Southsea fire stopping
Need fire stopping in Southsea? Send us the details for a fixed quote, backed by a 12-month guarantee on the work.
- Unsealed openings around new pipes and cables
- Openings found when ceilings come down for a refit
- Open linear gaps along the top of fire-resisting walls
Fire stopping in Southsea
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
Fire stopping in Southsea, done properly
It helps to set out our role at the start. Deciding the specification sits with the designer, the fire engineer and building control; sign-off sits with them too. We fit the specified fire-rated sealant following that specification and the maker’s installation guidance. If you are dealing with fire-stopping items raised at inspection or handover and damaged fire seals in risers and voids, we can put it right. Most enquiries from Southsea start with one failed joint and grow into a wider look at the building: we check the joints around it and give you an honest view of what needs doing now and what can wait.
In a town like Southsea, penetration seals typically need attention after other trades have been through. Checking after M&E works is good practice, and we’ll seal what’s found where fire-rated sealant is the specified product.
What our 12-month guarantee covers is the way we did the job: preparation, application and finish. It doesn’t extend to damage, other trades’ later work or movement the joint was never designed to take.
- Where
- Southsea (PO5, PO4, PO1)
- Region
- Portsmouth
- Cover
- 12 months on our workmanship
- Price
- A fixed quote before we start
- Call
- 01277 525 020
- Last updated
- 3 November 2026
Common problems we fix in Southsea
Some seals fail because the wrong product went in: builders’ foam or ordinary silicone used to fill a hole. It may look closed, but it has no tested fire performance in that position.
Typical triggers for a call:
- Hidden openings found during inspections
- Service penetrations left open after M&E works
- Fire stopping installed outside its tested range
- Fire-stopping items raised at inspection or handover
For a hotel such as G Boutique Hotel, which lies south of Southsea, penetration seals are worth checking after any refit or services upgrade.
What your quote should include
- Is the sealant right for the movement and the substrate?
- Health and safety accreditation such as CHAS
- Whether old or failed sealant will be cut out, not overlaid
- Who will actually carry out the work
For managing agents and facilities managers
Facilities managers want contractors who arrive with the paperwork sorted. Tell us what site paperwork you need, such as RAMS, an insurance certificate or CSCS details, and we will confirm with the quote.
For main contractors, we work as the sealant subcontractor, on new build and refurbishment alike. Programme, specification and site rules come first.
Compartments and services around Southsea
Southsea lies roughly 65 miles out from central London. Offices around the capital are refitted often, and the cabling that follows can breach fire-resisting walls; the gaps need the specified seal. Southsea has four care or nursing homes no more than 2 miles away. Where new services have gone through compartment walls in a care setting, the gaps need the specified product. Where that’s fire-rated sealant, we install it to the manufacturer’s tested detail.
Campus buildings at universities such as University of Portsmouth, 0.6 miles north of Southsea, see constant changes to data and services, and fire-rated sealant goes in around new penetrations where it is specified. Shop fits on retail sites such as The Bridge Shopping Centre (1 mile north of Southsea) can bring new services through fire-resisting walls between units, to be sealed with the specified product.
Southsea is about 2 miles south of Portsmouth, in Portsmouth. Any commercial site in Southsea is covered. Southsea is one of 19 places in Portsmouth on our list.
Business premises anywhere in PO5, PO4 and PO1 are within our area for service penetrations. Streets here include Bath Road, Liss Road and Beach Road, and sites on any of them can send details for a fixed quote. We also cover Milton (1 mile north-east), Fratton (1 mile north), Kingston (1 mile north), Landport (1 mile north-west) and Baffins (2 miles north) for service penetrations. A short drive away, we cover 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).
Landmarks near Southsea
Around Southsea, our work takes us to commercial buildings near The Festing pub, St Edmund's Catholic School and Mayville High School. The nearest railway station is Fratton station, roughly 0.8 miles north of the centre. A little further out are St. Mary's Hospital (1 mile north) and Southsea Castle (1 mile south-west). Open spaces near Southsea include Milton Locks.
What sealant work can’t fix
We seal joints; we don’t mend everything behind them. On its own, sealant can’t deal with:
- Plastic pipes whose detail calls for a collar or wrap
- Fire doors, dampers or other fire safety equipment
- Designing or specifying fire stopping, which sits with the designer or fire engineer
If in doubt, speak to us on 01277 525 020 or use the quote form and we will say what we think before you book.
Surfaces we seal
- Linear gaps at wall heads
- Cable penetrations
- Service gaps in risers
- Small duct penetrations where the tested detail allows
- Joints between fire-resisting walls and floors
- Pipe penetrations
How the job changes by surface
Cables and cable bundles
Data cabling added after handover is a regular cause of open service penetrations. We reseal around them to the specified detail.
Linear joints
Head-of-wall joints often have to absorb slab deflection. The specified product and backing for that movement are what goes in, along the full length of the run.
On site: what to expect
Where the site stays busy, we agree a sequence with your contact so the disruption stays in one area at once. Each area is protected, prepared and sealed before the next one starts. If you have more than one building in Southsea, they can often be done on the same visit, with one quote covering them. Give us your access times and we will fit the work in.
- We ask for the product and detail your designer has specified.
- Openings are measured and grouped by detail.
- Old or wrong materials are cut out.
- Mineral wool or other backing is fitted where required.
- We gun the sealant in to the specified depth around each service and tool it.
- We walk the completed areas with you and confirm the records agreed at quote stage.
Preparing the site
- Send any specification or drawings in advance
- Tell us your opening times and when work is allowed
- Agree which areas must stay open
Request a quote
Pricing a project or setting a maintenance budget? We’ll quote against your scope and drawings that you can work with. If you have questions first, phone 01277 525 020 or use the quote form.
Read more
Towns and villages near Southsea
Other services in Southsea
After the work
To get the most from the new sealant:
- Ask the designer to confirm details early on refits
- Keep product data and details in the fire safety file
- Check with the data sheet before painting over fire sealant
- Have penetrations checked while they can still be seen
After the work, brief anyone else working in the area that the openings are now sealed. If a seal has to be opened for a new service, it should be reinstated to the same detail using the same product.
Regular walk-rounds of service areas are worth the time. A cracked or disturbed seal found early is a small job; found late, it can be one of many.
Your questions answered
Will you take on work at estates like The Bridge Shopping Centre, close to Southsea?
Yes. Our area takes in Southsea and its surroundings, with estates and business parks such as The Bridge Shopping Centre included. Send details of the unit and the work through our quote form for a quick quote.
Would you work within a site like St James Hospital?
Yes, provided the work is planned with the site’s estates team. We follow the site’s permits, sign-in and infection-control procedures in every area.
Are you fully insured?
Yes. Mastic Doctor is fully insured, public liability included.
What will the job cost?
Each job is quoted on its own details. To get one, speak to us on 01277 525 020 or email drawings and photos.
Do you need to see the site first?
That depends on the size and complexity of the job. Simple work can often be priced from photos, and bigger or more complex jobs typically get a visit.
What changes on 2 September 2029?
In England, references to the older BS 476 national classes are being removed from Approved Document B from 2 September 2029, subject to the Government’s transitional arrangements. After that, the European classification under BS EN 13501-2 is the route. Your designer will choose products with the right evidence.
Will you quote for a small job?
Single areas, one-off repairs and whole buildings are all quoted the same way: details, then a fixed price, then sealing, then a 12-month guarantee.