Scottish Borders · Scotland
Midlem Window Mastic
Mastic around window and door frames, sills and patio doors for householders, landlords and businesses in Midlem. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Gaps left after new windows were fitted
- A bead that doesn’t match the frame
- Cracked internal joints between frame and plaster
Window mastic for homes and businesses in Midlem
The mastic around a window or door seals the gap between the frame and the wall. Once that seal fails, wind and rain find the gap. The old mastic is removed and the joint resealed with a flexible exterior sealant. We work on uPVC windows, composite doors and patio & French doors, and common reasons people get in touch are rain getting in at the frame or under the sill and cold air getting in at the frame edge.
Many older Scottish homes still have timber windows set into stone walls. The sealant has to suit the stone, which rules out acetoxy silicones that can mark or attack it.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Location
- Midlem (TD7)
- Region
- Scottish Borders
- Cover
- One year on every job
- Quote
- A clear price before we start
- info@mrmastic.co.uk
- Updated
- 26 October 2026
Midlem homes and 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. Many older homes in Scotland have sash and case windows, and the joint between the box frame and the stone or render is traditionally pointed with sand mastic.
Letting a property close to Tweedbank station? Then renewing tired window mastic between tenants heads off draught and damp complaints.
Midlem is about 6 miles south of Galashiels, in the Scottish Borders. Jobs in Midlem get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Across the Scottish Borders, we cover 89 places, and Midlem is one of them. Edinburgh is on our list too, around 33 miles away.
Our applicators cover all of TD7 for window mastic. Midlem sits on or near the B6453, which makes travel easy. We also cover Lilliesleaf (2 miles south), Bowden (3 miles north-east), Belses (3 miles south-east), Selkirk (4 miles west) and Newtown St Boswells (4 miles north-east). Within a short drive, we also cover Galashiels (6 miles north), Hawick (8 miles south), Kelso (13 miles east), Jedburgh (9 miles south-east), Wilton (8 miles south) and Innerleithen (13 miles north-west).
What’s near Midlem
The closest station to Midlem is Tweedbank station, roughly 4.7 miles north. Nearby you’ll also find Dingleton Hospital (3.7 miles north) and Castle Holydean (1.9 miles north). The countryside around Midlem includes Eildon Wester Hill and Hare and Dunhog Mosses.
What sealant work cannot fix
A few problems are outside what sealant work can do:
- A frame that has rotted at the joint
- Broken hinges, locks or handles
- Damp problems in the wall away from the window
If you are not sure, just email us at info@mrmastic.co.uk and we will give you a straight answer before you book.
What we seal
- Composite doors
- Timber windows & doors
- Window sills
- uPVC windows
- Aluminium frames
- Patio & French doors
Common problems we fix in Midlem
Plenty of failed mastic was poorly applied in the first place. Mastic laid onto dusty, damp or crumbling surfaces didn’t grip properly, so it comes away long before its time.
Look out for any of the following:
- White mastic on grey or black frames
- Mastic that is falling out in pieces
- Water coming in at the bottom corners of a door
- Cracked internal joints between frame and plaster
In and around Midlem, as anywhere, good window mastic starts with a clean, dry, properly prepared joint.
Before you book anyone
- Is VAT in the price?
- How the joint is cleaned and prepared
- What happens if they find a problem under the old sealant
- Is the old sealant removed completely?
Should I try it myself first?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
If you are set on DIY, put the effort into 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.
FAQs for Midlem
Do you work for landlords with property near Tweedbank station?
Yes. We work for landlords and agents as well as householders. Just email us at info@mrmastic.co.uk with the address and what needs doing, and we will give you a clear price.
Is Midlem within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers the whole of Scotland. Just mention lanes, gates or anything else about the route when you book.
How do I get a quote for window mastic in Midlem?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. You will get a clear quote before work begins.
Can you seal over the old sealant?
No, because it fails. We remove every bit of old sealant first, so the new sealant bonds properly.
Do you have sealant for grey or black windows?
Normally, yes. Mention the frame colour when you ask for a quote and we’ll use the nearest match.
Will you leave a mess?
Tidy work is part of the job. Nearby surfaces are protected, and we clear up when we’re done.
What should I tell you?
Let us know what needs doing and where, plus photos if you have them. If we need more, we’ll ask.
Should I try DIY first?
It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
Why act early in Midlem
Draughts and leaks do not always mean new windows. Where the frames are sound, new mastic normally deals with draughts and leaks at the edges. If we find failed glass units or worn seals, we will tell you. Around Midlem, water from a failed joint in an older stone home can soak into timber and plaster.
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all make a difference, and we will explain the quote if you ask.
Why choose Mr Mastic in Midlem
- Experience in homes, commercial sites and hotels
- A choice of colours where the product allows
- We never seal over old sealant
- 20+ years of sealant experience
Take a look at how sealant jobs are priced and customer reviews.
Towns and villages near Midlem
Also in Midlem
How the job changes by surface
Patio & French doors
Heavy door frames can move more than windows. A flexible sealant copes with that without cracking.
uPVC windows
uPVC expands and contracts noticeably with temperature, so the joint needs a low-modulus sealant that stays flexible. We match white, brown, anthracite grey and black frames.
Landlords, agents and businesses in Midlem
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
We also work for property managers and facilities teams in Midlem and across the Scottish Borders. We can quote a run of properties together.
What we do, step by step
We bring everything the job needs with us, so there’s nothing for you to buy. Once we’ve agreed what’s being done, we protect the area and start. It normally takes a few hours for a handful of frames, longer for a whole house. Somewhere like Midlem may be a longer drive, and the journey is planned ahead. Tell us about tracks, gates, a ferry crossing or anything unusual about getting there.
- Each frame is looked over and we agree which ones need resealing.
- 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.
- Every joint is tooled smooth and checked before we leave.
How to prepare
- On commercial sites, let us know about site rules
- Try not to wet indoor joints just before the visit
- Clear items away from the joints we’re working on
Get a quote
Call for a quick quote, or email us if that’s easier. Describe what needs sealing and we will talk you through the work.