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

Fire-rated sealing and fire stopping in Crowborough, East Sussex

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

  • Improvised or mixed-product fire seals
  • Unsealed penetrations discovered above suspended ceilings
  • Head-of-wall gaps with no fire seal
1
Send details
Photos, drawings or a schedule, or we visit.
2
Get a quote
Scope agreed and priced before anything starts.
3
We seal
CSCS-carded applicators, the right product for each joint.
4
Guaranteed
Signed off, with 12 months’ guarantee.
South East, London & Scotland
Constructionline member
£5m PL insurance

Fire stopping in Crowborough

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

Fire stopping in Crowborough

Where pipes, cables and other services cross a compartment wall or floor, the opening around them has to be closed so fire and smoke can’t move between compartments. Our job is fitting fire-rated and intumescent sealant at those service penetrations, and along linear gaps, where it is the specified product. Each seal follows the manufacturer’s tested detail rather than guesswork. If you have openings found when ceilings come down for a refit and unsealed joints where partitions meet the slab, we can help, whatever the surface. Whoever orders the work in Crowborough, the brief is usually the same: a clear scope, tidy work and joints that don’t fail again.

Towns the size of Crowborough have plenty of buildings with compartment walls: schools, care homes, surgeries, offices and blocks of flats. New cabling or pipework through a fire-resisting wall leaves a gap that has to be made good with the specified product.

Our 12-month guarantee is about workmanship, not wear and tear. Sealant wears with time, and movement, weather, cleaning and use decide how fast, so we are clear about what is covered before work starts.

Mastic Doctor team members lined up next to their branded vans outside an office building
Place
Crowborough (TN6)
Region
East Sussex
Cover
12 months on our workmanship
Quote
A fixed quote before we start
Phone
01277 525 020
Updated
3 November 2026

How a job runs

We follow your site rules from the start: sign-in, induction and whatever permit system the building uses. Once we’re cleared to begin, the joints are worked through in the order agreed with your site contact. Most work in Crowborough is one building at a time: a school, a unit, an office or a block. We start with your photos, drawings or a site visit, then send a fixed quote.

  1. First we go through the drawings, schedule or specification for the seals and ask about anything unclear.
  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. 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.

Preparing the site

  • Arrange parking or a loading space
  • Send any specification or drawings in advance
  • Warn occupants and staff about the work

Getting a fixed quote

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. If you have questions first, phone 01277 525 020 or email us.

Get a price

Related advice

Why it’s worth doing now in Crowborough

It is cheaper to seal service penetrations as each services package finishes than to come back for them later. Openings are visible, access is open and nothing has to be taken down. In a town such as Crowborough, a lot of buildings are older and have been altered over time, and joints where old meets new tend to fail first. Resealing them early protects the building behind.

We don’t publish prices, because the scope varies so much from one building to the next. Call for a quote and we’ll price your job on its own details.

What you get with us

  • CHAS accredited
  • 12 months’ guarantee on every job
  • One number for every site we cover
  • A fixed quote before work starts

See what affects the cost or our accreditations.

What the job involves on each surface

Drylining partitions

Service holes through plasterboard are frequently oversized or ragged. An oversized hole may be outside the sealant’s range, and the detail may call for board patching or another product.

Risers and ceiling voids

Openings above suspended ceilings are easy to miss. We follow your schedule area by area.

When it isn’t the sealant

We seal joints; we don’t mend everything behind them. On its own, sealant can’t deal with:

  • Issuing fire ratings or certificates for seals
  • Designing or specifying fire stopping, which sits with the designer or fire engineer
  • Openings that need collars, wraps, batts or boards rather than sealant

If you’re not sure, just phone 01277 525 020 or email a schedule or drawings and we’ll give you a straight answer before you book.

What we seal

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

Questions we are asked in Crowborough

Is Crowborough Business Park, near Crowborough, within your area?

Yes, sites like Crowborough Business Park are within our area, along with the rest of Crowborough. To start, just speak to us on 01277 525 020 or email the details over with the unit, the joints involved and your access times.

What does the BS 476 change mean for fire-rated sealant in Crowborough?

