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

Fire Stopping in Borstal

Commercial sealant work in Borstal for contractors, FMs and building owners: fire-rated and intumescent sealing of service penetrations and linear gaps, quoted at a fixed price.

  • Seals disturbed by maintenance and left open
  • Service penetrations left open after M&E works
  • Fire-stopping items raised at inspection or handover
1
Send details
Photos, drawings or a schedule, or we visit.
2
Get a quote
A fixed price, with what’s included set out clearly.
3
We seal
CSCS-carded applicators, the right product for each joint.
4
Guaranteed
Our workmanship is guaranteed for 12 months.
London, the South East & Scotland
Constructionline member
£5m public liability

Fire stopping for businesses in Borstal

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

Diagnose, treat, sign off

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 each bead is tooled to a neat concave finish. Work in places the size of Borstal is planned as a single visit where we can. Photos with rough sizes let us arrive with everything needed.

  1. First we go through the drawings, schedule or specification for the seals.
  2. On site, each opening is checked against the tested detail it is meant to follow.
  3. Anything that doesn’t belong in the opening, such as expanding foam or general-purpose filler, is removed.
  4. Mineral wool or other backing goes in wherever the detail asks.
  5. Fire-rated or intumescent sealant is gunned in to the specified depth, then tooled.
  6. Openings that need a collar, wrap, batt or other product are flagged to you rather than filled with sealant.

Preparing the site

  • Confirm the product named in the specification
  • Tell staff and tenants when we’ll be in
  • Let us know about inductions and permits

Getting a fixed quote

To get a fixed quote, give us a call on 01277 525 020 or use the quote form. Our quote form is another easy route.

Ask for a quote

Read more

Fire stopping in Borstal

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. If you’re dealing with non-fire-rated filler around services and snag lists that include open service penetrations, we can put it right. Sealant applicators who only do sealant are a different proposition from a general trade with a gun in the van: in Borstal, that means joint design, primers and backing rod as standard.

In places the size of Borstal, fire-resisting walls and floors are found in schools, care homes, health centres and mixed-use buildings. Around those penetrations, fire-rated sealant is installed if specified, with depth, backing and gap all as tested.

We stand by our work: 12 months, guaranteed. It covers how we prepared and applied the sealant.

Location
Borstal (ME1, ME2)
Region
Medway
Guarantee
A 12-month guarantee
Price
A fixed quote before we start
Call
01277 525 020
Last updated
3 November 2026
The Mastic Doctor team standing beside their branded vans outside an office building

Looking after the joints

Keep the joints in good shape with a few simple steps:

  • File the specified details where the next contractor can find them
  • Get seals inspected before ceilings and boxing close
  • Look above ceilings when tiles are lifted for other jobs
  • Foam or ordinary sealant is never a fire-seal repair

Once the seals are in, tell other trades they exist and must not be disturbed. Any seal cut back for a new service needs reinstating to its tested detail.

On fit-outs, get the fire-stopping specification agreed before the services go in. Details can then be picked to suit the actual pipes, cables and ducts, and installation follows the programme.

What sets the cost

What shapes the price:

  • The total length or number of joints
  • Access and working height
  • Site requirements such as inductions and permits
  • The size and state of each joint

Access often affects the price as much as the sealing: easy-to-reach joints are quicker than those that need equipment to get to. Mention the access as part of your enquiry.

Sending details for a quote

For an accurate fixed quote, we need to understand the site. Useful things to include:

  • The site address and postcode
  • Anything awkward about access or site hours
  • What the building is and how it’s used
  • Rough lengths or quantities, or drawings if you have them

A handful of photos and a postcode is the fastest way to a quote. Send them through the quote form, or speak to us on 01277 525 020 or send photos by email if you’d rather talk the job through.

What sealant work can’t fix

Being straight saves everyone time. New sealant won’t cure:

  • Signing off or certifying a building’s fire stopping
  • Fire risk assessments, a job for a competent assessor
  • Walls or floors that aren’t fire-resisting to begin with

If you’re not sure, just speak to us on 01277 525 020 or use the quote form and we’ll give you a straight answer.

