Isle of Wight · England
Sand mastic for sash & case windows in Newtown, Isle of Wight
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for householders, landlords and businesses in Newtown. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Silicone on a period window that looks wrong
- Mastic that needs renewing before redecorating
- Cement or filler used on old window joints that has cracked
How we handle sand mastic in Newtown
Silicone on a period window often looks wrong and isn’t always the right material. Sand mastic is the traditional choice, and we can replace one with the other. We work on sash and case windows, brick reveals and tenement windows, and people most often call us about modern sealant on a period surround and gaps round a timber door in stone or brick.
Homes in small places like Newtown often stand in the open, with little to shelter their windows from wind and rain. Exposed frames and sills lose their mastic sooner than sheltered ones.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we’ll put it right.
- Place
- Newtown (PO30)
- Region
- Isle of Wight
- Cover
- A year, on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What the job involves on each surface
Timber door frames
Doors face weather and wear, so their mastic can fail sooner. We rake it out and renew it.
Period and listed homes
Materials matter on listed and conservation-area homes. Like-for-like sand mastic is usually favoured.
DIY sealant or a professional job?
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly.
A careful DIYer can reseal a simple joint, 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.
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Ask a joiner to look at soft timber first
- Take care around the mastic when scraping paint
- Ask us before painting near the mastic
- Ask the planning authority about consent for listed or conservation-area homes
Check the mastic when you check the paintwork. Small cracks are easier to deal with early.
It’s best to renew mastic before painting the windows. Paint over cracked mastic only covers it up.
Newtown homes and the weather
Newtown is within about 1 mile of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Around Newtown, as everywhere, sand mastic is only as good as the preparation behind it.
Newtown is about 4 miles west of Newport, in the Isle of Wight. Our applicators cover sand mastic for householders, landlords and businesses in Newtown, as part of our work across the Isle of Wight. 125 places in the Isle of Wight are on our list, from the larger towns to small villages. Our Southampton page covers work nearby, about 14 miles away.
Work in PO30 works the same way as everywhere else we cover. We also cover the places around Newtown: Locksgreen (1 mile east), Porchfield (1 mile north-east), Great Thorness (2 miles north-east), Forest Side (3 miles east) and Rew Street (4 miles north-east). Larger places within reach include Newport (4 miles east), Ryde (10 miles east), Cowes (5 miles north-east), Sandown (11 miles east), Shanklin (11 miles south-east) and Ventnor (11 miles south-east). Island and remote addresses take a little more planning, so please mention your location when you ring 0345 464 0079 or email us.
Landmarks near Newtown
A little further out are St Mary's Hospital (4 miles east) and Carisbrooke Castle (3.7 miles south-east). For a walk, there’s Brighstone Down.
What affects the quote in Newtown
Every job gets its own quote. These are the things that affect it:
- The number and length of the joints
- The type of sealant required
- Working hours on commercial sites
- Any mould that needs treating
Combining jobs into one visit generally makes better use of the time than several visits. We will send you a clear quote for the lot.
What to tell us for a quote
You don’t need to know the technical terms. Just tell us:
- A few photos by email, if you can
- The problem you’ve noticed
- The type of property
- Any previous sealing or DIY work
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and add pictures by email if you can.
How it works
When we get to you, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. Most jobs then take a few hours for a single window, longer for several. For a village or hamlet like Newtown, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- First we agree which joints need doing.
- We remove the old, loose mastic.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
How to prepare
- On commercial sites, let us know about site rules
- Try not to wet indoor joints just before the visit
- Mention any leaks or damp you’ve noticed
Getting a quote
Need a quote? Please phone 0345 464 0079 or email us and tell us about the job. We’ll explain what we’d do and send you a clear quote before work begins.
Related advice
Other services in Newtown
Common questions in Newtown
Do you cover smaller places like Newtown?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Can you do sand mastic in Newtown?
Yes. We work across London and the South East, and Newtown is part of that. You can ring 0345 464 0079 or email us and let us know what needs doing, and we’ll give you a clear quote.
Do you have insurance?
Yes. Mr Mastic is fully insured, and we’ve been doing sealant work for more than 20 years.
How do I get a quote for sand mastic in Newtown?
Size, access and the old material all affect the cost. Ask us for a quote and we will talk you through it.
What do you put in the joint?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We will tell you what we’re using and why.
When will the new mastic be hard?
It skins over fairly quickly but takes longer to harden fully. We’ll explain what to expect before we leave.
Will it make a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
What do you need from me for a quote?
A short description and the location. We will ask anything else we need to know.
Do you need sand mastic in Newtown?
Rain on the window surround works into any crack and loosens it further. Windows facing the weather tend to go first.
Look out for these signs:
- Gaps round a timber door in stone or brick
- Old cement repairs round a window that have failed
- Wind and rain getting in round a sash window
- Gaps where the frame meets the masonry
If you live in an older home near Holy Spirit Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
What to look for in a quote
- When the joint can take water or movement
- Is the old sealant removed completely?
- What product goes in the joint
- How the colour is chosen
Why deal with it now?
An open joint round the frame lets weather in. Water can get to the frame and the masonry, so dealing with it now protects both. In a small place like Newtown, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
The cost reflects the work involved, not guesswork. That is why we ask about the job first and send you a clear quote before work begins.
Why Newtown customers choose us
- Any old sealant cut out fully, not covered over
- Approved under the ARBOMaster scheme
- Anti-fungal sanitary silicone in wet areas
- Arbo and Everbuild products
Take a look at our cost guide and our reviews.