Fire stopping in Crook Log
Sealant work in Crook Log for main contractors, managing agents and facilities managers: fire-rated and intumescent sealing of service penetrations and linear gaps, with a fixed quote first.
- Fire sealant pulled out of the opening
- Seals that don’t match their tested detail
- Fire-stopping items raised at inspection or handover
Fire stopping near Crook Log
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
About our fire stopping in Crook Log
Sealant is the specified answer for plenty of openings, such as metal pipes, cables and some small ducts where the detail covers them. 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. We work on small duct penetrations where the tested detail allows, cable penetrations and pipe penetrations, and what we’re called in for most is fire seals cut back for extra cables and never reinstated and seals that don’t match their tested detail. Most enquiries from Crook Log start with one failed joint and grow into a wider look at the building: we look at the rest while we are there and tell you what we find.
After a fit-out or new cabling in a London building, risers and ceiling voids are where open service gaps tend to be found. If sealant is the specified product we fit it to its tested detail, and if the detail needs something else, you will hear it from us.
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 spell out the cover before we begin.
- Place
- Crook Log (DA7, DA6, DA16)
- Region
- Greater London
- Cover
- 12 months on our workmanship
- Price
- A fixed quote before we start
- Phone
- 01277 525 020
- Last updated
- 3 November 2026
Common questions from Crook Log clients
Can you take on a job at a hospital such as Erith and District Hospital?
Yes, hospitals are one of the sectors we cover. Each area is agreed with the ward or department and the estates team in advance.
Do you work in occupied care homes around Crook Log?
Yes. We work around residents’ routines, a room or two at a time. Noise and disruption are kept to a minimum.
How much does the work cost?
Every job gets its own fixed quote. To get one, phone 01277 525 020 or send details through our quote form.
How do you choose the sealant?
A specification, where there is one, decides it. Without one, the joint decides: how much it moves, what it bonds to and whether it’s wet, trafficked or fire-rated.
How long does a typical visit take?
That varies with the scale of the job, but the work typically takes anything from one day to a planned run of visits, depending on the number of seals and the access. For bigger or phased jobs, we’ll set out a timescale with the quote.
Do the same rules apply to fire stopping in Scotland?
Our area runs from Greater London and the South East to every part of Scotland. Scotland’s non-domestic Technical Handbook, clause 2.1.14, expects service penetrations to be fire stopped to at least the wall or floor’s fire resistance.
Do you seal on top of existing sealant?
No. Failed sealant is removed and the faces cleaned back to sound, dry material first, since fresh sealant will not bond reliably to aged material.
Building owners, agents and FMs in Crook Log
As a CHAS accredited contractor and Constructionline member, we are straightforward to vet for your supplier list. We are fully insured, and our insurance certificate can go with the quote.
We take on planned maintenance as well as one-off repairs: resealing failed joints building by building, on a schedule that suits your budget. Crook Log can form part of a wider programme.
Why act early in Crook Log
An unsealed opening affects more than fire safety: smoke, noise and draughts pass through them every day. The specified fire seal closes the gap for all of these. In a London building, a failed joint rarely affects only one party. Dealing with it early is simpler for everyone.
No two sites price the same: joint size, product, access and site hours all play a part. Send the details and a fixed figure follows.
Why choose Mastic Doctor in Crook Log
- Fixed quotes based on photographs, drawings or a visit
- Commercial sealant work since 2005
- One number for every site we cover
- 12-month guarantee on workmanship
Take a look at what affects the cost and how we’re accredited.
Towns and villages near Crook Log
What else we do in Crook Log
Compartment walls and floors in Crook Log
With tenants changing and fit-outs following, London buildings see service routes altered again and again. We install fire-rated sealant where it is specified and work within the building manager’s permit system. A 2-mile radius around Crook Log takes in several hotels. A hotel refit often runs new services through compartment walls between bedrooms and corridors, and each opening needs the specified seal.
