Fire-rated sealing and fire stopping in Thornhill, Southampton
Commercial sealant work in Thornhill for contractors, FMs and building owners: fire-rated and intumescent sealing of service penetrations and linear gaps, quoted at a fixed price.
- Head-of-wall gaps with no fire seal
- Openings found when ceilings come down for a refit
- Old intumescent sealant that has split away
Need fire stopping in Thornhill?
Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.
Fire stopping for commercial buildings in Thornhill
For main contractors, our fire stopping package slots in after the M&E trades have finished in an area. To price a package, speak to us on 01277 525 020 or send details through our quote form with the schedule or marked-up drawings and the specified product data. Tell us what records you need and we will confirm with the quote. We work on joints between fire-resisting walls and floors, cable penetrations and service gaps in risers, and the usual reasons a site gets in touch are damaged fire seals in risers and voids and builders’ foam or ordinary silicone in compartment walls. Sealant applicators who only do sealant are a different proposition from a general trade with a gun in the van: on jobs in Thornhill, preparation and product choice get the time they need.
Buildings in a smaller place such as Thornhill that need fire-rated sealing are typically schools, care homes, surgeries, small offices and flats over shops. Specified fire-rated sealant goes around new services there, built to match the manufacturer’s detail.
We stand by our work with a 12-month guarantee. That covers our preparation and application, and if something we did falls short, we return to it.
- Place
- Thornhill (SO19, SO18, SO30)
- Region
- Southampton
- Guarantee
- 12 months on every job
- Quotes
- A fixed quote before we start
- Call
- 01277 525 020
- Updated
- 3 November 2026
Why deal with it now?
Leave a penetration open and smoke and fire can cross into the next compartment far earlier than intended. Putting it right is usually a modest job when the openings are accessible. Wait until ceilings close or areas are occupied and the same work becomes harder to reach. In a smaller place such as Thornhill, getting a contractor back for a second visit takes time, so it’s worth dealing with every failing joint at once.
Quantities, awkward access and phased working all shape the price. So do site requirements such as inductions and permits, along with the time of year for external work.
Why appoint us
- CHAS accredited contractor
- One contact handling all your sites
- Specification-led, product-correct work
- Our applicators hold CSCS cards
Take a look at our cost guide or our accreditations.
Nearby places to Thornhill
More services for Thornhill
Your questions answered
Does your area include sites such as Hedge End Retail Park, near Thornhill?
Yes, sites like Hedge End Retail Park are within our area, along with the rest of Thornhill. A few photographs and the unit address let us price the work.
Is Thornhill too far out for you?
Not at all. Thornhill is within our area. London and every South East county are within our area. Where we can, we group nearby jobs to make the most of each trip.
How do I request a quote?
It works in four steps: send details, receive a fixed quote, we carry out the work, and it’s guaranteed. Step one needs little more than photos and a postcode.
Who decides which product is used?
The specification comes first, if there is one. If there isn’t one, it comes down to the joint: its movement, its surfaces and what it has to cope with.
Is it fine to apply new sealant on top of old?
No. Failed sealant is removed and the faces cleaned back to sound, dry material first, since fresh sealant will not bond reliably to aged material.
Is colour matching possible?
It depends on the product. Some ranges are wide, others limited, so the available colours are confirmed with the quote.
Can you work to our specification?
Yes. We follow the specification, along with the manufacturer’s installation guidance, and we raise anything unclear before work begins.
Service penetrations in Thornhill buildings
A 2-mile radius around Thornhill takes in several hotels. Hotels are divided into compartments, and refurbishments that add pipes and cables through bedroom and corridor walls leave gaps to close. Approved Document B is the English guidance that covers fire stopping around 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. What we install is set by the specification, and it goes in to the tested detail.
Halls and meeting rooms at places like St Christopher sometimes gain new services, and any compartment wall crossed needs the specified seal. At a university such as Solent University, 2.6 miles to the west of Thornhill, labs, lecture blocks and residences are re-serviced often, so penetration seals are best checked after M&E work.