Where we work in Borstal

  • Linear gaps at wall heads
  • Small duct penetrations where the tested detail allows
  • Cable penetrations
  • Joints between fire-resisting walls and floors
  • Pipe penetrations
  • Service gaps in risers

Common questions from Borstal clients

Will you take on work at estates like Strood Retail Park, close to Borstal?

Yes, sites like Strood Retail Park are within our area, along with the rest of Borstal. Photos and a short description are enough for a first look.

Do you take on work at healthcare sites like Medway Maritime Hospital?

Yes, healthcare and care buildings are part of our work. Each area is agreed with the ward or department and the estates team in advance.

How much does the work cost?

We don’t publish prices, because every site is different. With photos or drawings, we can give you a fixed quote.

Do you seal on top of existing sealant?

No. We cut the old material out and clean the joint back before sealing, since fresh sealant will not bond reliably to aged material.

Do you work in Borstal?

Yes. Sites across Borstal are covered, and the same phone number covers every area.

How long does a job like this take?

The duration is planned around your programme and the access we’re given. We’ll give you an estimate of time on site when we quote.

Can you tell us what fire stopping our building needs?

No. Deciding what is needed sits with the designer, fire engineer and building control. Our role is fitting the specified fire-rated sealant, following the maker’s tested details.

Commercial clients in Borstal

We work for building owners and managing agents on sealant work across single buildings or whole portfolios. One quote can cover more than one site, which keeps the paperwork simple.

Blocks and communal areas make up much of the work for housing associations and agents. Work can be phased so residents and staff keep access throughout, with each stage agreed with your site contact.

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. While the openings can be reached, sealing them is normally straightforward. Left until ceilings are closed or a tenant moves in, the same work costs more access and more disruption. Sealant hardens, cracks and loses grip with age, UV and movement. Renewing it in good time keeps the building weathertight.

Cost follows what’s involved: removing old material, preparing the joints, the product, the access and how the work is phased. Call for a fixed quote.

Why us?

  • Fully insured
  • Failed material removed, not covered up
  • 12 months’ guarantee on every job
  • Sealing commercial buildings since 2005

Take a look at what affects the cost or our accreditations and insurance.

Fire stopping in Borstal: the local picture

Borstal lies roughly 26 miles out from central London. Business park offices in the commuter belt are refitted as tenants change, and each fit-out adds services through compartment walls. 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. Either way, we install the specified product to its tested detail.

Hotels such as The Dickens Hotel, 1.2 miles to the north-east of Borstal, rely on fire-resisting walls between bedrooms and corridors, and refits that add services leave penetrations to seal where fire-rated sealant is specified. For an estates team at a campus like University for the Creative Arts - Rochester, which lies east of Borstal, summer M&E works are normally followed by a round of penetration sealing. Colleges such as MidKent College Gillingham Campus (to the north-east of Borstal) add IT and services as courses change, and each new penetration through a fire-resisting wall needs sealing with the specified product.

Borstal is about 1 mile south-west of Rochester, in Medway. Our applicators travel to Borstal for work on service penetrations. Borstal is one of 54 places in Medway on our list. For work in that direction, see our London page (26 miles or so).

We take on service penetrations across the ME1 and ME2 postcode area, whatever the building. If your site is on Hill Road, Manor Lane and Mount Road or close by, we can quote for service penetrations. Borstal sits on or close to the M2, useful when we plan access and materials. Nearby places we also cover include Rochester (1 mile north-east), Strood (1 mile north), Cuxton (1 mile west), North Halling (2 miles west) and Wouldham (2 miles south-west). Nearby towns on our patch include Gillingham (4 miles east), Rainham (5 miles east), Park Wood (5 miles east), Lordswood (4 miles south-east), Twydall (4 miles east) and Hoo St Werburgh (5 miles north-east).

Around Borstal

Recent enquiries here include premises near Sir Joseph Williamson's Mathematical School, Former Ordnance Store At Chatham Gun Wharf and St John Fisher RC Comprehensive School. For rail, the closest station is Cuxton station, roughly 1 mile west. Nearby you’ll also find Six Poor Travellers House (1.3 miles north-east) and Rochester Castle (1.3 miles north-east). Not far away are Blue Bell Hill and Ranscombe Farm.

Map of Borstal © OpenStreetMap contributors
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