Highland · Scotland
Window Mastic in Forss
Mastic around window and door frames, sills and patio doors for Forss, backed by a one-year guarantee. Ask us for a quote.
- Rushed sealant from a window installation
- Leaking joints at the ends of sills
- Water coming in at the bottom corners of a door
Why it’s worth doing now in Forss
Getting a straight, even bead on an outside frame takes practice, especially on upper floors. A professional job is cut out properly, backed where needed and finished neatly, in a sealant suited to the wall. Around Forss, water from a failed joint in an older stone home can soak into timber and plaster, which is a far bigger job than the sealant.
We do not show prices on the website, because the cost depends so much on the job itself. Call for a quick quote.
Why choose Mr Mastic in Forss
- Domestic, commercial and hotel work
- Every job guaranteed for a year
- Fully insured
- Neat joints and a tidy finish
Take a look at what affects the cost or our reviews.
Window mastic in Forss, done properly
From a single sill to a whole house of windows, the work is priced before anything is done. To get one, email us at info@mrmastic.co.uk with the number of frames and any access details. We work on uPVC windows, patio & French doors and timber windows & doors, and common reasons people get in touch are cold air getting in at the frame edge and leaking joints at the ends of sills.
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.
We stand behind the work with a 12-month guarantee, so you’re not left on your own once the job is done.
- Location
- Forss (KW14)
- Region
- Highland
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
How it works
We keep the work tidy and contained to the area we’re working on, so you can get on with your day. Expect the work to take anything from an hour or two to a full day, depending on how many frames there are. Outdoor work around Forss depends on the weather, as sealant needs a dry surface, so an outdoor job can move if the forecast changes. Work indoors is not affected.
- First we look at every frame and agree the list.
- We remove the old mastic and clean the frame and the wall.
- Deep gaps are filled with backing rod to set the depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- We clear up and check every joint is fully closed.
Getting ready for the visit
- For indoor joints, keep the area dry beforehand if you can
- Clear items away from the joints we’re working on
- Keep pets and children clear of the area while we work
How to get a quote
For a quick quote, get us on the phone, or email us if that is easier. Describe what needs sealing and we will explain what’s involved and give you a clear quote.
Related advice
Can I do it myself?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly.
How the job changes by surface
Aluminium frames
Large aluminium doors have long joints down each side and across the head, and the bottom joint sees the most water. Each is cleaned, backed where deep and resealed.
Patio & French doors
Not every patio door leak is a mastic problem: worn seals, blocked drainage slots or a poor threshold detail can be the cause. We look for the cause first.
Common questions in Forss
Is window mastic in a coastal place like Forss any different?
Coastal homes put outside sealant through more weather than inland ones, so preparation and the right sealant matter all the more. It’s worth checking the walls that face the sea first.
Can you help a landlord with a rental near Thurso station?
Yes. We work for landlords and letting agents as well as homeowners. Just drop us a line at info@mrmastic.co.uk with the address and what needs doing, and we’ll give you a clear quote.
Do I need to be at home?
That depends on where the joints are. For work indoors, someone needs to let us in, while outside work can sometimes be arranged differently.
Will new mastic stop draughts?
If the draught is coming in around the frame, yes. If it’s coming through the window seals, we will tell you.
Are you insured?
Yes. We’re fully insured, and we’ve been doing sealant work for more than 20 years.
Can you do the inside joint as well?
Yes, we do both. Inside, the joint between frame and plaster is sealed neatly, using a paintable sealant if you want to decorate.
How long should I leave it?
It depends on the product and the temperature. We tell you how long to leave it before we go.
Can new window sealant be painted?
Most silicone cannot be painted. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.
Frames and glazing around Forss
Forss 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 sound outside sealant is part of that.
For landlords with property near Thurso station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. Around Forss, as everywhere, window mastic is only as good as the preparation behind it.
Forss is about 4 miles west of Thurso, in Highland. Forss gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. We cover 253 towns and villages across Highland.
Jobs for window mastic in KW14 is quoted and booked the same way as anywhere else. We also cover the places around Forss: Westfield (3 miles south), Janetstown (3 miles south-east), Scrabster (3 miles east), Glengolly (4 miles south-east) and Thurso (4 miles east). Island and remote addresses take a little more planning, so tell us where you are when you ask for a quote.
Around Forss
Forss’s nearest station is Thurso station, roughly 4.2 miles east. Well-known places in the area include Thurso Heritage Museum (3.8 miles east) and Scrabster Castle (3.8 miles east).
More services for Forss
For landlords and businesses
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Letting agents often deal with us directly. Tell us the address, the job and how access works.
Honest limits
We won’t take on work that will not last, so these are the limits:
- Rotten timber, which needs a joiner first
- A sash or casement that won’t close properly
- Condensation trapped between the panes
If in doubt, email us at info@mrmastic.co.uk and we will say what we think.
Surfaces we seal
- Composite doors
- Timber windows & doors
- Window sills
- Aluminium frames
- uPVC windows
- Patio & French doors
Aftercare tips
No joint lasts for ever, but care makes a real difference. A few tips:
- Keep drainage slots and sill grooves clear
- Check the mastic once a year
- Paint up to the joint, not over it
- Wipe condensation off the frames
Have a look at the joints once a year, ideally after winter. Cracks and lifting edges are easy to spot early, and if anything looks wrong, just send an email to info@mrmastic.co.uk.
Look out for the warning signs: split or missing mastic, gaps, damp patches inside or black mould on the reveal. If you notice one, it’s time to get the joint looked at.