Fire-rated sealing and fire stopping in Haslar, Hampshire
Looking for fire stopping in Haslar? Send us the details for a fixed quote, backed by a 12-month guarantee on the work.
- Fire sealant pulled out of the opening
- Fire seals cut back for extra cables and never reinstated
- Hidden openings found during inspections
Need fire stopping in Haslar?
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
Fire stopping in Haslar, done properly
Fire-rated sealant suits many small service penetrations: copper and steel pipes, cables and some small ducts where the tested detail allows. Other openings need collars, wraps, batts, pillows or boards. If the detail calls for something other than sealant, we say so rather than force sealant into it. We work on linear gaps at wall heads, pipe penetrations and joints between fire-resisting walls and floors, and the failures we’re asked to look at most are fire seals cut back for extra cables and never reinstated and unsealed openings around new pipes and cables. Sealant contractors, mastic applicators, sealant specialists: whatever the job title on the order, the work in Haslar is the same: the right product in a properly prepared joint.
Around smaller places like Haslar, penetration seals come up in schools, halls, pubs with rooms, care homes and farm buildings used as offices. If sealant is what the specification names, we install it around the services exactly as the maker’s detail sets out.
Building owners and contractors get the same cover: twelve months on the work we carried out. It doesn’t extend to damage, faults in the building or work by others, and we are upfront about that.
- Where
- Haslar (PO12)
- Region
- Hampshire
- Cover
- 12 months on every job
- Quotes
- Quoted before any work starts
- Phone
- 01277 525 020
- Updated
- 3 November 2026
Diagnose, treat, sign off
Diagnose, treat, sign off: that’s the shape of every visit. First comes an inspection and agreement on scope, then we prepare and seal each joint with the specified product, and the job ends with a walk round and sign-off. For work around Haslar, we aim to finish in one visit, so we ask for photographs and rough sizes first. Then the right materials arrive with us.
- First we confirm the product and tested details named in the specification.
- We sort the openings by the detail each one needs.
- Improvised fillers and failed sealant are removed.
- Mineral wool or other backing is fitted where required.
- Fire-rated or intumescent sealant goes in around the services and is tooled off.
- We walk the completed areas with you and confirm the records agreed at quote stage.
Getting the site ready
- Let building users know which areas are affected
- Share the asbestos register for older buildings
- Arrange parking or a loading space
Getting a fixed quote
We quote a fixed sum against the scope you give us, so you know the figure before anyone is on site. To ask for one, call 01277 525 020 or send details through our quote form.
Related advice
FAQs: Haslar
Could you schedule work at a campus like University of Portsmouth - North Zone for the vacation?
Yes, holiday working periods are the norm on campus jobs. Any paperwork you need, from RAMS to our insurance certificate and CSCS details, is confirmed with the quote.
Can you work on a hospital site such as Gosport War Memorial Hospital?
Yes, healthcare and care buildings are part of our work. Work is phased so departments keep running, under the site’s own rules.
Do you need to see the site first?
It depends on the job. Straightforward work can often be priced from photographs and measurements, and bigger or more complex jobs normally get a visit.
How do I request a quote?
You can use the quote form on this site; alternatively, phone 01277 525 020 or email the details over. Photos, drawings or a joint schedule help us quote quickly.
Are you members of a third-party fire-stopping installer scheme?
No, and we’d rather be clear about that. Some clients require third-party installer schemes even though the law doesn’t, so check your contract first. If it doesn’t require one, we can install the specified fire-rated sealant to its tested detail.
How do you choose the sealant?
The specification comes first, if there is one. If there isn’t one, it comes down to the joint: how much it moves, what it bonds to and whether it’s wet, trafficked or fire-rated.
Do you have public liability insurance?
Yes. We’re fully insured, including public liability cover.
For managing agents and facilities managers
Building owners and managing agents use us on everything from one building to a spread of sites. One quote can cover more than one site, so there’s one set of paperwork to deal with.
Hospitality, education, healthcare, office and retail clients come to us directly as well. We plan around the way the building is used, so the building keeps working while we do.
