Fire-rated sealing and fire stopping in Cranham, Greater London
Fire stopping for Cranham, from a contractor working since 2005. Fully insured and CHAS accredited.
- Improvised or mixed-product fire seals
- Fire-rated sealant that has cracked or shrunk back
- Penetration schedules that need working through
Fire stopping near Cranham
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
Quoting for work in Cranham
Sealant work doesn’t have a standard rate, since sites vary so much. What we look at:
- How accessible the joints are
- Joint width, depth and condition
- Which sealant the job calls for
- Whether old sealant has to be cut out first
Access can matter as much as the joints themselves: joints within easy reach take less time than ones that need access equipment. Tell us how the joints are reached and call for a quote.
What we need to price the job
Good information means a firmer quote. Helpful details to send:
- Any dates the work must fit around
- The type of building and who uses it
- Rough lengths or quantities, or drawings if you have them
- The postcode of the building
Send details, get a quote, we seal, guaranteed: that’s how every job runs. The first step is to call the office on 01277 525 020 or send details through our quote form with what you know.
About our fire stopping in Cranham
The test standards are BS EN 1366-3 for penetration seals and BS EN 1366-4 for linear joints, with results classified under BS EN 13501-2. That classification, such as EI 60 or EI 120, belongs to the product in its tested arrangement. So our job is to reproduce that arrangement faithfully. Most enquiries involve seals that don’t match their tested detail and fire-stopping items raised at inspection or handover, across joints between fire-resisting walls and floors, pipe penetrations and small duct penetrations where the tested detail allows. One point of contact handles commercial sealant work in Cranham from the first photographs to the final walk-round, whether it’s one building or several.
London has many occupied offices, blocks and mixed-use buildings where services are added and rerouted all the time. Each service penetration gets fire-rated or intumescent sealant if that’s what is specified, laid to the product’s tested arrangement.
A 12-month guarantee applies to all our work. Should something we installed fail, call 01277 525 020 or email drawings and photos and we’ll come back to it.
- Place
- Cranham (RM14)
- Region
- Greater London
- Guarantee
- 12 months on our workmanship
- Quotes
- Fixed quote, scope in writing
- Telephone
- 01277 525 020
- Page updated
- 3 November 2026
What happens if it’s left?
An open or wrongly sealed service penetration lets fire and smoke reach the next compartment much sooner than the building was designed for. Putting it right is usually a modest job when the openings are accessible. Wait until ceilings close or areas are occupied and the same work becomes harder to reach. In Cranham, each extra visit means more notices, permits and disruption, so cutting the old sealant out fully and doing it right once is the better route.
The product called for affects the cost, and so does the preparation, such as cutting out, priming or new backing rod. Access, phasing and site rules also count.
What you get with us
- Joints cleaned back to sound surfaces
- 12 months’ guarantee on every job
- A fixed quote before work starts
- Work carried out by CSCS-carded applicators
Take a look at our cost guide and how we’re accredited.
When to bring in a specialist
Redoing a failed joint normally costs more than getting it right at the outset, because the whole bead must be removed and the faces cleaned back again. For that reason, many FMs and contractors use a sealant specialist from the outset.
What you see is the finished bead, but most of the work is hidden. Correct depth, the right primer and a sealant matched to the movement are easy to get wrong without experience.
Common questions from Cranham clients
Is a hospital such as Hartswood Hospital somewhere you can work?
Yes, healthcare and care buildings are part of our work. Work is phased so departments keep running, under the site’s own rules.
How does the removal of BS 476 from Approved Document B affect fire-rated sealing in Cranham?
From 2 September 2029, Approved Document B drops its BS 476 references in favour of BS EN 13501-2 classification, with transitional arrangements. Our part doesn’t change: the specified product, to its tested detail.
How long before the joints can be used?
That comes down to the sealant and the temperature. Some take light use quickly, others need longer to cure, so we’ll confirm the curing time on the day.
How long does a typical visit take?
That varies with the scale of the job, though a typical visit usually takes anything from one day to a planned run of visits, depending on the number of seals and the access. Larger or phased jobs take longer, and we will give you a timescale with the quote.
Do you hold CHAS accreditation?
Yes. We’re CHAS accredited and a Constructionline member, which helps with supplier vetting.
