Greater London · England
Fire Rated Sealant in Coldblow
Fire rated sealant in Coldblow from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Seals cut through by electricians, plumbers or data installers
- New service routes left unsealed after building work
- Unsealed gaps where pipes and cables go through a wall
Different surfaces, different methods
Service penetrations
A copper pipe, a cable and a plastic pipe can all need different fire-stopping details. We follow the manufacturer’s tested detail for each and we flag any that need another system.
Door frames
We deal with the gap around the frame, not the door. Doors, seals and closers are for a door specialist.
Fire rated sealant in Coldblow, done properly
Ordinary silicone or decorators’ caulk in a fire-stopping gap is not a fire-rated seal. Anything unsuitable comes out first and the gap is resealed with a product tested for that use. We are often asked to deal with gaps around pipes and cables through fire-resisting walls and gaps filled with a product that isn’t fire-rated, across door frames, pipe & cable gaps and service penetrations.
London blocks of flats carry pipes and cables through walls and floors in their common parts and service risers. In Coldblow, building managers may need both fire-rated sealant around those openings and new sealant in shared washrooms.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we’ll put it right.
- Where
- Coldblow (DA5)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Price
- A clear price before we start
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
DIY versus a professional finish
A DIY attempt does not rule out a professional job. We cut it out and start again, so just mention it when you contact us.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
What sealant work cannot fix
To be straight with you, there are a few things sealant won’t fix:
- Deciding what fire stopping a building needs
- Openings too large for sealant, which need batts, boards or another system
- Fire doors that need new seals, closers or hardware
Not sure which it is? You can phone 0345 464 0079 or email us and we will tell you honestly before you book.
Surfaces we seal
- Pipe & cable gaps
- Plasterboard & masonry
- Service penetrations
- Door frames
- Flats & HMOs
- Linear gaps
Landlords, agents and businesses in Coldblow
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Coldblow questions
Can you help a landlord with a rental near Bexley station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we’ll give you a clear price.
Do you work for hotels and guest houses in Coldblow?
Yes, hotels and guest houses are among the places we work. Rooms can be done a few at a time, so the building stays open.
Are you ARBOMaster approved?
Yes. We are approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
Can I add another job to the visit?
Yes, and it often makes sense. Doing several areas at once is generally more efficient, so mention them when you ask for a quote.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice.
Does someone need to be in?
If the work is inside, we need someone to let us in. Once we’ve agreed the job, you do not need to watch us work.
How long does the job take?
As a guide, most jobs take anything from a few hours to several days, depending on how many gaps there are. Larger jobs naturally take longer, and we will tell you how long to expect.
Can you tell me how many minutes the seal will last?
We do not certify fire stopping or quote ratings. We apply the specified product to the manufacturer’s details and list the locations and products for you.
How it works
The work is kept neat and contained to the area we are working on, so you can carry on as normal. Expect the work to take from a few hours to a few days, depending on the number of gaps and the access. In Coldblow, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- Access to each area is agreed so the work can run in order.
- We take out any damaged or unsuitable sealant.
- Dust and loose debris are cleaned from each gap.
- The fire-rated or intumescent sealant is applied and tooled to the tested detail.
- We record what was done and flag anything that needs a different system.
Preparing for the visit
- Plan for the work area to be out of bounds to pets and children
- Clear the area around the work
- Tell us if parking is tricky
How to get a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and add photos by email if you can.
Read more
Nearby places to Coldblow
Also in Coldblow
Workplaces and buildings in Coldblow
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. Coldblow has hotels and guest accommodation in and around it. For hotels, a room-by-room programme keeps most rooms in use while the work goes on.
If you look after a building such as Maypole Primary School, service openings in fire-resisting walls need checking after any refurbishment. As a London address, Coldblow can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Coldblow is about 3 miles east of Sidcup, in Greater London. Coldblow gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Coldblow is one of 764 towns and villages in Greater London we cover for fire rated sealant. London is on our list too, around 12 miles away.
Work in DA5 is quoted and booked the same way as anywhere else. That includes homes and businesses on St Mary's Road, Dartford Road and Wansunt Road. Close by, we work in Joyden's Wood (1 mile south-east), Bowmans (1 mile east), North Cray (1 mile south-west), Crayford (1 mile north-east) and Wilmington (1 mile south-east). We also work in nearby towns such as London (12 miles west), City of Westminster (15 miles west), Marylebone (14 miles north-west), St Pancras (14 miles north-west), Shoreditch (12 miles north-west) and Walthamstow (13 miles north-west).
What’s near Coldblow
We work in homes and buildings around The Old Wick pub, St Columba's Catholic Boys' School and Braeburn Park, among other places. For rail, the closest station is Bexley station, about 0.6 miles west of the centre. Other landmarks nearby include Stone Castle (5 miles east) and Bexley Museum (0.7 miles north). Green spaces nearby include Wansunt Pit and Summer Hill.
When to call us in Coldblow
Gaps also open up as buildings move: cracked or debonded sealant leaves an open route through the wall. Knocks, maintenance and building work damage it further.
Most people get in touch after spotting something like this:
- Door frames with gaps between frame and wall
- Joints picked up in a fire-stopping survey
- Gaps filled with a product that isn’t fire-rated
- Seals cut through by electricians, plumbers or data installers
Rented homes near Bexley station change hands often, and new cables or pipes through a fire-resisting wall leave a gap that needs the right sealant.
Questions to ask before you book
- How the colour is chosen
- Who turns up on the day
- When the joint can take water or movement
- How hidden problems are handled
Why act early in Coldblow
Sealant isn’t the fix for every opening. Large holes, cable bundles and plastic pipes can call for batts, collars or wraps. If a gap is not suitable for sealant, we will tell you. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler.
What it costs depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. You will have a clear quote before any work starts.
Why choose Mr Mastic in Coldblow
- Old sealant always removed completely
- Sanitary silicone with an anti-fungal additive in wet areas
- ARBOMaster approved applicator
- Experience in homes, commercial sites and hotels
Read our cost guide or what customers say.