Isle of Wight · England
Sand mastic for sash & case windows in Gatcombe, Isle of Wight
Sand mastic in Gatcombe from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Mastic round period door frames that has failed
- Cement or filler used on old window joints that has cracked
- Failed mastic on an exposed elevation
About our sand mastic in Gatcombe
We renew sand mastic around sash windows and doors set in stone or brick. Out comes the old, loose mastic, the joint is prepared and new mastic is shaped by hand. If you are dealing with mastic round period door frames that has failed and open joints round the window box, we can put it right, whatever the surface.
Outdoor sealant needs dry, clean surfaces, so work on frames around Gatcombe is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
A 12-month guarantee comes as standard.
- Location
- Gatcombe (PO30)
- Wider area
- Isle of Wight
- Cover
- One year on every job
- Quotes
- A clear price before work begins
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Aftercare tips
Aftercare is simple:
- Ask the planning authority about consent for listed or conservation-area homes
- Look over the window mastic once a year
- Ask a joiner to look at soft timber first
- Avoid patching sand mastic with silicone
When preparing windows for paint, take care around the mastic. Hard scraping can loosen it.
Small cracks are a sign the mastic is ageing. It’s easier to renew it before it drops out.
What happens on the day
A visit follows a simple pattern: we check the joints, protect the area around them, do the work and tidy away. It usually takes a few hours for a single window, longer for several. Somewhere as small as Gatcombe, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
Getting ready for the visit
- Plan for the work area to be out of bounds to pets and children
- Clear the area around the work
- For indoor joints, keep the area dry beforehand if you can
Getting a quote
To get a quote, ring 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. We’ll send you a clear quote before any work starts.
Advice
Towns and villages near Gatcombe
What else we do in Gatcombe
Windows and doors in Gatcombe
Historic houses like Gatcombe House (about 0.2 miles south-east) are a reminder that the area around Gatcombe 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’s traditional sand mastic. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Schools such as Chillerton and Rookley Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Gatcombe is about 2 miles south of Newport, in the Isle of Wight. Our applicators cover sand mastic for homes and businesses in Gatcombe and nearby, as part of our work across the Isle of Wight. Gatcombe is one of 125 places in the Isle of Wight we cover for sand mastic. Portsmouth is on our list too, about 14 miles from Gatcombe.
Postcode districts we cover here for sand mastic: PO30. Streets in the area include Gatcombe Road, Rectory Lane and Newbarn Lane, all of which we cover. Nearby, we also carry out sand mastic in Chillerton (1 mile south), Plaish (2 miles north-west), Clatterford (2 miles north), Bowcombe (2 miles north-west) and Carisbrooke (2 miles north). Larger places within reach include Ryde (8 miles north-east), Cowes (6 miles north), Sandown (6 miles east), Shanklin (6 miles east), Ventnor (6 miles south-east) and East Cowes (6 miles north). If you’re somewhere remote, a little more planning is needed.
What’s near Gatcombe
Around Gatcombe, our work takes us to homes and buildings near Christ The King College. Well-known places in the area include Carisbrooke Castle (1.6 miles north) and Isle of Wight Music Museum (2.5 miles north). For a walk, there’s Briddlesford Nature Reserve and Brighstone Down.
DIY sealant or a professional job?
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
Different surfaces, different methods
Brick reveals
Gaps between frame and brick let in rain and draughts. New mastic seals the gap.
Period and listed homes
Many older homes were built with sand mastic round the windows. On listed buildings, check with your planning authority first.
For landlords and businesses
If you manage several properties in or around Gatcombe, jobs at different addresses can go on one quote. Send us the addresses and the work at each.
Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
Signs you need sand mastic in Gatcombe
Water gets into small cracks in the mastic and loosens it further. Exposed elevations usually fail first.
Any of these means the joints need attention:
- Window mastic to renew ahead of painting
- Gaps round a timber door in stone or brick
- Gaps where the frame meets the masonry
- Draughts and rain around sash boxes
If you live in an older home near St. Olave's 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
- Whether VAT is included
- Is the old sealant removed completely?
- Are they insured?
- The length of the guarantee
How we quote for sand mastic
The price is agreed before any work begins. It takes into account:
- Any mould that needs treating
- The old material and how stubborn it is
- Working hours on commercial sites
- How much there is to do
A failed joint rarely gets cheaper to fix by waiting. If you are not sure whether it needs doing, ring 0345 464 0079 or send us an email for an honest opinion and a quote.
What we need to know
Photos help, but a description is a good start. Please mention:
- If someone has resealed it before
- Photos by email, if that is easy
- Where the job is, and your postcode
- Roughly how big the job is
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. When it suits you, phone 0345 464 0079 or send us an email.
Gatcombe questions
Do you cover smaller places like Gatcombe?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
What guarantee comes with sand mastic in Gatcombe?
Every job comes with our 12-month guarantee, wherever it is. We’re also fully insured and ARBOMaster approved.
Can old silicone round a sash window be swapped for sand mastic?
Yes. The silicone is cut out and the joint cleaned before the sand mastic goes in.
What’s sand mastic made of?
Sand mastic is a traditional material for pointing round windows and doors. It combines sand with a linseed-oil-based binder.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator.
Where do you work from?
Our base is Crawley. Our area covers South East England, London and Scotland.
Should I try DIY first?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Is it OK to seal over old sealant?
No. Fresh sealant doesn’t stick to old sealant, and it traps any mould or water underneath. We remove it all first.