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

Fire-rated sealing and fire stopping in Crawley, West Sussex

Work needed on a service penetration in Crawley? We assess it, carry out the work and guarantee our workmanship for 12 months.

  • Fire seals cut back for extra cables and never reinstated
  • Fire sealant pulled out of the opening
  • Snag lists that include open service penetrations
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
Prepared joints, the specified product, a tidy finish.
4
Guaranteed
Signed off, with 12 months’ guarantee.
London, the South East & Scotland
CHAS & Constructionline
£5m public liability

Fire stopping in Crawley

Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.

Commercial clients in Crawley

As a CHAS accredited contractor and Constructionline member, we make supplier vetting simple. We’re fully insured, and our insurance certificate can go with the quote.

Building owners and managing agents use us on sealant work across single buildings or whole portfolios around Crawley. One quote can cover more than one site, which keeps the paperwork simple.

Fire stopping in Crawley, done properly

We should be clear about what we do and don’t do. The designer, fire engineer or building control decides which fire stopping is required. What we bring is careful installation of the specified sealant, to the maker’s guidance on buildings around Crawley. The enquiries we see most involve fire seals cut back for extra cables and never reinstated and old intumescent sealant that has split away, across cable penetrations, linear gaps at wall heads and pipe penetrations. For commercial sealant work in Crawley, you deal with one contact from quote to sign-off, for single jobs and planned programmes alike.

On larger sites around Crawley, fire-rated sealing usually follows the M&E trades floor by floor. We work to the specification and the manufacturer’s installation guidance, while design and sign-off stay with the designer and building control.

Every job ends the same way: guaranteed. You get a 12-month guarantee on our workmanship, and we explain exactly what that covers when we quote.

Mastic Doctor team members lined up next to their branded vans outside an office building
Location
Crawley (RH10, RH11, RH12, RH6)
Wider area
West Sussex
Guarantee
A 12-month guarantee
Price
A fixed quote before we start
Telephone
01277 525 020
Last updated
3 November 2026

How a job runs

Working in a building that stays open takes some planning. The work area is signed and kept contained, keep walkways clear and move on in phases so staff and visitors can carry on around us. Jobs in a large place like Crawley are often on business parks, retail sites or campuses with their own sign-in and permit rules. Send the site rules with your enquiry and we will plan to them.

  1. We ask for the product and detail your designer has specified.
  2. We sort the openings by the detail each one needs.
  3. Improvised fillers and failed sealant are removed.
  4. Where the detail needs backing, it goes in at the stated depth.
  5. Fire-rated or intumescent sealant goes in around the services and is tooled off.
  6. Completed areas are checked with you, with the records agreed when we quoted.

Preparing the site

  • Share your working hours and any access restrictions
  • Send any specification or drawings in advance
  • For older buildings, check the asbestos register before work

Ask for a quote

The quickest route to a quote is a few photographs and the site postcode. Upload them with the quote form, or speak to us on 01277 525 020 or email the details over to discuss it first.

Get a price

Related advice

When something else is needed

Being straight saves everyone time. Fresh joints won’t solve:

  • Gaps in walls that were never built as compartment walls
  • Designing or specifying fire stopping, which sits with the designer or fire engineer
  • Approving the work on behalf of building control

Not sure which it is? You can give us a call on 01277 525 020 or use the quote form and we will tell you honestly before you book.

What we seal

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

Different surfaces, different methods

Risers and ceiling voids

Voids hide a lot of unsealed openings. We follow your schedule area by area and tell you about openings outside the list.

Plastic pipes

Plastic waste pipes through slabs come up often. Whether sealant alone is acceptable depends entirely on the tested detail.

After the work

Once the work is signed off, a little attention goes a long way:

  • Treat an open penetration as a priority repair
  • Brief every trade that openings they make must be sealed
  • Don’t let anyone top up a fire seal with the wrong product
  • Have penetrations checked while they can still be seen

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 using the same product.

Regular walk-rounds of service areas are worth the time. Catching a damaged seal early keeps the fix small compared with dozens found at once.

Why deal with it now?

