The Mastic Doctor team standing beside their branded vans outside an office building
Kent · England

Fire-rated sealing and fire stopping in Cranbrook, Kent

Fire-rated and intumescent sealing of service penetrations and linear gaps in Cranbrook. CHAS accredited and fully insured, with a 12-month guarantee.

  • Openings found when ceilings come down for a refit
  • Fire stopping installed outside its tested range
  • Non-fire-rated filler around services
1
Send details
Send the specification, photos or a marked-up plan.
2
Get a quote
A fixed price, with what’s included set out clearly.
3
We seal
The right sealant, to the right depth, neatly finished.
4
Guaranteed
Signed off, with 12 months’ guarantee.
Covering the South East & Scotland
CHAS accredited
£5m public liability

Need fire stopping in Cranbrook?

Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.

Penetration seals near Cranbrook

Central London is about 39 miles from Cranbrook. Offices around the capital are refitted often, and the cabling that follows can breach fire-resisting walls; the gaps need the specified seal. Cranbrook has a number of hotels close by, all within 2 miles. A hotel refit often runs new services through compartment walls between bedrooms and corridors, and each opening needs the specified seal.

Older community buildings such as Congregational Church that have been rewired or given new heating can have service gaps through walls worth checking against the specification. In a school such as Cranbrook School, fire-rated sealant goes in around service penetrations where it is specified.

Cranbrook is about 12 miles south of Maidstone, in Kent. Commercial clients in Cranbrook use us for work on service penetrations, as part of our coverage of Kent. We work across 931 places in Kent, from busy centres to rural villages. Brighton is covered too, around 34 miles from Cranbrook.

Work on service penetrations is covered throughout TN17 and TN18, for business premises of every kind. If your site is on High Street, Crane Lane and White Lion Yard or close by, send details and we’ll quote for service penetrations. If your building is just outside Cranbrook, we cover Baker's Cross (1 mile east), Coursehorn (1 mile east), Swattenden (1 mile south), Hartley (1 mile south-west) and Gill's Green (3 miles south-west). Further afield, our area takes in Maidstone (12 miles north), Ashford (15 miles east), Royal Tunbridge Wells (12 miles west), Tonbridge (13 miles north-west), Kings Hill (13 miles north-west) and Foley Park (13 miles north).

Around Cranbrook

Around Cranbrook, our work takes us to commercial buildings near The Crown Public House, Crane Valley and Cranbrook Church of England Primary School, among other places. A little further out are Sissinghurst Castle (2.5 miles north-east) and Benenden Hospital (3.6 miles east).

Map of Cranbrook © OpenStreetMap contributors

How we handle fire stopping in Cranbrook

Facilities managers in Cranbrook often find open service penetrations when ceilings come down for other work. Where the walls and floors already have a fire-stopping specification, we can work to it. With no specification in place, the first step sits with your designer or fire engineer, not with us. Site teams most often ask us about snag lists that include open service penetrations and openings left by services added after handover, across cable penetrations, small duct penetrations where the tested detail allows and linear gaps at wall heads. Facilities teams, main contractors and managing agents in Cranbrook tend to want the same three things: a clear scope, tidy work and joints that don’t fail again.

Around smaller places like Cranbrook, many commercial buildings are conversions or extensions of older ones, so the wall or floor a service passes through isn’t always what the drawings assume. The right product depends on the wall or floor and the services passing through, and we will tell you if the detail calls for something other than sealant.

We stand by our work: 12 months, guaranteed. It covers how we prepared and applied the sealant, and we come back if anything isn’t right.

Where
Cranbrook (TN17, TN18)
Region
Kent
Cover
12 months on our workmanship
Price
Quoted before any work starts
Telephone
01277 525 020
Updated
3 November 2026
The Mastic Doctor team beside their liveried vans in front of an office building

Your questions answered

Do you work on fire-rated sealing in hotels in Cranbrook?

Yes, where the specification calls for fire-rated sealant. Work is done room by room so the hotel keeps trading; design and sign-off stay with the designer and building control.

Can you work on a hospital site such as Benenden Hospital?

