Pin Green fire stopping
Fire-rated and intumescent sealing of service penetrations and linear gaps across Pin Green, carried out by CSCS-carded applicators. CHAS accredited and fully insured.
- Fire stopping installed outside its tested range
- Unsealed joints where partitions meet the slab
- Hidden openings found during inspections
Fire stopping across Pin Green
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
Cost factors for service penetrations
Each job is priced on its own details. The things that drive the figure:
- How accessible the joints are
- Backing rod, priming and other preparation
- How much there is to seal
- Which sealant the job calls for
A quote for service penetrations depends on how many there are, their condition and the access. Ask us for a fixed quote.
What to include in your enquiry
The more we know, the firmer the quote. Helpful details to send:
- Whether the building will be occupied during the work
- Whether an asbestos survey exists
- Photos of the joints, close up and from further back
- Access details, including height
To get a fixed quote, give us a call on 01277 525 020 or email the details over, telling us the site location and the nature of the job. Our quote form is another easy route.
Fire stopping in Pin Green
Opened ceilings and riser doors often reveal service openings nobody sealed. If a specification already covers those walls and floors, we can reseal to it. With no specification in place, the first step sits with your designer or fire engineer, not with us. If you’re dealing with fire-stopping items raised at inspection or handover and unsealed openings around new pipes and cables, we can help, on small duct penetrations where the tested detail allows, cable penetrations and linear gaps at wall heads alike. Looking for mastic applicators who cover Pin Green? We’ve been sealing commercial buildings since 2005.
Around Pin Green, penetration and linear seals tend to be one-building jobs. With the specification and photographs of the gaps, we can give a fixed quote and bring the right products.
A 12-month guarantee applies to all our work. If an installation problem shows up, give us a call on 01277 525 020 or use the quote form and we’ll arrange a return visit.
- Where
- Pin Green (SG1, SG2)
- Region
- Hertfordshire
- Guarantee
- 12 months on every job
- Quote
- A fixed quote before we start
- Telephone
- 01277 525 020
- Last updated
- 3 November 2026
Diagnose, treat, sign off
We follow your site rules from the start: signing in, inductions and any permit to work. With the paperwork done, the joints are worked through in the order agreed with your site contact. What matters most for a job in Pin Green is a clear list of what needs doing. A fixed quote follows.
- We read the specification, drawings or penetration schedule you send.
- 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.
- Fire-rated or intumescent sealant is gunned in to the specified depth, then tooled.
- If an opening needs something other than sealant, we tell you instead of improvising.
Getting the site ready
- Send any specification or drawings in advance
- Tell us which areas need to stay in use
- For older buildings, check the asbestos register before work
Request a quote
If there’s a specification, drawings or a tender package, send it with your enquiry, and we will price against exactly what is specified. For smaller jobs, photographs and a description will do.
Read more
Nearby places to Pin Green
Also in Pin Green
Commercial clients in Pin Green
Hospitality, education, healthcare, office and retail clients book us directly too. The work is planned around how the building runs, so guests, pupils, patients or staff are disturbed as little as possible.
Main contractors use us as their sealant subcontractor. We work to your programme, your specification and your site rules, and our applicators hold CSCS cards.
Surface by surface
Metal pipes
Heat travels along metal pipework. If the detail needs something beyond sealant, we tell you.
Cables and cable bundles
Single cables and small bundles are often within a fire-rated sealant’s tested detail. Bundle size, cable type and the space between cables all matter.
Common questions from Pin Green clients
Is Pin Green too far out for you?
No. Places such as Pin Green are covered as much as the big towns. We work across Greater London and the South East. Good photographs up front let us bring everything on the first visit.
How does the move away from BS 476 affect penetration seals in Pin Green?
From 2 September 2029, Approved Document B drops its BS 476 references in favour of BS EN 13501-2 classification, with transitional arrangements. The designer or fire engineer sets the specification, and we install the product to the manufacturer’s tested detail.
