Fire Stopping in Old Knebworth
We carry out fire-rated and intumescent sealing of service penetrations and linear gaps in Old Knebworth. Send photos or drawings for a fixed quote.
- Hidden openings found during inspections
- Non-fire-rated filler around services
- Penetration schedules that need working through
Fire stopping across Old Knebworth
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
Fire stopping in Old Knebworth: the local picture
Approved Document B is the English guidance that covers fire stopping around openings and penetrations. Its BS 476 references are being withdrawn from 2 September 2029, with BS EN 13501-2 classification taking over, subject to transitional arrangements. What we install is set by the specification, and it goes in to the tested detail. Central London is about 26 miles from Old Knebworth. Offices around the capital are refitted often, and the cabling that follows can breach fire-resisting walls, and the gaps need sealing with the specified product.
On a site such as Arlington Business Park (1.3 miles north of Old Knebworth), every fit-out that runs new services through a compartment wall leaves penetrations to seal with the specified product. Colleges such as North Hertfordshire College - Stevenage Campus (1.8 miles north of Old Knebworth) add IT and services as courses change, and each new penetration through a fire-resisting wall needs sealing with the specified product. Halls and meeting rooms at places like Church of St Mary and St Thomas sometimes gain new services, and any compartment wall crossed needs the specified seal.
Old Knebworth is about 3 miles south-west of Stevenage, in Hertfordshire. Across the SG3 postcode area, it works the same way: send details, get a fixed quote, we seal, and the work is guaranteed. Old Knebworth is one of 371 places in Hertfordshire on our list. Our London page has more on work in that area (26 miles or so).
We take on service penetrations across the SG3 postcode area, whatever the building. Among the streets we cover are Old Knebworth Lane and Park Lane. Close to Old Knebworth, our area also takes in Nup End Green (1 mile south-west), Driver's End (1 mile south-west), Rableyheath (1 mile south), Pottersheath (1 mile south) and Langley (2 miles north-west). Further afield, our area takes in Hemel Hempstead (13 miles south-west), Stevenage (3 miles north-east), St Albans (10 miles south-west), Welwyn Garden City (5 miles south), Harpenden (7 miles south-west) and Hitchin (6 miles north-west).
What’s near Old Knebworth
We work on buildings around Knebworth Park and Robin Hood And Little John Public House. The closest station to Old Knebworth is Knebworth station, about 1 mile east. A little further out are Lister Hospital (3.7 miles north) and Stevenage Museum (2.2 miles north). For a walk, there’s Mardley Heath.
Fire stopping in Old Knebworth, done properly
Fire-rated sealant suits many small service penetrations: copper and steel pipes, cables and some small ducts where the tested detail allows. Other openings need collars, wraps, batts, pillows or boards. If the detail calls for something other than sealant, we say so rather than force sealant into it. We work on small duct penetrations where the tested detail allows, joints between fire-resisting walls and floors and service gaps in risers, and the usual reasons a site gets in touch are openings left by services added after handover and old intumescent sealant that has split away. Facilities teams, main contractors and managing agents in Old Knebworth tend to want the same three things: a fixed quote, no surprises on site and a 12-month guarantee behind the result.
Smaller places such as Old Knebworth 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.
Every job we finish is backed by a 12-month workmanship guarantee, wherever the site is. If our installation lets you down in that time, we return and fix it.
- Location
- Old Knebworth (SG3)
- Region
- Hertfordshire
- Guarantee
- 12 months on our workmanship
- Price
- A fixed quote before we start
- Phone
- 01277 525 020
- Last updated
- 3 November 2026
What sealant work can’t fix
Before quoting, we check that sealant is the right answer. It won’t put right:
- Large openings beyond what any sealant detail covers
- Deciding what a wall or floor needs, which belongs to the designer
- Walls or floors that aren’t fire-resisting to begin with
Not sure which it is? You can call the office on 01277 525 020 or send details through our quote form and we will tell you honestly before you book.