Yes, provided the work is planned with the site’s estates team. We follow the site’s permits, sign-in and infection-control procedures in every area.

Is any job too small?

Single areas, one-off repairs and whole buildings are all quoted the same way: details, then a fixed price, then sealing, then a 12-month guarantee.

What site paperwork can you supply?

Let us know which documents the site needs, such as RAMS, an insurance certificate or CSCS details, and we’ll confirm them with the quote.

Can you handle several sites?

Yes. We take on portfolio and planned maintenance work, with each site phased to suit its occupants.

Can staff carry on working while you are here?

Yes, with some planning. We agree a sequence with your contact so just one area at a time is disrupted.

Do you work in Cranbrook?

Yes. We cover Cranbrook, within our coverage of Greater London, South East England and Scotland. For a quote, call 01277 525 020 or email drawings and photos.

Common problems we fix in Cranbrook

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.

If one of these sounds familiar, it’s time for a closer look:

  • Fire sealant pulled out of the opening
  • Openings found when ceilings come down for a refit
  • Head-of-wall gaps with no fire seal
  • Fire stopping installed outside its tested range

For a hotel such as The George Hotel, less than half a mile to the north of Cranbrook, penetration seals are worth checking after any refit or services upgrade.

What to look for in a quote

  • Proof of insurance
  • How they’ll work around occupants
  • How they handle RAMS and site documents
  • Whether their applicators hold CSCS cards

Choosing a commercial sealant contractor

Maintenance after handover

Once the work is signed off, these steps help:

  • Have penetrations checked while they can still be seen
  • Check with the data sheet before painting over fire sealant
  • File the specified details where the next contractor can find them
  • Put resealing into every M&E and fit-out package

After the work, brief anyone else working in the area that the openings are now sealed. If a seal has to be opened for a new service, it should be reinstated to the same detail, by someone who knows the system.

A simple record of seal locations and products helps. It tells the next contractor exactly what to reinstate, and it helps at inspections.

On site: what to expect

We begin with a short walk round with whoever looks after the building, 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. Several jobs near Cranbrook can be grouped on one trip. Mention the building’s opening times and we will work within them.

  1. First we go through the drawings, schedule or specification for the seals and ask about anything unclear.
  2. Every penetration is compared with its detail: wall or floor type, service, gap size and depth.
  3. Unsuitable fillers and loose debris are taken out of each opening.
  4. We fit the backing the detail asks for, to the stated depth.
  5. Fire-rated or intumescent sealant is gunned in to the specified depth, then tooled.
  6. If an opening needs something other than sealant, we tell you instead of improvising.

Preparing the site

  • Let building users know which areas are affected
  • For older buildings, check the asbestos register before work
  • Tell us your opening times and when work is allowed

Get a fixed quote

Every job follows the same four steps: send details, get a quote, we seal, guaranteed. To take the first step, speak to us on 01277 525 020 or send details through our quote form.

Get a price

Related advice

Doing it in-house

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.

For most general trades, sealant is a sideline. A specialist brings correct preparation, depth control with backing rod and a product suited to that particular joint.

Different surfaces, different methods

Masonry and concrete

Openings through concrete vary from tidy cores to rough break-outs. Each gap is measured where it is widest so we know it sits within the tested range, and any outside it are raised with you.

Metal pipes

Heat travels along metal pipework, and the tested detail may ask for insulation beyond the wall. If the detail needs something beyond sealant, we tell you.

What sets the cost

A fixed quote reflects the actual work. It takes account of:

  • Travel to remote or island sites
  • Phasing around occupants
  • Site requirements such as inductions and permits
  • Joint width, depth and condition

Cost follows what’s involved: stripping out, preparation, sealing, access and phasing. Call for a fixed quote.

Before you send an enquiry

A good diagnosis starts with the right details. Tell us:

  • How the joints are reached, and at what height
  • Asbestos survey details if the building is older
  • Whether the building will be occupied during the work
  • The site address and postcode

Pricing a project or setting a maintenance budget? Send the scope and any drawings, and we’ll return a fixed quote that you can work with. For a chat about it beforehand, speak to us on 01277 525 020 or send photos by email.

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