Fire-rated sealing and fire stopping in Shenleybury, Hertfordshire
Planning work on a service penetration in Shenleybury? We assess it, carry out the work and guarantee our workmanship for 12 months.
- Seals disturbed by maintenance and left open
- Fire stopping installed outside its tested range
- Unsealed joints where partitions meet the slab
Fire stopping for Shenleybury sites
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
Why act early in Shenleybury
An open or wrongly sealed service penetration lets fire and smoke reach the next compartment much sooner than the building was designed for. While the openings can be reached, sealing them is normally straightforward. Left until ceilings are closed or a tenant moves in, the same work costs more access and more disruption. Halls, stores and units around places like Shenleybury may not be checked every day, which gives a failed joint time to do damage. Resealing early avoids that.
The work involved drives the cost: stripping out, preparation, sealing, access and phasing. Call for a quote.
Why us?
- One phone line for London, the South East and Scotland
- Sealing commercial buildings since 2005
- A Constructionline member, so easy to vet
- Health and safety: CHAS accredited
Fire stopping for commercial buildings in Shenleybury
Penetration seals are fire tested to BS EN 1366-3 and linear joint seals to BS EN 1366-4 and the results are classified to BS EN 13501-2. That classification, such as EI 60 or EI 120, belongs to the product in its tested arrangement. So our job is to reproduce that arrangement faithfully. If you are dealing with non-fire-rated filler around services and openings found when ceilings come down for a refit, we can help, on linear gaps at wall heads, service gaps in risers and joints between fire-resisting walls and floors alike. A single leaking joint is often how a building in Shenleybury first comes to us: we look at the rest while we’re there and tell you what we find.
Barn and farm-building conversions near places like Shenleybury often combine new partitions with old walls. A penetration seal only performs as tested if product, substrate, service, gap and depth all match the detail.
Building owners and contractors get the same cover: a 12-month guarantee on our workmanship. It doesn’t extend to damage, faults in the building or work by others, and we are upfront about that.
- Where
- Shenleybury (WD7)
- Region
- Hertfordshire
- Guarantee
- 12 months on every job
- Quotes
- Fixed quote, scope in writing
- Telephone
- 01277 525 020
- Updated
- 3 November 2026
Compartment walls and floors in Shenleybury
Approved Document B is the English guidance that covers fire stopping around openings and penetrations. From 2 September 2029, BS 476 references are being taken out of Approved Document B, leaving BS EN 13501-2 classification as the route, subject to the Government’s transitional arrangements. We install whatever has been specified, to the product’s tested detail. A 2-mile radius around Shenleybury takes in several hotels. A hotel refit often runs new services through compartment walls between bedrooms and corridors, and each opening needs the specified seal.
For a unit at a site such as Colney Fields Shopping Park (0.8 miles north of Shenleybury), any new service through a fire-resisting wall should be sealed to the tested detail. In a school such as Clore Shalom School, fire-rated sealant goes in around service penetrations where it is specified.
Shenleybury is about 3 miles north of Borehamwood, in Hertfordshire. Any commercial site in Shenleybury is covered, whether it’s a single job or part of a planned programme. Our Hertfordshire coverage takes in 371 places. London is covered too, some 16 miles away.
We cover the WD7 postcode districts for service penetrations. If your site is on Hugo Gryn Way, Farm Close and Shenleybury or close by, we can quote for service penetrations. Nearby places we also cover include Broad Colney (1 mile north-west), London Colney (1 mile north), Tyttenhanger (2 miles north), Colney Heath (3 miles north-east) and North Mymms (3 miles east). Bigger towns within reach include Watford (5 miles south-west), Hemel Hempstead (8 miles north-west), Stevenage (15 miles north), St Albans (4 miles north-west), Welwyn Garden City (8 miles north-east) and Harpenden (8 miles north).
Around Shenleybury
In Shenleybury, that means premises near The Black Lion pub, Manor Lodge School and North Mimms Park, among other places. For rail, the closest station is Radlett station, roughly 1.8 miles south-west of the centre. Well-known places in the area include Hilfield Castle (4 miles south-west) and The Maltings (3.8 miles north-west). The countryside around Shenleybury includes Verulamium Lake and Broad Colney Lakes.
