Fire-rated sealing and fire stopping in Marshalswick, Hertfordshire
Fire stopping for Marshalswick, from a contractor working since 2005. Fully insured, with a 12-month guarantee.
- Openings left by services added after handover
- Penetration schedules that need working through
- Damaged fire seals in risers and voids
Fire stopping near Marshalswick
Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.
Why it’s worth doing now in Marshalswick
Leave a penetration open and smoke and fire can cross into the next compartment far earlier than intended. 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. For buildings in places like Marshalswick, one well-planned visit beats several small ones, so it’s worth dealing with every failing joint at once.
The price depends on how many linear metres there are, what has to come out first and the access. Call for a fixed quote when you are ready.
What you get with us
- Workmanship guaranteed for 12 months
- CHAS accredited contractor
- Fully insured
- Over 20 years of commercial sealing
Read what affects the cost and how we’re accredited.
Fire stopping in Marshalswick
Our applicators are CSCS-carded, and we are CHAS accredited and a Constructionline member. We don’t hold a third-party fire-stopping installer certificate, and we won’t pretend otherwise. We install the specified fire-rated sealant to its tested detail, and our workmanship carries a 12-month guarantee. If you have expanding foam used as fire stopping and service penetrations left open after M&E works, we can help. Sealant applicators who only do sealant are a different proposition from a general trade with a gun in the van: on jobs in Marshalswick, preparation and product choice get the time they need.
Converted and extended buildings around places like Marshalswick can mix old and new construction, so it’s worth confirming the wall or floor type before choosing the seal. We match the product to the substrate and service, and say so if a collar, wrap or batt is the specified item.
We stand by our work: 12 months, guaranteed. That covers our preparation and application, and if something we did falls short, we return to it.
- Location
- Marshalswick (AL4, AL1, AL3)
- Region
- Hertfordshire
- Guarantee
- 12 months on our workmanship
- Price
- Quoted before any work starts
- Telephone
- 01277 525 020
- Page updated
- 3 November 2026
Diagnose, treat, sign off
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. After that, any old or failed material is removed, each joint is prepared and the new sealant goes in. Work in places the size of Marshalswick is planned as a single visit where we can. Clear photographs and measurements help us bring the right products.
- We ask for the product and detail your designer has specified.
- We sort the openings by the detail each one needs.
- Improvised fillers and failed sealant are removed.
- Mineral wool or other backing is fitted where required.
- We gun the sealant in to the specified depth around each service and tool it.
- Completed areas are checked with you, with the records agreed when we quoted.
Before we start on site
- Let us know about inductions and permits
- Let building users know which areas are affected
- Explain the parking and delivery arrangements
Request a quote
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 call 01277 525 020 or email drawings and photos.
Read more
What sealant work can’t fix
We seal joints; we don’t mend everything behind them. Sealant alone won’t deal with:
- Deciding what a wall or floor needs, which belongs to the designer
- Walls or floors that aren’t fire-resisting to begin with
- Signing off or certifying a building’s fire stopping
If in doubt, call 01277 525 020 or email a schedule or drawings and we’ll say what we think before you book.
Joints and surfaces we work on
- Linear gaps at wall heads
- Pipe penetrations
- Service gaps in risers
- Joints between fire-resisting walls and floors
- Cable penetrations
- Small duct penetrations where the tested detail allows
What the job involves on each surface
Plastic pipes
Plastic waste pipes through slabs come up often. The detail decides whether sealant alone is enough.
Drylining partitions
Plasterboard partitions are tested as a specific construction. The sealant detail has to be tested in that wall type, with the stated board layers before sealing.
Fire stopping around Marshalswick: points for this area
Central London is about 21 miles from Marshalswick. Office refits around the commuter belt bring new cabling through fire-resisting walls. The area within 2 miles of Marshalswick holds plenty of hotels. A hotel refit often runs new services through compartment walls between bedrooms and corridors, and each opening needs the specified seal.
In a retail centre such as Village Arcade St Albans, 1.7 miles to the south-west of Marshalswick, any fire-resisting wall between units that is crossed by new services needs sealing to the tested detail. Residences at universities like University of Hertfordshire (2.8 miles east of Marshalswick) have compartment walls that must be resealed whenever services change. Workshops and IT rooms at colleges like Oaklands College (1.1 miles south-east of Marshalswick) are re-serviced often, leaving penetrations to seal.
