Fire-rated sealing and fire stopping in Green Street, Hertfordshire
Fire-rated and intumescent sealing of service penetrations and linear gaps throughout Green Street and nearby, by CSCS-carded applicators. Fully insured and CHAS accredited.
- Fire-rated sealant that has cracked or shrunk back
- Fire stopping installed outside its tested range
- Unsealed openings around new pipes and cables
Fire stopping in Green Street
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
How we handle fire stopping in Green Street
The test standards are BS EN 1366-3 for penetration seals and BS EN 1366-4 for linear joints and the results are classified to BS EN 13501-2. A rating such as EI 60 only holds when the product is installed as it was tested. Reproducing the tested arrangement on site is the part we take care of. We work on service gaps in risers, linear gaps at wall heads and cable penetrations, and the failures we’re asked to look at most are open linear gaps along the top of fire-resisting walls and non-fire-rated filler around services. For commercial sealant work in Green Street, you deal with one contact from quote to sign-off, for single jobs and planned programmes alike.
A job near Green Street is usually planned around one visit, so send the specification and photographs first. We install to the specification and the manufacturer’s guidance, leaving design and sign-off with the designer and building control.
Work we carry out comes with a 12-month guarantee. If an installation problem shows up, ring 01277 525 020 or email drawings and photos and we’ll arrange a return visit.
- Where
- Green Street (WD6)
- Wider area
- Hertfordshire
- Cover
- 12 months on our workmanship
- Quote
- A fixed quote before we start
- Call
- 01277 525 020
- Last updated
- 3 November 2026
Quoting for work in Green Street
To price the job, we consider:
- The total length or number of joints
- Induction, permit and paperwork requirements
- The size and state of each joint
- Phasing around occupants
The specified product makes a difference, as does the preparation each joint needs, from cutting out to priming and backing rod. Access, phasing and site requirements come into it too.
Details that help us quote
It doesn’t need to be a full survey. These details are enough to start:
- Rough lengths or quantities, or drawings if you have them
- The postcode of the building
- Whether an asbestos survey exists
- How the joints are reached, and at what height
Every quote starts with the facts: what’s there, how much of it, how we reach it and what’s specified. Share whatever details you have and we’ll fill any gaps with a visit.
When something else is needed
Some faults sit outside our scope, and we say so rather than covering them up:
- Approving the work on behalf of building control
- Deciding what a wall or floor needs, which belongs to the designer
- Reviewing a building’s overall fire safety
Not sure which it is? You can ring 01277 525 020 or email us and we’ll tell you honestly before you book.
Where we work in Green Street
- Cable penetrations
- Service gaps in risers
- Joints between fire-resisting walls and floors
- Small duct penetrations where the tested detail allows
- Linear gaps at wall heads
- Pipe penetrations
Compartment walls and floors in Green Street
Central London is about 14 miles from Green Street. Office refits around the commuter belt bring new cabling through fire-resisting walls; the gaps need the specified seal. There are two care or nursing homes within about 2 miles of Green Street. In a care home, any new pipe or cable through a fire-resisting wall should be sealed to the specified detail.
At a healthcare site like Kingsley Green Hospital (2.4 miles north-west of Green Street), new services through compartment walls are a constant, and each needs the specified seal. In a school such as Parkside Community Primary School, fire-rated sealant goes in around service penetrations where it is specified.
Green Street is about 1 mile north of Borehamwood, in Hertfordshire. Any commercial site in Green Street is covered. Our Hertfordshire coverage takes in 371 places, from busy centres to rural villages. For work in that direction, see our London page (14 miles or so).
We cover the WD6 postcode districts. We cover commercial and managed buildings on Stapleton Road, Green Street and Cowley Hill and the roads nearby. Nearby places we also cover include Well End (1 mile south-east), Borehamwood (1 mile south), Shenley (1 mile north-west), Ridge (2 miles north-east) and Rowley Green (2 miles south-east). A short drive away, we cover Watford (5 miles west), Hemel Hempstead (10 miles north-west), St Albans (6 miles north-west), Welwyn Garden City (9 miles north), Harpenden (10 miles north) and Hoddesdon (12 miles north-east).
What’s near Green Street
Recent enquiries here include premises near The White Horse Public House and Hertswood Academy and the streets around them. The closest station to Green Street is Elstree & Borehamwood station, about 1.6 miles south. Nearby you’ll also find Hilfield Castle (3 miles south-west) and Shenley Hospital (1.6 miles north-west). The countryside around Green Street includes Darland's Lake and Arkley Lane and Pastures.
Building owners, agents and FMs in Green Street
As a CHAS accredited contractor and Constructionline member, we are straightforward to vet for your supplier list. We are fully insured, and our insurance certificate can go with the quote.
For main contractors, we work as the sealant subcontractor. We work to your programme, your specification and your site rules, with CSCS-carded applicators on site.
From enquiry to 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. Then we strip out anything that has failed, prepare every joint and seal it. Rural sites near Green Street may need directions, gate codes or a contact on site. Send that with the details and we’ll confirm the plan with the quote.
- We read the specification, drawings or penetration schedule you send 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.
- 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.
What we need from you
- Explain the parking and delivery arrangements
- Flag any permit to work we will need
- Tell us which areas need to stay in use
Request a quote
Send details, get a quote, we seal, guaranteed: that’s how every job runs. To take the first step, ring 01277 525 020 or send photos by email.
Advice
Questions we are asked in Green Street
Can you seal around new services in a hotel near Green Street?
Yes, where the specification calls for fire-rated sealant. We match the product to the wall or floor and the services, and say if something other than sealant is needed.
Does your area include sites such as Borehamwood Industrial Park, near Green Street?
Yes, sites like Borehamwood Industrial Park are within our area, along with the rest of Green Street. Send details of the unit and the work through our quote form for a quick quote.
What about RAMS and site documents?
Each site asks for different documents, so tell us what you need and we’ll confirm it when we quote.
Are you CHAS accredited and on Constructionline?
Yes. Mastic Doctor is CHAS accredited and a Constructionline member.
Can staff carry on working while you’re here?
Normally, yes. Phased work can be planned so areas stay in use.
Can you fit around our working hours?
Mention the site’s hours and access windows in your enquiry, and we will plan around them. You can reach the office between 8am and 5pm, Monday to Friday.
How do we ask for a quote?
The quote form is the simplest route, though you can also call the office on 01277 525 020 or email a schedule or drawings. Photos, drawings or a joint schedule help us quote quickly.
Towns and villages near Green Street
Also in Green Street
General trades versus a specialist
Site maintenance staff can often handle a short internal joint. The usual problems come from preparation: new sealant over old, damp or dusty faces, or the wrong product for the movement.
Some joints are best left to specialists: fire-rated seals that must follow a tested detail, trafficked floor joints and external movement joints among them. Getting these wrong usually costs more in the end than doing them right.
Common problems we fix in Green Street
A common fault is a product that was never fire-rated in the first place: builders’ foam or ordinary silicone used to fill a hole. It may look closed, but it has no tested fire performance in that position.
What tends to prompt an enquiry:
- Unsealed joints where partitions meet the slab
- Seals disturbed by maintenance and left open
- Openings found when ceilings come down for a refit
- Service penetrations left open after M&E works
For a unit at a site such as Borehamwood Industrial Park, 1.2 miles to the south-east of Green Street, new power or data runs between office and warehouse can breach a compartment wall.
What to look for in a quote
- Their public liability cover
- Whether primer will be used where the manufacturer specifies it
- Their approach to joint depth and backing
- Will failed sealant be removed rather than covered?