Fire-rated sealing and fire stopping in Alverstoke, Hampshire
Our CSCS-carded applicators take on fire-rated and intumescent sealing of service penetrations and linear gaps in Alverstoke and the surrounding area. Send details for a fixed quote.
- Openings left by services added after handover
- Open linear gaps along the top of fire-resisting walls
- Snag lists that include open service penetrations
Fire stopping for businesses in Alverstoke
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
What happens if it’s left?
Inspections and handover checks often pick up fire stopping. Finding unsealed or improvised openings late can hold up a programme, so earlier action pays back. Halls, stores and units around places like Alverstoke may not be checked every day, so a failed joint can leak for a while before anyone sees it. Resealing early avoids that.
What a job costs comes down to the quantity of joints, how much old material needs removing and the access. Call for a quote once you have the details.
Why choose Mastic Doctor in Alverstoke
- Fully insured
- Old sealant cut out, never sealed over
- Health and safety: CHAS accredited
- One phone line for London, the South East and Scotland
Take a look at how commercial sealant jobs are priced and our accreditations and insurance.
Fire stopping for commercial buildings in Alverstoke
Penetration seals are fire tested to BS EN 1366-3 and linear joint seals to BS EN 1366-4. 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. If you have unsealed openings around new pipes and cables and damaged fire seals in risers and voids, we can put it right, whatever the surface. Facilities teams, main contractors and managing agents in Alverstoke tend to want the same three things: a fixed quote, no surprises on site and a 12-month guarantee behind the result.
Rural conversions around Alverstoke can put new fire-resisting partitions inside older structures. A penetration seal only performs as tested if product, substrate, service, gap and depth all match the detail.
Every job we finish is backed by a 12-month workmanship guarantee. If our installation lets you down in that time, we return and fix it.
- Where
- Alverstoke (PO12)
- Wider area
- Hampshire
- Guarantee
- A 12-month guarantee
- Price
- Fixed quote, scope in writing
- Telephone
- 01277 525 020
- Page updated
- 3 November 2026
More services for Alverstoke
Signs you need fire stopping in Alverstoke
Linear gaps fail where a fire-resisting wall meets a slab, soffit or another wall. Deflection and building movement can open these gaps. Linear joint details set a width range and movement capability, and the seal has to sit within them.
Site and facilities staff are often the first to spot these:
- Fire-stopping items raised at inspection or handover
- Seals disturbed by maintenance and left open
- Hidden openings found during inspections
- Seals that don’t match their tested detail
Hospital estates such as Gosport War Memorial Hospital (0.9 miles north of Alverstoke) are divided into fire compartments, and any service penetration through them should be sealed to the specified, tested detail.
Questions to ask before you book
- What the guarantee covers, and for how long
- How joint depth will be controlled
- Whether primer will be used where the manufacturer specifies it
- Proof of insurance
Keeping the joints sound
Sealant joints are maintenance items, and how long they last depends on how they’re treated. We suggest:
- Check with the data sheet before painting over fire sealant
- Flag new cables with no seal around them
- Ask the designer to confirm details early on refits
- Put resealing into every M&E and fit-out package
Don’t patch a fire-rated seal with anything outside its tested detail. A repair should use the original product, installed the same way unless the designer specifies otherwise.
Specify fire stopping early on refits, not as an afterthought. Details can then be picked to suit the actual pipes, cables and ducts, and installation follows the programme.
Honest limits
Our job is the joint, not everything around it. Sealant alone won’t deal with:
- Issuing fire ratings or certificates for seals
- Reviewing a building’s overall fire safety
- Large openings beyond what any sealant detail covers
If you are not sure, just call the office on 01277 525 020 or email us and we’ll give you a straight answer before you book.
Where we work in Alverstoke
- Linear gaps at wall heads
- Cable penetrations
- Service gaps in risers
- Joints between fire-resisting walls and floors
- Small duct penetrations where the tested detail allows
- Pipe penetrations
Questions we are asked in Alverstoke
Is Alverstoke too small for you to travel to?
No. Small places get the same service as large ones. London and every South East county are within our area. Send photos and a list of what needs doing, and we will plan the job to need as few trips as possible.