When to call us in Haslar
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 and has to be removed.
If one of these sounds familiar, it’s time for a closer look:
- Fire-rated sealant that has cracked or shrunk back
- Expanding foam used as fire stopping
- Fire seals cut back for extra cables and never reinstated
- Hidden openings found during inspections
Colleges such as St Vincent College (to the north of Haslar) add IT and services as courses change, and each new penetration through a fire-resisting wall needs sealing with the specified product.
What your quote should include
- How they’ll work around occupants
- Whether primer will be used where the manufacturer specifies it
- What site paperwork they can supply
- Health and safety accreditation such as CHAS
Surface by surface
Cables and cable bundles
Single cables and small bundles are often within a fire-rated sealant’s tested detail. The detail limits bundle size and the gaps between and around cables and we work within those limits.
Risers and ceiling voids
Openings above suspended ceilings are easy to miss. We follow your schedule area by area and tell you about openings outside the list.
Nearby places to Haslar
What else we do in Haslar
What sealant work can’t fix
Being straight saves everyone time. New sealant won’t cure:
- Gaps in walls that were never built as compartment walls
- Deciding what a wall or floor needs, which belongs to the designer
- Approving the work on behalf of building control
If you are not sure, just phone 01277 525 020 or email a schedule or drawings and we will give you a straight answer before you book.
What we seal
- Service gaps in risers
- Joints between fire-resisting walls and floors
- Small duct penetrations where the tested detail allows
- Pipe penetrations
- Cable penetrations
- Linear gaps at wall heads
Leave it or put it right?
An unsealed opening affects more than fire safety: they also carry noise, draughts and smells between rooms. The specified fire seal closes the gap for all of these and the building feels the difference. Halls, stores and units around places like Haslar may not be checked every day, which gives a failed joint time to do damage. Resealing early avoids that.
Access can matter as much as the joints themselves: joints within easy reach take less time than ones that need access equipment. Mention the access as part of your enquiry.
Why choose Mastic Doctor in Haslar
- Constructionline member
- One phone line for London, the South East and Scotland
- Fully insured
- Sealing commercial buildings since 2005
Read what affects the cost or our accreditations.
Fire stopping in Haslar: the local picture
A 2-mile radius around Haslar takes in plenty of hotels. In hotels, bedroom and corridor walls are usually fire-resisting, so services added in a refit need sealing with the specified product. In England, Approved Document B covers fire stopping of openings and penetrations. The national BS 476 classes are due to drop out of it from 2 September 2029, leaving the European BS EN 13501-2 route, subject to transitional arrangements. We install whatever has been specified, to the product’s tested detail.
For an estates team at a campus like University of Portsmouth - North Zone, which lies north-east of Haslar, summer M&E works are usually followed by a round of penetration sealing. Tenant changes at centres like Tricorn Centre (to the north-east of Haslar) often mean new services through walls between units.
Haslar is about 2 miles south-east of Gosport, in Hampshire. Any commercial site in Haslar is covered. Our Hampshire coverage takes in 723 places, from busy centres to rural villages.
Postcode districts covered here: PO12. Streets here include Froude Road, Military Road and Monckton Road, and sites on any of them can send details for a fixed quote. We also cover Clayhall (1 mile north-west), Alverstoke (1 mile west), Portsmouth Point (1 mile north-east), Privett (2 miles north-west) and Portsea (2 miles north-east) for service penetrations. Further afield, our area takes in Havant (8 miles north-east), Fareham (6 miles north-west), Horndean (10 miles north-east), Hedge End (12 miles north-west), Waterlooville (8 miles north-east) and Purbrook (7 miles north-east).
Near you in Haslar
We work on buildings around The Fighting Cocks pub, Bay House School and St Vincent College. Haslar’s nearest station is Portsmouth Harbour station, about 1.5 miles north-east. Nearby you will also find Tricorn Centre (2.3 miles north-east) and Southsea Castle (1.8 miles east). Green spaces nearby include West of the River Alver.