Isle of Wight · England
Sand mastic for sash & case windows in Blackgang, Isle of Wight
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Blackgang, with a one-year guarantee on every job. Call for a quick quote.
- Gaps where the frame meets the masonry
- Draughty sash windows at the surround
- Patchy fillers round a sash window
What we do, step by step
When we get to you, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. After that, the work takes a few hours per window, depending on the condition of the joints. In a small place like Blackgang, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
Getting ready for the visit
- Let us know about parking restrictions
- Mention if the joints have been sealed before
- Keep children and pets away from the work area
Getting a quote
We do not publish a price list. Instead, we send you a clear quote for your job. To get started, call 0345 464 0079 or drop us an email.
Related advice
Sand mastic in Blackgang
A silicone bead around a sash window can look out of place and doesn’t suit the building. Sand mastic is the traditional choice, and we can replace one with the other. If you are dealing with modern sealant on a period surround and weathered mastic on the most exposed windows, we can put it right, whatever the surface.
Somewhere as small as Blackgang, older homes often have timber frames set in stone or brickwork. Not every older frame suits a modern silicone bead, and sometimes a traditional sand mastic is the better choice.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Location
- Blackgang (PO38)
- Region
- Isle of Wight
- Cover
- One year on every job
- Quote
- A clear price before work begins
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What sand mastic looks like in Blackgang
Blackgang is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That’s hard on the mastic around older windows and doors, especially on the side facing the sea. Historic houses like Wolverton Manor (about 4.1 miles north-west) are a reminder that the area around Blackgang has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
If you live in an older home near St Andrew's Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Managing a site like Niton Primary School? Then its window and door frames need their mastic kept sound, just like a home’s.
Blackgang is about 6 miles south-west of Shanklin, in the Isle of Wight. Every kind of property in Blackgang can book us for sand mastic, old or new, large or small. Every job comes with our one-year guarantee. Our area takes in 125 places across the Isle of Wight, large and small. You can also see our page for Portsmouth, about 18 miles away.
Every address in PO38 is within our area for sand mastic. If you are just outside Blackgang, we cover Chale (1 mile north-west), Niton (1 mile east), Puckaster (1 mile south-east), Pyle (1 mile north-west) and Bierley (1 mile north-east). We also work in nearby towns such as Newport (8 miles north), Ryde (11 miles north-east), Cowes (12 miles north), Sandown (8 miles north-east), Shanklin (6 miles north-east) and Ventnor (4 miles east). Remote and island addresses need a little more planning, so tell us where you are when you ask for a quote.
Near you in Blackgang
Nearby you will also find Blackgang Sawmill Museum (less than half a mile west) and Whitecroft Hospital (5.7 miles north). The countryside around Blackgang includes Stenbury Down.
DIY sealant or a professional job?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Keeping the joints in good condition
Simple care keeps the joints in good condition. Our advice:
- Find out about consent before window work on a listed home
- Get any rot dealt with first
- Renew mastic before redecorating the windows
- Make sure water runs off the sill
Don’t touch or press the mastic while it hardens. It forms a skin fairly soon but needs longer to fully harden.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall so early renewal protects both.
What happens if it’s left?
New mastic over crumbling mastic will not hold. Raking out and preparing the joint gives it a sound base so the new mastic stays put. In a small place like Blackgang, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please phone 0345 464 0079 or send us an email.
Why choose Mr Mastic in Blackgang
- Arbo and Everbuild products
- Any old sealant cut out fully, not covered over
- 12-month guarantee on every job
- 180+ five-star Google reviews
Read our cost guide or our reviews.
What the job involves on each surface
Stone surrounds
Sand mastic sits naturally against stone. The finish blends with the masonry.
Tenement and terrace windows
Windows above ground floor need the right access. Tell us the height and we’ll confirm what’s needed.
What else we do in Blackgang
How we quote for sand mastic
Your quote is based on your job. We take into account:
- Access and height
- The amount of work
- Any working-time requirements on site
- The product the joint needs
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs, plus any working-time requirements on site. Call for a quick quote and we will explain what it covers.
What we need to know
To help us quote quickly, let us know:
- Whether it has been sealed before
- Photos by email, if that’s easy
- Roughly how big the job is
- The address or postcode of the job
Getting a quote is simple: let us know what needs doing and where, and roughly how big it is. Photos by email help us understand the job, and we’ll take it from there.
Questions from Blackgang
Can you do sand mastic in Blackgang?
Yes, Blackgang is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or drop us an email and let us know what needs doing.
Do you cover smaller places like Blackgang?
Yes. Blackgang is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Will it make a mess?
No. We protect the surfaces around the joints, and we clear up the old sealant and our materials before we leave.
How long does sand mastic take to go off?
It forms a skin fairly soon, then hardens over a longer period. The weather and joint depth both affect it.
Should I check with the council before work on a listed or conservation-area home?
Speak to your local planning authority before work starts. Like-for-like sand mastic is often the preferred finish but the decision is theirs.
Can I add another job to the visit?
Of course. Doing several areas at once is generally more efficient.
I rent my home. Can I book you?
Yes, but check with your landlord or agent first. Many landlords are glad to have it sorted.
Which is right for my windows, sand mastic or modern sealant?
That depends on your windows. Period windows in stone or brick usually suit sand mastic and newer frames generally get a flexible sealant.
When something else is needed
Sealant isn’t the answer to every problem, and we’ll tell you before work begins. It will not solve:
- Decisions on consent for listed homes
- Broken panes
- Decayed frames that need repair
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly.
What we seal
- Stone surrounds
- Tenement windows
- Brick reveals
- Sash and case windows
- Period & listed homes
- Timber door frames