Fire-rated sealing and fire stopping in North End, Portsmouth
Sealant work in North End for main contractors, managing agents and facilities managers: fire-rated and intumescent sealing of service penetrations and linear gaps, with a fixed quote first.
- Non-fire-rated filler around services
- Fire-rated sealant that has cracked or shrunk back
- Unsealed joints where partitions meet the slab
Fire stopping across North End
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
What happens if it’s left?
An unsealed opening affects more than fire safety: they also carry noise, draughts and smells between rooms. Sealing them to the specified detail deals with the fire risk first and the building feels the difference. Over time, UV, weather and movement wear any sealant out. Replacing it before it fails keeps water out.
Every site prices differently: the joint sizes, the specified product, access and working hours each have a bearing. Send the details and a fixed figure follows.
Why choose Mastic Doctor in North End
- CHAS accredited contractor
- Products installed to the manufacturer’s instructions
- One contact handling all your sites
- Sealing commercial buildings since 2005
Take a look at our cost guide or how we’re accredited.
About our fire stopping in North End
The test standards are BS EN 1366-3 for penetration seals and BS EN 1366-4 for linear joints. A rating such as EI 60 only holds when the product is installed as it was tested. Reproducing the tested arrangement on site is the part we take care of. The enquiries we see most involve fire seals cut back for extra cables and never reinstated and seals that don’t match their tested detail, across cable penetrations, joints between fire-resisting walls and floors and service gaps in risers. Searching for sealant specialists in North End? Mastic Doctor has worked for contractors, FMs and building owners since 2005.
Converted and extended buildings around places like North End can mix old and new construction, so it’s worth confirming the wall or floor type before choosing the seal. We match the product to the substrate and service, and say so if a collar, wrap or batt is the specified item.
Guaranteed is the last step of every job. You get a 12-month guarantee on our workmanship, and we explain exactly what that covers when we quote.
- Location
- North End (PO2, PO1)
- Region
- Portsmouth
- Cover
- A 12-month guarantee
- Quotes
- Quoted before any work starts
- Phone
- 01277 525 020
- Page updated
- 3 November 2026
What else we do in North End
Fire stopping in North End: the local picture
North End lies roughly 64 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. North End has two care or nursing homes no more than 2 miles away. Care homes rely on fire-resisting walls and floors, and maintenance work that breaks through them leaves openings to seal. We install fire-rated sealant to the tested detail where it is specified.
Hotels such as The Avenue Hotel, under half a mile to the north-west of North End, rely on fire-resisting walls between bedrooms and corridors, and refits that add services leave penetrations to seal where fire-rated sealant is specified. For a hospital such as St James Hospital, 2.1 miles south-east of North End, penetration sealing is typically phased ward by ward, with infection-control rules agreed first. At a university such as University of Portsmouth - North Zone (1.5 miles south-west of North End), labs, lecture blocks and residences are re-serviced often, so penetration seals are best checked after M&E work.
North End is about 1 mile north of Portsmouth, in Portsmouth. We send applicators to North End for service penetrations. Across Portsmouth, 19 places are covered, North End among them.
We cover the PO2 and PO1 postcode districts for service penetrations. Among the streets we cover are Knox Road, Croft Road and Kirby Road. Being close to the A2047, North End is easy to get to with materials and equipment. Nearby places we also cover include Rudmore (1 mile south-west), Tipner (1 mile west), Portsmouth (1 mile south), Copnor (1 mile south-east) and Hilsea (1 mile north-east).
Local landmarks in North End
Around North End, our work takes us to commercial buildings near Mayfield School, Alexandra Park and St Edmund's Catholic School and the streets around them. For rail, the closest station is Hilsea station, roughly 1.2 miles north-east. Other landmarks nearby include Charles Dickens Birthplace Museum (0.8 miles south-west) and Portchester Castle (2.1 miles north-west). Not far away are Portsdown Hill and Milton Locks.
When something else is needed
Our job is the joint, not everything around it. Sealant alone won’t deal with:
- Fire doors, dampers or other fire safety equipment
- Designing or specifying fire stopping, which sits with the designer or fire engineer
- Walls or floors that aren’t fire-resisting to begin with
If in doubt, call 01277 525 020 or send photos by email and we’ll say what we think before you book.
