Na h-Eileanan Siar · Scotland
New-build mastic & snagging in Knock, Na h-Eileanan Siar
Plot mastic for developers and snagging failed sealant in new homes in Knock, with a one-year guarantee on every job. Call for a quick quote.
- Beads laid onto grit and dust from the build
- Joints pulling apart as timber shrinks
- Frame joints opening as the plaster dries
When to call us in Knock
Sealant is often one of the last jobs before handover. Dusty, unprimed joints are common, so the bead never bonds properly.
It’s worth asking for a quote if you see:
- Sealant work across a run of new homes
- Joints pulling apart as timber shrinks
- Skirting joints opening in the first winter
- Shower seals failing in the first year or two
In and around Knock, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
What your quote should include
- How the surfaces are prepared before sealing
- Are they insured?
- The length of the guarantee
- Is VAT in the price?
How we handle new build mastic in Knock
Snagging sealant properly means taking the failed bead out completely. Fresh silicone can’t bond to the old layer, so the joint is cut out, cleaned, dried and resealed. We are often asked to deal with gaps behind new kitchen upstands and internal frame sealant that has split, on bathrooms & en suites, kitchens and plot handovers.
Timber frame is common in newer Scottish homes, and it settles over the first years, which shows as gaps at skirtings and floor joints. In older homes, timber floors move through the year too.
Every job comes with a 12-month guarantee.
- Place
- Knock (HS2)
- Region
- Na h-Eileanan Siar
- Guarantee
- 12 months on all our work
- Quote
- A clear price before work begins
- info@mrmastic.co.uk
- Updated
- 26 October 2026
What the job involves on each surface
Skirting and floors
New homes often develop a gap between skirting and floor. We seal it with a flexible sealant that copes with the movement.
Windows and doors
External mastic around new windows and doors is sometimes rushed or missed. It’s resealed with an exterior sealant suited to the frame and wall.
Quotes for new build mastic in Knock
Jobs vary more than people expect. What affects the quote:
- Working hours on commercial sites
- The product the joint needs
- Whether the work is at height
- Any mould that needs treating
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. You will know the price before we begin.
Asking for a quote
Photos by email are helpful but not essential. Try to tell us:
- Where the job is, and your postcode
- If it’s domestic, commercial or a hotel
- How we’d reach the joints
- If someone has resealed it before
To get a quote, drop us a line at info@mrmastic.co.uk and tell us where the job is and what the problem looks like. You’ll have a clear quote before work begins.
Your questions about new build mastic in Knock
Is Knock within the area you cover?
Yes. Knock is within the area we cover, which takes in towns, villages and rural addresses. We work across all of Scotland, including the islands, where work is planned around ferry crossings. Let us know about access, parking and anything unusual about getting there when you book.
Is Knock in your area for new build mastic?
Yes, Knock 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 work from my snagging list?
Yes. We often work straight from a snagging list. We will go through the sealant items and agree what we’ll do.
My new home is still under warranty. Should I contact you?
Report it to the builder first while you are covered. Once that is done, or if they will not put it right, we can reseal it properly.
Do you use white or clear sealant?
It depends on the joint: white or clear in most bathrooms, and a colour to suit worktops, frames and floors elsewhere. We agree the colour before we start.
Do you guarantee your work?
Yes. All our work carries our one-year guarantee.
Where are you based?
Mr Mastic is based in Crawley. Our applicators cover Knock, along with the rest of our area.
How long before the joint can be used?
Different products cure at different speeds, so please follow the time we give you.
Nearby places to Knock
Other services in Knock
DIY versus a professional finish
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
What we do, step by step
All our tools and materials come with us in the van, so there’s nothing for you to buy. After a quick look at the joints together, the area is protected and the work begins. Most jobs take a few hours for most snagging lists, longer for a run of plots. For a place like Knock, longer drives are planned in advance. Mention tracks, gates, ferries or anything else about the route.
- We start by going through the snagging items or plot schedule with you.
- Every bit of the old builder’s sealant is cut out down to clean surfaces.
- We clean out the dust and grit left from the build.
- We prime where needed and apply a sealant suited to each joint.
- Each bead is tooled and the cure times explained.
How to prepare
- Clear the area around the work
- Mention any sign-in or site rules at work premises
- Mention any tricky access
Getting a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that is easy.
Advice
What we cannot put right
Before booking, it’s worth knowing the limits:
- Cracked trays, tiles or worktops
- Deciding who is responsible under a builder’s warranty
- Structural cracks in walls or ceilings
Not sure which it is? You can send an email to info@mrmastic.co.uk and we will tell you honestly.
Where we work in Knock
- Plot handovers
- Show homes
- Skirting & floors
- Bathrooms & en suites
- Windows & doors
- Kitchens
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. A few tips:
- Resist patching a failed seal with a tube from the DIY shop
- Wait for the cure time before using a resealed shower
- Record problems with dated pictures
- Watch for new gaps as the house dries out
Watch the joints as the house settles. Hairline gaps can open as timber and plaster dry and can be resealed later.
Do not let the snagging period run out with sealant problems unreported. Once it ends, the repair may be down to you.
New build mastic in Knock: local notes
Knock is close to the coast. New homes near the sea put their outside mastic to work from day one, so it’s worth checking at snagging. Work on the islands has to be planned around ferry crossings and the weather, so give us as much notice as you can.
For jobs in and around Knock, choosing the right material for each joint is as important as a tidy finish.
Knock (Gaelic: An Cnoc) is in Na h-Eileanan Siar. Homes, rented property, offices and hotels in Knock is covered for new build mastic. Every job comes with our 12-month guarantee. Our Na h-Eileanan Siar coverage runs to 87 places, Knock among them.
We work across HS2 for new build mastic. Whether your property is on Seaview and A' Chnuic or anywhere close by, we can help. You will find Knock on the A866, so it’s easy for us to get to with everything needed for new build mastic. Other places close to Knock include Na h-Eileanan an Iar (1 mile west), Aiginis (1 mile west), Lower Bayble (1 mile east), Garrabost (2 miles north-east) and Pabail Uarach (2 miles east). For island and remote addresses, the job takes a little more planning.
Near you in Knock
Well-known places in the area include Western Isles Hospital (4.5 miles west).