Are you insured?
Yes. Mastic Doctor is fully insured, public liability included.
Can weather delay the job?
It can, when the joints are outside. Sealant won’t bond properly to a wet or frosty joint, so we watch the forecast and rearrange outside work if we have to. Indoors, the weather is rarely a problem.
When to call us in Cranham
Fire stopping can get squeezed at the end of a programme, or done by whoever is on site. That is when untested combinations creep in.
Site and facilities staff are often the first to spot these:
- Fire-rated sealant that has cracked or shrunk back
- Unsealed joints where partitions meet the slab
- Damaged fire seals in risers and voids
- Unsealed penetrations discovered above suspended ceilings
Wherever services are added at a hospital such as Hartswood Hospital, 2.9 miles north of Cranham, the compartment line has to be made good with the specified product.
What your quote should include
- How the joint faces will be prepared and primed
- Which product they’ll use, and why it suits the joint
- How they handle RAMS and site documents
- Their plan for phasing and protecting the area
Our process
We bring the products specified for the job, along with primers and backing rod. Joint faces are cleaned back to sound, dry surfaces, the manufacturer’s primer is applied where it’s called for, and the sealant is tooled off neatly. All of Greater London is in the ULEZ, and kerbside space in Cranham can be scarce. If there’s a loading bay, a car park or a permit we can use, tell us when you send details.
- First we confirm the product and tested details named in the specification.
- We sort the openings by the detail each one needs.
- Old or wrong materials are cut out.
- Mineral wool or other backing is fitted where required.
- Fire-rated or intumescent sealant goes in around the services and is tooled off.
- We walk the completed areas with you and confirm the records agreed at quote stage.
Before we start on site
- Point out any areas we must not close
- Explain the parking and delivery arrangements
- Clear stock, furniture or equipment away from the joints
Get a fixed quote
To get a fixed quote, ring 01277 525 020 or use the quote form. You can also send details through our quote form.
Related advice
Owners, agents and contractors
Main contractors use us as their sealant subcontractor, on new build and refurbishment alike. We work to your programme, your specification and your site rules, and our applicators hold CSCS cards.
Facilities managers want contractors who arrive with the paperwork sorted. Let us know the documents you need (RAMS, insurance certificate, CSCS details) and we’ll confirm them with the quote.
Compartments and services around Cranham
Every new tenant in a London building tends to bring new cabling, and with it new holes through compartment walls. We install fire-rated sealant where it is specified and work within the building manager’s permit system. Fire stopping of openings and penetrations in England falls under Approved Document B. From 2 September 2029, BS 476 references are being taken out of Approved Document B, leaving BS EN 13501-2 classification as the route, subject to the Government’s transitional arrangements. Our part stays the same: the specified product, installed to its tested detail.
For a school such as Hall Mead School, penetration sealing fits best at the end of the summer works. For a site team at a college like New City College, which lies west of Cranham, fire-rated sealing is best scheduled after the summer works.
Cranham is about 2 miles east of Hornchurch, in Greater London. Any commercial site in Cranham is covered. Cranham is one of 764 places in Greater London on our list. Our London page has more on work in that area, about 16 miles away.
Business premises anywhere in RM14 are within our area for service penetrations. For a building on Avon Road, Moor Lane and Front Lane or nearby, we can quote for service penetrations. If your building is just outside Cranham, we cover Upminster (1 mile west), Puddle Dock (1 mile east), Upminster Bridge (1 mile west), North Ockendon (2 miles south-east) and Emerson Park (2 miles north-west). A short drive away, we cover Shoreditch (15 miles west), Walthamstow (13 miles west), Hoxton (15 miles west), Whitechapel (15 miles west), Orpington (14 miles south-west) and Plaistow (11 miles west).
Landmarks near Cranham
Around Cranham, our work takes us to commercial buildings near The James Oglethorpe Primary School, The Crumpled Horn pub and St. Andrew's Park and the streets around them. The closest station to Cranham is Upminster station, roughly 0.7 miles west of the centre. Nearby you will also find The Mercury Mall (3.7 miles west) and Upminster Tithe Barn Museum of Nostalgia (0.6 miles north-west). The countryside around Cranham includes Cranham Brickfields.