Portsmouth · England
Glazing & conservatory sealant in Cosham, Portsmouth
Glazing joints in Cosham need attention? We remove the old material, prepare the joints and seal them properly.
- Water tracking down the inner face of the glass
- Silicone pulling away from the glass
- Shower screens leaking along the wall or tray
Glazing silicone in Cosham
Glazing silicone is a maintenance item. Sun, rain and movement wear it down, and once it cracks, water follows. Renewing it keeps glazing joints doing their job. We are often asked to deal with mouldy sealant around glass panels and leaks where conservatory glass meets the frame, across glass-to-frame joints, rooflights and conservatory frames.
In a smaller place like Cosham, some walls face open ground and catch the full force of the weather, so exposed windows and doors face the weather head on. The mastic around frames on those walls tends to age faster.
All of our work is guaranteed for twelve months.
- Place
- Cosham (PO6, PO3, PO2)
- Wider area
- Portsmouth
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Common problems we fix in Cosham
Heat and cold make glass and frames move, and they don’t move by the same amount. In time, the sealant splits or pulls away.
Keep an eye out for these signs:
- Glazing silicone that has cracked or come away
- Failed sealant around rooflight glass
- Water escaping where a screen meets the wall
- Failed joints on frameless glass
If you live in an older home near Church of St Philip, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
What to look for in a quote
- The length of the guarantee
- How much experience the applicator has
- How the surfaces are prepared before sealing
- How the colour is chosen
DIY versus a professional finish
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Surface by surface
Glass-to-frame joints
Silicone at the glass edge seals it into the frame. When it splits, water can get into the frame.
Glass-to-glass joints
Where two panes meet, the silicone joint takes all the movement. It must be clean, neat and well bonded.
Cosham: your questions answered
Is glazing silicone in a coastal place like Cosham any different?
Near the sea, outside joints face more wind, rain and salt than they would inland, so the choice of sealant and the preparation matter even more. It’s worth checking the walls that face the sea first.
Will you come out to Cosham?
Yes. Cosham is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do the sealants smell?
It depends on the product. Some smell for a while, some hardly at all, and any smell fades as they cure.
How much does glazing silicone cost in Cosham?
It depends on the job, so we quote each one individually. For a quick quote, phone 0345 464 0079 or send us an email and tell us what needs doing and where.
Will you leave a mess?
We keep the work tidy. We protect what’s around the joints, and the area is left clean when we finish.
Do I have to be there?
It depends on the job. For work indoors, someone needs to let us in, and for outside work we will agree access with you when we book.
Are you fully insured?
Yes. We’re fully insured, and we’ve been doing sealant work for more than 20 years.
Is it worth trying it myself?
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.
When something else is needed
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- Rotten or badly damaged frames
- Glass that needs replacing
- Failed flashing around a conservatory
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly.
Surfaces we seal
- Glass-to-frame joints
- Glass balustrade bases
- Rooflights
- Conservatory frames
- Glass-to-glass joints
- Shower screens
How it works
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The job generally takes a few hours for most jobs, including the tidy-up. A visit to Cosham is planned like any other: the time, the access and where to park are agreed in advance. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- We find where water is getting in and check whether it’s a sealant joint.
- Old silicone is cut away from the glass and frame without scratching either.
- We clean the joint with a solvent that suits the glass and frame.
- We apply a neutral-cure glazing silicone and tool it smooth.
- The finished joints are checked and, where it’s safe, tested with water.
Getting ready for the visit
- Move anything stored near the joints
- Let us know about earlier repairs to the joints
- Tell us if parking is tricky
Getting a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Related advice
Glazing silicone in Cosham: local notes
Cosham 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 glazing joints and frame seals, especially on the side facing the sea. With historic houses such as Warblington Castle (about 4.4 miles east) nearby, there’s older building stock in the area around Cosham as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
Managing a site like Court Lane Junior Academy? Then its window and door frames need their mastic kept sound, just like a home’s. Letting a property close to Cosham station? Then glazing joints are worth checking at the end of a tenancy, before a small leak grows.
Cosham is about 2 miles south-west of Purbrook, in Portsmouth. Every kind of property in Cosham can book us for glazing silicone. The work is guaranteed for a year. Our Portsmouth coverage runs to 19 places, Cosham among them.
Here we cover the PO6, PO3 and PO2 postcode area for glazing silicone. Streets in the area include Dean Road, Park Lane and Elgin Road, all of which we cover. With the A397 close by, Cosham is easy for our applicators to reach for glazing silicone. We also cover Wymering (1 mile north-west), Hilsea (1 mile south), Drayton (1 mile east), Widley (1 mile north-east) and Paulsgrove (1 mile west). We also work in nearby towns such as Southsea (4 miles south), Milton (3 miles south), Landport (3 miles south), Portsea (3 miles south-west), Portsmouth Point (4 miles south-west) and Fratton (3 miles south).
Landmarks near Cosham
In Cosham, that means homes and buildings near The First Post pub, Alexandra Park and Springfield School, among other places. Cosham has its own railway station: Cosham station. A little further out are Tricorn Centre (2.9 miles south) and World War I Remembrance Centre (1 mile south-east). Not far away are Southmoor Nature Reserve and Portsdown Hill.
Places near Cosham
More services for Cosham
Work for landlords, hotels and businesses
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can go on one quote.
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Aftercare tips
Looking after new joints is easy:
- Check the gutters above the glazing for debris
- Get a new leak looked at quickly
- Stick to mild cleaners on glass
- Keep harsh solvents off the silicone
Squeegee a shower screen after each shower and let the room air. It helps stop mould getting into the silicone.
Damp patches, drips and condensation along a joint are worth checking. The cause may be sealant or another part and we will find out which.