What we seal
- Cable penetrations
- Linear gaps at wall heads
- Small duct penetrations where the tested detail allows
- Pipe penetrations
- Service gaps in risers
- Joints between fire-resisting walls and floors
Different surfaces, different methods
Masonry and concrete
Block walls and concrete floors are common substrates for penetration seals. Dust and debris are cleared from the opening, so the sealant and any backing sit properly.
Plastic pipes
Plastic waste pipes through slabs come up often. Whether sealant alone is acceptable depends entirely on the tested detail.
Quoting for work in North End
Your fixed quote is built from the real scope. It takes account of:
- The total length or number of joints
- Joint width, depth and condition
- Which sealant the job calls for
- Phasing around occupants
A quote for service penetrations depends on how many there are, their condition and the access, and any specification that applies. Call for a quote.
Details that help us quote
A good diagnosis starts with the right details. Tell us:
- Any dates the work must fit around
- The type of building and who uses it
- Photos of the joints, close up and from further back
- Drawings or a marked-up plan, if available
We quote a fixed sum against the scope you give us, so the cost is agreed before work starts. To start the process, speak to us on 01277 525 020 or email the details over.
Your questions answered
Do you work in occupied care homes around North End?
Yes. We agree rooms and times with the manager and work a few areas at a time. We follow the home’s own procedures throughout.
What does the BS 476 change mean for fire-rated sealant in North End?
Approved Document B loses its BS 476 references from 2 September 2029, and BS EN 13501-2 becomes the route, subject to transitional arrangements. The designer or fire engineer sets the specification, and we install the product to the manufacturer’s tested detail.
Is it fine to apply new sealant on top of old?
No. We cut the old material out and clean the joint back before sealing, since fresh sealant will not bond reliably to aged material.
Can weather delay the job?
For external joints, yes. Sealant needs a dry joint and a temperature within the product’s range, so damp, frosty or very cold days can stop external work. Inside work is seldom held up.
Who decides which product is used?
If the job is specified, we follow the specification. Otherwise, we recommend a product to suit the joint’s movement, the substrate and the conditions, following the manufacturer’s guidance.
Can the sealant be colour-matched?
That depends on the product. Some ranges offer many colours, others very few, so the available colours are confirmed with the quote.
What happens if old sealant might contain asbestos?
Asbestos is possible in some older mastics, particularly in buildings from before 2000. We check the asbestos register before cutting out old sealant in an older building, and work stops until any suspect material has been tested. Removing asbestos is a job for asbestos specialists, not us.
Diagnose, treat, sign off
Before any cutting starts, the area is protected: tape along each joint edge and covers over finishes, stock and equipment close by. On site, the work usually takes a single visit for a short list of penetrations, or a phased programme for a whole building, and we clear our waste as we work. For a job in North End, the main thing is a clear picture of the work, so send photos of each area. A fixed quote follows.
- We read the specification, drawings or penetration schedule you send.
- Every penetration is compared with its detail: wall or floor type, service, gap size and depth.
- Anything that doesn’t belong in the opening, such as expanding foam or general-purpose filler, is removed.
- We fit the backing the detail asks for, to the stated depth.
- Fire-rated or intumescent sealant is gunned in to the specified depth, then tooled.
- Openings that need a collar, wrap, batt or other product are flagged to you rather than filled with sealant.
Preparing the site
- Confirm the product named in the specification
- Share your working hours and any access restrictions
- Tell us which areas need to stay in use
Quotes
To get a fixed quote, call the office on 01277 525 020 or email us with the site address and an outline of the work. Our quote form is another easy route.
Related advice
Commercial clients in North End
When you manage a building on behalf of an owner, clear figures and clear communication matter. We quote a fixed sum, confirm the scope and walk the finished work with you or your representative, plus a 12-month guarantee.
We take on planned maintenance as well as one-off repairs: resealing failed joints building by building, on a schedule that suits your budget. North End can form part of a wider programme across Portsmouth.