Surface by surface
Linear joints
Linear joints run along the head of a wall, at a slab edge or between two fire-resisting elements. Their tested detail, under BS EN 1366-4, sets the width, depth, backing and movement allowed and the installation has to fit inside those limits.
Plastic pipes
In a fire, plastic pipework melts away and leaves an opening. Some intumescent sealants are tested on smaller plastic pipes, but many need a collar or wrap. We confirm material and size first and tell you if sealant isn’t the right product.
Nearby places to Shenleybury
Also in Shenleybury
Questions we are asked in Shenleybury
Can you work on a hospital site such as Kingsley Green Hospital?
Yes, healthcare and care buildings are part of our work. Each area is agreed with the ward or department and the estates team in advance.
How does the removal of BS 476 from Approved Document B affect fire-rated sealing in Shenleybury?
From 2 September 2029, Approved Document B drops its BS 476 references in favour of BS EN 13501-2 classification, with transitional arrangements. Whichever applies, we install the specified product to its tested detail; the specification is for the designer to set.
How long before the joints can be used?
We’ll confirm how long the chosen product needs to cure, and flag anything to keep off until it has cured.
How do I request a quote?
The quote form is the simplest route, though you can also give us a call on 01277 525 020 or send details through our quote form. Photos, drawings or a joint schedule help us quote quickly.
Are your applicators CSCS-carded?
Yes. Our applicators hold CSCS cards, which many sites require.
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.
Are you CHAS accredited and on Constructionline?
Yes. We are CHAS accredited, we’re a Constructionline member and we use CSCS-carded applicators.
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 normally takes longer where risers, ceiling voids or occupied floors have to be worked through in sequence, and we clear our waste as we work. For work around Shenleybury, 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.
- Old or wrong materials are cut out.
- Mineral wool or other backing is fitted where required.
- We gun the sealant in to the specified depth around each service and tool it.
- We walk the completed areas with you and confirm the records agreed at quote stage.
What we need from you
- Clear stock, furniture or equipment away from the joints
- Let building users know which areas are affected
- Arrange parking or a loading space
Request a quote
Quotes are fixed against the scope you send, so you know the figure before anyone is on site. To start the process, call 01277 525 020 or send photos by email.
Read more
When to call us in Shenleybury
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.
If one of these sounds familiar, it’s time for a closer look:
- Seals that don’t match their tested detail
- Openings found when ceilings come down for a refit
- Expanding foam used as fire stopping
- Unsealed joints where partitions meet the slab
At a university such as University of Hertfordshire (3.9 miles north-east of Shenleybury), labs, lecture blocks and residences are re-serviced often, so penetration seals are best checked after M&E work.
What your quote should include
- Whether their applicators hold CSCS cards
- How joint depth will be controlled
- Are they CHAS accredited or on Constructionline?
- What the guarantee covers, and for how long
Cost factors for service penetrations
What shapes the price:
- Whether old sealant has to be cut out first
- Which sealant the job calls for
- How much there is to seal
- Working within restricted access windows
Quantities, awkward access and phased working all shape the price. Site requirements like inductions and permits play a part as well.
What to include in your enquiry
It doesn’t need to be a full survey. These details are enough to start:
- Where the site is, with the postcode
- Asbestos survey details if the building is older
- Specification clauses that apply
- Access details, including height
Tell us about the building, the joints and when you need the work done, and a fixed quote will follow. The easiest way is to give us a call on 01277 525 020 or send details through our quote form.
What we can’t put right
Sealant solves a lot, but not everything, and we are upfront when that’s the case. It won’t fix:
- Plastic pipes whose detail calls for a collar or wrap
- Deciding what a wall or floor needs, which belongs to the designer
- Fire doors, dampers or other fire safety equipment
Not sure which it is? You can give us a call on 01277 525 020 or email us and we’ll tell you honestly.
What we seal
- Small duct penetrations where the tested detail allows
- Cable penetrations
- Joints between fire-resisting walls and floors
- Service gaps in risers
- Pipe penetrations
- Linear gaps at wall heads