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

Fire-rated sealing and fire stopping in North Street, Medway

Sealant work in North Street for main contractors, managing agents and facilities managers: fire-rated and intumescent sealing of service penetrations and linear gaps, quoted at a fixed price.

  • Damaged fire seals in risers and voids
  • Non-fire-rated filler around services
  • Unsealed penetrations discovered above suspended ceilings
1
Send details
Photos, drawings or a schedule, or we visit.
2
Get a quote
A fixed quote for the work, with the scope in writing.
3
We seal
The right sealant, to the right depth, neatly finished.
4
Guaranteed
Our workmanship is guaranteed for 12 months.
South East, London & Scotland
CHAS & Constructionline
Fully insured: £5m PL

Fire stopping near North Street

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

How the quote is worked out

Sealant work doesn’t have a standard rate, since sites vary so much. What we take into account:

  • How accessible the joints are
  • Joint width, depth and condition
  • Quantities, in metres or numbers
  • Which sealant the job calls for

A quote for service penetrations depends on quantities, condition and access, and any specification that applies. Ask us for a fixed quote.

What to include in your enquiry

It doesn’t need to be a full survey. These details are enough to start:

  • Clear photos of the problem areas
  • Any specification or named product
  • What the building is and how it’s used
  • The asbestos register, for older buildings

Send details, get a quote, we seal, guaranteed: that’s how every job runs. The first step is to speak to us on 01277 525 020 or email the details over with what you know.

How we handle fire stopping in North Street

Fire-rated sealant suits many small service penetrations: copper and steel pipes, cables and some small ducts where the tested detail allows. Larger openings and some plastic pipes call for collars, wraps, batts or boards instead. We use sealant where it is the specified product, and we tell you when a detail calls for something else. We work on cable penetrations, pipe penetrations and service gaps in risers, and the failures we’re asked to look at most are improvised or mixed-product fire seals and snag lists that include open service penetrations. A specialist sealant contractor works differently from a general builder: in North Street, that means joint design, primers and backing rod as standard.

Rural conversions around North Street can put new fire-resisting partitions inside older structures. A penetration seal only performs as tested if product, substrate, service, gap and depth all match the detail.

What our 12-month guarantee covers is the way we did the job: the preparation, the sealing and the tooling. Damage, later alterations by others and movement beyond what the joint was designed for sit outside it.

Mastic Doctor team members lined up next to their branded vans outside an office building
Where
North Street (ME3)
Wider area
Medway
Guarantee
12 months on our workmanship
Quote
A fixed quote before we start
Telephone
01277 525 020
Updated
3 November 2026

On site: what to expect

At the end of each section, we remove the tape, clean down and inspect every joint. If an area should be left alone while the sealant cures, we say how long and put signs out. Rural sites near North Street may need directions, gate codes or a contact on site. Add it to your enquiry and we’ll build it into the plan.

  1. First we go through the drawings, schedule or specification for the seals and raise any questions before we price.
  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. We apply the specified sealant to the depth and around the services as the detail shows.
  6. If an opening needs something other than sealant, we tell you instead of improvising.

Getting the site ready

  • Flag any permit to work we’ll need
  • Warn occupants and staff about the work
  • Tell us your opening times and when work is allowed

Get a fixed quote

Send us photos, drawings or a joint schedule are often enough for a fixed quote. If the job needs a look first, we’ll arrange a site visit.

Ask for a quote

Advice

Service penetrations in North Street buildings

At about 30 miles from central London, North Street is within reach of the capital. Business park offices in the commuter belt are refitted as tenants change, and each fit-out adds services through compartment walls, and the gaps need sealing with the specified product. Fire stopping of openings and penetrations in England falls under Approved Document B. Its BS 476 references are being withdrawn from 2 September 2029, with BS EN 13501-2 classification taking over, subject to transitional arrangements. Our part stays the same: the specified product, installed to its tested detail.

Campus buildings at universities such as University of Greenwich - Medway, 4 miles south-west of North Street, see constant changes to data and services, and fire-rated sealant goes in around new penetrations where it is specified. In a building such as Church of St Peter and St Paul, any service penetration through a fire-resisting wall should be sealed to the specified detail.

North Street is about 5 miles north of Gillingham, in Medway. We cover commercial sites throughout North Street, whether it’s a single job or part of a planned programme. We work across 54 places in Medway, large and small. For work in that direction, see our London page (30 miles or so).

