Fire stopping in Chells
Commercial sealant work in Chells for contractors, FMs and building owners: fire-rated and intumescent sealing of service penetrations and linear gaps, with a fixed quote first.
- Builders’ foam or ordinary silicone in compartment walls
- Unsealed joints where partitions meet the slab
- Seals disturbed by maintenance and left open
Fire stopping for businesses in Chells
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
Fire stopping for commercial buildings in Chells
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. So our job is to reproduce that arrangement faithfully. If you have non-fire-rated filler around services and unsealed penetrations discovered above suspended ceilings, we can help, on joints between fire-resisting walls and floors, pipe penetrations and cable penetrations alike. Whether you call it commercial sealant work, mastic application or joint sealing, the work in Chells is the same: failed joints cut out, faces prepared and the right sealant laid to the right depth.
In places the size of Chells, fire-resisting walls and floors are found in schools, care homes, health centres and mixed-use buildings. Specified fire-rated sealant goes around new services there, built to match the manufacturer’s detail.
We sign every job off with a 12-month guarantee. It’s a plain promise: if the work we did fails within twelve months, we return to fix it.
- Place
- Chells (SG2, SG1)
- Region
- Hertfordshire
- Cover
- 12 months on every job
- Price
- Fixed quote, scope in writing
- Phone
- 01277 525 020
- Updated
- 3 November 2026
What the job involves on each surface
Plastic pipes
Plastic pipes soften and collapse in a fire. Some intumescent sealants are tested on smaller plastic pipes. We check the pipe material and diameter against the detail before we start.
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 and we confirm each before sealing.
When to call us in Chells
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.
Common reasons buildings call us in:
- Old intumescent sealant that has split away
- Unsealed openings around new pipes and cables
- Builders’ foam or ordinary silicone in compartment walls
- Snag lists that include open service penetrations
Older community buildings such as St Hugh & St John that have been rewired or given new heating can have service gaps through walls worth checking against the specification.
Before you book anyone
- The named product and why it was chosen
- What level of public liability insurance do they hold?
- Whether old or failed sealant will be cut out, not overlaid
- How they’ll work around occupants
Work for main contractors and building owners
When you manage a building on behalf of an owner, you need clear quotes and clear reporting. You get a fixed quote, an agreed scope and a walk round at the end, plus a 12-month guarantee.
Hotels, schools, healthcare sites, offices and retail units book us directly too. We plan around the way the building is used, so guests, pupils, patients or staff are disturbed as little as possible.
What sealant work can’t fix
A few problems need another trade or a different fix, and we point that out rather than sealing over them:
- Walls or floors that aren’t fire-resisting to begin with
- Deciding what a wall or floor needs, which belongs to the designer
- Openings that need collars, wraps, batts or boards rather than sealant
If in doubt, phone 01277 525 020 or send details through our quote form and we’ll say what we think before you book.
Where we work in Chells
- Linear gaps at wall heads
- Service gaps in risers
- Pipe penetrations
- Joints between fire-resisting walls and floors
- Small duct penetrations where the tested detail allows
- Cable penetrations
Fire stopping in Chells: the local picture
Chells lies roughly 29 miles out from central London. Offices around the capital are refitted often, and the cabling that follows can breach fire-resisting walls. There are several hotels within about 2 miles of Chells. Hotels are divided into compartments, and refurbishments that add pipes and cables through bedroom and corridor walls leave gaps to close.
For a site team at a college like North Hertfordshire College - Stevenage Campus, 1.7 miles to the south-west of Chells, fire-rated sealing is best scheduled after the summer works. Shop fits on retail sites such as Monkswood Retail Park (to the south-west of Chells) can bring new services through fire-resisting walls between units, to be sealed with the specified product.
Chells is about 1 mile east of Stevenage, in Hertfordshire. We cover Chells, with the same fixed quotes and 12-month guarantee as everywhere else. 371 places across Hertfordshire fall within our area, including Chells. London is covered too, some 29 miles away.
We cover the SG2 and SG1 postcode districts. If your site is on Scott Road, Eliot Road and Newton Road or close by, we can quote for service penetrations. Close to Chells, our area also takes in Stevenage (1 mile west), St Nicholas (1 mile north-west), Pin Green (1 mile west), Aston End (1 mile south-east) and Bedwell (1 mile south-west). Further afield, our area takes in St Albans (13 miles south-west), Bishop's Stortford (14 miles east), Welwyn Garden City (8 miles south), Harpenden (10 miles south-west), Hitchin (5 miles north-west) and Hoddesdon (13 miles south-east).
Around Chells
In Chells, that means premises near Lodge Farm Primary School. The nearest railway station is Stevenage station, roughly 1.8 miles south-west of the centre. Well-known places in the area include Lister Hospital (2.1 miles north-west) and Benington Castle (2.4 miles south-east). For a walk, there’s Pryor's Wood.
Leave it or put it right?
Fire stopping is a regular point raised at inspections and handover. Late discoveries can delay handover while openings are reopened and resealed which is why earlier is better. Small buildings around Chells suffer from failed joints as much as large ones. Catching it early means a reseal rather than repairs.
Access often affects the price as much as the sealing: joints within easy reach take less time than ones that need access equipment. Mention the access as part of your enquiry.
Why us?
- Specification-led, product-correct work
- Over 20 years of commercial sealing
- Workmanship guaranteed for 12 months
- Fully insured, including public liability cover
Read what affects the cost and how we’re accredited.
FAQs: Chells
How does the removal of BS 476 from Approved Document B affect fire-rated sealing in Chells?
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.
Can work at a site such as North Hertfordshire College - Stevenage Campus fit around teaching?
Yes. Education sites usually want the work in vacations or in phases during term, and we plan to suit. Tell us which site documents you need, such as RAMS, our insurance certificate or CSCS details, and they’re confirmed with the quote.
How long does a typical visit take?
The duration is planned around your programme and the access we’re given. You’ll have an expected duration with the quote.
Do you take on multi-site work?
Yes. A group of buildings can go on one quote, with one point of contact.
Is any job too small?
Small jobs are welcome alongside larger packages. Send details for a fixed quote.
Is your workmanship covered by a guarantee?
Yes. It runs for twelve months and covers how we prepared and sealed the joints, though not damage or work by other trades.
Can you work to our specification?
Yes. Include it with the drawings when you ask for a quote, and we’ll price the work to it, flagging anything that needs clarifying.
On site: what to expect
The first thing on site is a walk round with your contact, agreeing which joints are in scope, where to start and what must stay open. Then we strip out anything that has failed, prepare every joint and seal it. Work in places the size of Chells is planned as a single visit where we can. Photos with rough sizes let us arrive with everything needed.
- First we go through the drawings, schedule or specification for the seals and ask about anything unclear.
- 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.
- Mineral wool or other backing goes in wherever the detail asks.
- 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.
Getting the site ready
- Let building users know which areas are affected
- Have the specification and drawings to hand
- Agree which areas must stay open
Quotes
A handful of photographs and a postcode is the fastest way to a quote. Upload them with the quote form, or ring 01277 525 020 or send photos by email to discuss it first.