Hertfordshire · England
Chorleywood Fire Rated Sealant
Intumescent and fire-rated sealant around gaps, frames and service penetrations for homes and businesses in Chorleywood and across Hertfordshire. Fully insured, ARBOMaster approved and guaranteed for a year.
- Gaps where walls meet ceilings or slabs
- Gaps flagged on a fire risk assessment
- Open holes round services passing through fire walls
Fire rated sealant in Chorleywood
Deciding which gaps need fire stopping is not our role; that comes from your fire risk assessor, designer or building control. What we do is apply the right product to that specification, properly and neatly. Common call-outs are for gaps where walls meet ceilings or slabs and cracked or shrunken fire-rated sealant, on service penetrations, pipe & cable gaps and linear gaps.
Commercial work around a smaller place like Chorleywood normally means a pub, a shop, a school or small business units rather than office blocks. The work is the same as in a big building, just on a smaller scale.
Big or small, it’s backed by our 12-month guarantee in Chorleywood and across Hertfordshire.
- Where
- Chorleywood (WD3)
- Wider area
- Hertfordshire
- Cover
- One year on every job
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Honest limits
We will always be straight with you, so here’s what sealant can’t fix:
- Sign-off of the building, which sits with building control or your assessor
- Openings too large for sealant, which need batts, boards or another system
- Walls or floors that weren’t built to resist fire
If you are not sure, just phone 0345 464 0079 or drop us an email and we’ll give you a straight answer before you book.
Joints and surfaces we work on
- Door frames
- Flats & HMOs
- Service penetrations
- Linear gaps
- Plasterboard & masonry
- Pipe & cable gaps
When to call us in Chorleywood
Much fire stopping is hidden: in ceiling voids, service risers and behind boxing. Out of view, damage sits unnoticed until someone inspects.
These are the problems we’re asked about most:
- Damaged fire sealant left by other trades
- Cracked or shrunken fire-rated sealant
- Gaps around pipes and cables through fire-resisting walls
- New service routes left unsealed after building work
Community buildings like Christ Church are part of the picture too: gaps around pipes and cables are worth checking after any building work there.
Comparing quotes
- How the colour is chosen
- Which sealant they’ll use, and why
- What the cure time is
- Is the old sealant removed completely?
Commercial buildings in Chorleywood
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 apply fire-rated sealant to the assessor’s or designer’s specification and the product’s tested details.
Schools such as Christ Church Chorleywood CofE School are buildings too, and gaps opened by contractors for new cabling are a common finding in schools and offices. Letting a property close to Chorleywood station? Then new cables or pipes through a fire-resisting wall leave a gap that needs the right sealant.
Chorleywood is about 5 miles west of Watford, in Hertfordshire. Our applicators cover fire rated sealant for homes and businesses in Chorleywood and the surrounding area, as part of our work across Hertfordshire. Our area takes in 381 places across Hertfordshire, large and small. Our London page covers work nearby, about 20 miles away.
We cover every part of the WD3 postcode area for fire rated sealant and the streets around it. You will find streets such as South Cottage Drive, South Cottage Gardens and South Park Avenue, all of which we cover. Chorleywood sits on or near the A404, so getting to you is simple. Close by, we work in Heronsgate (1 mile south-west), Maple Cross (2 miles south), Chenies (2 miles north-west), Horn Hill (2 miles south-west) and West Hyde (3 miles south). We also work in nearby towns such as Watford (5 miles east), Hemel Hempstead (7 miles north), St Albans (10 miles north-east), Harpenden (13 miles north-east), Hatfield (14 miles north-east) and Borehamwood (10 miles east).
What’s near Chorleywood
We work in homes and buildings around St Clement Danes School, Rickmansworth Park and Black Horse Artichoke Dell pub. The closest station to Chorleywood is Chorleywood station, about 0.7 miles west. Nearby you will also find Harefield Hospital (3.2 miles south) and Chiltern Open Air Museum (2 miles south-west). For a walk, there’s Chorleywood Common and Tumbling Bay.
Chorleywood questions
Can you do fire rated sealant in Chorleywood?
Yes. Our work covers London and the South East, and Chorleywood is part of that. You can phone 0345 464 0079 or email us and tell us what needs doing, and we’ll give you a clear price.
I let a flat near Chorleywood station. Can you help?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before any work starts.
Is it messy?
Not at all. The area is protected while we work and cleaned up afterwards.
Do you guarantee your work?
Yes: twelve months. If anything is not right with the work within the year, let us know and we’ll sort it.
Can you tell me which gaps need fire stopping?
No, assessment is not something we do. When your assessor or designer has set out what’s needed, we can quote for the fire-rated sealant items.
Is standard sealant good enough for a fire gap?
No. It might close the gap, but it is not a fire-rated seal. Use a product tested for that gap and service.
What sealant do you use?
Products from Arbo and Everbuild, among others, picked for each joint. We explain the product when we quote.
Are you an approved applicator?
Yes. Mr Mastic is an ARBOMaster approved applicator.
Quotes for fire rated sealant in Chorleywood
Every job gets its own quote. This is what makes a difference:
- The number and length of the joints
- The old material and how stubborn it is
- How many rooms, windows or areas are involved
- Working hours on commercial sites
What it costs depends on the size of the job, how hard the old material is to remove and access to the work. We give a clear quote before we start.
Asking for a quote
When you call or email, these details help:
- How many joints, rooms or windows are involved
- A few photos by email, if you can
- Any previous sealing or DIY work
- If it’s domestic, commercial or a hotel
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. A few pictures by email make the job easier to understand, and we’ll come back to you with a quote.
Can I do it myself?
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.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
What happens on the day
On the day, we look over the joints with you first, so there are no surprises. Surfaces next to the work are protected before any work begins. Most jobs take anything from a few hours to several days, depending on how many gaps there are. Parking around Chorleywood is normally easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- We start with the survey or action list, checking the size and surfaces of every gap.
- Old or unsuitable sealant is cut out and the gap cleaned.
- Backing or fill is fitted where the product’s tested detail calls for it.
- The sealant goes in to the depth its detail sets, then it’s tooled off.
- Finally, we list where we worked and what we used, for your records.
Before we arrive
- Keep children and pets away from the work area
- Where the joints are inside, avoid wetting them before we arrive
- Mention any sign-in or site rules at work premises
Ask for a quote
For fire rated sealant in Chorleywood, call 0345 464 0079 or send us an email. Tell us what the problem is and where, and you will get a clear quote before any work starts.
Read more
Places near Chorleywood
Other services in Chorleywood
How to look after the new joints
So the new joints stay in good condition:
- Photograph sealed gaps before they’re covered up
- Store the list of sealed gaps with your building paperwork
- Don’t fill fire-stopping gaps with ordinary foam or silicone
- Plan fire stopping into any work that goes through walls or floors
File the record of locations and products with your fire safety paperwork. It saves time at the next inspection or assessment.
A gap left open in a fire-resisting wall or floor lets smoke spread in ways the building wasn’t designed for. Sealing it early is a simple step to take.
What happens if it’s left?
Fire-rated sealants need more care than everyday sealant. How it’s installed changes how it performs, so we follow the maker’s details on every gap. Around Chorleywood, water from a failed joint in an older home can soak into timber and plaster, which is far harder to put right than the sealant itself.
We don’t show prices on the website, because each job is priced on what it involves. For a quick quote, please phone 0345 464 0079 or drop us an email and we’ll talk you through it.
Why choose Mr Mastic in Chorleywood
- 180+ five-star Google reviews
- 20+ years of sealant experience
- Tidy, careful work
- Old sealant always removed completely
Read what affects the cost and what customers say.