The Mastic Doctor team standing beside their branded vans outside an office building
Hampshire · England

King's Somborne fire stopping

Fire stopping for King's Somborne, from a contractor working since 2005. Fully insured and CHAS accredited.

  • Seals disturbed by maintenance and left open
  • Non-fire-rated filler around services
  • Fire sealant pulled out of the opening
1
Send details
Send the specification, photos or a marked-up plan.
2
Get a quote
A fixed quote for the work, with the scope in writing.
3
We seal
CSCS-carded applicators, the right product for each joint.
4
Guaranteed
Backed by a 12-month workmanship guarantee.
South East, London & Scotland
CHAS accredited
£5m PL insurance

Fire stopping for businesses in King's Somborne

Photos, a specification or a quick description of the joints is enough to start a fixed quote.

General trades versus a specialist

For most general trades, sealant is a sideline. A specialist prepares properly, controls joint depth and picks a product with the right movement class, which is what makes a joint last.

The visible bead is only part of the job. Backing rod, primer where specified and a joint designed to move with the building are easy to get wrong without experience.

Fire stopping in King's Somborne, done properly

No fire sealant works on its own: its test evidence covers one product in one kind of wall or floor, with set services, gaps, depths and backing. Before we seal anything, we check the opening against the detail it is meant to follow, and we say so if it doesn’t fit. We work on joints between fire-resisting walls and floors, cable penetrations and linear gaps at wall heads, and what we’re called in for most is head-of-wall gaps with no fire seal and unsealed penetrations discovered above suspended ceilings. A single leaking joint is often how a building in King's Somborne first comes to us: we check the joints around it and give you an honest view of what needs doing now and what can wait.

Smaller places such as King's Somborne still have buildings with fire-resisting walls and floors: schools, halls, care homes and commercial conversions. If sealant is what the specification names, we install it around the services exactly as the maker’s detail sets out.

We stand by our work with a 12-month guarantee. It covers how we prepared and applied the sealant, and if something we did falls short, we return to it.

Where
King's Somborne (SO20)
Region
Hampshire
Cover
A 12-month guarantee
Quotes
A fixed quote before we start
Call
01277 525 020
Updated
3 November 2026
The Mastic Doctor team beside their liveried vans in front of an office building

What we are called out for in King's Somborne

When a seal departs from its tested detail, the evidence no longer covers it. An oversized gap, too shallow a bead, missing backing or two makers’ products combined are the usual culprits.

It’s worth sending us details if you spot any of the following:

  • Hidden openings found during inspections
  • Open linear gaps along the top of fire-resisting walls
  • Fire seals cut back for extra cables and never reinstated
  • Old intumescent sealant that has split away

For a school such as King's Somborne Church of England Primary School, penetration sealing fits best at the end of the summer works.

Questions to ask before you book

  • Do they follow the manufacturer’s priming guidance?
  • The terms of the workmanship guarantee
  • Their plan for phasing and protecting the area
  • Are they CHAS accredited or on Constructionline?

Choosing a commercial sealant contractor

Common questions from King's Somborne clients

Is King's Somborne too small for you to travel to?

Not at all: smaller places are covered as well as towns. We work across Greater London and the South East. We plan jobs in smaller places so return trips are kept to a minimum.

Can you work on a hospital site such as Romsey Community Hospital?

Yes. We work in healthcare settings as well as offices and schools. Before anything starts, the estates team agrees permits, inductions and infection-control measures with us.

Can you reseal penetrations after our M&E works?

Yes. Send the schedule or marked-up drawings and the specified product details for a fixed quote. We can follow the services contractor floor by floor so areas aren’t left open.

Will you sign off the seals for us?

No. Approval sits with the designer, principal designer or building control. We will confirm the products and details used.

Do the same rules apply to fire stopping in Scotland?

Building standards in Scotland are separate from England’s. Either way, we install the specified sealant to its tested detail.

Is it fine to apply new sealant on top of old?

No. Overlaying old sealant is a frequent cause of early failure, so everything comes out first.

Is any job too small?

Small jobs are welcome alongside larger packages. Send details for a fixed quote.

