Isle of Wight · England
Sand mastic for sash & case windows in Thorley, Isle of Wight
Window and door surrounds in Thorley need attention? We cut out the old, prepare the joints and apply the right sealant, with a 12-month guarantee.
- Modern sealant on a period surround
- Mastic that needs renewing before redecorating
- Gaps where the frame meets the masonry
How we handle sand mastic in Thorley
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s made from sand and a linseed-oil-based binder, applied by hand. On older homes, it suits the building far better than silicone. We work on timber door frames, brick reveals and sash and case windows, and common reasons people get in touch are cement or filler used on old window joints that has cracked and modern sealant on a period surround.
In a village or hamlet like Thorley, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these do not always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
There’s a 12-month guarantee on every job, large or small.
- Place
- Thorley (PO41)
- Region
- Isle of Wight
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What sand mastic looks like in Thorley
Thorley is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That is hard on the mastic around older windows and doors, especially on the side facing the sea. With historic houses such as Mottistone Manor (about 3.7 miles south-east) nearby, there’s older building stock in the area around Thorley as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
Homes close to St. Swithin's Church include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Thorley is about 5 miles south-east of Lymington, in the Isle of Wight. Anywhere in PO41, we cover sand mastic for homes and businesses. Across the Isle of Wight, we cover 125 places, Thorley among them. You can also see our page for Southampton, roughly 16 miles from Thorley.
All of PO41 is within our area for sand mastic. Neighbouring places we cover for sand mastic include Thorley Street (1 mile east), Wellow (1 mile south-east), Ningwood (2 miles east), Shalcombe (2 miles south-east) and Newbridge (2 miles east). We also work in nearby towns such as Newport (8 miles east), Ryde (14 miles east), Cowes (8 miles north-east), Sandown (14 miles east), Shanklin (14 miles east) and Ventnor (13 miles south-east). If you are somewhere remote, a little more planning is needed, so mention it when you ask for a quote.
Near you in Thorley
For rail, the closest station is Lymington Pier station, roughly 4.9 miles north-west. A little further out are Yarmouth Castle (1.4 miles north-west) and Ferguson Family Museum (1.7 miles west). Green spaces nearby include Lymington and Keyhaven Marshes Nature Reserve and Compton Down.
Common questions in Thorley
Is sand mastic in a coastal place like Thorley any different?
Coastal homes put outside sealant through more weather than inland ones, so preparation and the right sealant matter all the more. Walls facing the sea are usually the first to need attention.
Will you come out to Thorley?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can you seal over the old sealant?
No, it will not last. It may look fine at first, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
Can sand mastic be painted?
The usual advice is to leave sand mastic unpainted. If you’re redecorating the window, ask us first and we will talk you through it.
Do the sealants smell?
It depends on the product. Some smell for a while, some hardly at all.
How do I get a quote for sand mastic in Thorley?
Size, access and the old material all affect the cost. Call for a quick quote.
Can tenants book the work?
We are happy to deal with the tenant, landlord or agent. Get your landlord’s agreement first.
Do you do commercial work?
Yes. Hotels, offices and other businesses use us, and we are fully insured.
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Leave the new mastic unpainted
- Avoid heavy scraping on the mastic joint
- Ask a joiner to look at soft timber first
- Find out about consent before window work on a listed home
Keep paint scrapers and sanders off the mastic when redecorating. Hard scraping can loosen it.
It’s best to renew mastic before painting the windows. Paint over cracked mastic only covers it up.
Why it’s worth doing now in Thorley
Not every draught comes from the sashes themselves. Open mastic joints round the box can let air in, and renewing the mastic closes them. Where a wall is exposed, as many are in small places like Thorley, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we’ll explain what it covers.
Why Thorley clients choose us
- Old sealant always removed completely
- Over 20 years’ experience
- Experience in homes, commercial sites and hotels
- 180+ five-star Google reviews
Read what affects the cost and customer reviews.
Can I do it myself?
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
A DIY attempt does not rule out a professional job. We cut it out and start again.
Also in Thorley
Signs you need sand mastic in Thorley
Sand mastic slowly weathers. It dries out, cracks and loses its grip on the stone or timber.
Any of these means the joints need attention:
- Draughts and rain around sash boxes
- Gaps round a timber door in stone or brick
- Window mastic to renew ahead of painting
- Failed mastic on an exposed elevation
Letting a property close to Lymington Pier station? Then any sash windows need sound mastic to keep draughts and rain out.
Questions to ask before booking
- Who turns up on the day
- Whether all the old sealant comes out first
- How the joint is cleaned and prepared
- Whether you can choose the colour
Quotes for sand mastic in Thorley
Call for a quick quote. What matters most is:
- How many rooms, windows or areas are involved
- The type of sealant required
- Whether there’s mould to deal with
- The number and length of the joints
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all play a part, and we will explain the quote if you ask.
What to tell us for a quote
Before you ask for a quote, have a think about:
- Roughly how big the job is
- Access, such as stairs, a lift or height
- The address or postcode of the job
- The problem you’ve noticed
For a quote, phone 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We will send you a clear quote before any work starts.
What happens on the day
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 per window, depending on the condition of the joints. Somewhere as small as Thorley, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic is not too thick.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
How to prepare
- On commercial sites, let us know about site rules
- Keep children and pets away from the work area
- Try not to wet indoor joints just before the visit
Get a quote
For sand mastic in Thorley, phone 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before we start.
Advice
When it is not the sealant
We’d rather tell you now than do work that won’t last, so here’s what sealant can’t put right:
- Timber that has rotted
- Masonry that needs repairing
- Cracked or broken glass
If you are not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer before booking.
Joints and surfaces we work on
- Timber door frames
- Sash and case windows
- Tenement windows
- Stone surrounds
- Brick reveals
- Period & listed homes