Anyone looking for fire stopping in ME3 gets the same process as the rest of our area: details, then a fixed price, then sealing and a 12-month guarantee. We also cover Tunbridge Hill (1 mile south-west), Kingsnorth (1 mile south), Stoke (1 mile north-east), Fenn Street (1 mile north-west) and Sharnal Street (1 mile west) for service penetrations. Further afield, our area takes in Gillingham (5 miles south), Chatham (7 miles south-west), Rochester (6 miles south-west), Rainham (5 miles south), Strood (6 miles south-west) and Luton (6 miles south-west).

Landmarks near North Street

Locally, jobs take us to sites close to The White Horse pub. The closest station to North Street is Gillingham (Kent) station, about 4.2 miles south-west. Well-known places in the area include Medway Maritime Hospital (4.9 miles south-west) and Upnor Castle (4 miles south-west). Open spaces near North Street include Bishop Saltings.

Map of North Street © OpenStreetMap contributors

Leave it or put it right?

Fire stopping is a regular point raised at inspections and handover. Finding unsealed or improvised openings late can hold up a programme. Older rural buildings around North Street move with the seasons, and rigid or tired sealant can’t keep up. The right product, sized to the joint, copes much better.

The specified product makes a difference, and so does the preparation, from cutting out to priming and backing rod. Access, phasing and site requirements come into it too.

Why appoint us

  • Fixed quotes based on photographs, drawings or a visit
  • One contact handling all your sites
  • Our applicators hold CSCS cards
  • Workmanship guaranteed for 12 months

Read what affects the cost and our accreditations.

Different surfaces, different methods

Risers and ceiling voids

Service risers and the voids above ceilings are where openings collect. Access to these areas is planned with you in advance, including keys, permits and any isolations.

Masonry and concrete

Core-drilled holes are neat; broken-out ones rarely are. The gap is measured at the widest point so we know it sits within the tested range, and any outside it are raised with you.

General trades versus a specialist

Paperwork matters too. Many sites expect CSCS cards, RAMS and proof of insurance, and we’ll confirm the paperwork you need with the quote.

What you see is the finished bead, but most of the work is hidden. Backing rod, primer where specified and a joint designed to move with the building are easy to get wrong without experience.

What we are called out for in North Street

Some service penetrations were never sealed at all because they sat out of sight above a ceiling or inside a riser. Inspections, refurbishments and ceiling access typically bring them to light.

Typical triggers for a call:

  • Open linear gaps along the top of fire-resisting walls
  • Service penetrations left open after M&E works
  • Builders’ foam or ordinary silicone in compartment walls
  • Hidden openings found during inspections

On a hospital site such as Medway Maritime Hospital (4.9 miles south-west of North Street), fire-rated sealant goes in where the specification calls for it, with the work planned around the estates team’s permits.

Before you book anyone

  • Whether old or failed sealant will be cut out, not overlaid
  • Whether their applicators hold CSCS cards
  • How the joint faces will be prepared and primed
  • Can the work be phased to keep areas open?

Our contractor checklist

Questions we are asked in North Street

Would you work within a site like Medway Maritime Hospital?

Yes. Healthcare sites are among the places we work. Each area is agreed with the ward or department and the estates team in advance.

How does the move away from BS 476 affect penetration seals in North Street?

From 2 September 2029, Approved Document B drops its BS 476 references in favour of BS EN 13501-2 classification, with transitional arrangements. Whichever applies, we install the specified product to its tested detail; the specification is for the designer to set.

Will you quote for a small job?

We quote for single jobs as well as large packages and programmes. Photos and a description are enough to start.

What if there’s asbestos in the old mastic?

Asbestos is possible in some older mastics, particularly in buildings from before 2000. Before we disturb old sealant in an older building, we ask to see the asbestos register or survey, and work stops until any suspect material has been tested. We don’t remove asbestos-containing materials.

How do I request a quote?

It works in four steps: send details, receive a fixed quote, we carry out the work, and it’s guaranteed. Step one needs little more than photos and a postcode.

Can you fit around our working hours?

We’re in the office from 8am until 5pm, Monday to Friday. Let us know your site hours and access windows, and the work will be planned around them.

Can weather delay the job?

For external joints, yes. Sealant needs a dry joint and a temperature within the product’s range, so frost, rain or cold mornings can delay outside work. Inside work is seldom held up.

Accreditations

Trusted. Accredited. Insured.