Isle of Wight · England
Window & door mastic in Great Thorness, Isle of Wight
Window mastic for Great Thorness and the surrounding area: careful preparation, the right product and tidy work. Call for a quick quote.
- Cracked sealant at the sill ends
- Cracked internal joints between frame and plaster
- Mastic that is falling out in pieces
How we handle window mastic in Great Thorness
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We’re ARBOMaster approved and fully insured, and we give a 12-month guarantee on the work. If you have a bead that doesn’t match the frame and damp patches on the reveal after heavy rain, we can help, whatever the surface.
Mastic can only go onto a dry, clean joint, so window work in Great Thorness is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
All our work is covered by our 12-month guarantee.
- Location
- Great Thorness (PO31)
- Region
- Isle of Wight
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
When something else is needed
A few problems are outside what sealant work can do:
- Damp problems in the wall away from the window
- Worn gaskets, brush seals or a door that has dropped
- A failed sealed unit that has misted up
If you are not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer.
What we seal
- Timber windows & doors
- Patio & French doors
- Window sills
- Aluminium frames
- uPVC windows
- Composite doors
The process
Our applicators work methodically: protect, prepare, seal, tidy. For most jobs that takes a few hours for a handful of frames, longer for a whole house, and the area is left clean. In a small place like Great Thorness, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check each frame and agree which ones need doing.
- Next the failed sealant is cut away and the joint cleaned.
- Where gaps are deep, backing rod goes in first.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- We clear up and check every joint is fully closed.
Preparing for the visit
- Mention any parking rules near the property
- Tell us about access, such as stairs, a lift or high-level joints
- Clear the area around the work
Getting a quote
If you’re in Great Thorness and need window mastic, phone 0345 464 0079 or send us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Advice
For landlords and businesses
Letting agents and landlords in Great Thorness can book us as well as householders. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
If you manage several properties in or around Great Thorness, several properties can go on one quote. Just tell us the addresses and what each one needs, and pictures by email help.
Can I do it myself?
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
Why deal with it now?
Redecorating is a good moment to renew the mastic. A clean new bead makes new paint or render look finished. Where a wall is exposed, as many are in small places like Great Thorness, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
What it costs depends on the size of the job, how much old material has to come out and how easy the joints are to reach. You will have a clear quote before any work starts, so you know where you stand.
What you get with us
- We’re fully insured
- 20+ years of sealant experience
- 180+ five-star Google reviews
- Sanitary silicone with an anti-fungal additive in wet areas
Read our cost guide or what customers say.
Aftercare tips
How long the joints last depends on use and care. We suggest:
- Make sure the drainage slots are not blocked
- Keep solvents and bleach off the sealant
- Wipe condensation off the frames
- Paint up to the joint, not over it
Keep the new mastic undisturbed while it cures, for as long as we advise. Keep jet washers away from the frames.
Draughts get worse, not better. As old mastic keeps shrinking, the gap widens, and a cold room gets colder. A new joint closes it up.
Windows and doors in Great Thorness
Great Thorness 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 is hard on the mastic around window and door frames, especially on the side facing the sea. Historic houses like Swainston Manor (about 3 miles south) are a reminder that the area around Great Thorness 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.
Swainston Manor, about 3 miles south, is one of the historic houses in the wider area around Great Thorness, and older homes nearby need a sealant that suits their walls.
Great Thorness is about 3 miles south-west of Cowes, in the Isle of Wight. Homes, rented property, offices and hotels in Great Thorness is covered for window mastic, old or new, large or small. The work is guaranteed for a year. Our the Isle of Wight coverage runs to 125 places, and Great Thorness is one of them. Our Southampton page covers work nearby.
Our applicators cover all of PO31 for window mastic and the streets around it. Neighbouring places we cover for window mastic include Porchfield (1 mile south-west), Locksgreen (1 mile south-west), Rew Street (2 miles north-east), Newtown (2 miles south-west) and Northwood (2 miles north-east). Further out, we also cover Newport (3 miles south-east), Ryde (9 miles east), Cowes (3 miles north-east), Sandown (10 miles south-east), Shanklin (10 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 phone 0345 464 0079 or send us an email.
Near you in Great Thorness
Around Great Thorness, our work takes us to homes and buildings near Sportsman's Rest pub and the streets around them. A little further out are Carisbrooke Castle (3.5 miles south-east) and St Mary's Hospital (2.8 miles south-east). Green spaces nearby include Mill Hill.
Signs you need window mastic in Great Thorness
Older frames were often sealed with products that set hard. Once it has hardened, the frame’s movement tears it from the wall, and a gap opens along one edge.
The most common problems we see are:
- Whistling draughts around closed windows
- Water coming in at the bottom corners of a door
- Gaps between the frame and the inside reveal
- Rushed sealant from a window installation
In and around Great Thorness, as anywhere, good window mastic starts with a clean, dry, properly prepared joint.
Questions to ask before you book
- Whether the sealant suits the joint
- What happens if the job turns out different
- What the quote includes, VAT included or not
- The length of the guarantee
Great Thorness: your questions answered
Is Great Thorness in your area for window mastic?
Yes, Great Thorness is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or email us and tell us what needs doing, and we will send you a clear quote.
Does living near the coast affect window mastic in Great Thorness?
Coastal homes put outside sealant through more weather than inland ones, so the choice of sealant and the preparation matter even more. Walls facing the sea are normally the first to need attention.
Do you work for landlords and businesses?
Yes. As well as householders, we work for landlords, agents, businesses and hotels across the Isle of Wight.
Does the work come with a guarantee?
Yes, for 12 months. Keeping drainage clear and checking the joints yearly helps them last.
Will there be a smell?
There can be a smell while the sealant cures, but it fades. Opening a window helps.
Are you insured?
Yes. We’re fully insured, and we can confirm the details when we quote.
When is the sealant fully cured?
Most sealants are touch-dry well before they’re fully cured. We will give you the cure time for the product we used before we leave.
Where are you based?
Mr Mastic is based in Crawley. Our applicators cover Great Thorness.