Do you offer coloured sealant?
In many cases, yes. Sealants are made in a wide range of standard colours, and matching to RAL references or nearby finishes is commonly requested. We’ll confirm the colours available for the specified product.
Are you insured?
Yes. Mastic Doctor is fully insured, public liability included.
Do you work to architects’ specifications?
Yes. Send it with your enquiry, and the quote will be based on it.
How many days will you need on site?
It depends on the scope, but the work usually takes longer where risers, ceiling voids or occupied floors have to be worked through in sequence. Larger or phased jobs take longer, and we’ll give you a timescale with the quote.
Does weather matter for sealant work?
It can, for external work. Wet joints and cold, damp or frosty conditions stop the sealant bonding properly, so we watch the forecast and rearrange outside work if we have to. Indoors, the weather is rarely a problem.
Aftercare for building managers
Once the work is signed off, these steps help:
- Settle who seals which penetrations at the start of a project
- Have penetrations checked while they can still be seen
- Foam or ordinary sealant is never a fire-seal repair
- Check with the data sheet before painting over fire sealant
Give the sealant its full cure time before ceilings, boxing or decoration go over it. Some fire-rated sealants accept paint and some don’t, so check the product data first.
Write fire stopping into the scope of any work crossing a compartment wall or floor. That way the opening is sealed while the trade and access are still there instead of being left for someone else.
Penetration seals near Pin Green
A 2-mile radius around Pin Green 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. Pin Green is part of, or right next to, Stevenage, which was built as a planned town. Offices and public buildings from that era have typically had several generations of new services, and every change can breach a fire-resisting wall.
Older community buildings such as Church of Saint Nicholas that have been rewired or given new heating can have service gaps through walls worth checking against the specification. Shop fits on retail sites such as Monkswood Retail Park, 1.4 miles to the south of Pin Green, can bring new services through fire-resisting walls between units, to be sealed with the specified product. Hospital estates such as Lister Hospital, 1.3 miles north-west of Pin Green, are divided into fire compartments, and any service penetration through them should be sealed to the specified, tested detail.
Pin Green is about 1 mile north-west of Stevenage, in Hertfordshire. Any commercial site in Pin Green is covered, whether it’s a single job or part of a planned programme. Pin Green is one of 371 places in Hertfordshire on our list. We also cover London, some 29 miles away.
We cover the SG1 and SG2 postcode districts for service penetrations. We cover commercial and managed buildings on Lines Road, Hawkes Lane and Aldock Road and the roads nearby. Close to Pin Green, our area also takes in Stevenage (1 mile south-east), Bedwell (1 mile south), Rooks Nest (1 mile north), St Nicholas (1 mile north-east) and Chells (1 mile east). A short drive away, we cover St Albans (13 miles south-west), Bishop's Stortford (15 miles east), Welwyn Garden City (8 miles south), Harpenden (10 miles south-west), Hitchin (4 miles north-west) and Hoddesdon (13 miles south-east).
Near you in Pin Green
Around Pin Green, our work takes us to commercial buildings near The Barclay School, The Standing Order pub and The John Henry Newman School, among other places. For rail, the closest station is Stevenage station, roughly 1.1 miles south-west. A little further out are Wymondley Castle (2.7 miles north-west) and Lister Hospital (1.2 miles north-west). For a walk, there’s Pryor's Wood.
What we can’t put right
We seal joints; we don’t mend everything behind them. On its own, sealant can’t deal with:
- Reviewing a building’s overall fire safety
- Signing off or certifying a building’s fire stopping
- Designing or specifying fire stopping, which sits with the designer or fire engineer
Not sure which it is? You can phone 01277 525 020 or email us and we will tell you honestly.
Joints and surfaces we work on
- Small duct penetrations where the tested detail allows
- Service gaps in risers
- Cable penetrations
- Joints between fire-resisting walls and floors
- Pipe penetrations
- Linear gaps at wall heads