Hertfordshire · England
Cheshunt Fire Rated Sealant
Intumescent and fire-rated sealant around gaps, frames and service penetrations for Cheshunt, backed by a 12-month guarantee. Ask us for a quote.
- Gaps flagged on a fire risk assessment
- Standard silicone or caulk in a fire-stopping gap
- Cracked or shrunken fire-rated sealant
About our fire rated sealant in Cheshunt
Deciding which gaps need fire stopping is not our role; your assessor, designer or building control sets that out. Our part is applying the specified sealant carefully, to the right depth and with the right backing. We work on flats & HMOs, linear gaps and plasterboard & masonry, and the jobs we see most are open holes round services passing through fire walls and open gaps behind door architraves.
Washrooms in busy buildings wear their sealant out faster than a bathroom at home, while fire-rated sealant has to be made good whenever new pipes or cables go through. In Cheshunt, timings are planned around the building.
A 12-month guarantee comes as standard, so you’re not left on your own once the job is done.
- Where
- Cheshunt (EN7, EN8)
- Wider area
- Hertfordshire
- Cover
- A year, on every job
- Price
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What we can’t put right
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- Certifying a building or signing off its fire safety
- Construction that does not provide fire resistance on its own
- Doors that are not fire doors in the first place
If in doubt, phone 0345 464 0079 or email us and we’ll say what we think.
Joints and surfaces we work on
- Service penetrations
- Plasterboard & masonry
- Flats & HMOs
- Linear gaps
- Pipe & cable gaps
- Door frames
How it works
A visit follows a simple pattern: we look at the joints together, protect the area around them, carry out the job and tidy away. It usually takes anything from a few hours to several days, depending on how many gaps there are. Parking in a town like Cheshunt is usually straightforward, but tell us if there’s a driveway or any restrictions, and mention if the work is upstairs, in a flat or high on the outside.
- Before starting, we go through the specification or action list with you.
- We measure every gap and note what it’s in and what passes through.
- Unsuitable material such as ordinary foam or silicone is cut out and the gap cleaned.
- The specified fire-rated sealant goes in over any backing its detail requires.
- Every location is recorded with the product used for your records.
Before we arrive
- On commercial sites, let us know about site rules
- Let us know about stairs, lifts or work at height
- Clear items away from the joints we’re working on
How to get a quote
Getting a quote is simple: let us know the job and the location and its rough size. Photos by email help us understand the job, and we will take it from there.
Related advice
Cheshunt questions
Can you do fire rated sealant in Cheshunt?
Yes. Our work covers London and the South East, and Cheshunt 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 price.
I let a flat near Cheshunt station. Can you help?
Yes, we work for landlords and agents. Just call 0345 464 0079 or email us and tell us about the property, and we will send you a clear quote.
Where are you based?
Mr Mastic is based in Crawley. Our applicators cover Cheshunt, along with the rest of our area.
What fire rating will the seal have?
Ratings and certification sit with the product’s test evidence and whoever specified the work. We apply the specified product to the manufacturer’s details and giving you a record of where it went.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Can you tell me which gaps need fire stopping?
No. We work from the specification you give us, and apply each product to its tested details.
Can I do it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Landlord and commercial work in Cheshunt
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we’ll quote.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Leave it or put it right?
An open gap in a fire-resisting wall is a route for smoke and fire. Sealing it properly restores what the wall was there to do, and the sealing itself is often a contained piece of work. In Cheshunt, as anywhere, most leaks start as a small gap in a joint, and early is when they’re cheapest and quickest to sort.
What you pay reflects the work, not guesswork. That is why we ask about the job first.
What you get with us
- We leave the area clean and tidy
- Rated 4.9 stars on Google
- Arbo and Everbuild products
- We’re fully insured
DIY sealant or a professional job?
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 fails, we can still redo it.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Workplaces and buildings in Cheshunt
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 are given, installing the product to its tested details.
Managing a site like Andrews Lane Primary School? Then fire-stopping around service openings should be restored whenever new services go in. If you look after a church, hall or community building such as St Mary the Virgin, gaps around pipes and cables are worth checking after any building work there.
Cheshunt is about 14 miles north of City of Westminster, in Hertfordshire. Wherever you are in the EN7 postcode area, our applicators can take on fire rated sealant. 381 places in Hertfordshire are on our list, large and small. There’s also a page for London, about 15 miles away.
All of EN7 and EN8 is within our area for fire rated sealant, from the main roads to the quietest streets. If you need fire rated sealant at a property on Marlborough Square, High Street and Flamstead End Road or anywhere close by, we can help. Cheshunt sits on or near the A10 and B156. If you are just outside Cheshunt, we cover Churchgate (1 mile south), Turnford (1 mile north-east), Goff's Oak (2 miles west), Wormley (2 miles north-east) and Wormley West End (2 miles north). We also work in nearby towns such as Watford (15 miles west), Stevenage (15 miles north-west), St Albans (12 miles west), Bishop's Stortford (14 miles north-east), Welwyn Garden City (9 miles north-west) and Harpenden (15 miles north-west). Cheshunt is among the bigger towns we cover in Hertfordshire.
Landmarks near Cheshunt
Typical jobs here are in homes near Goffs-Churchgate Academy, The Green Dragon Public House and Goffs School and the streets around them. For rail, the closest station is Cheshunt station, about 1.3 miles south-east of the centre. Well-known places in the area include The National Speedway Museum (2.4 miles north) and St Michaels Hospital (3.7 miles south-west). The countryside around Cheshunt includes Lippitts Hill and Danemead.
How we quote for fire rated sealant
We don’t publish a price list. The quote depends on:
- Working hours on commercial sites
- How many rooms, windows or areas are involved
- The size of the job
- Any mould that needs treating
What it costs depends on the size of the job, how much old material has to come out and how easy the joints are to reach. We give a clear quote before any work starts, so you know where you stand.
What we need to know
Photos help, but a description is a good start. Try to tell us:
- Access, such as stairs, a lift or height
- Whether it has been sealed before
- The address or postcode of the job
- A few photos by email, if you can
Need a quote? Please phone 0345 464 0079 or send us an email with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Places near Cheshunt
What else we do in Cheshunt
Signs you need fire rated sealant in Cheshunt
Over time, buildings change layout and use. A house turned into flats or an HMO, or an office split into smaller units, brings new walls, new service routes and new gaps.
People usually contact us when they notice something like this:
- Joints picked up in a fire-stopping survey
- Gaps filled with a product that is not fire-rated
- Open joints along the top of partitions
- Holes left by a change of layout
If you let a flat or house near Cheshunt station, new cables or pipes through a fire-resisting wall leave a gap that needs the right sealant.
What your quote should include
- What happens if the job turns out different
- How the colour is chosen
- The length of the guarantee
- Is VAT in the price?