Office fit-outs on sites such as Old Bexley Business Park (1.6 miles south-east of Crook Log) add cabling and pipework through fire-resisting walls, and fire-rated sealant goes in where the specification calls for it. Residences at universities like University of Greenwich Avery Hill Campus, 2.3 miles to the south-west of Crook Log, have compartment walls that must be resealed whenever services change.
Crook Log is about 3 miles south-east of Plumstead, in Greater London. Looking for fire stopping in Crook Log? We can help, as we do across Greater London. Our Greater London coverage takes in 764 places, from busy centres to rural villages. We also cover London, around 10 miles from Crook Log.
Postcode districts covered here: DA7, DA6 and DA16 for service penetrations. For a building on Bean Road, Lion Road and Alers Road or nearby, we can quote for service penetrations. If your building is just outside Crook Log, we cover Upton (1 mile east), Bexleyheath (1 mile east), Welling (1 mile west), Blendon (1 mile south) and Bexley (1 mile south). Bigger towns within reach include London (10 miles west), City of Westminster (13 miles west), Marylebone (12 miles west), Kensington (14 miles west), St Pancras (11 miles north-west) and Shoreditch (10 miles north-west).
What’s near Crook Log
We work on buildings around Danson Park, St Columba's Catholic Boys' School and The Crook Log Public House and the streets around them. Crook Log has its own railway station: Bexleyheath station. Well-known places in the area include Bexley Museum (1.7 miles south-east) and Broadway Shopping Centre (0.9 miles east). Open spaces near Crook Log include Summer Hill and Wansunt Pit.
Our process
Working in a building that stays open takes some planning. We sign and contain the area we’re in, keep walkways clear and move on in phases so staff and visitors can carry on around us. Planning a London job such as one in Crook Log starts with access. Give us the hours we can be on site and we’ll schedule to suit.
- First we confirm the product and tested details named in the specification.
- We sort the openings by the detail each one needs.
- Old or wrong materials are cut out.
- Where the detail needs backing, it goes in at the stated depth.
- We gun the sealant in to the specified depth around each service and tool it.
- We walk the completed areas with you and confirm the records agreed at quote stage.
What we need from you
- Clear stock, furniture or equipment away from the joints
- Have the specification and drawings to hand
- Share the asbestos register for older buildings
Ask for a quote
Send details, get a quote, we seal, guaranteed: that’s how every job runs. The first step is to ring 01277 525 020 or email a schedule or drawings with what you know.
Read more
Common problems we fix in Crook Log
Physical damage is another reason seals stop doing their job. Maintenance work can knock a seal, cut it back for an extra cable or remove it with an old pipe and the opening isn’t always resealed.
Things that usually lead to an enquiry:
- Old intumescent sealant that has split away
- Hidden openings found during inspections
- Head-of-wall gaps with no fire seal
- Improvised or mixed-product fire seals
Large healthcare estates like Erith and District Hospital (2.1 miles north-east of Crook Log) change their services often, so penetration seals are worth checking after M&E work.
Questions to ask before you book
- The named product and why it was chosen
- Their plan for phasing and protecting the area
- Do they follow the manufacturer’s priming guidance?
- How they handle RAMS and site documents
When it isn’t the sealant
Before quoting, we check that sealant is the right answer. It isn’t the answer for:
- Openings that need collars, wraps, batts or boards rather than sealant
- Issuing fire ratings or certificates for seals
- Designing or specifying fire stopping, which sits with the designer or fire engineer
If in doubt, ring 01277 525 020 or use the quote form and we will say what we think.
Joints and surfaces we work on
- Linear gaps at wall heads
- Pipe penetrations
- Joints between fire-resisting walls and floors
- Cable penetrations
- Small duct penetrations where the tested detail allows
- Service gaps in risers
Different surfaces, different methods
Masonry and concrete
Many seals are made in blockwork, brickwork or concrete slabs. Dust and debris are cleared from the opening.
Risers and ceiling voids
Openings above suspended ceilings are easy to miss. We follow your schedule area by area.