Greater London · England

Fire-rated sealant in Nunhead, Greater London

Intumescent and fire-rated sealant around gaps, frames and service penetrations for Nunhead, backed by a one-year guarantee. Call for a quick quote.

  • Door frames with gaps between frame and wall
  • Gaps filled with a product that isn’t fire-rated
  • New service routes left unsealed after building work

Fire rated sealant in Nunhead

Aftercare tips

So the new joints stay in good condition:

  • Plan fire stopping into any work that goes through walls or floors
  • Do not paint over fire sealant until it has cured
  • Include hidden areas like risers in routine checks
  • Make resealing part of every contractor’s brief

Look at the sealed gaps as part of your routine walk-rounds. Look for cracks, gaps or sealant that has been cut or pulled out and have them put right.

Small gaps around services are simple to deal with while there are only a few. Over time, more work adds more holes and the list grows.

Fire rated sealant in Nunhead

Landlords, managing agents and facilities teams use us for the sealant items on a fire risk assessment on buildings across Nunhead. If you share the list, we can quote for the gaps that need fire-rated sealant. Common call-outs are for new service routes left unsealed after building work and door frames with gaps between frame and wall, across linear gaps, service penetrations and door frames.

London’s offices, shops, hotels, student accommodation and blocks of flats all have joints to look after, whether that is washroom resealing or fire-rated sealant around service openings. Where a building in Nunhead needs to stay open, work can be planned outside normal hours.

Whatever the size of the job, it’s backed by our one-year guarantee in Nunhead and across Greater London.

Eleven members of the Mr Mastic team standing in front of branded white vans
Place
Nunhead (SE15, SE4, SE14)
Region
Greater London
Guarantee
A year, on every job
Quote
A clear price before any work starts
Telephone
0345 464 0079
Last updated
26 October 2026

Leave it or put it right?

If an assessor has flagged gaps, it makes sense to close them before the next review. Having them sealed and recorded now gives you evidence that the item was dealt with. In London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Dealing with it early is far simpler.

A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you’re not sure whether it needs doing, call 0345 464 0079 or send us an email and we will give you an honest view and a quote.

Why us?

  • ARBOMaster approved applicator
  • Fully insured
  • More than 20 years in sealant work
  • Domestic, commercial and hotel work

Read how sealant jobs are priced or our reviews.

What happens on the day

We work through the job in order: protect, prepare, seal, tidy. For most jobs that takes anything from a few hours to several days, depending on how many gaps there are. In a London area like Nunhead, the main things to plan are parking and access: let us know about parking, the floor we’ll be working on and any lift or shared entrance.

  1. We start with the survey or action list, checking the size and surfaces of every gap.
  2. Old or unsuitable sealant is cut out and the gap cleaned.
  3. Backing or fill is fitted where the product’s tested detail calls for it.
  4. Fire-rated or intumescent sealant is applied to the right depth and tooled.
  5. Finally, we list where we worked and what we used, for your records.

Getting ready for the visit

  • Where the joints are inside, avoid wetting them before we arrive
  • Tell us about access, such as stairs, a lift or high-level joints
  • On commercial sites, let us know about site rules

Get a quote

Call for a quick quote, or email us if that’s easier. Tell us about the joints that need doing and we will talk you through the work.

Get a quick quote

Related advice

Questions from Nunhead

Is parking an issue for fire rated sealant in Nunhead?

London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.

Do you work for landlords with property near Nunhead station?

Yes, rental work is part of what we do. Just phone 0345 464 0079 or email us and tell us about the property, and we will give you a clear price.

Do you come to Nunhead?

Yes. We cover Nunhead, as part of our work across South East England, London and Scotland. For a quote, call 0345 464 0079 or send us an email.

Can you match the sealant colour?

We help you choose a colour that suits. The product needed can limit the range.

What do you put in the joint?

Each joint gets the product that suits it. Movement, water and weather all affect the choice, and we’ll tell you what we are using.

Can you quote for more than one area?

