Gavinton
Call for a quick quote. What matters most is:
- How much old sealant there is and how hard it is to remove
- Mould in or behind the old joints
- Whether the work is at height
- How many rooms, windows or areas are involved
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
What we need to know
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- Whether it has been sealed before
- If it’s domestic, commercial or a hotel
- The problem you’ve noticed
- How many joints, rooms or windows are involved
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 explain what’s involved.