Greater London · England
Fire Rated Sealant in The Wrythe
Fire-stopping gaps in The Wrythe need attention? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Damaged fire sealant left by other trades
- Cracked or shrunken fire-rated sealant
- Open holes round services passing through fire walls
Can I do it myself?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
How we handle fire rated sealant in The Wrythe
Intumescent sealant looks much like any other sealant until it gets hot; then it swells to help close the gap. The right product depends on the gap size, the substrate and what passes through, so we work to the manufacturer’s details. If you are dealing with open holes round services passing through fire walls and linear gaps at the head of walls, we can help, on door frames, plasterboard & masonry and service penetrations alike.
Across London, offices, shops, hotels, student halls and blocks of flats all need sealant work from time to time, whether that’s washroom resealing or fire-rated sealant around service openings. Where a building in The Wrythe needs to stay open, work can be planned outside normal hours.
All our work is covered by our 12-month guarantee, wherever you are in Greater London.
- Where
- The Wrythe (SM5, SM6, SM1)
- Region
- Greater London
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Why act early in The Wrythe
Squirting in whichever sealant is nearest does not make a fire seal. Fire-rated products are tested in set gap sizes, depths and substrates, which is why we match the product and the method to each gap. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
What it costs depends on the amount of work, how much old material has to come out and how easy the joints are to reach. We give a clear quote before work begins, so you know where you stand.
Why book with us
- Fully insured
- Over 20 years’ experience
- Every job guaranteed for a year
- ARBOMaster approved applicator
What the job involves on each surface
Service penetrations
New gaps tend to show up where services have been added. We clean out what’s there and reseal to the right depth with backing where the detail needs it.
Masonry and concrete
Core-drilled and broken-out holes in concrete are often irregular. We check the gap size around the service against the product’s tested range.
Towns and villages near The Wrythe
Also in The Wrythe
Fire rated sealant in The Wrythe: local notes
Workplaces and the common parts of blocks of flats in England need a fire risk assessment under the Regulatory Reform (Fire Safety) Order 2005, and gaps around services are often picked up there. We work to the specification you are given, installing the product to its tested details. Commercial buildings in London often have strict access rules and limited loading, and out-of-hours working is possible to arrange.
If you look after a building such as Victor Seymour Infants' School, gaps opened by contractors for new cabling are a common finding in schools and offices. For landlords with property near Carshalton station, fire-rated sealant around pipes and cables through walls and floors needs making good whenever new services go through. For buildings such as Bishop Andrewes Church, gaps around pipes and cables are worth checking after any building work there.
The Wrythe is about 7 miles south of Stockwell, in Greater London. The Wrythe gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. We cover 764 towns and villages across Greater London. You can also see our page for London, about 9 miles away.
Postcode districts we cover here for fire rated sealant: SM5, SM6 and SM1. That includes homes and businesses on Elm Road, Byne Road and Mill Lane and the roads around them. We also cover the places around The Wrythe: Carshalton (1 mile south), Wallington (1 mile south-east), Rosehill (1 mile north-west), St Helier (1 mile north-west) and Benhilton (1 mile west). Within a short drive, we also cover London (9 miles north), City of Westminster (10 miles north), Marylebone (10 miles north), Kensington (9 miles north), St Pancras (11 miles north) and Shoreditch (11 miles north).
Near you in The Wrythe
Locally, jobs take us to homes and businesses close to Carshalton Park, The Railway Tavern and Carshalton High School for Girls and the streets around them. There’s a railway station in The Wrythe itself: Carshalton station. A little further out are Centrale Croydon (2.7 miles east) and Honeywood Museum (0.6 miles south). The countryside around The Wrythe includes The Spinney Local Nature Reserve and Duppas Hill.
The Wrythe questions
Do you cover The Wrythe for fire rated sealant?
Yes. Our work covers London and the South East, and The Wrythe is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear quote.
Can parking be tricky for a visit in The Wrythe?
Parking in The Wrythe, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly.
Will you leave a mess?
We keep the work tidy. We protect what’s around the joints, and the area is left clean when we finish.
What’s the difference between intumescent and fire-rated sealant?
Intumescent means it swells when heated to help seal the gap. Intumescent sealants are one kind of fire-rated sealant; the right one depends on the gap and what passes through it.
Does someone need to be in?
That depends on where the joints are. For work indoors, someone needs to let us in, and for outside work we’ll agree access with you when we book.
Do you take on fire stopping in schools and offices?
Yes. We work in flats, HMOs, schools, offices and other commercial buildings, including occupied ones. The order of work and access are planned with you.
Where do you work from?
Mr Mastic is based in Crawley. We cover The Wrythe and the rest of Greater London.
What does fire rated sealant cost?
Every job is different, so each one gets its own quote. For a quick quote, phone 0345 464 0079 or send us an email and tell us what needs doing and where.
Aftercare tips
Joint life depends on how it’s used and looked after. We suggest:
- Ask which product was used before you paint
- Allow for resealing whenever new services are run
- Don’t fill fire-stopping gaps with ordinary foam or silicone
- Ask every contractor to reseal any fire stopping they disturb
Tell other trades that the gaps have been sealed, and make sure anything they disturb is resealed with a suitable product. Later work is a common cause of damaged fire stopping.
Leave a fire-stopping gap open and smoke can move through the building much more easily. Sealing it early is a simple step to take.
Landlords, agents and businesses in The Wrythe
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
In hotels, rooms out of use cost money, so the work can be planned room by room. We’ve worked in hotels as well as homes and businesses.
How it works
When we arrive, we start by going over the job with you, so you know exactly what we are doing. We protect the surfaces around the joints before any work begins. The work normally takes a few hours for a handful of gaps, and longer for a whole building. In The Wrythe, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- We begin by agreeing the list of gaps from your assessor’s or designer’s requirements.
- Each gap is measured and its substrate and service noted.
- Any non-fire-rated filler is removed and the gap cleaned.
- The specified fire-rated sealant goes in over any backing its detail requires.
- We hand over a list of locations and products for your records.
Preparing for the visit
- Mention any sign-in or site rules at work premises
- Let us know about earlier repairs to the joints
- Tell us if parking is tricky
How to get a quote
It all starts with a short chat. Describe the problem, the location and the size of the job. When it suits you, phone 0345 464 0079 or drop us an email.
Related advice
What affects the quote in The Wrythe
The quote reflects the job in front of us. We take into account:
- Whether there’s mould to deal with
- How easy the joints are to reach
- The type of sealant required
- Whether old sealant or filler has to be cut out
A few things move the cost up or down: the old material and how easily it comes out, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
What we need to know
When you contact us, these details help:
- The problem you’ve noticed
- The type of property
- How we’d reach the joints
- Pictures of the joints, sent by email
Asking for a quote is easy: let us know what needs doing and where, and roughly how big it is. A few photos by email make the job easier to understand, and we will take it from there.