References to BS 476 classes are being removed from Approved Document B from 2 September 2029, after which BS EN 13501-2 classification is the route, subject to transitional arrangements. Whichever applies, we install the specified product to its tested detail; the specification is for the designer to set.

When is resealing likely to be due?

Nobody can honestly give a figure in years, because life depends on how much the joint moves, how exposed it is and how it’s cleaned and used. Regular checks let you plan resealing before leaks or damage.

What if there’s asbestos in the old mastic?

Managing asbestos is the dutyholder’s responsibility, so for older buildings we ask for the asbestos register first. Work pauses if suspect material is found, until it has been tested.

Can the sealant be colour-matched?

That depends on the product. Some ranges are wide, others limited, so the available colours are confirmed with the quote.

Is any job too small?

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

Can you work while the building is occupied?

In the majority of cases, yes. Phased work can be planned so areas stay in use.

What affects the price in Crowborough

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

  • Joint width, depth and condition
  • Access and working height
  • Specialist products, such as fire-rated or hygienic sealants
  • Removal of failed or old sealant

The specified product makes a difference, as does the preparation each joint needs. Access, phasing and site requirements come into it too.

Sending details for a quote

We can often quote from photographs and a few details. Please tell us:

  • Whether an asbestos survey exists
  • The product your specification calls for
  • Whether the building will be occupied during the work
  • Photos of the joints, close up and from further back

Send us photos, drawings or a joint schedule and a fixed quote comes back to you. Where a site visit makes more sense, we’ll arrange one.

Compartment walls and floors in Crowborough

In England, Approved Document B covers fire stopping of openings and penetrations. The national BS 476 classes are due to drop out of it from 2 September 2029, leaving the European BS EN 13501-2 route, subject to transitional arrangements. Our part stays the same: the specified product, installed to its tested detail. Central London is about 33 miles from Crowborough. Business park offices in the commuter belt are refitted as tenants change, and each fit-out adds services through compartment walls.

For a building at a site such as Crowborough Business Park (0.6 miles north of Crowborough), a check of penetration seals after each fit-out is good practice. Halls and meeting rooms at places like The Parish Church of All Saints sometimes gain new services, and any compartment wall crossed needs the specified seal. Hospital estates such as Crowborough War Memorial Hospital, 0.5 miles west of Crowborough, are divided into fire compartments, and any service penetration through them should be sealed to the specified, tested detail.

Crowborough is about 16 miles south of Sevenoaks, in East Sussex. Our applicators travel to Crowborough for work on service penetrations. 308 places across East Sussex fall within our area, including Crowborough. Sites around Brighton have their own page, about 20 miles away.

Commercial sites across TN6 are covered for service penetrations. Streets here include Church Road, High Street and London Road. With the A26 and B2100 nearby, Crowborough is easy to get to with materials and equipment. Close to Crowborough, our area also takes in Jarvis Brook (1 mile east), Steel Cross (1 mile north-east), Boarshead (2 miles north-east), Sweethaws (2 miles south-west) and Marden's Hill (2 miles north-west). Nearby towns on our patch include Lewes (14 miles south-west), Hailsham (14 miles south), Uckfield (6 miles south-west), South Malling (14 miles south-west), Heathfield (7 miles south-east) and Southover (14 miles south-west). Crowborough ranks among the main centres of East Sussex, with offices, shops, schools and other public and commercial buildings.

Landmarks near Crowborough

In Crowborough, that means premises near Beacon Academy and The Crowborough Cross pub. Crowborough’s nearest station is Crowborough station, roughly 1 mile south-east of the centre. Well-known places in the area include Crowborough War Memorial Hospital (0.5 miles west). For a walk, there’s Crowborough Country Park.

Map of Crowborough © OpenStreetMap contributors

Looking after the joints

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

  • Settle who seals which penetrations at the start of a project
  • Get seals inspected before ceilings and boxing close
  • Check risers and ceiling voids after each round of works
  • Don’t let anyone top up a fire seal with the wrong product

Don’t patch a fire-rated seal with anything outside its tested detail. Repairs need the same product and detail as the original unless the designer specifies otherwise.

Make reporting new openings part of every permit to work in service areas. It costs little and catches breaches early.

Accreditations

Trusted. Accredited. Insured.