South Lanarkshire · Scotland
New Build Mastic in Forth
Problem with your new-build sealant joints in Forth? We remove the old material, prepare the joints and seal them properly, with a 12-month guarantee.
- Kitchen sealant that has pulled off the wall
- Sealant work across a run of new homes
- Skirting joints opening in the first winter
What the job involves on each surface
Windows and doors
Internal joints between frames and plaster often crack as a new house dries. We remove cracked sealant and apply a flexible one.
Show homes
We seal show-home bathrooms, kitchens and frames. Tell us when the home is open so we can plan around it.
New build mastic in Forth, done properly
Some new-home owners let the house settle before resealing. That makes sense for small gaps that are just cosmetic, but a seal that is letting water through needs doing now. We’re often asked to deal with gaps behind new kitchen upstands and messy sealant that spoils new finishes, on skirting & floors, kitchens and show homes.
For a place like Forth, the journey and access are planned in advance. Outdoor plot mastic needs dry weather, but indoor floor and skirting joints can be sealed whatever the forecast.
Big or small, it’s backed by our one-year guarantee in Forth and across South Lanarkshire.
- Where
- Forth (ML11)
- Region
- South Lanarkshire
- Guarantee
- One year on every job
- Price
- A clear price before we start
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
How to look after the new joints
Looking after new joints is easy:
- Open a window or run the fan after bathing
- Avoid running a DIY bead over the old one
- Report sealant problems to your builder during the snagging period
- Look at the sealant regularly in the first couple of years
Follow the cure time we give you before the area gets wet. Most silicones need around a day to cure enough for use.
Mould takes hold quickly in sealant that has gaps or lifted edges. Dealing with it before it goes black saves a harder job later.
What happens on the day
The work is kept neat and contained to the area we’re working on, so you can carry on as normal. The job normally takes a few hours in a single home, and we tell you how long to leave it before we go. In smaller Scottish places, parking is usually less of an issue than access and distance. Let us know how to find you and how to reach the joints, and the visit is planned around that.
- We start by going through the snagging items or plot schedule with you.
- The failed sealant is removed completely, with no layer left behind.
- Joints are vacuumed and cleaned of building dust.
- Primer goes on where the surface and product need it, then the new sealant.
- We tool every joint neatly and tell you when each area can be used.
How to prepare
- For indoor joints, keep the area dry beforehand if you can
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any leaks or damp you’ve noticed
Ask for a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email photos if that’s easy.
Related advice
Forth questions
Do you work for landlords with property near Fauldhouse station?
Yes, we work for letting agents and landlords. You can send an email to info@mrmastic.co.uk with the address and a few details, and we will give you a fixed price before we start.
Can you do new build mastic in Forth?
Yes, Forth is within the area we cover. Our work covers the whole of Scotland. Just send an email to info@mrmastic.co.uk with a few details of the job.
Can you quote for more than one area?
Yes. Tell us about everything you’d like done and we will quote it together.
Will the old sealant be removed?
Yes. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Are you ARBOMaster approved?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Do you work through snagging lists?
Yes. Send us the sealant items on the list, with pictures if you can and we’ll give you a quote. We’ll tell you if anything on it isn’t a sealant job.
Should I go to my builder first?
Start with the builder if you are in the snagging or warranty period. If it is not resolved, we will cut it out and reseal it.
Is it worth resealing while the house is still settling?
It depends on whether water is getting through. Failed seals in wet areas need doing now, but cosmetic gaps can wait for movement to slow.
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Also near Forth
More services for Forth
Leave it or put it right?
Running a new bead over the builder’s sealant might look tidy for a few weeks, but it will not bond to the old layer. A lasting seal starts with removing the old one completely. 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.
Leaving a failed joint usually makes the job bigger, not smaller. If you are unsure, send an email to info@mrmastic.co.uk and we’ll give you an honest view and a quote.
Why Forth clients choose us
- Approved under the ARBOMaster scheme
- White, clear, grey or coloured to suit, where the product allows
- 4.9 on Google from 180+ five-star reviews
- Every job guaranteed for a year
Take a look at what affects the cost and our reviews.
What affects the cost of new build mastic
We quote each job individually. These are the things that affect it:
- Mould in or behind the old joints
- Working hours on commercial sites
- The product the joint needs
- Whether old sealant or filler has to be cut out
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all play a part.
Asking for a quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- Where the job is, and your postcode
- Whether it has been sealed before
- How we’d reach the joints
- Pictures of the joints, sent by email
We don’t publish a price list. Instead, your job gets its own clear quote. To get started, email us at info@mrmastic.co.uk.
When to call us in Forth
The first winter with the heating on dries a new home quickly. Skirting, frames and worktops pull away slightly and cracks appear in the sealant.
Common reasons people contact us are:
- Gaps behind new kitchen upstands
- Leaking shower tray seals in a new home
- Skirting joints opening in the first winter
- Sealant applied over dusty or wet surfaces
If you’ve bought a new home near Fauldhouse station, the sealant around baths, showers and frames is worth checking in the first year or two.
Comparing quotes
- What the quote includes, VAT included or not
- How the surfaces are prepared before sealing
- What happens if they find a problem under the old sealant
- Is the old sealant removed completely?
What new build mastic looks like in Forth
Many new homes in Scotland are timber-framed, and as the frame dries and settles, skirting and sealant joints can open up.
Around Forth, as everywhere, new build mastic is only as good as the preparation behind it.
Forth is about 6 miles north-east of Carluke, in South Lanarkshire. Homes, rented property, offices and hotels in Forth can book us for new build mastic. Every job comes with our one-year guarantee. Forth is one of 139 towns and villages in South Lanarkshire we cover for new build mastic. Edinburgh is on our list too, about 22 miles from Forth.
We work across the ML11 postcode area for new build mastic and the streets around it. Whether your property is on Main Street, Forkens and Hailstonegreen or anywhere close by, our applicators can take on the job. Other places close to Forth include Greenwall (1 mile north-west), Wilsontown (1 mile north-east), Climpy (1 mile north-west), Haywood (2 miles north-east) and Braehead (2 miles south-east). Larger places within reach include Hamilton (14 miles west), Larkhall (11 miles west), Carluke (6 miles south-west), Lanark (7 miles south-west), Bothwell (15 miles west) and Viewpark (15 miles west).
Local landmarks in Forth
For rail, the closest station is Fauldhouse station, about 4 miles north. Well-known places in the area include Couthally Castle (4 miles south-east).