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

Fire-rated sealing and fire stopping in South Street, East Sussex

Fire-rated and intumescent sealing of service penetrations and linear gaps across South Street, carried out by CSCS-carded applicators. CHAS accredited and fully insured.

  • Unsealed openings around new pipes and cables
  • Seals that don’t match their tested detail
  • Old intumescent sealant that has split away
1
Send details
Drawings, photos, a joint schedule or a site visit.
2
Get a quote
One fixed quote covering the agreed scope.
3
We seal
The right sealant, to the right depth, neatly finished.
4
Guaranteed
Our workmanship is guaranteed for 12 months.
Covering the South East & Scotland
CHAS & Constructionline
Fully insured: £5m PL

Fire stopping for businesses in South Street

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

Leave it or put it right?

Inspections and handover checks often pick up fire stopping. Late discoveries can delay handover while openings are reopened and resealed. Halls, stores and units around places like South Street may not be checked every day, so a failed joint can leak for a while before anyone sees it. Resealing early avoids that.

What a job costs comes down to the quantity of joints, what has to come out first and how the joints are reached. Call for a fixed quote once you have the details.

Why clients in South Street choose us

  • One phone line for London, the South East and Scotland
  • Fully insured
  • Health and safety: CHAS accredited
  • A fixed quote before work starts

Take a look at how commercial sealant jobs are priced or our accreditations and insurance.

About our fire stopping in South Street

It helps to set out our role at the start. The designer, fire engineer or building control decides which fire stopping is required; sign-off sits with them too. We fit the specified fire-rated sealant following that specification and the maker’s installation guidance on buildings around South Street. Site teams most often ask us about openings left by services added after handover and unsealed joints where partitions meet the slab, across service gaps in risers, cable penetrations and joints between fire-resisting walls and floors. Whether you call it commercial sealant work, mastic application or joint sealing, the work in South Street is the same: the right product in a properly prepared joint.

Around smaller places like South Street, penetration seals come up in schools, halls, pubs with rooms, care homes and farm buildings used as offices. If sealant is what the specification names, we install it around the services exactly as the maker’s detail sets out.

Every job ends the same way: guaranteed. Our workmanship is backed for 12 months, and the quote explains what it covers.

Location
South Street (BN8)
Region
East Sussex
Cover
12 months on every job
Price
Quoted before any work starts
Telephone
01277 525 020
Page updated
3 November 2026
The Mastic Doctor team standing beside their branded vans outside an office building

Diagnose, treat, sign off

Tell us your site hours and access windows and we’ll plan around them. On the day, the work area is kept contained and tidy, and your contact hears from us before we move to the next area. If others near South Street need work, visits can be combined, which keeps travel down. A fixed quote is given before anything starts.

  1. The specification and schedule come first, so we know which details apply.
  2. We plan the sequence of floors, risers and voids with you.
  3. Each opening is checked for wall or floor type, service, gap and depth.
  4. Unsuitable material is removed and the opening cleaned.
  5. The specified backing and sealant go in to depth and are finished neatly.
  6. We tell you about openings that need a different product.

Preparing the site

  • Tell staff and tenants when we’ll be in
  • Tell us what induction or permit system the site runs
  • Tell us your opening times and when work is allowed

Quotes

Send details, get a quote, we seal, guaranteed: that’s how every job runs. To take the first step, ring 01277 525 020 or email the details over.

Get a quick quote

Advice

Looking after the joints

For the best life from the joints:

  • Get seals inspected before ceilings and boxing close
  • Settle who seals which penetrations at the start of a project
  • Look above ceilings when tiles are lifted for other jobs
  • Record which product was used where

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.

The simplest way to keep compartment walls intact is to plan fire stopping into every job that crosses them. Then the seal goes in while the area is open.

General trades versus a specialist

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, which is what makes a joint last.

Certain joints really need a specialist: fire-rated seals that must follow a tested detail, trafficked floor joints and external movement joints among them. Getting these wrong typically costs more in the end than doing them right.

Surface by surface

Risers and ceiling voids

Risers and ceiling voids hold most of a building’s service penetrations. Access is often tight, so we agree it with you in advance.