Fire stopping is a regular point raised at inspections and handover. Finding unsealed or improvised openings late can hold up a programme which is why earlier is better. On a busy site in a large place like Crawley, a failed joint gets worse with every day of use, until a reseal turns into a repair. Acting early keeps it a sealant job.

Every site prices differently: joint size, product, access and site hours all play a part. Send the details and a fixed figure follows.

Why appoint us

  • Sealing commercial buildings since 2005
  • One contact handling all your sites
  • Old sealant cut out, never sealed over
  • Clear, fixed quotes

Read how commercial sealant jobs are priced or our accreditations and insurance.

Fire stopping in Crawley: the local picture

Crawley has three care or nursing homes no more than 2 miles away. Care homes rely on fire-resisting walls and floors, and maintenance work that breaks through them leaves openings to seal. We install fire-rated sealant to the tested detail where it is specified. Approved Document B is the English guidance that covers fire stopping around openings and penetrations. References to the older BS 476 classes are being removed from it from 2 September 2029, after which the European classification, BS EN 13501-2, is the route, subject to transitional arrangements. We install whatever has been specified, to the product’s tested detail.

For a site team at a college like Crawley College (0.5 miles north-east of Crawley), fire-rated sealing is best scheduled after the summer works. Theatres, wards and plant rooms at sites like Crawley Hospital (0.5 miles north-west of Crawley) all have compartment walls crossed by services. For a unit at a site such as Denvale Trade Park, less than half a mile north-east of Crawley, new power or data runs between office and warehouse can breach a compartment wall.

Crawley is about 27 miles south of London, in West Sussex. Looking for fire stopping in Crawley? We can help. Crawley is one of 373 places in West Sussex on our list. Sites around Brighton have their own page, roughly 19 miles from Crawley.

Postcode districts covered here: RH10, RH11, RH12 and RH6 for service penetrations. We cover commercial and managed buildings on Station Road, Queens Square and High Street and the roads nearby. Access to Crawley is via the A23 and A264 among other routes, so getting applicators and materials to site is simple. Nearby places we also cover include Southgate (1 mile south-west), Tilgate (1 mile south-east), West Green (1 mile north), Three Bridges (1 mile east) and Langley Green (1 mile north) for service penetrations. Nearby towns on our patch include Horsham (7 miles south-west), Haywards Heath (9 miles south-east), Burgess Hill (11 miles south), East Grinstead (8 miles east), Billingshurst (13 miles south-west) and Roffey (5 miles south-west). Crawley is one of the busier places in West Sussex, and we take on service penetrations for its commercial and public buildings.

Landmarks near Crawley

We work on buildings around Tilgate Park, St Wilfrid's Catholic School and St Francis of Assisi Catholic Primary School and the streets around them. Crawley has its own railway station: Crawley station. Well-known places in the area include Crawley Hospital (0.5 miles north-west) and County Mall (under half a mile north-east). Green spaces nearby include Tilgate Lake.

Map of Crawley © OpenStreetMap contributors

Questions we’re asked in Crawley

Do you cover business parks and estates near Crawley, such as Denvale Trade Park?

Yes. We cover Crawley and the area around it, including industrial estates, business parks and retail parks such as Denvale Trade Park. A few photographs and the unit address let us price the work.

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

Yes, where fire-rated sealant is the specified product. It goes in to the manufacturer’s tested detail for the wall or floor and the services passing through, and we’ll tell you if the detail calls for a collar, wrap or batt instead.

Can you fit around our working hours?

Give us your site hours and any access windows in your enquiry, and we will schedule the work to suit. You can reach the office between 8am and 5pm, Monday to Friday.

Are you CHAS accredited and on Constructionline?

Yes. CHAS accredited, Constructionline member, and our applicators hold CSCS cards.

Is your workmanship covered by a guarantee?

Yes, for 12 months. If a joint fails because of how we installed it, we come back and put it right.

Will you just go over the old sealant?

No. Failed sealant is removed and the faces cleaned back to sound, dry material first, because fresh silicone will not bond with aged silicone.

How do you deal with asbestos in old sealant?

Managing asbestos is the dutyholder’s responsibility, so we will ask for the register before work on an older building. Work pauses if suspect material is found, until it has been tested.

Accreditations

Trusted. Accredited. Insured.