Portsea mastic sealing
We carry out mastic sealing for building owners, managing agents and housing associations in Portsea and the surrounding area. Send photos or drawings for a fixed quote.
- The same joint failures repeated across a portfolio
- Damp patches beside frames
- Communal area joints that look neglected
Mastic sealing for businesses in Portsea
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
Leave it or put it right?
A bead run over old mastic can look like a repair. It won’t grip the old sealant and soon comes away. Full removal and proper preparation is what lasts. Small buildings around Portsea suffer from failed joints as much as large ones. Catching it early means a reseal rather than repairs.
What a job costs comes down to how many linear metres there are, what has to come out first and how the joints are reached. Call for a quote once you have the details.
Why us?
- Work carried out by CSCS-carded applicators
- Matching to RAL references, product permitting
- A Constructionline member, so easy to vet
- Work to your specification and the manufacturer’s guidance
Read how commercial sealant jobs are priced and how we’re accredited.
Mastic sealing in Portsea
Across Portsea and the rest of Portsmouth, we work the same way: you send details, we return a fixed quote, the joints are resealed and the 12-month guarantee follows. Addresses, photographs of typical joints and a rough idea of quantities let us give a quick quote, and site visits can be arranged. The enquiries we see most involve draughts at frames across a block and damaged joints in communal entrances and corridors, across external wall and movement joints, shopfronts below residential blocks and window and door perimeters on blocks. Whoever orders the work in Portsea, the brief is typically the same: a clear scope, tidy work and joints that don’t fail again.
Converted and older buildings in and around Portsea often put modern windows into old walls. Perimeter joints need a sealant that suits both frame and masonry.
A 12-month guarantee applies to all our work in Portsmouth. If an installation problem shows up, call the office on 01277 525 020 or email the details over and we will arrange a return visit.
- Where
- Portsea (PO1, PO12, PO5)
- Region
- Portsmouth
- Guarantee
- 12 months on every job
- Price
- Fixed quote, scope in writing
- Call
- 01277 525 020
- Last updated
- 3 November 2026
Diagnose, treat, sign off
Tell us your site hours and access windows and we’ll plan around them. On the day, the work area is kept contained and tidy, and your contact hears from us before we move to the next area. Work in places the size of Portsea is planned as a single visit where we can. Clear photos and measurements help us bring the right products.
- We inspect the joints, building by building, and record what has failed and why.
- A fixed quote follows, split by block or building if that suits you.
- Dates, areas and access are agreed so residents or tenants can be told in advance.
- Old sealant is stripped and each face prepared back to firm material.
- Backing rod and primer go in where the joint and the product need them, then new sealant is applied and tooled.
- Each building is checked on completion and the work carries our 12-month guarantee.
What we need from you
- Arrange parking or a loading space
- Tell us which areas need to stay in use
- Confirm the product named in the specification
Ask for a quote
Let us know the site, the scope and your timescale, and a fixed quote will follow. The easiest way is to phone 01277 525 020 or send photos by email.
Advice
When to call us in Portsea
Previous repairs often sealed new mastic over old. New sealant won’t grip failed sealant and the repair soon fails.
Most enquiries start with something like this:
- Damp patches beside frames
- Mastic failing across several blocks on an estate
- Open joints in brickwork or panels
- Worn sealant at communal door frames
Buildings close to stations like Portsmouth Harbour station (under half a mile south-west of Portsea) are often flats over shops, with frame mastic to keep sound.
Questions to ask before you book
- Can the work be phased to keep areas open?
- What level of public liability insurance do they hold?
- Whether their applicators hold CSCS cards
- How they handle RAMS and site documents
What we can’t put right
We check first that sealant really is the fix. It won’t put right:
- Old mastic suspected of containing asbestos, which must be tested and dealt with by a specialist first
- Substrate edges that need repairing first
- Leaks through the frame itself rather than the perimeter
If you are not sure, just speak to us on 01277 525 020 or email us and we’ll give you a straight answer.