Yes, we can. More than one area can be quoted together.

Do you provide details of the products used?

Yes. We record the locations we have sealed and the products used to keep with your fire safety documents.

Can you work in occupied buildings?

Yes. Flats, HMOs, offices, schools and other occupied buildings are all part of our work. We agree access and the order of work with you first.

Work for landlords, hotels and businesses

We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements.

Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.

What fire rated sealant looks like in Nunhead

Workplaces and the common parts of blocks of flats in England need a fire risk assessment under the Regulatory Reform (Fire Safety) Order 2005, which is often where open fire-stopping gaps are first noticed. We work to the specification you’re given, installing the product to its tested details. Many London buildings have tight access and loading restrictions, so out-of-hours working can be arranged where needed.

For buildings such as Saint Antony with Saint Silas, service openings in its walls need the right fire-rated sealant, as in any building. For site and facilities teams at buildings such as Ivydale Primary School, fire-stopping around service openings should be restored whenever new services go in.

Nunhead is about 1 mile south-west of New Cross, in Greater London. Homes, rented property, offices and hotels in Nunhead can book us for fire rated sealant. The work is guaranteed for a year. Our Greater London coverage runs to 764 places, Nunhead among them.

Here we cover the SE15, SE4 and SE14 postcode area for fire rated sealant. Local streets include Rye Road, Nash Road and Kitto Road, all of which we cover. We also cover the places around Nunhead: Telegraph Hill (1 mile north-east), Honor Oak (1 mile south), Peckham (1 mile north-west), New Cross (1 mile north-east) and Brockley (1 mile south-east). Further out, we also cover London (3 miles north-west), City of Westminster (6 miles north-west), Marylebone (6 miles north-west), Kensington (7 miles west), St Pancras (5 miles north-west) and Shoreditch (5 miles north).

Around Nunhead

Typical jobs here are in homes near The Ivy House, Peckham Rye and Allenby Tutorial Trust, among other places. There’s a railway station in Nunhead itself: Nunhead station. A little further out are Greenwich Castle (2.4 miles north-east) and Lewisham Shopping Centre (1.7 miles east). Not far away are Knight's Hill and One Tree Hill.

Map of Nunhead © OpenStreetMap contributors

Signs you need fire rated sealant in Nunhead

Buildings are refitted and reconfigured over the years. A house turned into flats or an HMO, or an office split into smaller units, brings new walls, new service routes and new gaps.

These are the problems we are asked about most:

  • Cracked or shrunken fire-rated sealant
  • Gaps around pipes and cables through fire-resisting walls
  • Joints picked up in a fire-stopping survey
  • Open gaps behind door architraves

Rented homes near Nunhead station change hands often, and fire-rated sealant around pipes and cables through walls and floors needs making good whenever new services go through.

Before you book anyone

  • Whether all the old sealant comes out first
  • Which colour the sealant will be
  • What guarantee comes with the work
  • What product goes in the joint

How to choose a mastic man

How we quote for fire rated sealant

We quote each job individually. These are the things that affect it:

  • Whether old sealant or filler has to be cut out
  • Mould in or behind the old joints
  • The amount of work
  • Access and height

Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. We take all of that into account in your quote.

Helping us quote

To help us quote quickly, let us know:

  • Where the job is, and your postcode
  • Whether it’s a home or a business
  • The problem you’ve noticed
  • How we’d reach the joints

Asking for a quote is easy: tell us what needs doing and where, and roughly how big it is. Photos by email help us understand the job, and we will come back to you with a quote.

Surface by surface

Flats and HMOs

In occupied buildings, we plan the order of work with you. Access to flats and common areas is agreed in advance.

Masonry and concrete

Core-drilled and broken-out holes in concrete are often irregular. We measure the gap at its widest point to make sure it suits the product.

20+ yearsMastic and sealant specialists
ARBOMaster approvedApproved applicator for Arbo sealants
Fully insuredDomestic, commercial and hotels
One-year guaranteeOn every job