Cables and cable bundles

New data and power cables are the most common breach we see. We reseal around them to the specified detail, and any bundle too large for sealant alone is flagged.

Quoting for work in South Street

The price varies from site to site. It mainly depends on:

  • The size and state of each joint
  • The product specified
  • Any access equipment needed
  • How much there is to seal

Larger quantities, tricky access or phasing all shape the price. Site requirements like inductions and permits play a part as well.

Sending details for a quote

Whether it’s one area or a whole building, these details speed things up:

  • Whether the building will be occupied during the work
  • Specification clauses that apply
  • Any dates the work must fit around
  • Access details, including height

Quotes are fixed against the scope you send, so the cost is agreed before work starts. To ask for one, speak to us on 01277 525 020 or email us.

Fire stopping in South Street: the local picture

South Street is about 38 miles from central London. Business park offices in the commuter belt are refitted as tenants change, and each fit-out adds services through compartment walls; the gaps need the specified seal. Approved Document B is the English guidance that covers fire stopping around openings and penetrations. From 2 September 2029, BS 476 references are being taken out of Approved Document B, leaving BS EN 13501-2 classification as the route, subject to the Government’s transitional arrangements. Our part stays the same: the specified product, installed to its tested detail.

Holiday works at schools like Chailey School often leave service openings to seal before pupils return. Hospital estates such as Princess Royal Hospital, 4.3 miles north-west of South Street, are divided into fire compartments, and any service penetration through them should be sealed to the specified, tested detail. Residences at universities like University of Sussex, 1.1 miles to the north-west of South Street, have compartment walls that must be resealed whenever services change.

South Street is about 5 miles east of Burgess Hill, in East Sussex. Businesses, contractors and managing agents in South Street can call on us for service penetrations, as part of our coverage of East Sussex. Our East Sussex coverage takes in 308 places, from busy centres to rural villages. Sites around Brighton have their own page, about 9 miles away.

We cover the BN8 postcode districts for service penetrations. If your site is on Green Lane, Markstakes Corner and St James Walk or close by, we can quote for service penetrations. Just outside South Street, we also work in South Chailey (1 mile south), Chailey (1 mile north-east), North Chailey (2 miles north), Chiltington (2 miles south) and Plumpton Green (2 miles south-west). A short drive away, we cover Seaford (13 miles south-east), Lewes (5 miles south), Hailsham (13 miles south-east), Crowborough (11 miles north-east), Uckfield (5 miles east) and Newhaven (11 miles south).

Around South Street

In South Street, that means premises near The Five Bells Inn and Chailey St Peter's Church of England Primary School and the streets around them. For rail, the closest station is Plumpton station, roughly 2.2 miles south-west. A little further out are Princess Royal Hospital (4.3 miles north-west). For a walk, there’s Blackcap and Malling Down.

Map of South Street © OpenStreetMap contributors

Questions we are asked in South Street

Will you plan work around the academic year at somewhere like University of Sussex?

Yes. Education sites normally want the work in vacations or in phases during term, and we plan to suit. Tell us which site documents you need, such as RAMS, our insurance certificate or CSCS details, and they’re confirmed with the quote.

Can you take on a job at a hospital such as Princess Royal Hospital?

Yes, healthcare and care buildings are part of our work. The estates team’s permit system and infection-control rules come first, and the work is planned around them.

Can you work to our specification?

Yes. Send it with your enquiry, and we’ll price the work to it.

How long does a typical visit take?

We plan the time on site around your programme and access. You’ll have an expected duration with the quote.

What does an EI 60 rating mean?

BS EN 1366-3 covers penetration seals and BS EN 1366-4 covers linear joints. Classification follows BS EN 13501-2 as E for integrity and I for insulation, with a time such as EI 60 or EI 120. The rating applies to the product as tested.

Can the sealant be colour-matched?

It depends on the product specified. Some ranges offer many colours, others very few, so we will confirm the colours available for the specified product with the quote.

When is resealing likely to be due?

Nobody can honestly give a figure in years, since movement, weather, cleaning and use all affect it. Regular checks let you plan resealing before leaks or damage.

Accreditations

Trusted. Accredited. Insured.