How does the removal of BS 476 from Approved Document B affect fire-rated sealing in Alverstoke?
From 2 September 2029, Approved Document B drops its BS 476 references in favour of BS EN 13501-2 classification, with transitional arrangements. Our part doesn’t change: the specified product, to its tested detail.
Do you seal on top of existing sealant?
No, never. Sealing over old material is one of the classic causes of early joint failure, so it all comes out first.
How many days will you need on site?
It depends on the scope, though a typical visit typically takes a single visit for a short list of penetrations, or a phased programme for a whole building. For bigger or phased jobs, we will set out a timescale with the quote.
Does weather matter for sealant work?
Outside, 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. Internal work is rarely affected.
Can you quote from photographs?
Many jobs can be quoted from photos, drawings or a joint schedule. If the job needs a look first, we will arrange a visit before quoting.
What hours do you work?
The office is staffed Monday to Friday, from 8am until 5pm. Let us know your site hours and access windows, and the work will be planned around them.
Building owners, agents and FMs in Alverstoke
As a CHAS accredited contractor and Constructionline member, we make supplier vetting simple. Our insurance certificate can be sent along with the quote.
Facilities managers want contractors who arrive with the paperwork sorted. Let us know the documents you need (RAMS, insurance certificate, CSCS details) and we will confirm them with the quote.
Service penetrations in Alverstoke buildings
Fire stopping of openings and penetrations in England falls under Approved Document B. References to the older BS 476 classes are being removed from it from 2 September 2029, after which the European classification, BS EN 13501-2, is the route, subject to transitional arrangements. Our part stays the same: the specified product, installed to its tested detail. The 2 miles around Alverstoke include six care or nursing homes. In a care home, any new pipe or cable through a fire-resisting wall should be sealed to the specified detail. Where that’s fire-rated sealant, we install it to the manufacturer’s tested detail.
Residences at universities like University of Portsmouth - North Zone, 2.6 miles north-east of Alverstoke, have compartment walls that must be resealed whenever services change. For a hotel such as Anglesey Hotel (under half a mile north-east of Alverstoke), penetration seals are worth checking after any refit or services upgrade.
Alverstoke is about 2 miles south of Gosport, in Hampshire. Anywhere in PO12, it works the same way: details in, fixed quote out, then sealing and a 12-month guarantee. Across Hampshire, 723 places are covered, Alverstoke among them.
Business premises anywhere in PO12 are within our area for service penetrations. Buildings on The Lane, Fort Road and Church Road are within our area for service penetrations. Close to Alverstoke, our area also takes in Clayhall (1 mile east), Haslar (1 mile east), Privett (1 mile north-west), Portsmouth Point (2 miles north-east) and Portsea (2 miles north-east). Nearby towns on our patch include Havant (9 miles north-east), Fareham (5 miles north), Horndean (11 miles north-east), Hedge End (12 miles north-west), Waterlooville (9 miles north-east) and Purbrook (8 miles north-east).
What’s near Alverstoke
Recent enquiries here include premises near Bay House School and Village Home pub and the streets around them. For rail, the closest station is Portsmouth Harbour station, roughly 2.1 miles north-east of the centre. Nearby you’ll also find Tricorn Centre (3 miles north-east) and Gosport War Memorial Hospital (0.9 miles north). Open spaces near Alverstoke include West of the River Alver.
From enquiry to sign-off
Where the site stays busy, we agree a sequence with your contact so the disruption stays in one area at once. Each section is protected, cleaned back and sealed, then handed back before we move to the next. For work around Alverstoke, we aim to finish in one visit, so photographs and measurements up front really help. Then the right materials arrive with us.
- We ask for the product and detail your designer has specified.
- We sort the openings by the detail each one needs.
- Old or wrong materials are cut out.
- Where the detail needs backing, it goes in at the stated depth.
- We gun the sealant in to the specified depth around each service and tool it.
- Completed areas are checked with you, with the records agreed when we quoted.
Before we start on site
- Share your working hours and any access restrictions
- Clear stock, furniture or equipment away from the joints
- Have the specification and drawings to hand
Get a fixed quote
To get a fixed quote, phone 01277 525 020 or use the quote form, telling us the site location and the nature of the job. Our quote form is another easy route.