Where we work in Old Knebworth
- Small duct penetrations where the tested detail allows
- Service gaps in risers
- Joints between fire-resisting walls and floors
- Linear gaps at wall heads
- Cable penetrations
- Pipe penetrations
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. Halls, stores and units around places like Old Knebworth may not be checked every day, so a failed joint can leak for a while before anyone sees it. Resealing early avoids that.
A quote for service penetrations depends on how many there are, their condition and the access, and any specification that applies. Call for a quote.
What you get with us
- Joints cleaned back to sound surfaces
- Work to your specification and the manufacturer’s guidance
- One number for every site we cover
- Public liability insurance in place
Read what affects the cost or our accreditations and insurance.
How a job runs
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 the next one starts. Smaller jobs around Old Knebworth can be grouped with others nearby. You’ll have a fixed quote before work starts.
- 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.
- Unsuitable fillers and loose debris are taken out of each opening.
- 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.
Preparing the site
- Share your working hours and any access restrictions
- Clear stock, furniture or equipment away from the joints
- Point out any areas we must not close
Get a fixed quote
Send details, get a quote, we seal, guaranteed: that’s how every job runs. To take the first step, call the office on 01277 525 020 or send photos by email.
Read more
Nearby places to Old Knebworth
Other services in Old Knebworth
After the work
Once the work is signed off, these steps help:
- Report damaged or disturbed seals as soon as they’re spotted
- Get seals inspected before ceilings and boxing close
- Brief every trade that openings they make must be sealed
- Include service cupboards in routine inspections
Keep the product data and installation details with the building’s fire safety information. Anyone resealing later needs to know which product and detail were used.
Regular walk-rounds of service areas are worth the time. Catching a damaged seal early keeps the fix small compared with dozens found at once.
Quoting for work in Old Knebworth
What shapes the price:
- Joint width, depth and condition
- Induction, permit and paperwork requirements
- Phasing around occupants
- Specialist products, such as fire-rated or hygienic sealants
Access often affects the price as much as the sealing: joints within easy reach take less time than ones that need access equipment. Tell us how the joints are reached and call for a quote.
What to include in your enquiry
Whether it’s one area or a whole building, the same details help:
- Specification clauses that apply
- When you need the work done
- Asbestos survey details if the building is older
- The site address and postcode
Let us know the site, the scope and your timescale, and we’ll put a fixed quote together. To get it moving, call 01277 525 020 or send photos by email.
How the job changes by surface
Plastic pipes
Plastic pipes soften and collapse in a fire. Some intumescent sealants are tested on smaller plastic pipes, but many need a collar or wrap. We check the pipe material and diameter against the detail before we start.
Risers and ceiling voids
Openings above suspended ceilings are easy to miss. We work through the areas on your schedule methodically and tell you about openings outside the list.
Questions about Old Knebworth
Can you work around term dates at a campus such as North Hertfordshire College - Stevenage Campus?
Yes, holiday working periods are the norm on campus jobs. Any paperwork you need, from RAMS to our insurance certificate and CSCS details, is confirmed with the quote.
Is Old Knebworth too small for you to travel to?
Not at all: smaller places are covered as well as towns. London and every South East county are within our area. Send photographs and a list of what needs doing, and we’ll plan the job to need as few trips as possible.
Will you write the fire-stopping specification?
No. Deciding what is needed sits with the designer, fire engineer and building control. Our role is fitting the specified fire-rated sealant, following the maker’s tested details.
Can the sealant be colour-matched?
That depends on the product specified. Some ranges are wide, others limited, so we’ll confirm the colours available for the specified product with the quote.
What happens if old sealant might contain asbestos?
The duty to manage asbestos sits with the building’s dutyholder, so for older buildings we ask for the asbestos register first. If anything suspect turns up, we stop until it’s tested.
Are you fully insured?
Yes. We are fully insured, and the certificate can go with your quote.
Do you hold third-party fire-stopping installer certification?
No, and we won’t imply otherwise. Third-party schemes aren’t a legal requirement, but many clients and main contractors ask for them. If it doesn’t require one, we can install the specified fire-rated sealant to its tested detail.