Hertfordshire · England
Welwyn Fire Rated Sealant
Specialist fire rated sealant for Welwyn: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Old fire sealant that has split or come away
- Unsealed gaps where pipes and cables go through a wall
- Unsealed gaps around fire door frames
DIY versus a professional finish
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
How we handle fire rated sealant in Welwyn
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 follow the tested detail for each one. If you are dealing with unsealed gaps around fire door frames and unsealed gaps where pipes and cables go through a wall, we can help, whatever the surface.
If you run a pub, café, guest house or shop in or near Welwyn, its washrooms and kitchen need the same sealant care as any big building.
You are covered for a year from the day we finish. If anything isn’t right with it, call 0345 464 0079 or send us an email.
- Where
- Welwyn (AL6)
- Wider area
- Hertfordshire
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Work for landlords, hotels and businesses
For anyone letting property in or around Welwyn, several properties can be quoted together. Send us the addresses and the work at each, and pictures by email help.
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Fire rated sealant in Welwyn: local notes
In England, the Regulatory Reform (Fire Safety) Order 2005 requires a fire risk assessment for workplaces and for the common parts of blocks of flats, and gaps around services are often picked up there. We work to the specification you’re given, installing the product to its tested details.
If you let a flat or house near Welwyn North station, new cables or pipes through a fire-resisting wall leave a gap that needs the right sealant. Community buildings like Parish Church of St Mary are part of the picture too: service openings in its walls need the right fire-rated sealant, as in any building.
Welwyn is about 2 miles north-west of Welwyn Garden City, in Hertfordshire. We provide fire rated sealant to homes and businesses in Welwyn and nearby, as part of our work across Hertfordshire. We cover 381 towns and villages across Hertfordshire, from the larger towns to small villages. London is on our list too, around 23 miles away.
We cover every part of AL6 for fire rated sealant and the streets around it. If you need fire rated sealant at a property on High Street, London Road and Mimram Place or anywhere close by, we can help. If you’re just outside Welwyn, we cover Monkswood (1 mile south-east), Ayot St Peter (1 mile south-west), Ayot Green (1 mile south-west), Pottersheath (2 miles north) and Codicote (2 miles north-west). Larger places within reach include Watford (14 miles south-west), Hemel Hempstead (12 miles south-west), Stevenage (6 miles north), St Albans (7 miles south-west), Harpenden (6 miles west) and Hitchin (9 miles north).
Near you in Welwyn
Typical jobs here are in homes near Stable Door pub, Danesbury Park and Homerswood Primary and Nursery School. The nearest railway station is Welwyn North station, roughly 1.1 miles south-east. Nearby you will also find Queen Elizabeth II Hospital (3.5 miles south) and Datchworth Museum (2.7 miles north-east). The countryside around Welwyn includes Mardley Heath.
Leave it or put it right?
Paying for fire stopping that has to be redone is a false economy. Work that doesn’t follow the tested detail may have to come out again when the building is next checked. In an older home around Welwyn, damp from a failed joint can get into timber and plaster, which is far harder to put right than the sealant itself.
The cost reflects the work involved, not guesswork. That is why we ask about the job first.
What you get with us
- One-year guarantee on every job
- More than 20 years in sealant work
- We leave the area clean and tidy
- Experience in homes, commercial sites and hotels
Take a look at what affects the cost and customer reviews.
Nearby places to Welwyn
Other services in Welwyn
FAQs for Welwyn
Do you cover Welwyn for fire rated sealant?
Yes. We work across London and the South East, and Welwyn is part of that. Just call 0345 464 0079 or send us an email with a few details of the job.
Do you cover smaller places like Welwyn?
Yes. Welwyn is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
I’m a tenant. Can you help?
We’re happy to deal with the tenant, landlord or agent. Just make sure your landlord agrees.
What information do you need?
Just the basics: where it is, what you’ve noticed and how we reach it. Then ring 0345 464 0079 or send us an email.
Can ordinary silicone be used in a fire-stopping gap?
No. It looks sealed but will not perform as fire stopping. Use a product tested for that gap and service.
What does intumescent mean?
An intumescent material expands when it’s heated. Many fire-rated sealants work this way, but not all.
How long does fire rated sealant take?
A typical job takes anything from a few hours to several days, depending on how many gaps there are, including preparation and clearing up. Your quote will say how long we expect yours to take.
What fire rating will the seal have?
Ratings and certificates are not something we issue. The performance comes from the product’s tested details and the specification from your assessor or designer; we install to those details and record what we did.
What sealant work can’t fix
We won’t take on work that will not last, so here’s what sealant cannot put right:
- Fire doors that need new seals, closers or hardware
- Certifying a building or signing off its fire safety
- Walls or floors that weren’t built to resist fire
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we will tell you honestly.
Joints and surfaces we work on
- Flats & HMOs
- Linear gaps
- Door frames
- Plasterboard & masonry
- Service penetrations
- Pipe & cable gaps
When to call us in Welwyn
If the sealant is too shallow, has the wrong backing or sits on a dusty surface, it is not installed as tested. Rushed fire stopping is common.
Common reasons people contact us are:
- Gaps where walls meet ceilings or slabs
- Gaps flagged on a fire risk assessment
- Fire stopping disturbed by later work
- New service routes left unsealed after building work
Managing a site like Monk's Walk School? Then gaps opened by contractors for new cabling are a common finding in schools and offices.
What to look for in a quote
- Are they insured?
- Which colour the sealant will be
- What product goes in the joint
- How hidden problems are handled
The process
There’s no need to move everything out, only the area right around the joints. Everything nearby is protected, and the job takes anything from a few hours to several days, depending on how many gaps there are in most cases. A visit to Welwyn is planned like any other: the time, the access and where to park are agreed in advance. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We go through the gaps on your list or survey and check each one’s size and substrate.
- Anything that isn’t fit for the job comes out, and the gap is cleaned.
- We put in whatever backing or fill the product detail specifies.
- Fire-rated or intumescent sealant is applied to the right depth and tooled.
- We record the locations and products used for your records.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- Let us know about earlier repairs to the joints
- Let us know about stairs, lifts or work at height
Ask for a quote
If you’re in Welwyn and need fire rated sealant, call 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before any work starts.
Related advice
What affects the quote in Welwyn
We don’t publish a price list, because no two jobs are the same. What we look at:
- Working hours on commercial sites
- How much there is to do
- How many areas need sealing
- How much old sealant there is and how hard it is to remove
We don’t show prices on the website, because each job is priced on what it involves. For a quick quote, please call 0345 464 0079 or send us an email.
Helping us quote
Before you ask for a quote, have a think about:
- What the problem is, such as mould, gaps, leaks or cracking
- The address or postcode of the job
- How we’d reach the joints
- Whether it has been sealed before
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. Whenever you are ready, phone 0345 464 0079 or email us.