Marshalswick is about 1 mile north-east of St Albans, in Hertfordshire. Anywhere in AL4, the process is the same: details in, fixed quote out, then sealing and a 12-month guarantee. Marshalswick is one of 371 places in Hertfordshire on our list. There’s a separate page for London, roughly 21 miles from Marshalswick.
If you need fire stopping in AL4, AL1 and AL3, the process matches everywhere else we work: send details, get a quote, we seal, guaranteed. For a building on Milvus Road, Jersey Lane and Sandpit Lane or nearby, we can quote for service penetrations. Just outside Marshalswick, we also work in Sandridge (1 mile north), Bernards Heath (1 mile west), St Albans (1 mile south-west), Childwick Green (2 miles north-west) and Sopwell (2 miles south-west). Further afield, our area takes in Watford (8 miles south-west), Hemel Hempstead (7 miles west), Stevenage (11 miles north-east), Welwyn Garden City (5 miles north-east), Harpenden (4 miles north-west) and Hitchin (13 miles north).
What’s near Marshalswick
Locally, jobs take us to sites close to The Baton pub, Sandringham School and Clarence Park and the streets around them. The nearest railway station is St Albans station, about 1.3 miles south-west of the centre. Well-known places in the area include St Albans Musical Museum (0.8 miles south-west) and The Maltings (1.6 miles south-west). The countryside around Marshalswick includes The Wick Local Nature Reserve and Verulamium Lake.
How the quote is worked out
To price the job, we consider:
- Any access equipment needed
- Site requirements such as inductions and permits
- Backing rod, priming and other preparation
- Whether old sealant has to be cut out first
Whether it’s a single area or a whole estate, the same things set the price: what’s in scope, how we reach it, what’s specified and when it needs doing. Call for a quote, and you will have a fixed figure to work with.
Before you send an enquiry
To price the job accurately, we need a clear picture of the site. Useful things to include:
- Your programme or deadline
- Whether the building will be occupied during the work
- Any specification or named product
- Photos of the joints, close up and from further back
We quote a fixed sum against the scope you give us, so you know the figure before anyone is on site. To start the process, call 01277 525 020 or email drawings and photos.
Towns and villages near Marshalswick
Also in Marshalswick
Marshalswick: questions and answers
Will you plan work around the academic year at somewhere like University of Hertfordshire?
Yes. Education sites typically 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.
Is a smaller place like Marshalswick outside your area?
Not at all: smaller places are covered as well as towns. We cover Greater London and the counties of the South East. Send photographs and a list of what needs doing, and we will plan the job to need as few trips as possible.
Do you have third-party installer accreditation for fire stopping?
No. We are not members of a third-party fire-stopping installer scheme. We are CHAS accredited and a Constructionline member, and our applicators are CSCS-carded. Where a client or main contractor requires a scheme member, we’ll say so straight away rather than waste your time.
Do you seal on top of existing sealant?
No. Sealing over old material is one of the classic causes of early joint failure, so everything comes out first.
What changes on 2 September 2029?
It mainly affects England, where Approved Document B is dropping its BS 476 references from 2 September 2029. Products are then judged on BS EN 13501-2 classifications, subject to transitional arrangements. Scotland follows its own Technical Handbook.
Will fire-rated sealant work on every penetration?
No. It depends on the tested detail for that wall or floor and service. Large openings, many plastic pipes and some ducts need collars, wraps, batts or boards.
When can the area be used after sealing?
Curing time varies by product, and we confirm it on the day.
Maintenance after handover
Once the work is signed off, these steps help:
- Get seals inspected before ceilings and boxing close
- Record which product was used where
- Ask which product is in place before decorating
- Keep general-purpose fillers away from compartment walls
During planned inspections, look at seals in risers, cupboards and voids. Watch for cracked sealant, new services with no seal and openings that have grown, and report them promptly.
Keep a register of where seals are and what they are made of. It tells the next contractor exactly what to reinstate, and it helps at inspections.