Surface by surface

Cables and cable bundles

Cable penetrations are frequently sealed with fire-rated sealant where the detail allows. Bundle size, cable type and the space between cables all matter, so we check before sealing.

Linear joints

Joints at the top of partitions may need to move as the slab above deflects. The specified product and backing for that movement are what goes in, with no gaps along the run.

Honest limits

Not every problem is a sealant problem, and we’re upfront when that’s the case. It won’t fix:

  • Signing off or certifying a building’s fire stopping
  • Large openings beyond what any sealant detail covers
  • Reviewing a building’s overall fire safety

If you’re not sure, just call the office on 01277 525 020 or send details through our quote form and we’ll give you a straight answer.

What we seal

  • Linear gaps at wall heads
  • Service gaps in risers
  • Cable penetrations
  • Pipe penetrations
  • Joints between fire-resisting walls and floors
  • Small duct penetrations where the tested detail allows

Penetration seals near King's Somborne

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. Either way, we install the specified product to its tested detail. Central London is about 67 miles from King's Somborne. Tenant changes on commuter-belt business parks mean regular fit-outs, and new services through compartment walls.

On a hospital site such as Romsey Community Hospital (5.8 miles south of King's Somborne), fire-rated sealant goes in where the specification calls for it, with the work planned around the estates team’s permits. Halls and meeting rooms at places like Church of St Peter and St Paul sometimes gain new services, and any compartment wall crossed needs the specified seal.

King's Somborne is about 6 miles north of Romsey, in Hampshire. We cover commercial sites throughout King's Somborne. King's Somborne is one of 723 places we cover in Hampshire for service penetrations. Sites around Southampton have their own page, about 12 miles away.

We take on service penetrations across the SO20 postcode area, whatever the building. We cover commercial and managed buildings on Church Road, Old Palace Farm and Forge Close and the roads nearby. Main routes into King's Somborne include the A3057, which helps when planning parking and deliveries for the job. Close to King's Somborne, our area also takes in Ashley (1 mile east), Little Somborne (2 miles north-east), Up Somborne (2 miles north-east), Braishfield (4 miles south) and Lower Slackstead (4 miles south-east). Nearby towns on our patch include Winchester (7 miles east), Eastleigh (10 miles south-east), Andover (9 miles north), Totton (11 miles south), Chandler's Ford (8 miles south-east) and Hedge End (14 miles south-east).

Local landmarks in King's Somborne

In King's Somborne, that means premises near The Crown Public House. The closest station to King's Somborne is Mottisfont & Dunbridge station, about 4 miles south-west. Well-known places in the area include Romsey Community Hospital (5.8 miles south).

Map of King's Somborne © OpenStreetMap contributors

Why it’s worth doing now in King's Somborne

Sealing behind the M&E trades area by area beats a sweep at the end. Openings are visible, access is open and nothing has to be taken down, and the right detail can be checked at the time. For buildings around smaller places like King's Somborne, water damage can go unnoticed for longer, especially where a building isn’t used daily, which gives a failed joint time to do damage. Renewing joints in good time avoids the problem.

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 us?

  • CSCS-carded applicators
  • Old sealant cut out, never sealed over
  • 12-month guarantee on workmanship
  • Products installed to the manufacturer’s instructions

Take a look at what affects the cost and our accreditations and insurance.

Diagnose, treat, sign off

We begin with a short walk round with whoever looks after the building, agreeing which joints are in scope, where to start and what must stay open. After that, any old or failed material is removed, each joint is prepared and the new sealant goes in. If others near King's Somborne need work, visits can be combined. A fixed quote is given before anything starts.

  1. We ask for the product and detail your designer has specified.
  2. Openings are measured and grouped by detail.
  3. Improvised fillers and failed sealant are removed.
  4. Mineral wool or other backing is fitted where required.
  5. Fire-rated or intumescent sealant goes in around the services and is tooled off.
  6. Completed areas are checked with you, with the records agreed when we quoted.

What we need from you

  • Tell staff and tenants when we’ll be in
  • For older buildings, check the asbestos register before work
  • Confirm the product named in the specification

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 the office on 01277 525 020 or send details through our quote form.

Get a price

Related advice

Accreditations

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