Joints and surfaces we work on
- Window and door perimeters on blocks
- Balcony and threshold joints
- Shopfronts below residential blocks
- Communal entrances and stairwells
- Communal kitchens and washrooms
- External wall and movement joints
Also near Portsea
What else we do in Portsea
Aftercare for building managers
Keep the joints in good shape with a few simple steps:
- Plan resealing building by building rather than complaint by complaint
- Check the asbestos register before any old mastic is disturbed
- Make mastic part of routine maintenance checks
- Start inspections with the most exposed faces
If paintable sealant was used, decoration can follow once it has cured. Silicone typically can’t be painted, so keep decorators off it unless told otherwise.
Leaks at window perimeters spoil finishes and can affect frames. Resealing early keeps the job small.
What affects the price in Portsea
These are the things that shape the price:
- Distance, for remote addresses
- The size and state of each joint
- Quantities, in metres or numbers
- Induction, permit and paperwork requirements
Every site prices differently: joint size, product, access and site hours all play a part. A fixed quote follows once we understand the job.
Sending details for a quote
We can often quote from photos and a few details. Please tell us:
- The asbestos register, for older buildings
- Drawings or a marked-up plan, if available
- The product your specification calls for
- Where the site is, with the postcode
Pricing a project or setting a maintenance budget? Send the scope and any drawings, and we will return a fixed quote that you can work with. For a chat about it beforehand, call 01277 525 020 or send details through our quote form.
Planned mastic for Portsea portfolios
The sea is no more than about 1 mile from Portsea. For owners and agents with buildings near the sea, exposed elevations are where frame mastic fails first, and they deserve more regular inspection. There are eight care or nursing homes within about 2 miles of Portsea. Frame mastic on care buildings is best renewed elevation by elevation, with the manager deciding timings.
If you manage student housing near a university such as University of Portsmouth - North Zone, less than half a mile to the east of Portsea, the summer turnaround is the time for mastic. If you are responsible for a building such as St Ann's Church, frame and door mastic needs the same attention as any other property.
Portsea is about 1 mile south-west of Portsmouth, in Portsmouth. Any commercial site in Portsea is covered, for single jobs and planned programmes alike. 19 places across Portsmouth fall within our area, including Portsea.
We cover the PO1, PO12 and PO5 postcode districts. If your site is on Main Road, Park Road and Scott Road or close by, send details and we’ll quote for mastic joints. Sites close to Portsea are covered too, including Portsmouth Point (1 mile south), Clayhall (2 miles south-west), Haslar (2 miles south-west), Alverstoke (2 miles south-west) and Privett (2 miles west). A short drive away, we cover Hilsea (3 miles north-east), Wymering (4 miles north-east), Paulsgrove (4 miles north), Cosham (3 miles north-east), Drayton (4 miles north-east) and Farlington (5 miles north-east).
Around Portsea
In Portsea, that means premises near The Ship & Castle pub, St Jude's CofE Primary School and Charter Academy and the streets around them. Portsea has its own railway station: Portsmouth Harbour station. Other landmarks nearby include Royal Portsmouth Hospital (0.8 miles east) and Genesis Expo Creationist Museum (less than half a mile south). The countryside around Portsea includes Milton Locks and Portsdown Hill.
Your questions answered
Will you take on a block within reach of Portsmouth Harbour station?
Yes, and several blocks can go on one quote. We work to your notice and access arrangements.
Is Portsea too far out for you?
Not at all. Portsea is within our area. We work across Greater London and the South East. Send photos and a list of what needs doing, and we will plan the job to need as few trips as possible.
Does the weather affect the work?
It can, for external work. Wet joints and cold, damp or frosty conditions stop the sealant bonding properly, so external work may be moved if conditions aren’t right. Internal work is far less affected.
How do you handle work on occupied blocks?
We plan around people living or working in the building. We agree the programme so you can notify occupiers, and entrances stay in use.
How long do sealant joints last?
Nobody can honestly give a figure in years, because life depends on how much the joint moves, how exposed it is and how it’s cleaned and used. Regular checks let you plan resealing before leaks or damage.
Do you work for managing agents and housing associations?
Yes. Managing agents, property factors in Scotland, housing associations and landlords with block or commercial portfolios are our main clients for this work and work can be quoted per building or as a whole.
Is asbestos a concern with old mastic?
Some mastics in pre-2000 buildings contain asbestos. We check the asbestos register or survey before disturbing it, and if it’s suspected, work stops until it’s tested.