Hertfordshire · England

Fire-rated sealant in Green Street, Hertfordshire

Specialist fire rated sealant for Green Street: careful preparation, the right product and tidy work. Ask us for a quick quote.

  • Gaps around pipes and cables through fire-resisting walls
  • Door frames with gaps between frame and wall
  • Cracked or shrunken fire-rated sealant

Need fire rated sealant in Green Street?

Landlords, agents and businesses in Green Street

Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can go on one quote.

We also work for property managers and facilities teams. We can quote a run of properties together, and we are fully insured.

Fire rated sealant in Green Street, done properly

Deciding which gaps need fire stopping isn’t our role; that comes from your fire risk assessor, designer or building control. Our part is applying the specified sealant carefully, to the right depth and with the right backing. Common call-outs are for open holes round services passing through fire walls and fire seals that have cracked with movement, on service penetrations, linear gaps and pipe & cable gaps.

For a small place like Green Street, the journey and timings are agreed in advance, so the job can fit around bookings, guests or opening times where possible.

Whatever the size of the job, you get the same one-year guarantee in Green Street and across Hertfordshire.

Eleven members of the Mr Mastic team standing in front of branded white vans
Where
Green Street (WD6)
Wider area
Hertfordshire
Guarantee
A year, on every job
Quotes
A clear quote up front
Phone
0345 464 0079
Last updated
26 October 2026

How the job changes by surface

Service penetrations

Service penetrations are where new gaps often appear. Old or unsuitable filler comes out before the right sealant goes in with backing where the detail needs it.

Door frames

We deal with the gap around the frame, not the door. The door leaf, its seals and closer need a door specialist and we will mention anything we notice.

Looking after it afterwards

How long the joints last depends on use and care. Here’s what we suggest:

  • Flag any open gap you spot round a pipe or cable
  • Make resealing part of every contractor’s brief
  • Do not paint over fire sealant until it has cured
  • Never patch a fire seal with standard sealant

Any fire seal that’s cut or drilled needs resealing to its tested detail. New services through a sealed wall should include fire stopping in the plan.

A gap left open in a fire-resisting wall or floor lets smoke spread in ways the building wasn’t designed for. Closing it is usually a straightforward job.

Fire rated sealant in Green Street: local notes

Workplaces and the common parts of blocks of flats in England need a fire risk assessment under the Regulatory Reform (Fire Safety) Order 2005, and gaps around services are often picked up there. We work to the specification you’re given, installing the product to its tested details.

For site and facilities teams at buildings such as Parkside Community Primary School, gaps opened by contractors for new cabling are a common finding in schools and offices. If you look after a church, hall or community building such as St Michael and All Angels Church, gaps around pipes and cables are worth checking after any building work there. Letting a property close to Elstree & Borehamwood station? Then any gap left by new services in shared walls should be closed with a fire-rated product.

Green Street is about 1 mile north of Borehamwood, in Hertfordshire. We provide fire rated sealant to homes and businesses in Green Street and the surrounding area, as part of our work across Hertfordshire. Our area takes in 381 places across Hertfordshire, from the larger towns to small villages. For nearby work, see our London page (14 miles or so).

Here we cover the WD6 postcode area for fire rated sealant. Local streets include Stapleton Road, Green Street and Cowley Hill, all of which we cover. Nearby, we also carry out fire rated sealant in 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). Further out, we also 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).

Near you in Green Street

Locally, jobs take us to homes and businesses close to 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 of the centre. Nearby you will also find Hilfield Castle (3 miles south-west) and Shenley Hospital (1.6 miles north-west). Open spaces near Green Street include Darland's Lake and Arkley Lane and Pastures.

Map of Green Street © OpenStreetMap contributors

Questions from Green Street

Is Green Street within the area you cover?

Yes, Green Street is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.

Can you do fire rated sealant in Green Street?

Yes. Our work covers London and the South East, and Green Street is part of that. You can phone 0345 464 0079 or email us and tell us what needs doing, and we’ll send you a clear quote.

Do you take on fire stopping in schools and offices?

Yes. Flats, HMOs, offices, schools and other occupied buildings are all part of our work. We agree access and the order of work with you first.

What should I tell you?

A short description and the location. We’ll ask anything else we need to know.

Does someone need to be in?

If the work is inside, we need someone to let us in. After that, you can carry on with your day.

Can I choose the sealant colour?

Usually, yes. White, clear and grey are common, and other colours are available for many products, and we will agree it with you first.

Will the old sealant be removed?

Yes, every time. New sealant will not bond properly to old, so any old material comes out before anything new goes in.

Can you fill the gap behind a fire door frame?

Yes. We seal the gap between the frame and the wall with a suitable fire-rated product. The door leaf and its hardware need a door specialist.

How it works

When we get to you, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. Most jobs then take from a few hours to a few days, depending on the number of gaps and the access. In a small place like Green Street, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.

  1. First we work through your list or survey, measuring each gap and checking what it’s formed in.
  2. We remove any old or unsuitable filler and clean the gap.
  3. Where the tested detail needs backing or fill, we fit it.
  4. We apply the fire-rated or intumescent sealant to the specified depth and tool it.
  5. We record the locations and products used for your records.

Preparing for the visit

  • Keep children and pets away from the work area
  • Let us know if you’ve seen damp or leaks
  • Clear the area around the work

How to get a quote

To get a quote, call 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You will have a clear quote before we start.

Get a quick quote

Related advice

What we cannot put right

A few problems are outside what sealant work can do:

  • Walls or floors that weren’t built to resist fire
  • Sign-off of the building, which sits with building control or your assessor
  • Openings too large for sealant, which need batts, boards or another system

If you’re not sure, just ring 0345 464 0079 or email us and we will give you a straight answer before booking.

Where we work in Green Street

  • Flats & HMOs
  • Linear gaps
  • Service penetrations
  • Door frames
  • Pipe & cable gaps
  • Plasterboard & masonry

Quotes for fire rated sealant in Green Street

Jobs vary more than people expect. What affects the quote:

  • Whether the work is at height
  • How many rooms, windows or areas are involved
  • The type of sealant required
  • The old material and how stubborn it is

There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please phone 0345 464 0079 or drop us an email.

Asking for a quote

What to tell us when you ask for a quote:

  • Access, such as stairs, a lift or height
  • Whether it has been sealed before
  • Where the property is
  • The problem you’ve noticed

Getting a quote is simple: let us know what needs doing and where. Photos by email help us understand the job, and we’ll come back to you with a quote.

What happens if it’s left?

Fire-rated sealants are less forgiving than ordinary ones. Depth, backing and surface preparation all affect how a seal performs, and we work to the product details every time. In a small place like Green Street, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.

Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. You will know the price before we begin.

Why book with us

  • Any old sealant cut out fully, not covered over
  • Over 20 years’ experience
  • Sanitary silicone with an anti-fungal additive in wet areas
  • Arbo and Everbuild products

Take a look at what affects the cost and our reviews.

20+ yearsMastic and sealant specialists
ARBOMaster approvedApproved applicator for Arbo sealants
Fully insuredDomestic, commercial and hotels
One-year guaranteeOn every job