Isle of Wight · England
Window Mastic in Blackgang
Our applicators work in Blackgang on mastic around window and door frames, sills and patio doors. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Cracked internal joints between frame and plaster
- Rain getting in at the frame or under the sill
- Cold air getting in at the frame edge
What sealant work cannot fix
New sealant can’t fix everything, and we’d rather say so up front. Sealant will not put right:
- Condensation trapped between the panes
- A sash or casement that will not close properly
- A door that needs adjusting, rehanging or new seals
If you’re not sure, just call 0345 464 0079 or send us an email and we’ll give you a straight answer.
What we seal
- Timber windows & doors
- Composite doors
- uPVC windows
- Patio & French doors
- Aluminium frames
- Window sills
How we handle window mastic in Blackgang
If you can feel air around a shut window, the gap is often at the frame. Resealing that joint can make a room feel noticeably less draughty and quietens the whistle on windy days. If the draught is through the window seals instead, we’ll tell you. We’re often asked to deal with gaps between the frame and the inside reveal and draughts coming in around windows and doors, across uPVC windows, patio & French doors and window sills.
Mastic can only go onto a dry, clean joint, so window work in Blackgang is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
You are covered for a year from the day we finish. If anything is not right with it, phone 0345 464 0079 or send us an email.
- Location
- Blackgang (PO38)
- Region
- Isle of Wight
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
DIY sealant or a professional job?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly.
How the job changes by surface
Patio & French doors
Patio and French doors have the longest joints on most houses. Most leaks start at the bottom corners, so they get particular care.
Composite doors
An exposed front door gets wind-driven rain. We pay most attention there.
Blackgang homes and the weather
Blackgang is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on the mastic around window and door frames, which can dry out and crack sooner where a building faces the weather. With historic houses such as Wolverton Manor (about 4.1 miles north-west) nearby, there’s older building stock in the area around Blackgang 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 Andrew's Church include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Blackgang is about 6 miles south-west of Shanklin, in the Isle of Wight. Our applicators cover window mastic for homeowners, landlords and businesses in Blackgang and the surrounding area, as part of our work across the Isle of Wight. We cover 125 towns and villages across the Isle of Wight, large and small. Our Portsmouth page covers work nearby (18 miles or so).
Every address in PO38 is covered for window mastic. We also 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). Further out, we also cover 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). For island and remote addresses, a little more planning is needed.
What’s near Blackgang
A little further out are Blackgang Sawmill Museum (less than half a mile west) and Whitecroft Hospital (5.7 miles north). Green spaces nearby include Stenbury Down.
How to look after the new joints
To keep the joints looking good and working properly:
- Clear any debris from frame drain holes
- Clean frames with a soft cloth and soapy water
- Do not paint over the silicone
- Check the mastic once a year
Check the drainage slots in the frames aren’t blocked, so water can run away instead of sitting against the joint.
Water gets in quietly when mastic fails. You might not see it until plaster blows or a damp patch appears inside. Catching it early keeps the fix to a reseal.
More services for Blackgang
What affects the cost of window mastic
Every job gets its own quote. These are the things that affect it:
- The type of sealant required
- The amount of work
- The old material and how stubborn it is
- How easy the joints are to reach
The cost depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before we start, so you know where you stand.
What we need to know
Before you ask for a quote, have a think about:
- Where the property is
- Any previous sealing or DIY work
- Pictures of the joints, sent by email
- The rough size of the job
Getting a quote is simple: let us know what needs doing and where, and roughly how big it is. A few photos by email make the job easier to understand.
The process
A visit follows a simple pattern: we look at the joints together, mask and protect the surrounding surfaces, carry out the job and clear up. It generally takes most of a day for a typical house, less for a few frames. Somewhere as small as Blackgang, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First we look at every frame and agree the list.
- Next the failed sealant is cut away and the joint cleaned.
- We fit backing rod in deep gaps so the sealant is the right depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- Finally we tidy up and check each joint.
Preparing for the visit
- Mention any parking rules near the property
- Keep children and pets away from the work area
- Tell us about any previous sealing or DIY attempts
Getting a quote
Need a quote? Please call 0345 464 0079 or send us an email and tell us about the job. We’ll explain what we’d do and send you a clear quote before we start.
Read more
Signs you need window mastic in Blackgang
Sun, frost and rain wear sealant out. UV light hardens the outside of the bead, and over the years it loses its give, cracks and comes away.
Signs it’s time to call us include:
- Rushed sealant from a window installation
- Mastic that’s falling out in pieces
- Rain getting in at the frame or under the sill
- Leaking joints at the ends of sills
For site and facilities teams at buildings such as Niton Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
Comparing quotes
- How long the guarantee is
- What preparation is included
- Whether VAT is included
- Who turns up on the day
Blackgang questions
Is Blackgang within the area you cover?
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.
Do you cover Blackgang for window mastic?
Yes, Blackgang is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or email us and let us know what needs doing, and we will send you a clear quote.
Is the work guaranteed?
Yes. Each job is covered for 12 months.
Can you do several jobs on one visit?
Yes. Just list everything you need and we will quote it together.
Can new sealant go over the old?
No, and we never do. It can look neat for a few weeks, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
Do you work for landlords and businesses?
Yes, regularly. Several properties can go on one quote, and between tenancies is a good time for the work.
Can you get sealant to suit coloured frames?
Yes, in most cases. Tell us the frame colour when you get in touch and we will match it as closely as we can.
Is it worth trying it myself?
It depends on the job. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.