Portsmouth · England
Gutter Sealing in Southsea
Gutter and fascia joints in Southsea need attention? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Gaps along fascia and soffit joints
- Old sealant on roofline trims that has split
- Damp patches inside below a leaking gutter
When to call us in Southsea
Gutter joints rely on seals that age. Sun and cold make the gutter expand and contract, and old seals crack or slip.
Most people get in touch when they notice one of these:
- Earlier gutter repairs that have peeled off
- Streaks down the brickwork from a leaking joint
- Fascia boards with gaps between them
- Internal damp traced to a gutter joint
If you look after a building such as Craneswater Junior School, its movement joints, gutters and trims need looking after like any other building’s.
Before you book anyone
- Is VAT in the price?
- How the joint is cleaned and prepared
- Who turns up on the day
- Which colour the sealant will be
How we handle gutter sealing in Southsea
Across Southsea, we reseal gutter joints, end caps and roofline trims. Low-level work is straightforward, and for higher work, tell us about access and we’ll confirm what’s needed. Typical jobs include gaps along fascia and soffit joints and stop ends leaking at the end of a run, on garage door frames, gutter joints and roofline trims.
Around Southsea, outside jobs take in garage door frames, porches, gutters and trims as well as walls. Each joint between different materials moves in its own way, so the sealant has to cope with that.
All our work comes with a 12-month guarantee, wherever you are in Portsmouth.
- Where
- Southsea (PO5, PO4, PO1)
- Wider area
- Portsmouth
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
DIY versus a professional finish
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Quotes for gutter sealing in Southsea
We quote each job individually. This is what makes a difference:
- The type of sealant required
- Whether the work is at height
- When we can work, for business premises
- The number and length of the joints
What you pay reflects the work, not guesswork. That is why we ask a few questions first and give you a clear quote before we start.
Helping us quote
What to tell us when you ask for a quote:
- Access, such as stairs, a lift or height
- A few pictures by email, if you can
- The rough size of the job
- What the problem is, such as mould, gaps, leaks or cracking
It all starts with a short chat. Describe the problem, the location and the size of the job. Whenever you’re ready, ring 0345 464 0079 or send us an email.
How it works
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, carry out the job and clear up. Most jobs take an hour or two for a few joints, longer for a full run. Parking in a town like Southsea is normally straightforward, but tell us if there’s a driveway or any restrictions, and let us know if the work is upstairs, in a flat or up high outside.
- We look at where the water is coming from and check the gutter is not broken or sagging.
- We clean out the joint and take out the old sealant.
- We make sure the joint is dry before sealing.
- An exterior or gutter sealant is applied to the joint.
- We check the run and clear any debris we find while we are there.
How to prepare
- On commercial sites, let us know about site rules
- Let us know about stairs, lifts or work at height
- For indoor joints, keep the area dry beforehand if you can
Ask for a quote
Asking for a quote is easy: let us know the job and the location. A few pictures by email make the job easier to understand.
Read more
FAQs for Southsea
Do you cover Southsea for gutter sealing?
Yes. Our work covers London and the South East, and Southsea is part of that. Just call 0345 464 0079 or email us with a few details of the job.
Does living near the coast affect gutter sealing in Southsea?
Near the sea, outside joints face more wind, rain and salt than they would inland, so preparation and the right sealant matter all the more. Walls facing the sea are usually the first to need attention.
Is the work guaranteed?
There’s a 12-month guarantee on every job.
Do you have insurance?
Yes, we are fully insured.
Should I try DIY first?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs.
Do you hold any approvals?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
Where do you work from?
Our base is in Crawley, and we cover South East England, London and all of Scotland.
When is the sealant fully cured?
Many sealants skin over quickly but take longer to cure fully. We will give you the cure time for the product we used.
Places near Southsea
What else we do in Southsea
Surface by surface
uPVC fascias
Open fascia joints look untidy and can let water in. Sealing them closes the gap.
Roofline trims
Trims along the roofline are often finished with sealant. Split sealant lets water in.
Landlord and commercial work in Southsea
We also work for property managers and facilities teams. We can quote a run of properties together, and we are fully insured for the work.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
What gutter sealing looks like in Southsea
Southsea is within about 1 mile of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on gutter, fascia and roofline joints, which can dry out and crack sooner where a building faces the weather. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Homes close to St Margaret of Scotland include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant. For landlords with property near Fratton station, a dripping gutter joint or loose fascia trim is easy to miss until damp shows inside.
Southsea is about 2 miles south of Portsmouth, in Portsmouth. Whether you’re in the middle of Southsea or further out, we cover gutter sealing for every kind of property, from flats and houses to offices and hotels. Our Portsmouth coverage runs to 19 places, Southsea among them.
Work in PO5, PO4 and PO1 works the same way as everywhere else we cover. That includes homes and businesses on Bath Road, Liss Road and Beach Road. Other places close to Southsea include Milton (1 mile north-east), Fratton (1 mile north), Kingston (1 mile north), Landport (1 mile north-west) and Baffins (2 miles north). Larger places within reach include Hilsea (3 miles north), Wymering (4 miles north), Paulsgrove (5 miles north), Cosham (4 miles north), Drayton (4 miles north) and Farlington (5 miles north).
Near you in Southsea
Typical jobs here are in homes near The Festing pub, St Edmund's Catholic School and Mayville High School. Southsea’s nearest station is Fratton station, roughly 0.8 miles north. Well-known places in the area include St. Mary's Hospital (1 mile north) and Southsea Castle (1 mile south-west). The countryside around Southsea includes Milton Locks.
Why act early in Southsea
A dripping stop end can soak the wall right through the wet months. It’s a small job to put right compared with treating damp later. In Southsea, as anywhere, most leaks start as a small gap in a joint, and they’re far easier to fix early.
Every job is a little different, so we quote each one individually. Size, access and the product the joint needs all make a difference.
Why choose Mr Mastic in Southsea
- We never seal over old sealant
- Anti-fungal silicone where joints get wet
- A 12-month guarantee on all work
- Colour agreed with you before any work starts