Thornhill is about 2 miles east of Southampton, in Southampton. We send applicators to Thornhill for service penetrations. Across Southampton, 30 places are covered, Thornhill among them.
Postcode districts covered here: SO19, SO18 and SO30 for service penetrations. Among the streets we cover are Drove Road, Barry Road and Luton Road. With the A334 nearby, Thornhill is straightforward for us to reach. We also cover Harefield (1 mile north), Sholing (1 mile south-west), Bitterne (1 mile west), West End (1 mile north) and Chartwell Green (1 mile north). Further afield, our area takes in Shirley (4 miles west), Regents Park (4 miles west), Maybush (5 miles west), Portswood (3 miles north-west), Coxford (5 miles west) and Freemantle (4 miles west). As one of the bigger centres in Southampton, Thornhill has a broad mix of commercial, public and industrial buildings.
Landmarks near Thornhill
Recent enquiries here include premises near Westwood Woodland Park, Woodlands Community College and Grove Park Business and Enterprise College. For rail, the closest station is Sholing station, roughly 1.4 miles south-west of the centre. Nearby you’ll also find Moorgreen Hospital (1.4 miles north-east) and Bitterne Local History Society Heritage And Research Centre (1.1 miles west). Open spaces near Thornhill include Netley Common.
Common problems we fix in Thornhill
On a busy project, programme pressure can mean fire stopping is rushed or left to whichever trade is closest. That is when untested combinations creep in, which then have to be put right.
Typical triggers for a call:
- Expanding foam used as fire stopping
- Fire seals cut back for extra cables and never reinstated
- Head-of-wall gaps with no fire seal
- Old intumescent sealant that has split away
For a unit at a site such as Hedge End Retail Park, which lies north-east of Thornhill, any new service through a fire-resisting wall should be sealed to the tested detail.
What to look for in a quote
- Whether their applicators hold CSCS cards
- Proof of insurance
- Their plan for phasing and protecting the area
- Will RAMS and insurance details be available?
When it isn’t the sealant
A proper diagnosis includes knowing what sealant can’t do. You’ll hear from us if the cause turns out to be any of the following:
- Large openings beyond what any sealant detail covers
- Gaps in walls that were never built as compartment walls
- Writing the fire-stopping specification
Not sure which it is? You can ring 01277 525 020 or send photos by email and we will tell you honestly before you book.
Where we work in Thornhill
- Service gaps in risers
- Small duct penetrations where the tested detail allows
- Joints between fire-resisting walls and floors
- Linear gaps at wall heads
- Cable penetrations
- Pipe penetrations
Diagnose, treat, sign off
We schedule the visit to fit the site hours and access windows you give us. On the day, the work area is kept contained and tidy, and we check in with your contact before moving on to each new area. For a job in Thornhill, the main thing is a clear picture of the work, so send photographs of each area. You will then get a fixed price for the work.
- First we go through the drawings, schedule or specification for the seals.
- On site, each opening is checked against the tested detail it is meant to follow.
- 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.
- We apply the specified sealant to the depth and around the services as the detail shows.
- If an opening needs something other than sealant, we tell you instead of improvising.
Preparing the site
- Make sure the joints can be reached
- For older buildings, check the asbestos register before work
- Agree which areas must stay open
Quotes
To get a fixed quote, speak to us on 01277 525 020 or email drawings and photos with the site address and an outline of the work. Our quote form is another easy route.
Read more
Different surfaces, different methods
Metal pipes
Sealant details often cover copper and steel pipework. The tested detail sets the pipe size range, gap, depth and whether insulation can stay on, so we check each one.
Masonry and concrete
Core-drilled holes are neat; broken-out ones rarely are. The gap is measured at the widest point so we know it sits within the tested range.
General trades versus a specialist
Site maintenance staff can often handle a short internal joint. The usual problems come from preparation: sealing over old material, sealing onto damp or dusty surfaces, or a product that can’t take the movement.
The visible bead is only part of the job. Correct depth, the right primer and a sealant matched to the movement are where general trades tend to cut corners.