Fire stopping in Colliers End
Fire-rated and intumescent sealing of service penetrations and linear gaps in Colliers End. CHAS accredited and fully insured, with a 12-month guarantee.
- Expanding foam used as fire stopping
- Damaged fire seals in risers and voids
- Openings found when ceilings come down for a refit
Fire stopping for businesses in Colliers End
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
Keeping the joints sound
Regular inspection catches problems early. Specifically:
- Treat an open penetration as a priority repair
- Foam or ordinary sealant is never a fire-seal repair
- Keep product data and details in the fire safety file
- Check with the data sheet before painting over fire sealant
Once the seals are in, tell other trades they exist and must not be disturbed. Any seal cut back for a new service needs reinstating to its tested detail.
The simplest way to keep compartment walls intact is to plan fire stopping into every job that crosses them. That way the opening is sealed while the trade and access are still there.
Fire stopping in Colliers End, done properly
Fire-rated sealant suits many small service penetrations: copper and steel pipes, cables and some small ducts where the tested detail allows. Larger openings and some plastic pipes call for collars, wraps, batts or boards instead. We use sealant where it is the specified product, and we tell you when a detail calls for something else. If you’re dealing with unsealed openings around new pipes and cables and fire stopping installed outside its tested range, we can put it right, on joints between fire-resisting walls and floors, linear gaps at wall heads and cable penetrations alike. A single leaking joint is often how a building in Colliers End first comes to us: we look at the rest while we are there and tell you what we find.
Barn and farm-building conversions near places like Colliers End often combine new partitions with old walls. Where a pipe or cable passes through a fire-resisting wall, the seal must match the tested detail: product, substrate, gap and depth.
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.
- Place
- Colliers End (SG11)
- Region
- Hertfordshire
- Guarantee
- 12 months on our workmanship
- Price
- Quoted before any work starts
- Call
- 01277 525 020
- Updated
- 3 November 2026
When something else is needed
Honesty saves time and money. Fresh joints won’t solve:
- Fire risk assessments, a job for a competent assessor
- Signing off or certifying a building’s fire stopping
- Designing or specifying fire stopping, which sits with the designer or fire engineer
If in doubt, call the office on 01277 525 020 or email drawings and photos and we will say what we think.
Joints and surfaces we work on
- Cable penetrations
- Service gaps in risers
- Joints between fire-resisting walls and floors
- Pipe penetrations
- Small duct penetrations where the tested detail allows
- Linear gaps at wall heads
What the job involves on each surface
Masonry and concrete
Many seals are made in blockwork, brickwork or concrete slabs. Dust and loose debris are cleared out of the opening, with backing added if the detail requires it.
Small ducts
We seal around ducts only within what the tested detail covers. Dampers and ductwork systems themselves are outside our work.
On site: what to expect
Our CSCS-carded applicators arrive with the sealants, primers and backing rod the job calls for. Any old material is cut back to clean, sound faces, the manufacturer’s primer is applied where it’s called for, and the sealant is tooled off neatly. Rural sites near Colliers End may need directions, gate codes or a contact on site. Add it to your enquiry and we will build it into the plan.
- First we go through the drawings, schedule or specification for the seals and ask about anything unclear.
- On site, each opening is checked against the tested detail it is meant to follow.
- 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.
- Openings that need a collar, wrap, batt or other product are flagged to you rather than filled with sealant.
Preparing the site
- Move anything stored against the joints
- Have the specification and drawings to hand
- Tell staff and tenants when we will be in
Getting a fixed quote
Need a figure for a tender or a budget? Send the scope and any drawings, and we will return a fixed quote that you can work with. For a chat about it beforehand, call the office on 01277 525 020 or email a schedule or drawings.
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Towns and villages near Colliers End
More services for Colliers End
Compartments and services around Colliers End
For England, the fire stopping of penetrations is dealt with in Approved Document B. Its BS 476 references are being withdrawn from 2 September 2029, with BS EN 13501-2 classification taking over, subject to transitional arrangements. We install whatever has been specified, to the product’s tested detail. At about 26 miles from central London, Colliers End is within reach of the capital. Business park offices in the commuter belt are refitted as tenants change, and each fit-out adds services through compartment walls.
Hospital estates such as Hertford County Hospital (to the south-west of Colliers End) are divided into fire compartments, and any service penetration through them should be sealed to the specified, tested detail. Halls and meeting rooms at places like St Mary's sometimes gain new services, and any compartment wall crossed needs the specified seal. Tenant changes at parks like Standon Business Park, 1.9 miles north-east of Colliers End, bring new data and services, and openings through fire-resisting walls need the specified seal.
Colliers End is about 4 miles north of Ware, in Hertfordshire. We send applicators to Colliers End for service penetrations. Colliers End is one of 371 places we cover in Hertfordshire. For work in that direction, see our London page (26 miles or so).
Postcode districts covered here: SG11. Nearby places we also cover include Standon Green End (1 mile south-west), Barwick (1 mile south-east), High Cross (1 mile south), Sacombe Green (2 miles west) and Puckeridge (2 miles north-east). Nearby towns on our patch include Stevenage (8 miles west), Bishop's Stortford (7 miles east), Welwyn Garden City (9 miles south-west), Harpenden (15 miles west), Hitchin (13 miles north-west) and Hoddesdon (8 miles south).
Local landmarks in Colliers End
Around Colliers End, our work takes us to commercial buildings near The Lamb and Flag pub and the streets around them. The closest station to Colliers End is Ware station, roughly 4.2 miles south. A little further out are Hertford County Hospital (5.9 miles south-west) and Barrowfield (4.9 miles south). The countryside around Colliers End includes King's Meads.
Colliers End: questions and answers
Do you cover business parks and estates near Colliers End, such as Standon Business Park?
Yes. Our area takes in Colliers End and its surroundings, with estates and business parks such as Standon Business Park included. Photos and a short description are enough for a first look.
What does the BS 476 change mean for fire-rated sealant in Colliers End?
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.
Can one quote cover more than one building?
Yes. Multi-site work and planned programmes are a core part of the service, with each site phased to suit its occupants.
Can you work to our specification?
Yes. Include it with the drawings when you ask for a quote, and we will price the work to it, flagging anything that needs clarifying.
Can the building stay open while you work?
Normally, yes. We phase the work so most of the building stays in use.
Are you fully insured?
Yes. Mastic Doctor is fully insured, public liability included.
Do you offer coloured sealant?
In many cases, yes. Many products come in a range of standard colours, and matching to RAL references or surrounding finishes is often possible. We will confirm the colours available for the specified product.
Building owners, agents and FMs in Colliers End
Building owners and managing agents use us on sealant work across single buildings or whole portfolios around Colliers End. One quote can cover more than one site, which keeps the paperwork simple.
Whether you’re a managing agent, a property factor or an owner’s representative: send the details, accept a fixed quote, and we carry out and guarantee the work. Keys, access and contacts can be agreed in advance.
Why deal with it now?
A seal that doesn’t match its tested detail gives false comfort. Correcting it means cutting it out and starting again with the specified product, so it makes sense to get it right first time. One visit to deal with every failing joint makes more sense than several trips to a place like Colliers End, rather than one at a time. Send photos of each area and we’ll quote for the lot.
Larger quantities, tricky access or phasing all shape the price. Site requirements like inductions and permits play a part as well, along with the time of year for external work.
Why choose Mastic Doctor in Colliers End
- Work to your specification and the manufacturer’s guidance
- Over 20 years of commercial sealing
- Fixed quotes based on photos, drawings or a visit
- A Constructionline member, so easy to vet
Take a look at our cost guide and how we’re accredited.